| THIS IS A POSTSCRIPT FILE IDIOTS GUIDE TO LAT.I HOPE ANYONE WHO
WANTS TO READ IT FINDS IT USEFUL.SINCE THE FILE IS IN POSTSCRIPT,PLEASE
EXTRACT THE FILE & GET IT PRINTED ON A POSTSCRIPT PRINTER
KEVIN MORIARTY
===================================================================
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5991 X(create)S 184 x(services)S 185 x(on)S 184 x(our)S 185 x(node)S
184 x(\(LCP)S 184 x(CREA)S -29 x(TE)S 184 x(SER)S -19 x(VICE\).)S
183 x(The)S 185 x(Node)S 184 x(name)S 598 y 5991 X(will,)S 177 x(by)S
175 x(default,)S 178 x(be)S 175 x(the)S 175 x(same)S 174 x(as)S 175 x
(SYS$NOD)S -2 x(E,)S 175 x(the)S 175 x(same)S 175 x(as)S 174 x(the)S
176 x(DEC)S -2 x(NET)S 598 y 5991 X(node)S 185 x(name.)S 278 x(Each)S
185 x(V)S -46 x(ax)S 185 x(on)S 185 x(the)S 185 x(ethernet)S 185 x
(must)S 185 x(have)S 185 x(a)S 185 x(unique)S 185 x(node)S 186 x
(name,)S 597 y 5991 X(and)S 188 x(since)S 188 x(the)S 187 x(DECNET)S
186 x(name)S 188 x(is)S 187 x(already)S 188 x(unique,)S 195 x(we)S
187 x(will)S 187 x(use)S 187 x(that.)S 287 x(The)S 598 y 5991 X
(service\(s\))S 184 x(we)S 184 x(create)S 184 x(on)S 185 x(this)S
183 x(vax)S 185 x(will)S 184 x(be)S 184 x(announced)S 185 x(to)S
184 x(all)S 184 x(servers)S 185 x(on)S 184 x(the)S 598 y 5991 X
(Ethernet)S 152 x(via)S 152 x(a)S 151 x("Multicast")S 151 x(message)S
151 x(which,)S 156 x(by)S 152 x(default,)S 154 x(is)S 151 x(sent)S
152 x(once)S 152 x(every)S 598 y 5991 X(60)S 141 x(seconds.)S 214 x
(This)S 141 x(message)S 141 x(contains)S 141 x(the)S 142 x(node)S
141 x(name,)S 147 x(the)S 142 x(service\(s\))S 141 x(offered,)S 597 y
5991 X(and)S 129 x(the)S 129 x(Rating)S 129 x(of)S 129 x(that)S 129 x
(service.)S 210 x(The)S 129 x(service)S 130 x(Rating)S 129 x(is)S
128 x(a)S 129 x(number)S 130 x(between)S 128 x(0)S 598 y 5991 X(and)S
154 x(255)S 154 x(which)S 154 x(can)S 154 x(vary)S 155 x(depending)S
155 x(on)S 154 x(CPU)S 154 x(type,)S 157 x(the)S 154 x(amount)S 154 x
(of)S 154 x(memory)S 598 y 5991 X(on)S 256 x(the)S 255 x(system,)S
278 x(percentage)S 257 x(of)S 255 x(null)S 256 x(time,)S 278 x
(number)S 256 x(of)S 255 x(CPU')S -19 x(s)S 255 x(active)S 256 x
(\(for)S 598 y 5991 X(multiprocessors)S 164 x(i.e.;)S 166 x(8840,)S
165 x(6220\))S 164 x(and)S 165 x(number)S 165 x(of)S 164 x
(interactive)S 165 x(users)S 164 x(on)S 165 x(the)S 598 y 5991 X
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5991 X(A)S 201 x(Node)S 200 x(can)S 202 x(offer)S 201 x(up)S 201 x
(to)S 201 x(8)S 201 x(services.)S 326 x(This)S 201 x(is)S 201 x
(primarily)S 201 x(used)S 201 x(in)S 201 x(a)S 201 x(Cluster)S 598 y
5991 X(Environment,)S 244 x(where)S 227 x(a)S 227 x(user)S 227 x
(can)S 228 x(access)S 227 x(the)S 227 x(same)S 226 x(data)S 227 x
(disks)S 226 x(from)S 227 x(any)S 597 y 5991 X(node)S 159 x(in)S
160 x(the)S 159 x(cluster)S -37 x(,)S 161 x(and)S 159 x(wants)S 159 x
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(the)S 190 x(cluster)S 189 x(would)S 189 x(offer)S 189 x(2)S 189 x
(services;)S 202 x(one)S 189 x(called)S 598 y 5991 X("CLUSTER",)S
124 x(and)S 114 x(one)S 114 x(which)S 115 x(was)S 113 x(the)S 114 x
(same)S 113 x(as)S 114 x(the)S 114 x(vax')S -18 x(s)S 114 x(Node)S
114 x(Name.)S 204 x(Thus,)S 598 y 5991 X(Node)S 149 x("V)S -56 x
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(V)S -56 x(AXB)S 597 y 5991 X(would)S 225 x(offer)S 225 x(services)S
226 x("CLUSTER")S 224 x(and)S 226 x("V)S -56 x(AXB")S -2 x(,)S 241 x
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(offer)S 166 x(services)S 166 x("CLUSTER")S 165 x(and)S 166 x("V)S
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(=============================================================)S
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598 y 5991 X(backbone,)S 259 x(we)S 239 x(would)S 239 x(see)S 239 x
(these)S 239 x(messages)S 238 x(coming)S 241 x(from)S 239 x(each)S
239 x(V)S -46 x(ax)S 240 x(every)S 597 y 5991 X(minute)S 183 x(or)S
183 x(so,)S 187 x(and)S 183 x(they)S 183 x(would)S 183 x(look)S 183 x
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234 x(rating)S 235 x(of)S 234 x(25)S 234 x(and)S 234 x(service)S
234 x("CLUSTER")S 598 y 5991 X(at)S 224 x(a)S 224 x(rating)S 224 x
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(two)S 223 x(or)S 224 x(more)S 224 x(services)S 224 x(on)S 225 x
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(the)S 218 x(same,)S 230 x(unless)S 218 x(one)S 218 x(or)S 217 x
(more)S 218 x(of)S 217 x(the)S 218 x(services)S 218 x(is)S 217 x
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199 x("Create)S 598 y 5991 X(service")S 194 x(command)S 195 x(in)S
194 x(LA)S -28 x(T/VMS)S 195 x(mgmt.)S 305 x(guide\).)S 307 x(The)S
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210 x(Ethernet)S 210 x(listen)S 209 x(to)S 210 x(this)S 209 x
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(what)S 236 x(Services)S 238 x(are)S 237 x(offered)S 237 x(on)S 237 x
(which)S 237 x(nodes,)S 255 x(and)S 238 x(what)S 236 x(the)S 597 y
5991 X(ratings)S 221 x(for)S 220 x(the)S 221 x(service)S 221 x(are.)S
385 x(The)S 221 x(next)S 221 x(time)S 220 x(a)S 221 x(user)S 220 x
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159 x(whichever)S 160 x(node)S 159 x(offers)S 159 x(the)S 159 x
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179 x(connection)S 179 x(to)S 178 x("cluster")S 177 x(will)S 598 y
5991 X(be)S 188 x(connected)S 189 x(to)S 188 x(V)S -55 x(AXC.)S 187 x
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27570 Y 5991 X(If)S 230 x(you've)S 231 x(been)S 231 x(reading)S 232 x
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247 x(go)S 230 x(get)S 231 x(a)S 231 x(cup)S 230 x(of)S 598 y 5991 X
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29901 Y 18152 X F152(LA)S -37 x(T)S 167 x(Overvi)S -2 x(ew)S 498 x
(1)S
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4104 Y 4796 X F24(1.3)S 348 x(The)S 232 x(LA)S -52 x(T)S 233 x
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(protocol)S 234 x(is)S 234 x(divided)S 234 x(into)S 234 x(two)S 233 x
(layers,)S 252 x(the)S 234 x(VIRTUAL)S 233 x(CIRC)S -2 x(UIT)S 598 y
5991 X(layer)S 167 x(and)S 166 x(the)S 166 x(SLOT)S 166 x(LA)S -46 x
(YER.)S 7989 Y 4796 X F24(1.4)S 348 x(The)S 232 x(V)S -12 x(irtual)S
232 x(Circuit)S 232 x(layer)S 9782 Y 5991 X F151(The)S 157 x(V)S
-22 x(irtual)S 157 x(Circuit)S 156 x(establishes)S 156 x(and)S 157 x
(maintains)S 156 x(an)S 157 x(error)S 157 x(free)S 157 x(communica-)S
598 y 5991 X(tions)S 192 x(path)S 192 x(\(the)S 192 x(virtual)S 193 x
(circuit)S
(\))S 193 x(between)S 192 x(two)S 191 x(nodes)S 193 x(\(typically)S
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598 y 5991 X(even)S 167 x(for)S 166 x(Host-)S 166 x(Initiated)S 165 x
(Connections)S 166 x(\(See)S 166 x(Chapter)S 166 x(5)S 166 x(for)S
166 x(more)S 167 x(info\).)S 13967 Y 5991 X(When)S 139 x(a)S 137 x
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(a)S 182 x(VIRTUAL)S 180 x(CIRCUIT)S 180 x(to)S 181 x(that)S 181 x
(node.)S 598 y 5991 X(In)S 171 x(the)S 171 x(event)S 172 x(that)S
171 x(someone)S 171 x(else)S 171 x(on)S 171 x(the)S 171 x(same)S
171 x(server)S 171 x(is)S 171 x(already)S 171 x(connec)S 2 x(ted)S
598 y 5991 X(to)S 173 x(that)S 173 x(node,)S 176 x(then)S 173 x
(there)S 174 x(will)S 172 x(already)S 174 x(be)S 173 x(a)S 173 x(V)S
-65 x(.C.)S 174 x(established)S 172 x(to)S 173 x(that)S 173 x(node,)S
597 y 5991 X(and)S 166 x(the)S 167 x(new)S 166 x(user)S 27 x(')S
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198 x(describing)S 198 x(what)S 196 x(sessions)S 597 y 5991 X(are)S
154 x(connected)S 155 x(to)S 154 x(which)S 154 x(nodes.)S 218 x(For)S
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(site\),)S 207 x(then)S 200 x(the)S 199 x(DECserver)S 199 x(will)S
198 x(have)S 597 y 5991 X(a)S 246 x(possible)S 244 x(maximum)S 246 x
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241 x(my)S 241 x(one)S 241 x(port,)S 260 x(and)S 241 x(there)S 598 y
5991 X(would)S 167 x(be)S 167 x(3)S 167 x(virtual)S 167 x(circuits)S
167 x(established)S 166 x(on)S 168 x(this)S 166 x(DECserver)S -37 x
(.)S 224 x(If)S 167 x(I)S 167 x(again)S 167 x(hit)S 598 y 5991 X
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148 x(new)S 148 x(V)S -64 x(.C.)S 148 x(would)S 148 x(NOT)S 29901 Y
4796 X F152(1\2036)S 498 x(LA)S -37 x(T)S 166 x(Overview)S
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3969 Y 5991 X F151(be)S 139 x(created-)S 140 x(my)S 139 x(second)S
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(off)S 179 x(messages)S 178 x(between)S 179 x(server)S 180 x(and)S
179 x(V)S -46 x(ax,)S 184 x(until)S 179 x(the)S 598 y 5991 X(LAST)S
141 x(user)S 142 x(with)S 141 x(a)S 141 x(session)S 141 x(to)S 141 x
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598 y 5991 X(Likewise,)S 155 x(if)S 153 x(the)S 152 x(V)S -46 x(ax)S
153 x(crashes,)S 155 x(or)S 153 x(is)S 152 x(shut)S 152 x(down,)S
156 x(all)S 152 x(V)S -22 x(irtual)S 152 x(Circuits)S 152 x(to)S
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157 x(there)S 157 x(is)S 156 x(another)S 158 x(V)S -47 x(ax)S 157 x
(offering)S 598 y 5991 X(that)S 156 x(service)S 157 x(\(as)S 155 x
(is)S 156 x(the)S 156 x(case)S 156 x(with)S 155 x("CLUSTER",)S 158 x
(above\))S 156 x(the)S 156 x(DECserver)S 156 x(will)S 598 y 5991 X
(attempt)S 175 x(to)S 175 x(connect)S 177 x(the)S 176 x(user)S 176 x
(to)S 175 x(one)S 176 x(of)S 176 x(the)S 176 x(remaining)S 176 x(V)S
-46 x(axen)S 177 x(which)S 176 x(offers)S 598 y 5991 X(that)S 166 x
(service.)S 12338 Y 5991 X(In)S 215 x(order)S 215 x(to)S 215 x
(understand)S 215 x(the)S 215 x(how)S 215 x(the)S 215 x(DECs)S -2 x
(ervers)S 216 x(talk)S 214 x(to)S 215 x(a)S 215 x(V)S -46 x(ax)S
215 x(system)S 598 y 5991 X(runnin)S 2 x(g)S 247 x(LA)S -27 x(T)S
-46 x(,)S 248 x(we)S 247 x(\211rst)S 247 x(need)S 248 x(to)S 247 x
(take)S 247 x(a)S 247 x(look)S 248 x(at)S 247 x(how)S 247 x(any)S
248 x(two)S 247 x(nodes)S 247 x(on)S 597 y 5991 X(Ethernet)S 165 x
(exch)S 2 x(ange)S 166 x(messages.)S 221 x(Let')S -19 x(s)S 165 x
(take)S 165 x(a)S 165 x(look)S 166 x(at)S 165 x(a)S 165 x(typical)S
166 x(data)S 164 x(packet,)S 598 y 5991 X(as)S 205 x(it)S 205 x
(makes)S 205 x(its)S 205 x(way)S 205 x(happily)S 205 x(along)S 207 x
(the)S 205 x(backbone,)S 216 x(unaware)S 206 x(that)S 205 x(we)S
205 x(are)S 598 y 5991 X(watching)S 167 x(it.)S 15925 Y 5991 X F36
(Figu)S 2 x(re)S 165 x(1\2032:)S 498 x(Ethernet)S 167 x(Packet)S
507 y 6260 X F98
(_______________________________________________________________)S
499 y 5991 X(|)S 269 x(Destination)S 269 x(Addr)S 269 x(|)S 269 x
(Source)S 269 x(Addr)S 269 x(|)S 269 x(Protocol)S 269 x(Type)S 269 x
(|)S 269 x(Data)S 269 x(|)S 538 x(CRC)S 537 x(|)S 498 y 6260 X
(---------------------------------------------------------------)S
498 y 7336 X(6)S 269 x(Bytes)S 11909 X(6)S 269 x(Bytes)S 15944 X(2)S
269 x(Bytes)S 19979 X(??)S 807 x(4)S 269 x(Bytes)S 19122 Y 5991 X
F151(\201)S 595 x(Destination)S 217 x(Addr:)S 326 x(The)S 219 x
(Ethernet)S 219 x(address)S 217 x(of)S 218 x(the)S 219 x(node)S 218 x
(to)S 218 x(which)S 219 x(the)S 598 y 6888 X(packet)S 214 x(is)S
213 x(being)S 214 x(sent.)S 364 x(In)S 214 x(addition)S 213 x(to)S
214 x(sending)S 214 x(a)S 213 x(packet)S 214 x(to)S 214 x(a)S 213 x
(speci)S
(\211c)S 598 y 6888 X(node')S -19 x(s)S 228 x(address,)S 245 x(a)S
228 x(packet)S 229 x(can)S 229 x(be)S 229 x(sent)S 228 x(to)S 228 x
(a)S 229 x(Multicast)S 228 x(address)S 228 x(\(as)S 228 x(a)S 598 y
6888 X(V)S -47 x(ax')S -18 x(s)S 227 x(service)S 228 x(announ)S 2 x
(cement)S 227 x(is\),)S 243 x(which)S 228 x(is)S 227 x(heard)S 228 x
(by)S 227 x(more)S 228 x(than)S 228 x(one)S 597 y 6888 X(node)S 183 x
(on)S 183 x(the)S 183 x(Ethernet.)S 271 x(It)S 183 x(can)S 183 x
(also)S 182 x(be)S 182 x(sent)S 183 x(to)S 182 x(a)S 183 x
("Broadcast")S 181 x(address,)S 598 y 6888 X(which)S 166 x(targets)S
166 x(ALL)S 166 x(nodes)S 166 x(on)S 167 x(the)S 166 x(Ethernet.)S
897 y 5991 X(\201)S 595 x(Source)S 166 x(Addr:)S 222 x(The)S 167 x
(Ethernet)S 166 x(address)S 165 x(af)S 166 x(the)S 166 x(node)S 167 x
(sending)S 167 x(the)S 166 x(packet.)S 896 y 5991 X(\201)S 595 x
(Protocol)S 166 x(T)S -25 x(ype:)S 222 x(60-03)S 166 x(for)S 166 x
(DECNE)S -2 x(T)S -45 x(,)S 166 x(60-04)S 166 x(for)S 166 x(LA)S
-27 x(T)S -46 x(,)S 167 x(etc.)S 897 y 5991 X(\201)S 595 x(Data:)S
221 x(Between)S 165 x(46)S 166 x(and)S 167 x(1500)S 166 x(bytes)S
165 x(of)S 166 x(data.)S 897 y 5991 X(\201)S 595 x(CRC:)S 165 x
(CRC-32)S 165 x(polynomial)S 166 x(check)S 168 x(on)S 166 x(the)S
166 x(rest)S 166 x(of)S 166 x(the)S 166 x(frame')S -19 x(s)S 166 x
(data.)S 29901 Y 18152 X F152(LA)S -37 x(T)S 167 x(Overvi)S -2 x(ew)S
498 x(1\2037)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Now)S -46 x(,)S 232 x(in)S 219 x(a)S 219 x
(typical)S 219 x(LA)S -28 x(T)S 219 x(Packet,)S 233 x(the)S 219 x
("Data")S 218 x(\211eld)S 219 x(will)S 218 x(contain)S 219 x(a)S
219 x("V)S -23 x(irtual)S 598 y 5991 X(Circuit)S 208 x(Header")S
207 x(and)S 208 x("Slot)S 207 x(Data".)S 346 x(The)S 209 x(V)S -22 x
(irtual)S 207 x(Circuit)S 208 x(Header)S 208 x(contains)S 598 y
5991 X(V)S -22 x(irtual)S 150 x(Circuit)S 151 x(ID,)S 150 x(Message)S
151 x(T)S -26 x(ype)S 151 x(\(Stop,)S 154 x(Start,)S 154 x(or)S 151 x
(Run)S
(\),)S 154 x(and)S 151 x(Message)S 151 x(Se-)S 598 y 5991 X(quence)S
118 x(#')S -19 x(s.)S 206 x(THEOR)S -20 x(Y)S 117 x(SIMPLIFICA)S
-28 x(TION:)S 117 x(Start)S 117 x(messages)S 117 x(are)S 117 x(to)S
117 x(establish)S 597 y 5991 X(connections,)S 218 x(Stop)S 205 x
(messages)S 206 x(are)S 206 x(to)S 206 x(terminate)S 206 x(them,)S
217 x(and)S 206 x(Run)S 207 x(messages)S 598 y 5991 X(are)S 166 x
(the)S 167 x(average)S 167 x(working)S 167 x(slob,)S 166 x
(tranmitting)S 166 x(data)S 166 x(back)S 166 x(and)S 167 x(forth.)S
8453 Y 4796 X F24(1.5)S 348 x(What)S 232 x(is)S 233 x(a)S 232 x
(Slot?)S 10246 Y 5991 X F151(A)S 200 x(SLOT)S 201 x(is)S 200 x(a)S
201 x("package")S 201 x(of)S 201 x(data,)S 210 x(associated)S 200 x
(with)S 200 x(only)S 202 x(1)S 200 x("session")S 200 x(either)S 598 y
5991 X(between)S 238 x(a)S 239 x(terminal)S 238 x(server)S 239 x
(and)S 239 x(a)S 238 x(V)S -46 x(ax,)S 257 x(or)S 239 x(between)S
238 x(2)S 239 x(terminal)S 238 x(servers)S 597 y 5991 X(\(using)S
251 x("reverse)S 250 x(LA)S -28 x(T"\).)S 474 x(For)S 250 x(clarity)S
-55 x(,)S 272 x(we'll)S 249 x(assume)S 249 x(a)S 250 x(typical)S
250 x(server/V)S -45 x(ax)S 598 y 5991 X(session.)S 441 x(The)S 240 x
(SLOT)S 239 x(has)S 239 x(a)S 240 x(255)S 239 x(byte)S 239 x
(maximum)S 240 x(size.)S 441 x(Each)S 239 x(Slot)S 239 x(has)S 239 x
(a)S 598 y 5991 X("CRED)S -2 x(IT")S 155 x(associated)S 155 x(with)S
155 x(it,)S 157 x(and)S 156 x(it)S 155 x(is)S 155 x(these)S 155 x
(CREDIT)S -32 x(s)S 155 x(which)S 156 x(implement)S 598 y 5991 X
(\212ow)S 166 x(control)S 167 x(between)S 165 x(the)S 167 x(server)S
166 x(and)S 167 x(the)S 166 x(V)S -46 x(ax.)S 15028 Y 5991 X(In)S
218 x(the)S 218 x(Server/V)S -45 x(ax)S 218 x(example,)S 231 x(the)S
218 x(Server)S 218 x(is)S 217 x(AL)S -37 x(W)S -46 x(A)S -46 x(YS)S
217 x(the)S 218 x("master")S 216 x(node,)S 598 y 5991 X(the)S 254 x
(V)S -46 x(ax)S 253 x(is)S 253 x(AL)S -37 x(W)S -46 x(A)S -46 x(YS)S
253 x(the)S 254 x("slave")S 253 x(node.)S 484 x(When)S 254 x(the)S
254 x(session)S 253 x(is)S 253 x(initiated)S 597 y 5991 X(\(the)S
219 x(user)S 219 x(types)S 218 x("CONNECT)S 218 x(Service_name")S
219 x(at)S 219 x(the)S 219 x(DEC)S -2 x(server)S 28 x(')S -18 x(s)S
218 x(Local>)S 598 y 5991 X(prompt\),)S 197 x(each)S 192 x(node)S
191 x(extends)S 192 x(one)S 191 x(or)S 191 x(more)S 192 x(CRE)S -2 x
(DIT)S 191 x(to)S 191 x(the)S 191 x(other)S 191 x(node.)S 298 x(A)S
598 y 5991 X(node)S 153 x(MUST)S 153 x(be)S 152 x(prepared)S 153 x
(to)S 152 x(buffer)S 153 x(255)S 153 x(bytes)S 152 x(for)S 153 x
(each)S 153 x(CRED)S -2 x(IT)S 153 x(it)S 152 x(extends)S 598 y
5991 X(to)S 166 x(the)S 166 x(other)S 167 x(node.)S 896 y 5991 X
(Credits)S 129 x(are)S 131 x(normally)S 130 x(extended)S 131 x
(between)S 130 x(nodes)S 130 x(on)S 131 x(an)S 130 x(ongoin)S 2 x(g)S
130 x(basis;)S 142 x(When)S 598 y 5991 X(a)S 148 x(DEC)S -2 x
(server)S 149 x(sends)S 147 x(a)S 147 x(Data)S 147 x(slot)S 147 x
(to)S 147 x(a)S 148 x(V)S -46 x(ax,)S 152 x(the)S 148 x(DECs)S -2 x
(erver)S 149 x(must)S 147 x(decrement)S 598 y 5991 X(its)S 189 x
(internal)S 191 x(credit)S 190 x(counter)S 191 x(for)S 190 x(that)S
190 x(session.)S 293 x(When)S 191 x(the)S 190 x(V)S -46 x(ax)S 190 x
(sends)S 190 x(a)S 190 x(Slot)S 598 y 5991 X(message)S 139 x(back)S
141 x(to)S 139 x(the)S 140 x(DECserver)S -37 x(,)S 145 x(it)S 140 x
(will)S 139 x(\(usually\))S 140 x(return)S 141 x(a)S 139 x(CREDIT)S
138 x(to)S 140 x(the)S 597 y 5991 X(DECserver)S 162 x(as)S 162 x
(part)S 162 x(of)S 163 x(the)S 162 x(Datagram.)S 221 x(This)S 162 x
(CREDIT)S 161 x(represents)S 163 x(the)S 162 x(V)S -46 x(ax')S -18 x
(s)S 598 y 5991 X(ability)S 189 x(to)S 189 x(buffer)S 189 x(255)S
188 x(more)S 189 x(bytes)S 189 x(of)S 189 x(data,)S 195 x(should)S
189 x(the)S 189 x(DECs)S -2 x(erver)S 190 x(need)S 189 x(to)S 598 y
5991 X(send)S 136 x(it.)S 212 x(Likewise,)S 143 x(as)S 135 x(the)S
137 x(DECs)S -2 x(erver)S 138 x(empties)S 135 x(his)S 136 x(session)S
136 x(data)S 136 x(buffers)S 136 x(\(for)S 598 y 5991 X(instance,)S
131 x(by)S 122 x(outputting)S 122 x(data)S 121 x(to)S 121 x(the)S
122 x(user)S 28 x(')S -19 x(s)S 121 x(screen\),)S 131 x(it)S 121 x
(will)S 121 x(extend)S 122 x(CREDI)S -2 x(T)S -30 x(s)S 597 y 5991 X
(back)S 167 x(to)S 165 x(the)S 167 x(V)S -46 x(ax,)S 166 x
(indicating)S 167 x(that)S 166 x(more)S 166 x(data)S 166 x(can)S
167 x(be)S 166 x(sent.)S 25489 Y 5991 X(Between)S 167 x(any)S 168 x
(DECs)S -2 x(erver)S 168 x(port)S 167 x(and)S 168 x(its)S 166 x
(terminal)S 167 x(device,)S 169 x(a)S 167 x(method)S 167 x(of)S 167 x
(Flow)S 597 y 5991 X(Control)S 180 x(such)S 180 x(as)S 180 x
(XON/XOFF)S 179 x(\(In-Band\))S 180 x(or)S -37 x(,)S 184 x(on)S 180 x
(some)S 180 x(servers)S 180 x(DSR/DTR)S 179 x(or)S 598 y 5991 X
(CTS/RTS)S 130 x(\(Out)S 131 x(of)S 130 x(Band\))S 130 x(is)S 130 x
(used.)S 210 x(For)S 131 x(instance,)S 139 x(if)S 130 x(an)S 131 x
(LN03')S -19 x(s)S 130 x(buffer)S 131 x(\211lls)S 131 x(up,)S 598 y
5991 X(perhaps)S 193 x(after)S 194 x(a)S 193 x(paper)S 194 x
(outage,)S 201 x(it)S 193 x(will)S 193 x(send)S 193 x(an)S 194 x
(XOFF)S 193 x(to)S 193 x(the)S 194 x(server)S 194 x(port,)S 598 y
5991 X(to)S 171 x(stop)S 170 x(the)S 171 x(port)S 171 x(from)S 171 x
(sending)S 172 x(data.)S 236 x(How)S 171 x(and)S 171 x(when)S 171 x
(does)S 171 x(the)S 171 x(DECs)S -2 x(erver)S 597 y 5991 X(tell)S
166 x(the)S 166 x(V)S -56 x(AX)S 166 x(to)S 166 x(stop)S 165 x
(sending)S 167 x(packets)S 166 x(for)S 166 x(this)S 166 x(session)S
165 x(over)S 167 x(the)S 166 x(Ethernet?)S 29901 Y 4796 X F152
(1\2038)S 498 x(LA)S -37 x(T)S 166 x(Overview)S
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1000 BP 39600 30600 PM 0 0 XY
4497 Y 5991 X F151(In)S 208 x(order)S 208 x(for)S 209 x(the)S 208 x
(V)S -47 x(ax)S 209 x(to)S 208 x(send)S 208 x(a)S 208 x("SLOT")S
207 x(of)S 208 x(data)S 207 x(to)S 208 x(this)S 208 x(session,)S
218 x(it)S 208 x(must)S 597 y 5991 X(have)S 147 x(a)S 146 x(CREDIT)S
-47 x(.)S 147 x(When)S 146 x(the)S 147 x(V)S -56 x(AX)S 146 x(sends)S
146 x(the)S 146 x(slot)S 146 x(to)S 146 x(the)S 146 x(server)S -36 x
(,)S 151 x(it)S 146 x("gives)S 146 x(up")S 598 y 5991 X(a)S 214 x
(credit.)S 366 x(The)S 215 x(server)S 215 x(buffers)S 214 x(the)S
214 x(data)S 214 x(for)S 214 x(the)S 214 x(session)S 214 x(in)S 214 x
(one)S 215 x(of)S 214 x(its)S 213 x(255)S 598 y 5991 X(byte)S 214 x
(buffers,)S 226 x(and)S 214 x(after)S 214 x(it)S 213 x(has)S 214 x
(emptied)S 213 x(the)S 214 x(buffer)S 214 x(\(by)S 214 x(sending)S
215 x(the)S 214 x(data)S 598 y 5991 X(out)S 175 x(the)S 175 x(port)S
175 x(to)S 174 x(the)S 175 x(printer\),)S 178 x(it)S 174 x(will)S
174 x(give)S 176 x(back)S 175 x(1)S 175 x(credit)S 175 x(to)S 174 x
(the)S 175 x(V)S -56 x(AX,)S 175 x(which)S 597 y 5991 X(can)S 167 x
(now)S 167 x(send)S 167 x(another)S 168 x(slot.)S 223 x(If)S 167 x
(the)S 167 x(port)S 167 x(has)S 166 x(been)S 168 x(XOFF'd,)S 166 x
(the)S 168 x(server)S 167 x(will)S 598 y 5991 X(be)S 158 x(unable)S
158 x(to)S 157 x(empty)S 158 x(its)S 156 x(buffer)S 158 x(\(until)S
158 x(it)S 157 x(gets)S 158 x(an)S 157 x(XON)S 157 x(from)S 158 x
(the)S 157 x(LN03\),)S 160 x(and)S 598 y 5991 X(will)S 148 x(not)S
149 x(return)S 149 x(a)S 149 x(credit)S 149 x(to)S 148 x(the)S 149 x
(V)S -46 x(ax.)S 217 x(Current)S 149 x(DECs)S -2 x(erver)S 150 x
(implementations)S 598 y 5991 X(typically)S 195 x(extend)S 195 x(2)S
195 x(CRED)S -2 x(IT)S -31 x(s)S 194 x(per)S 195 x(session,)S 201 x
(so)S 195 x(the)S 194 x(server)S 195 x(is)S 194 x(able)S 195 x(to)S
194 x(buffer)S 597 y 5991 X(510)S 186 x(bytes)S 187 x(per)S 186 x
(session,)S 192 x(after)S 186 x(which)S 187 x(time)S 186 x(the)S
186 x(V)S -55 x(AX)S 186 x(must)S 186 x(wait)S 185 x(for)S 187 x(a)S
186 x(credit)S 598 y 5991 X(to)S 166 x(be)S 166 x(returned)S 167 x
(before)S 166 x(it)S 166 x(can)S 166 x(send)S 166 x(any)S 167 x
(more)S 167 x(data.)S 12267 Y 5991 X(Just)S 127 x(as)S 127 x(there)S
128 x(are)S 128 x(different)S 128 x(types)S 127 x(of)S 128 x(VC)S
127 x(messages)S 126 x(\(Start,)S 136 x(Run,)S 136 x(Stop\),)S 135 x
(there)S 598 y 5991 X(are)S 166 x(different)S 166 x(types)S 166 x
(of)S 166 x(SLOT)S 166 x(messages:)S 897 y 5991 X(1.)S 482 x(Start)S
165 x(Slot-)S 166 x(For)S 166 x(session)S 166 x(creation.)S 897 y
5991 X(2.)S 482 x(Stop)S 143 x(Slot-)S 144 x(For)S 144 x(session)S
143 x(termination,)S 149 x(usually)S 145 x(after)S 144 x(the)S 144 x
(user)S 144 x(logs)S 144 x(off)S 144 x(the)S 597 y 6888 X(vax.)S
897 y 5991 X(3.)S 482 x(Data)S 165 x(A-)S 166 x(The)S 166 x(working)S
167 x(slob,)S 166 x(pushing)S 167 x(data)S 166 x(back)S 167 x(and)S
166 x(forth.)S 897 y 5991 X(4.)S 482 x(Data)S 193 x(B-)S 194 x(For)S
195 x(communicating)S 196 x(port)S 194 x(characteristics,)S 202 x
(session)S 194 x(character-)S 597 y 6888 X(istics)S 165 x(such)S
166 x(as)S 166 x(Interactive,)S 167 x(Passthru,)S 167 x(or)S 166 x
(Passall.)S 897 y 5991 X(5.)S 482 x(Attention-)S 165 x(T)S -45 x(o)S
166 x(signal)S 166 x("abort-output")S 166 x(\(^O\),)S 166 x(does)S
165 x(not)S 167 x(require)S 166 x(credits.)S 20038 Y 4796 X F24(1.6)S
348 x(NON)S 231 x(CAR)S -2 x(BORU)S -2 x(NDUM)S 231 x(ILLEGITEMA)S
-52 x(TUS!)S 21832 Y 5991 X F151(That')S -18 x(s)S 215 x(about)S
216 x(as)S 216 x(much)S 217 x(typing)S 217 x(as)S 215 x(I)S 216 x
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216 x(Theory)S -54 x(.)S 372 x(For)S 597 y 5991 X(those)S 166 x(of)S
166 x(you)S 167 x(with)S 166 x(a)S 166 x(thirst)S 165 x(for)S 166 x
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5991 X(\201)S 595 x(DECs)S -2 x(erver)S 167 x(200/500)S 166 x(Doc)S
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166 x(Network)S 166 x(Concepts.)S 897 y 5991 X(\201)S 595 x(Digital)S
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(\201)S 595 x(LA)S -28 x(T)S 113 x(notes)S 113 x(\211le)S 114 x
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(in)S 166 x(here.)S 897 y 5991 X(\201)S 595 x(ST)S -28 x(ARS)S 29901 Y
18152 X F152(LA)S -37 x(T)S 167 x(Overvi)S -2 x(ew)S 498 x(1\2039)S
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1000 BP 39600 30600 PM 0 0 XY
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164 x(will)S 163 x(be)S 163 x(introduced)S 164 x(to)S 163 x(the)S
164 x(different)S 163 x(types)S 164 x(of)S 163 x(servers.)S 15957 Y
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4796 16779 XY F161(Function)S 10973 X(DECSA)S 13740 X(DEC100)S 16508 X
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17928 24 R 648 y 4796 X F159(Number)S 134 x(of)S 135 x(terminal)S
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4796 X(on)S 133 x(model\))S -499 y 10973 X(yes)S 13740 X(no)S 16508 X
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165 x(models)S 166 x(support)S 165 x(Host-initiated)S 165 x(connec)S
2 x(tions)S 165 x(\(Printer)S 167 x(support\).)S 23504 Y 4796 X F24
(2.1)S 348 x(Ethernet)S 233 x(T)S -52 x(erminal)S 232 x(Server)S
233 x(\(DECSA\))S 25297 Y 5991 X F151(The)S 170 x(Ethernet)S 170 x
(T)S -46 x(erminal)S 170 x(Server)S 170 x(\(ETS\))S 169 x(was)S 169 x
(Digital')S -20 x(s)S 169 x(\211rst)S 170 x(terminal)S 169 x(server)S
-36 x(.)S 598 y 5991 X(It)S 187 x(is)S 187 x(based)S 187 x(on)S 188 x
(the)S 188 x(DEC)S -2 x(SA)S 187 x(box,)S 194 x(which)S 188 x(is)S
187 x(basically)S 187 x(a)S 188 x(PDP1)S -28 x(1/24)S 188 x(in)S
188 x(a)S 187 x(cus-)S 598 y 5991 X(tomized)S 263 x(box.)S 517 x(In)S
265 x(addition)S 264 x(to)S 264 x(the)S 264 x(processor)S 264 x
(module,)S 290 x(the)S 264 x(box)S 265 x(contains)S 598 y 5991 X
(512K)S 250 x(of)S 251 x(memory)S -55 x(,)S 272 x(a)S 251 x(DEUNA)S
250 x(ethernet)S 251 x(interface,)S 273 x(a)S 250 x(CBT)S 251 x
(module)S 250 x(\(Con-)S 597 y 5991 X(sole/Bootstrap/T)S -46 x
(erminator\),)S 213 x(up)S 204 x(to)S 203 x(2)S 203 x(Protocol)S
204 x(Assist)S 202 x(\(P)S -37 x(AM\))S 203 x(module)S 204 x(sets,)S
598 y 5991 X(and)S 209 x(up)S 209 x(to)S 208 x(8)S 208 x(line)S 209 x
(cards)S 208 x(for)S 209 x(each)S 209 x(P)S -37 x(AM)S 209 x(set.)S
348 x(Thus,)S 220 x(a)S 209 x(full)S 208 x(blown)S 209 x(ETS)S 208 x
(can)S 29901 Y 16715 X F152(Personnae)S 167 x(Dramatis)S 498 x
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3969 Y 5991 X F151(have)S 160 x(16)S 159 x(line)S 160 x(cards,)S
161 x(each)S 160 x(having)S 160 x(2)S 160 x(ports,)S 160 x(for)S
160 x(a)S 159 x(maximum)S 159 x(of)S 160 x(32)S 159 x(ports)S 159 x
(on)S 159 x(a)S 598 y 5991 X(ETS.)S 6360 Y 5991 X(In)S 171 x
(addition)S 170 x(to)S 170 x(the)S 171 x(normal)S 171 x(counters,)S
173 x(status,)S 171 x(etc,)S 172 x(the)S 171 x(ETS)S 170 x(has)S
171 x(a)S 170 x(Loadable)S 598 y 5991 X(Diagnostic)S 166 x(Image)S
167 x(\(LDI\)w)S -2 x(hich)S 168 x(it)S 166 x(can)S 166 x(downline)S
167 x(load.)S 222 x(The)S 167 x(LDI)S 166 x(performs)S 166 x(a)S
598 y 5991 X(comprehensive)S 152 x(test)S 151 x(of)S 151 x(the)S
151 x(ETS,)S 152 x(and)S 151 x(can)S 152 x(take)S 151 x(15-20)S 151 x
(minutes)S 151 x(to)S 151 x(complete.)S 598 y 5991 X(T)S -46 x(o)S
142 x(initiate,)S 146 x(depress)S 141 x(the)S 141 x(TEST)S 141 x
(switch)S 141 x(on)S 141 x(the)S 142 x(ETS)S 141 x(and)S 141 x
(depress)S 141 x(the)S 141 x(ST)S -27 x(ART)S 597 y 5991 X(button.)S
340 x(This)S 205 x(will)S 204 x(reboot)S 206 x(the)S 205 x(ETS,)S
205 x(load)S 205 x(the)S 206 x(LDI)S 204 x(software,)S 215 x(and)S
205 x(indicate)S 598 y 5991 X(results)S 130 x(of)S 131 x(the)S 131 x
(testing)S 130 x(in)S 131 x(the)S 131 x(LED)S 130 x(displays.)S 210 x
(For)S 131 x(full)S 131 x(information)S 131 x(regarding)S 598 y
5991 X(ETS)S 204 x(testing)S 205 x(with)S 204 x(LDI,)S 205 x(see)S
204 x(the)S 205 x(Communications)S 204 x(Options)S 204 x
(Minireference)S 598 y 5991 X(Manual)S 167 x(\(EK-C)S -2 x
(MIV4-RM\).)S 12338 Y 5991 X(One)S 134 x(other)S 134 x(spiffy)S 134 x
(difference)S 135 x(of)S 134 x(the)S 134 x(ETS)S 133 x(is)S 134 x
(the)S 134 x(ability)S 134 x(to)S 134 x("hot)S 134 x(swap")S 133 x
(the)S 134 x(line)S 598 y 5991 X(cards.)S 283 x(If)S 187 x(a)S 186 x
(line)S 187 x(card)S 187 x(is)S 186 x(suspect)S 186 x(\(fault)S 186 x
(LED)S 186 x(on)S 187 x(line)S 187 x(card)S 187 x(may)S 187 x(be)S
186 x(lit\),)S 192 x(the)S 597 y 5991 X(line)S 147 x(card)S 146 x
(may)S 147 x(be)S 146 x(removed)S 147 x(and)S 147 x(replaced)S 146 x
(without)S 146 x(powering)S 147 x(off)S 146 x(or)S 147 x(affecting)S
598 y 5991 X(the)S 225 x(runn)S 2 x(ing)S 225 x(ETS.)S 226 x(This)S
225 x(is)S 225 x(because)S 225 x(they)S 226 x(interface)S 225 x(to)S
225 x(the)S 225 x(P)S -36 x(AM)S 224 x(modules)S 598 y 5991 X(via)S
168 x(the)S 169 x(DASH)S 167 x(bus)S 167 x(which)S 169 x(was)S 167 x
(designed)S 168 x(to)S 168 x(allow)S 168 x(this.)S 227 x(This)S 168 x
(is)S 168 x(normally)S 168 x(a)S 598 y 5991 X(customer)S 179 x
(activity)S -55 x(,)S 182 x(as)S 179 x(the)S 178 x(line)S 179 x
(cards)S 179 x(are)S 179 x(usually)S 179 x(not)S 179 x(under)S 180 x
(contract)S 179 x(with)S 598 y 5991 X(the)S 229 x(local)S 228 x
(Field)S 228 x(Service)S 229 x(of\211ce.)S 409 x(If)S 228 x(the)S
229 x(customer)S 228 x(has)S 228 x(any)S 229 x(doubts,)S 244 x
(advise)S 597 y 5991 X(them)S 166 x(to)S 166 x(contact)S 166 x
(Field)S 166 x(Service.)S 18316 Y 5991 X(The)S 117 x(ETS,)S 116 x
(as)S 115 x(well)S 115 x(as)S 116 x(the)S 116 x(DEC)S -2 x(500,)S
127 x(does)S 115 x(not)S 116 x(have)S 117 x(EEPRO)S -2 x(M)S 116 x
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229 x(characteristics)S 230 x(can)S 230 x(be)S 229 x(permanently)S
230 x(stored.)S 412 x(Instead,)S 246 x(it)S 229 x(loads)S 598 y
5991 X(its)S 205 x(characteristics)S 206 x(down)S 206 x(along)S 207 x
(with)S 205 x(its)S 205 x(operating)S 207 x(system,)S 216 x(every)S
207 x(time)S 206 x(it)S 598 y 5991 X(reboots.)S 279 x(Thus,)S 191 x
(it)S 185 x(is)S 184 x(required)S 186 x(that)S 185 x(the)S 185 x
(ETS)S 185 x(be)S 185 x(con\211g)S 2 x(ured)S 185 x(for)S 185 x
(server)S 186 x(and)S 598 y 5991 X(port)S 178 x(attributes)S 177 x
(on)S 179 x(each)S 179 x(potential)S 177 x(load)S 178 x(host.)S 258 x
(This)S 178 x(is)S 178 x(done)S 178 x(using)S 179 x(the)S 179 x(TSC)S
597 y 5991 X(\(T)S -46 x(erminal)S 146 x(Server)S 146 x
(Con\211gurator\))S 147 x(program,)S 150 x(which)S 146 x(creates)S
145 x(a)S 145 x(unique)S 147 x(version)S 598 y 5991 X(of)S 166 x
(the)S 166 x(load\211le)S 167 x(for)S 166 x(each)S 166 x(ETS.)S
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4796 23098 XY F28(2.1.1)S 300 x(ETS)S 199 x(LED)S 198 x(Display)S
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(LED')S -19 x(s)S 244 x(on)S 244 x(the)S 244 x(front)S 245 x(of)S
243 x(the)S 245 x(CBT)S 243 x(module.)S 456 x(If)S 244 x(lit,)S 263 x
(these)S 598 y 5991 X(indicate)S 166 x(a)S 166 x(problem)S 166 x
(with)S 166 x(\(from)S 166 x(left)S 165 x(to)S 166 x(right\):)S 896 y
5991 X(\201)S 595 x(Line)S 166 x(card)S 897 y 5991 X(\201)S 595 x
(Logic)S 167 x(Module)S 897 y 5991 X(\201)S 595 x(DEUNA)S -2 x
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(2\2032)S 498 x(Personnae)S 167 x(Dramatis)S
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3969 Y 5991 X F151(Each)S 126 x(Line)S 126 x(card)S 126 x(also)S
125 x(has)S 126 x(an)S 126 x(LED-)S 125 x(If)S 125 x(a)S 126 x(Line)S
126 x(card')S -18 x(s)S 125 x(LED)S 125 x(is)S 125 x(lit,)S 134 x
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(problem)S 166 x(with)S 166 x(the)S 166 x(Line)S 167 x(card.)S 897 y
5991 X(If)S 147 x(the)S 148 x(Logic)S 148 x(LED)S 147 x(is)S 147 x
(lit,)S 152 x(Extended)S 148 x(diagnostics)S 147 x(should)S 148 x
(be)S 147 x(run)S 149 x(to)S 147 x(isolate)S 147 x(the)S 598 y 5991 X
(problem.)S 222 x(See)S 166 x(the)S 166 x(Comm.)S 221 x(Options)S
166 x(Minireference)S 167 x(Manual)S 167 x(for)S 166 x(more)S 166 x
(info.)S 7556 Y 4796 X F24(2.2)S 348 x(DECs)S -2 x(erver)S 233 x
(100)S 9349 Y 5991 X F151(The)S 143 x(DEC)S -2 x(server)S 143 x(100)S
142 x(is)S 141 x(the)S 142 x(next)S 143 x(member)S 142 x(of)S 142 x
(this)S 141 x(happy)S 143 x(family)S -55 x(.)S 213 x(In)S 142 x
(contrast)S 598 y 5991 X(to)S 206 x(the)S 207 x(ETS,)S 206 x(he)S
207 x(provides)S 206 x(only)S 207 x(8)S 206 x(non-modem)S 207 x
(control)S 207 x(ports,)S 216 x(and)S 206 x(is)S 206 x(about)S 598 y
5991 X(the)S 196 x(size)S 196 x(of)S 196 x(a)S 196 x(shoebox.)S 313 x
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270 x(MHZ)S 270 x(for)S 270 x(its)S 268 x(brain.)S 533 x(It)S 269 x
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269 x(512)S 598 y 5991 X(bytes)S 257 x(of)S 257 x(EEPRO)S -2 x(M)S
257 x(in)S 258 x(which)S 257 x(it)S 256 x(keeps)S 257 x(server)S
258 x(and)S 257 x(port)S 257 x(characteristics.)S 598 y 5991 X(The)S
187 x(information)S 187 x(in)S 187 x(EEPROM)S 186 x(is)S 186 x
(retained)S 187 x(after)S 187 x(power)S 186 x(down,)S 192 x(so)S
187 x(it)S 186 x(is)S 186 x(not)S 598 y 5991 X(necessary)S 129 x(to)S
127 x(down-line)S 128 x(load)S 128 x(server)S 129 x(or)S 128 x(port)S
128 x(attributes.)S 208 x(Thus,)S 137 x(all)S 128 x(DEC10)S -2 x(0')S
-18 x(s)S 597 y 5991 X(down-line)S 166 x(load)S 166 x(the)S 166 x
(same)S 166 x(exact)S 166 x(\211le,)S 167 x(PS0801ENG.SYS.)S 15327 Y
5991 X(The)S 147 x(8)S 146 x(DB25)S 145 x(ports)S 146 x(provide)S
146 x(only)S 147 x(three)S 147 x(pins:)S 211 x(2,3,)S 151 x(and)S
147 x(7)S 146 x(\(TX,)S 146 x(RX,)S 146 x(GND\).)S 145 x(No)S 598 y
5991 X(modem)S 119 x(control)S 119 x(is)S 119 x(provided.)S 206 x
(This,)S 129 x(in)S 119 x(conju)S 2 x(ction)S 119 x(with)S 118 x
(the)S 119 x(DEC100')S -20 x(s)S 119 x(limited)S 597 y 5991 X
(memory)S 156 x(\(compared)S 156 x(to)S 155 x(the)S 156 x(DEC)S -2 x
(200\))S 156 x(prevent)S 156 x(him)S 156 x(from)S 155 x(being)S 156 x
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232 x(LARGE)S 231 x(ethernet)S 232 x(environ)S 2 x(ment,)S 598 y
5991 X(with)S 200 x(a)S 201 x(great)S 202 x(number)S 201 x(of)S 201 x
(LA)S -27 x(T)S 201 x(hosts,)S 209 x(the)S 201 x(DEC100)S 200 x(is)S
200 x(more)S 201 x(susceptible)S 200 x(to)S 598 y 5991 X(runnin)S
2 x(g)S 143 x(out)S 143 x(of)S 143 x(memory)S 143 x(in)S 144 x
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143 x(LA)S -27 x(T)S 143 x(services)S 597 y 5991 X(\(See)S 143 x
(Managing)S 145 x(Server)S 144 x(Memory)S -54 x(,)S 148 x(section)S
143 x(5.4,)S 149 x(DEC)S -2 x(server)S 144 x(100)S 143 x(mgmt.)S
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166 x(LED)S 165 x(on)S 167 x(the)S 166 x(back.)S 897 y 5991 X(\201)S
595 x(ON)S 165 x(-)S 166 x(Self)S 166 x(test)S 165 x(passed)S 165 x
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151 x(console)S 152 x(port)S 151 x(for)S 151 x(more)S 152 x(info.)S
29901 Y 16715 X F152(Personnae)S 167 x(Dramatis)S 498 x(2\2033)S
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4125 Y 4796 X F24(2.3)S 348 x(DECs)S -2 x(erver)S 233 x(200)S 5918 Y
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(200)S 167 x(is)S 165 x(much)S 167 x(less)S 166 x(likely)S 167 x
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(out)S 166 x(of)S 166 x(memory)S 167 x(in)S 166 x(a)S 166 x(large)S
167 x(Ethernet)S 166 x(environmen)S 2 x(t.)S 11298 Y 5991 X(The)S
285 x(DECserver)S 284 x(200)S 285 x(comes)S 284 x(in)S 285 x(2)S
284 x(\212avors,)S 315 x(the)S 285 x(/DL)S 285 x(and)S 285 x(the)S
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229 x(modem)S 229 x(control)S 230 x(ports,)S 245 x(and)S 230 x(can)S
230 x(also)S 229 x(implement)S 597 y 5991 X(DSR/DTS)S 165 x(or)S
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(Dramatis)S
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3969 Y 5991 X F151(D4)S 166 x(\(Bottom\))S 165 x(Ethernet)S 166 x
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(memory)S 210 x(are)S 598 y 5991 X(contained)S 196 x(on)S 195 x(a)S
195 x(single)S 196 x(Qbus)S 194 x(module.)S 310 x(Next)S 195 x(on)S
195 x(the)S 196 x(Qbus)S 194 x(is)S 195 x(a)S 195 x(DEQNA)S 193 x
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(Ethernet,)S 158 x(and)S 154 x(8)S 155 x(Qbus)S 154 x(slots)S 153 x
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597 y 5991 X(There)S 167 x(are)S 166 x(curren)S 2 x(tly)S 166 x(2)S
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166 x(8)S 166 x(full)S 166 x(modem)S 166 x(control)S 167 x(ports)S
897 y 5991 X(\201)S 595 x(CXA16)S 165 x(-)S 166 x(Provides)S 166 x
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-2 x(,)S 128 x(then)S 119 x(the)S 118 x(DEC500)S 117 x(will)S 118 x
(provide)S 598 y 5991 X(128)S 217 x(data)S 217 x(lead)S 217 x(only)S
218 x(ports.)S 376 x(If)S 216 x(all)S 218 x(contain)S 217 x(CXY08s,)S
230 x(then)S 217 x(the)S 218 x(Server)S 218 x(will)S 598 y 5991 X
(provide)S 216 x(64)S 215 x(Modem)S 215 x(Control)S 215 x(ports.)S
369 x(Anywhere)S 216 x(from)S 215 x(1)S 215 x(to)S 215 x(8)S 215 x
(cards)S 215 x(can)S 215 x(be)S 598 y 5991 X(used)S 208 x(in)S 208 x
(1)S 208 x(box,)S 220 x(but)S 208 x(there)S 209 x(can)S 208 x(be)S
208 x(no)S 209 x(empty)S 208 x(slots)S 207 x(BETWEEN)S 207 x(line)S
208 x(cards.)S 597 y 5991 X(Also,)S 144 x(the)S 139 x(DEC500)S 138 x
(cards)S 139 x(CANNOT)S 138 x(be)S 139 x("Hot)S 138 x(Swapped")S
138 x(as)S 139 x(the)S 139 x(DECS)S -2 x(A/ETS)S 598 y 5991 X(line)S
166 x(cards)S 166 x(can.)S 22799 Y 4796 X F28(2.4.1)S 300 x
(DECserver)S 198 x(550)S 24592 Y 5991 X F151(The)S 277 x(Decserver)S
276 x(550)S 277 x(is)S 275 x(a)S 276 x("Souped)S 277 x(up")S 276 x
(version)S 277 x(of)S 276 x(the)S 276 x(DECserver)S 276 x(500.)S
598 y 5991 X(Differences)S 166 x(include:)S 896 y 5991 X(\201)S 595 x
(The)S 188 x(KDJ1)S -29 x(1-SD)S 187 x(CPU)S 187 x(module)S 187 x
(is)S 187 x(J-1)S -28 x(1)S 187 x(based,)S 193 x(with)S 187 x(1.5)S
187 x(MB)S 188 x(of)S 187 x(onboard)S 598 y 6888 X(memory)S -55 x(,)S
166 x(and)S 167 x(a)S 166 x(18)S 166 x(Mhz)S 166 x(version)S 167 x
(of)S 166 x(the)S 166 x(DCJ1)S -28 x(1)S 166 x(processor)S 166 x
(chip.)S 897 y 5991 X(\201)S 595 x(The)S 140 x(DESQA-)S -2 x(SA)S
140 x(module)S 140 x(is)S 140 x(used,)S 145 x(providing)S 142 x
(both)S 140 x(ThinW)S -18 x(ire)S 140 x(and)S 140 x(Thick-)S 598 y
6888 X(W)S -19 x(ire)S 166 x(connection)S 167 x(ports.)S 29901 Y
16715 X F152(Personnae)S 167 x(Dramatis)S 498 x(2\2035)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(\201)S 595 x(The)S 112 x(DECs)S -2 x(erver)S 113 x
(550)S 111 x(has)S 112 x(two)S 111 x(\(2\))S 111 x(H7868)S 111 x
(power)S 112 x(supplies,)S 122 x(each)S 112 x(providing)S 598 y
6888 X(power)S 151 x(to)S 151 x(6)S 152 x(backplane)S 152 x(slots.)S
216 x(In)S 152 x(contrast,)S 155 x(the)S 151 x(DECserver)S 151 x
(500)S 152 x(has)S 151 x(only)S 598 y 6888 X(one)S 135 x(\(1\))S
134 x(H7868)S 134 x(for)S 135 x(all)S 135 x(12)S 134 x(slots.)S 211 x
(This)S 134 x(allows)S 134 x(the)S 135 x(DEC55)S -2 x(0)S 135 x(to)S
135 x(support)S 134 x(\(At)S 598 y 6888 X(press)S 164 x(time\))S
165 x(unann)S 2 x(ounced)S 166 x(future)S 166 x(line)S 165 x(cards,)S
166 x(which)S 166 x(may)S 165 x(have)S 167 x(greater)S 597 y 6888 X
(power)S 165 x(requirements.)S 897 y 5991 X(The)S 167 x(DECs)S -2 x
(erver)S 167 x(550)S 166 x(uses)S 166 x(the)S 166 x(same)S 166 x
(enclosure)S 167 x(\(BA213\))S 165 x(as)S 165 x(the)S 166 x(DEC500.)S
8453 Y 4796 X F28(2.4.2)S 300 x(DECserver)S 198 x(5XX)S 199 x(LED)S
199 x(displa)S 2 x(y)S 10246 Y 5991 X F151(The)S 167 x(DECs)S -2 x
(erver)S 167 x(5XX)S 166 x(has)S 166 x(multiple)S 165 x(LED)S 166 x
(displays:)S 896 y 5991 X(\201)S 595 x(DC)S 165 x(OK)S 165 x(LED)S
166 x(on)S 166 x(right)S 167 x(indicates)S 166 x(DC)S 165 x(power)S
166 x(OK)S 897 y 5991 X(\201)S 595 x(Line)S 166 x(Card)S 166 x(LED')S
-19 x(s)S 165 x(-)S 166 x(ON)S 166 x(=)S 166 x(OK)S 897 y 5991 X
(\201)S 595 x(Ethernet)S 166 x(Interface)S 166 x(Self)S 166 x(test)S
165 x(LED')S -19 x(s)S 165 x(-)S 166 x(All)S 166 x(should)S 166 x
(be)S 166 x(OFF)S 896 y 5991 X(\201)S 595 x(Numeric)S 317 x(Displ)S
-2 x(ay)S 317 x(should)S 317 x(alternate)S 316 x(0/8)S 317 x(during)S
318 x(normal)S 316 x(operation.)S 598 y 6888 X(Other)S 166 x(codes)S
166 x(may)S 166 x(be)S 166 x(displayed)S 166 x(during)S 167 x
(testing,)S 167 x(or)S 166 x(if)S 166 x(an)S 166 x(error)S 167 x
(occurrs.)S 897 y 5991 X(The)S 225 x(DECserver)S 225 x(5XX)S 224 x
(also)S 224 x(has)S 225 x(a)S 224 x(Boot)S 225 x(Mode)S 225 x
(rotary)S 225 x(switch)S 224 x(on)S 225 x(the)S 225 x(CPU)S 598 y
5991 X(module.)S 222 x(Different)S 166 x(self-test)S -2 x(s)S 166 x
(may)S 166 x(be)S 166 x(run)S 167 x(using)S 167 x(this)S 166 x
(switch.)S 17419 Y 4796 X F24(2.5)S 348 x(MUXserve)S -2 x(r)S 233 x
(100)S 19212 Y 5991 X F151(This)S 196 x(last)S 196 x(server)S 196 x
(is)S 196 x(a)S 196 x(bit)S 196 x(of)S 196 x(an)S 197 x(odd)S 196 x
(beast.)S 311 x(It)S 196 x(was)S 195 x(originally)S 197 x(designed)S
197 x(by)S 598 y 5991 X(Australia)S 186 x(CSS)S 186 x(strictly)S
187 x(as)S 186 x(a)S 187 x(local)S 187 x(product,)S 193 x(designed)S
187 x(to)S 186 x(meet)S 187 x(local)S 187 x(needs,)S 598 y 5991 X
(without)S 179 x(much)S 179 x(attention)S 179 x(paid)S 179 x(to)S
178 x(making)S 180 x(it)S 179 x(similar)S 178 x(to)S 178 x(existing)S
180 x(servers)S 179 x(in)S 597 y 5991 X(command)S 183 x(syntax.)S
273 x(All)S 183 x(well)S 182 x(and)S 184 x(good,)S 188 x(but)S 183 x
(when)S 183 x(we)S 183 x(Y)S -56 x(anks)S 183 x(saw)S 182 x(what)S
183 x(the)S 598 y 5991 X(MUXSER)S -19 x(VER)S 165 x(could)S 167 x
(do,)S 166 x(we)S 166 x(said)S 166 x("Oooohhh!)S 223 x(W)S -27 x(e)S
166 x(want)S 166 x(one!",)S 168 x(and)S 166 x(the)S 167 x(rest)S
598 y 5991 X(is)S 166 x(History)S -56 x(.)S 23994 Y 5991 X(The)S
128 x(Muxserv)S 2 x(er)S 128 x(consists)S 127 x(of)S 127 x(two)S
127 x(basic)S 127 x(components:)S 203 x(the)S 128 x(Muxserv)S 2 x
(er)S 127 x(100)S 128 x(and)S 598 y 5991 X(the)S 168 x(DECmux2.)S
228 x(The)S 168 x(Muxserv)S 2 x(er)S 168 x(100)S 168 x(is)S 167 x(a)S
168 x(box)S 169 x(about)S 168 x(the)S 168 x(size)S 168 x(of)S 168 x
(a)S 168 x(DEC)S -2 x(200)S 598 y 5991 X(which)S 173 x(attaches)S
173 x(to)S 172 x(the)S 173 x(Ethernet)S 174 x(backbone,)S 175 x(and)S
174 x(has)S 172 x(1)S 173 x(terminal)S 173 x(port)S 173 x(\(yes,)S
598 y 5991 X(1\))S 147 x(for)S 146 x(supervisory)S 148 x(commands.)S
215 x(It)S 146 x(also)S 146 x(has)S 147 x(2)S 147 x("Composit)S -2 x
(e)S 147 x(Link"ports)S 147 x(which)S 597 y 5991 X(can)S 140 x
(connect)S 140 x(to)S 139 x(DEC)S -2 x(mux2)S 140 x(units,)S 145 x
(each)S 140 x(DECmux2)S 138 x(havin)S 2 x(g)S 139 x(8)S 139 x
(terminal)S 139 x(ports.)S 598 y 5991 X(The)S 251 x(Muxserver)S 252 x
(100)S 249 x(can)S 251 x(talk)S 250 x(to)S 250 x(the)S 250 x
(DECmux2')S -19 x(s)S 250 x(either)S 250 x(via)S 251 x(an)S 250 x
(RS232)S 598 y 5991 X(modem)S 184 x(line,)S 190 x(or)S 184 x(a)S
185 x(RS422)S 183 x(long)S 185 x(line)S 185 x(interface.)S 277 x
(Thus)S 185 x(the)S 184 x(DECmux2')S -19 x(s)S 184 x(\(and)S 29901 Y
4796 X F152(2\2036)S 498 x(Personnae)S 167 x(Dramatis)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(the)S 172 x(users\))S 171 x(can)S 172 x(be)S 171 x
(in)S 172 x(a)S 172 x(location)S 171 x(far)S 172 x(from)S 171 x(the)S
172 x(V)S -46 x(ax)S 172 x(and)S 171 x(Ethernet,)S 174 x(and)S 172 x
(they)S 598 y 5991 X(talk)S 166 x(to)S 166 x(the)S 166 x(Muxserv)S
2 x(er)S 166 x(via)S 166 x(MODEM/Phone)S 167 x(lines)S 166 x(or)S
166 x(RS422.)S 6360 Y 5991 X(The)S 248 x(maximum)S 247 x(con\211gur)S
2 x(ation)S 246 x(is)S 247 x(1)S 247 x(Muxserver)S 248 x(and)S 247 x
(2)S 247 x(DECmux2')S -19 x(s.)S 464 x(The)S 598 y 5991 X(DECmux2')S
-19 x(s)S 211 x(can)S 212 x(each)S 212 x(hang)S 213 x(off)S 211 x
(it')S -19 x(s)S 211 x(own)S 212 x(port)S 212 x(on)S 212 x(the)S
211 x(Muxserv)S 2 x(er)S -37 x(,)S 224 x(or)S 211 x(only)S 598 y
5991 X(1)S 199 x(Muxserv)S 2 x(er)S 199 x(port)S 199 x(may)S 200 x
(be)S 199 x(used,)S 208 x(and)S 199 x(the)S 200 x(DEC)S -2 x(mux2')S
-18 x(s)S 199 x("chain")S 200 x(from)S 199 x(each)S 598 y 5991 X
(other)S -36 x(.)S 213 x(Thus,)S 147 x(if)S 140 x(all)S 140 x(16)S
141 x(users)S 140 x(are)S 141 x(in)S 141 x(the)S 141 x(same)S 140 x
(remote)S 140 x(location,)S 147 x(only)S 141 x(1)S 140 x(phone)S
597 y 5991 X(line/modem)S 167 x(set)S 165 x(need)S 167 x(be)S 166 x
(used.)S 10545 Y 5991 X(The)S 142 x(command)S 141 x(structure)S 142 x
(used)S 141 x(on)S 142 x(the)S 141 x(Mux)S 2 x(server)S 141 x(100)S
141 x(is)S 141 x(Unique)S 142 x(\(I'm)S 140 x(being)S 597 y 5991 X
(kind\),)S 305 x(and)S 276 x(the)S 276 x(Muxserv)S 2 x(er)S 276 x
(100)S 276 x(Network)S 276 x(reference)S 277 x(manual)S 277 x
(should)S 276 x(be)S 598 y 5991 X(referenced)S 167 x(for)S 166 x
(exact)S 167 x(syntax.)S 12936 Y 4796 X F28(2.5.1)S 300 x(MUXserver)S
199 x(100/)S 200 x(DECmux2)S 200 x(LED')S -23 x(s)S 14729 Y 5991 X
F151(The)S 144 x(MUXserver100)S 144 x(and)S 144 x(DECmux2)S 143 x
(each)S 145 x(have)S 144 x(1)S 144 x(Green)S 144 x(LED)S 143 x(and)S
144 x(two)S 143 x(Red)S 598 y 5991 X(LED')S -19 x(s.)S 896 y 5991 X
(Green)S 166 x(LED,)S 166 x(power)S 166 x(OK:)S 897 y 5991 X(\201)S
595 x(ON)S 165 x(=)S 166 x(Power)S 166 x(OK)S 897 y 5991 X(\201)S
595 x(OFF)S 166 x(=)S 166 x(\(Y)S -56 x(ou)S 166 x(guessed)S 167 x
(it!\))S 221 x(Power)S 166 x(not)S 166 x(OK)S 896 y 5991 X(Red)S
166 x(LED')S -20 x(s,)S 167 x(Composit)S -2 x(e)S 166 x(port)S 166 x
(A/B)S 166 x(DSR)S 165 x(signal)S 167 x(indicators)S 897 y 5991 X
(\201)S 595 x(ON)S 165 x(=)S 166 x(DSR)S 165 x(Detected)S 166 x
(\(He)S 166 x(sees)S 165 x(the)S 166 x(Modem!\))S 897 y 5991 X(\201)S
595 x(OFF)S 166 x(=)S 166 x(He)S 166 x(doesn')S -10 x(t)S 166 x(see)S
166 x(a)S 166 x(Modem-)S 166 x(It)S 166 x(will)S 165 x(never)S 167 x
(work!)S 896 y 5991 X(The)S 181 x(DSR)S 180 x(LED)S 180 x(has)S 181 x
(no)S 181 x(meaning)S 181 x(if)S 181 x(the)S 180 x(RS422)S 180 x
(port)S 181 x(\(smaller)S 180 x(D-connector\))S 598 y 5991 X(is)S
166 x(being)S 166 x(used.)S 29901 Y 16715 X F152(Personnae)S 167 x
(Dramatis)S 498 x(2\2037)S
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1000 BP 39600 30600 PM 0 0 XY
10574 Y 4796 X F20(Chapte)S -2 x(r)S 897 x(3)S 349 y 4796 X
17928 24 R 11922 Y 4796 X(The)S 298 x(Mothe)S -2 x(r)S 299 x(Load)S
298 x(\(DLL)S -50 x('ing)S 299 x(with)S 299 x(MOM\))S 14712 Y 5991 X
F151(T)S -46 x(o)S 199 x(confuse)S 199 x(the)S 199 x(competition,)S
208 x(the)S 198 x(summary)S 199 x(will)S 198 x(appear)S 199 x(at)S
198 x(the)S 199 x(beginn)S 2 x(ing)S 598 y 5991 X(of)S 166 x(this)S
166 x(section.)S 17103 Y 5991 X(IN)S 158 x(SUMMAR)S -18 x(Y)S -56 x
(,)S 159 x(it)S 158 x(is)S 158 x(NOT)S 159 x(necessary)S 159 x(that)S
159 x(a)S 158 x(V)S -56 x(AX)S 158 x(be)S 159 x(runnin)S 2 x(g)S
159 x(DECN)S -2 x(ET)S 159 x(in)S 598 y 5991 X(order)S 144 x(for)S
143 x(it)S 143 x(to)S 143 x(run)S 144 x(LA)S -27 x(T)S -46 x(.)S
144 x(Users)S 143 x(on)S 144 x(terminal)S 143 x(servers)S 143 x(can)S
144 x(connect)S 144 x(to)S 144 x(the)S 143 x(V)S -46 x(ax)S 598 y
5991 X(just)S 166 x(\211ne,)S 167 x(and)S 166 x(Remote)S 165 x
(print)S 165 x(queues)S 166 x(work)S 166 x(just)S 166 x(ducky)S -54 x
(.)S 221 x(There)S 167 x(need)S 166 x(only)S 166 x(be)S 597 y 5991 X
(at)S 146 x(least)S 146 x(1)S 146 x(node)S 146 x(runn)S 2 x(ing)S
147 x(DEC)S -2 x(NET)S 146 x(SOMEWHERE)S 144 x(on)S 147 x(the)S 147 x
(Ethernet)S 146 x(which)S 598 y 5991 X(is)S 166 x(con\211gu)S 2 x
(red)S 166 x(to)S 166 x(satisfy)S 166 x(T)S -45 x(erminal)S 166 x
(Server)S 167 x(load)S 166 x(requests.)S 223 x(Once)S 166 x(the)S
167 x(servers)S 598 y 5991 X(are)S 203 x(loaded,)S 213 x(DECNET)S
202 x(is)S 203 x(neither)S 204 x(needed)S 203 x(nor)S 204 x(used)S
203 x(by)S 204 x(the)S 203 x(servers.)S 334 x(Now)S -46 x(,)S 598 y
5991 X(the)S 166 x(rest)S 166 x(of)S 166 x(the)S 166 x(story)S -55 x
(.)S 22184 Y 4796 X F24(3.1)S 348 x(The)S 232 x(Rest)S 232 x(of)S
232 x(the)S 233 x(Story)S 23977 Y 5991 X F151(As)S 203 x(explained)S
203 x(in)S 204 x(the)S 203 x(Overview)S 204 x(section,)S 213 x(T)S
-46 x(erminal)S 204 x(Servers)S 204 x(spend)S 203 x(most)S 202 x(of)S
598 y 5991 X(their)S 169 x(lives)S 169 x(talking)S 170 x(LA)S -27 x
(T)S 169 x(protocol.)S 231 x(There)S 169 x(is,)S 170 x(however)S
-36 x(,)S 170 x(one)S 170 x(time)S 168 x(when)S 170 x(they)S 598 y
5991 X(require)S 167 x(that)S 166 x(someone)S 166 x(on)S 166 x(the)S
167 x(Ethernet)S 166 x(talk)S 166 x(DECNE)S -2 x(T)S -45 x(.)S 29901 Y
12360 X F152(The)S 167 x(Mother)S 168 x(Load)S 166 x(\(DLL)S -27 x
('ing)S 166 x(with)S 166 x(MOM\))S 498 x(3\2031)S
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1000 BP 39600 30600 PM 0 0 XY
4050 Y 4796 X F28(3.1.1)S 300 x(Cogito)S 200 x(Ergo)S 199 x
(Checksum)S 5843 Y 5991 X F151(All)S 174 x(terminal)S 175 x
(servers,)S 177 x(regardless)S 175 x(of)S 174 x(model,)S 177 x(are)S
175 x(born)S 175 x(stupid.)S 247 x(At)S 174 x(power)S 174 x(up)S
598 y 5991 X(time,)S 147 x(they)S 142 x(run)S 143 x(their)S 142 x
(Self-Diagnostics)S 141 x(\(Cogito)S 142 x(Ergo)S 142 x(Checksum\),)S
148 x(then)S 142 x(send)S 598 y 5991 X(out)S 166 x(a)S 165 x("load)S
165 x(request")S 166 x(onto)S 166 x(the)S 165 x(Ethernet,)S 167 x
(hoping)S 166 x(some)S 165 x(kind)S 167 x(soul)S 165 x(out)S 166 x
(there)S 598 y 5991 X(is)S 200 x(runnin)S 2 x(g)S 201 x(DECNE)S -2 x
(T)S -45 x(,)S 201 x(and)S 201 x(will)S 200 x(Down)S 200 x(Line)S
201 x(Load)S 201 x(\(DLL\))S 200 x(them)S 201 x(with)S 200 x(their)S
597 y 5991 X(operating)S 167 x(system.)S 10028 Y 5991 X(In)S 166 x
(order)S 167 x(to)S 166 x(service)S 166 x(DECserver)S 166 x(load)S
165 x(requests,)S 167 x(a)S 166 x(node)S 166 x(must)S 166 x(have:)S
896 y 5991 X(1.)S 482 x(DECN)S -2 x(ET)S 166 x(up)S 167 x(and)S 166 x
(runnin)S 2 x(g.)S 897 y 5991 X(2.)S 482 x(SER)S -20 x(VICE)S 145 x
(enabled)S 147 x(on)S 146 x(the)S 147 x(Ethernet)S 146 x(circuit)S
147 x(\(NCP>)S 145 x(SHO)S 146 x(CIRC)S 145 x(UNA-0)S 598 y 6888 X
(CHAR\))S -2 x(.)S 896 y 5991 X(3.)S 482 x(Default)S 165 x(DECNET)S
165 x(account)S 167 x(set)S 165 x(up)S 167 x(\($)S 166 x(DIR)S 165 x
(0""::\).)S 15109 Y 5991 X(At)S 215 x(this)S 216 x(point,)S 229 x
(there)S 216 x(is)S 215 x(a)S 216 x(difference)S 216 x(in)S 216 x
(how)S 216 x(the)S 216 x(two)S 215 x(different)S 216 x("types")S
215 x(of)S 597 y 5991 X(DECservers)S 201 x(load.)S 328 x(One)S 202 x
("type")S 202 x(is)S 201 x(comprised)S 201 x(of)S 202 x(the)S 202 x
(DECs)S -2 x(erver)S 203 x(100,)S 211 x(200,)S 598 y 5991 X(and)S
211 x(Muxserv)S 2 x(er)S -37 x(.)S 356 x(The)S 211 x(other)S 212 x
("type")S 210 x(is)S 211 x(the)S 211 x(PDP1)S -28 x(1)S 211 x(based)S
210 x(server)S -36 x(,)S 223 x(the)S 211 x(ETS)S 598 y 5991 X(and)S
166 x(the)S 167 x(DEC)S -2 x(500.)S 18695 Y 5991 X(The)S 244 x
(\211rst)S 243 x(type)S 243 x(\(100,)S 263 x(200,)S 263 x(Muxserver)S
2 x(\))S 243 x(contain)S 243 x(server)S -8 x(-speci\211c)S 243 x
(node)S 244 x(and)S 598 y 5991 X(port)S 160 x(attributes)S 159 x(in)S
160 x(non-volatile)S 160 x(memory)S 160 x(\(NVRAM\)inside)S 159 x
(the)S 159 x(server)S 161 x(itself.)S 598 y 5991 X(These)S 127 x
(servers)S 128 x(load)S 127 x(down)S 127 x(a)S 127 x("V)S -47 x
(anilla")S 127 x(operating)S 128 x(system.)S 208 x(That)S 128 x(is,)S
135 x(after)S 127 x(they)S 597 y 5991 X(\211nish)S 167 x(self)S 165 x
(test,)S 166 x(these)S 166 x(servers)S 166 x(send)S 166 x(out)S 167 x
(a)S 166 x(load)S 165 x(request)S 166 x(for:)S 897 y 5991 X(\201)S
595 x(All)S 165 x(DECserver)S 166 x(100')S -19 x(s)S 165 x(ask)S
166 x(for)S 167 x(MOM$LOAD:PS0801ENG)S -2 x(.SYS)S 897 y 5991 X
(\201)S 595 x(All)S 165 x(DECserver)S 166 x(200')S -19 x(s)S 165 x
(ask)S 166 x(for)S 167 x(MOM$LOAD:PR0801E)S -2 x(NG.SYS)S 896 y
5991 X(\201)S 595 x(All)S 165 x(Muxserv)S 2 x(er)S 166 x(100')S -19 x
(s)S 166 x(ask)S 166 x(for)S 166 x(MOM$LOAD:MS1601ENG)S -2 x(.SYS)S
897 y 5991 X(So,)S 166 x(in)S 167 x(addition)S 166 x(to)S 166 x(1-3)S
165 x(above,)S 167 x(a)S 166 x(potential)S 166 x(load)S 166 x(host)S
166 x(must)S 166 x(have:)S 897 y 5991 X(a.)S 482 x(MOM$LOAD)S 165 x
(de)S
(\211ned)S 166 x(to)S 166 x(SYS$COMMON:[DE)S -2 x(CSER)S -19 x
(VER].)S 896 y 5991 X(b.)S 482 x(The)S 166 x(requested)S 166 x
(\211le)S 167 x(present)S 166 x(in)S 166 x(MOM$LOAD.)S 29901 Y 4796 X
F152(3\2032)S 498 x(The)S 166 x(Mothe)S 2 x(r)S 166 x(Load)S 166 x
(\(DLL)S -27 x('ing)S 166 x(with)S 167 x(MOM\))S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(The)S 258 x(PDP1)S -27 x(1)S 258 x(Based)S 257 x
(servers)S 258 x(do)S 258 x(NOT)S 257 x(store)S 258 x(server)S 258 x
(and)S 258 x(port)S 258 x(speci\211c)S 258 x(at-)S 598 y 5991 X
(tributes)S 223 x(\(server)S 223 x(name,)S 238 x(port)S 222 x
(access)S 223 x(local/remote,)S 238 x(etc\))S 223 x(in)S 223 x
(NVRAM.)S 222 x(They)S 598 y 5991 X(must)S 115 x(be)S 115 x
(down-line)S 115 x(loaded)S 115 x(with)S 115 x(an)S 115 x(operating)S
116 x(system)S 115 x(which)S 115 x(is)S 115 x(UNIQUE)S 114 x(for)S
598 y 5991 X(each)S 162 x(server)S -36 x(,)S 163 x(and)S 162 x(has)S
162 x(been)S 162 x("tailored")S 161 x(for)S 162 x(each)S 163 x
(server)S 28 x(')S -19 x(s)S 161 x(unique)S 163 x(server/port)S 597 y
5991 X(attributes.)S 215 x(The)S 146 x(DECs)S -2 x(erver)S 147 x
(500)S 146 x(and)S 146 x(ETS)S 145 x(-MUST)S -45 x(-)S 145 x(be)S
146 x(de\211ned)S 147 x(in)S 146 x(the)S 146 x(DEC)S -2 x(-)S 598 y
5991 X(NET)S 126 x(database)S 126 x(of)S 126 x(any)S 127 x(DECNE)S
-2 x(T)S 127 x(node)S 126 x(which)S 127 x(will)S 126 x(be)S 126 x
(expected)S 127 x(to)S 126 x(load)S 126 x(them,)S 598 y 5991 X(as)S
159 x(they)S 160 x(do)S 159 x(not)S 159 x(EXPLICITL)S -46 x(Y)S 158 x
(name)S 160 x(the)S 159 x(\211le)S 159 x(which)S 160 x(they)S 160 x
(want)S 158 x(to)S 159 x(be)S 159 x(loaded)S 598 y 5991 X(with,)S
166 x(as)S 166 x(the)S 166 x(DEC100/200/Muxserver)S 167 x(do.)S
9947 Y 5991 X(If)S 186 x(you)S 187 x("NCP>)S 186 x(Sho)S 187 x(node)S
187 x("ETS_NAME")S 185 x(char")S 187 x(on)S 187 x(a)S 186 x(system)S
186 x(set)S 186 x(up)S 186 x(to)S 186 x(load)S 598 y 5991 X(an)S
183 x(ETS,)S 182 x(you)S 183 x(will)S 181 x(see)S 182 x(that)S 182 x
(the)S 183 x(server)S 183 x(load\211les)S 182 x(are)S 182 x
(EXPLICITL)S -46 x(Y)S 182 x(de\211ned)S 597 y 5991 X(in)S 149 x
(the)S 150 x(DECNE)S -2 x(T)S 150 x(database.)S 215 x(If)S 149 x
(you)S 150 x(look)S 150 x(at)S 148 x(a)S 149 x(DEC500')S -20 x(s)S
149 x(DECNET)S 148 x(database)S 598 y 5991 X(entry)S -54 x(,)S 132 x
(you)S 125 x(will)S 122 x(see)S 124 x(another)S 124 x(difference)S
124 x(between)S 123 x(the)S 124 x(ETS)S 123 x(and)S 124 x(DEC500.)S
207 x(The)S 598 y 5991 X(DEC500)S 170 x(loads)S 171 x(its)S 170 x
(\211le)S 172 x(from)S 171 x(MOM$LOAD,)S 171 x(just)S 171 x(like)S
172 x(the)S 171 x(other)S 172 x(servers.)S 237 x(So)S 598 y 5991 X
(after)S 152 x(a)S 152 x(DEC)S -2 x(500)S 152 x(named)S 152 x(BAMBI)S
151 x(\211nishes)S 152 x(his)S 152 x(self)S 151 x(test,)S 155 x(he)S
152 x(sends)S 152 x(out)S 152 x(a)S 151 x(load)S 597 y 5991 X
(request,)S 139 x(and)S 131 x(if)S 131 x(a)S 131 x(DEC)S -2 x(NET)S
131 x(node)S 132 x(has)S 131 x(the)S 131 x(DEC500)S 130 x(de\211ned)S
131 x(in)S 132 x(his)S 131 x(database,)S 598 y 5991 X(he)S 167 x
(will)S 165 x(attempt)S 165 x(to)S 166 x(load)S 166 x(BAMBI)S 165 x
(with:)S 897 y 5991 X(MOM$LOAD:DS5B)S -2 x(AMBI.SYS)S 897 y 5991 X
(Which)S 167 x(is)S 165 x(a)S 166 x(PDP1)S -27 x(1)S 166 x(image)S
166 x(tailored)S 166 x(for)S 166 x(BAMBI')S -20 x(s)S 166 x(needs.)S
17718 Y 5991 X(The)S 143 x(ETS,)S 143 x(however)S -36 x(,)S 148 x
(is)S 142 x(a)S 143 x(bit)S 142 x(more)S 143 x(primitive.)S 214 x
(After)S 143 x(he)S 143 x(\211nishes)S 143 x(his)S 142 x(self)S 143 x
(test,)S 598 y 5991 X(he)S 167 x(sends)S 165 x(out)S 166 x(a)S 166 x
(request)S 166 x(for)S 167 x(a)S 166 x("primitive")S 165 x
(secondary)S 167 x(load)S 166 x(\211le,)S 167 x(which)S 166 x(is:)S
896 y 5991 X(SYS$SYSTEM:PLUTO2.SYS)S 21005 Y 5991 X(This)S 166 x
(".SYS")S 166 x(\211le)S 166 x(has)S 166 x(just)S 166 x(enoug)S 2 x
(h)S 166 x(intelligence)S 167 x(to)S 166 x(request:)S 897 y 5991 X
(SYS$SYSTEM:PLUTO3.SYS)S 23695 Y 5991 X(PLUTO3.SYS)S 115 x(is)S 114 x
(just)S 116 x(a)S 114 x(bit)S 115 x(further)S 116 x(up)S 115 x(on)S
115 x(the)S 115 x(ETS)S 115 x(evolutionary)S 117 x(ladder)S -37 x(.)S
205 x(The)S 598 y 5991 X(ETS)S 163 x(is)S 164 x(now)S 163 x(smart)S
163 x(enoug)S 2 x(h)S 164 x(to)S 163 x(request)S 164 x(his)S 163 x
("tailored")S 163 x(operating)S 165 x(system.)S 220 x(In)S 598 y
5991 X(the)S 166 x(case)S 166 x(of)S 166 x(an)S 167 x(ETS)S 165 x
(named)S 166 x(ZILLA,)S 167 x(this)S 166 x(\211le)S 166 x(will)S
166 x(be:)S 897 y 5991 X(SYS$COMMON:[PLUTO]ZILLA)S -28 x(TSV)S -65 x
(.SYS)S 27581 Y 5991 X(Y)S -46 x(up,)S 158 x(that')S -19 x(s)S 154 x
(right.)S 219 x(The)S 155 x(ETS)S 155 x(doesn')S -10 x(t)S 155 x
(keep)S 155 x(his)S 155 x(goodies)S 155 x(in)S 155 x(the)S 155 x
(same)S 154 x(place)S 155 x(as)S 598 y 5991 X(the)S 166 x(other)S
167 x(servers.)S 29901 Y 12360 X F152(The)S 167 x(Mother)S 168 x
(Load)S 166 x(\(DLL)S -27 x('ing)S 166 x(with)S 166 x(MOM\))S 498 x
(3)S
(\2033)S
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4125 Y 4796 X F24(3.2)S 348 x(How)S 231 x(did)S 233 x(we)S 232 x
(get)S 232 x(here?)S 5918 Y 5991 X F151(When)S 116 x(we)S 114 x
(install)S 115 x(the)S 115 x(software)S 115 x(for)S 115 x(a)S 115 x
(given)S 116 x(type)S 116 x(of)S 115 x(DECs)S -2 x(erver)S -36 x(,)S
126 x(VMSINST)S -28 x(AL)S 598 y 5991 X(will)S 174 x(create)S 175 x
(the)S 174 x(necessary)S 175 x(directories,)S 177 x(and)S 175 x
(load)S 175 x(into)S 174 x(those)S 175 x(directories)S 174 x(the)S
598 y 5991 X(necessary)S 167 x(\211les.)S 221 x(T)S -45 x(o)S 166 x
(review:)S 897 y 5991 X(\201)S 595 x(DECs)S -2 x(erver)S 167 x(100)S
166 x(MOM$LOAD:PS0801ENG.SYS)S 896 y 5991 X(\201)S 595 x(DECs)S -2 x
(erver)S 167 x(200)S 166 x(MOM$LOAD:PR0801ENG)S -2 x(.SYS)S 897 y
5991 X(\201)S 595 x(MUXserver)S 166 x(100)S 166 x
(MOM$LOAD:MS1601ENG.SYS)S 896 y 5991 X(\201)S 595 x(DECs)S -2 x
(erver)S 167 x(500)S 166 x(MOM$LOAD:DS5TSV)S -66 x(.SYS)S 897 y
5991 X(\201)S 595 x(DECS)S -2 x(A)S 166 x(ETS)S 166 x(SYS$CO)S -2 x
(MMON:[PLUTO]CSVTSV)S -65 x(.SYS)S 13390 Y 5991 X(In)S 169 x(the)S
170 x(case)S 169 x(of)S 169 x(the)S 169 x(DECs)S -2 x(erver)S 171 x
(500)S 169 x(and)S 169 x(ETS,)S 169 x(we)S 169 x(need)S 170 x(to)S
169 x(create)S 169 x("tailored")S 598 y 5991 X(copies)S 279 x(of)S
279 x(the)S 279 x(load)S 278 x(\211les,)S 308 x(unique)S 280 x(to)S
279 x(each)S 279 x(ETS)S 278 x(or)S 280 x(DEC)S -2 x(500.)S 561 x
(The)S 279 x(\211rst)S 598 y 5991 X(step)S 170 x(is)S 169 x(using)S
171 x(DSVCO)S -2 x(NFIG.COM)S 170 x(to)S 170 x(enter)S 170 x(the)S
171 x(servers)S 170 x(into)S 170 x(the)S 171 x(DEC)S -2 x(NET)S 598 y
5991 X(database.)S 416 x(When)S 231 x(we)S 230 x(do)S 231 x(this,)S
248 x(DSVC)S -2 x(ONFIG)S 230 x(will)S 230 x(automatically)S 231 x
(make)S 231 x(a)S 597 y 5991 X(copy)S 149 x(of)S 149 x(the)S 149 x
("vanilla")S 149 x(load)S 148 x(\211le)S 149 x(and)S 149 x(make)S
149 x(it)S 148 x(node)S 149 x(speci\211c)S 149 x(\(DS5BAMBI)S -2 x
(.SYS)S 598 y 5991 X(or)S 186 x(ZILLA)S -27 x(TSV)S -65 x(.SYS,)S
186 x(as)S 185 x(above\).)S 280 x(For)S 186 x(more)S 186 x(info)S
185 x(on)S 186 x(how)S 185 x(DSVCONFIG)S 184 x(does)S 598 y 5991 X
(this,)S 166 x(refer)S 167 x(to)S 166 x(the)S 166 x(software)S 165 x
(installation)S 165 x(guides)S 167 x(for)S 166 x(the)S 166 x(server)S
-36 x(.)S 18770 Y 5991 X(Now)S 227 x(that)S 228 x(we)S 228 x(have)S
228 x(uniquely)S 229 x(named)S 228 x(load)S 228 x(\211les)S 228 x
(for)S 228 x(each)S 228 x(server)S 229 x(\(ETS)S 227 x(or)S 598 y
5991 X(DEC500\))S 206 x(that)S 207 x(we)S 207 x(want)S 207 x(to)S
207 x(be)S 207 x(able)S 207 x(to)S 207 x(load,)S 218 x(we)S 207 x
(need)S 208 x(to)S 207 x(customize)S 206 x(those)S 598 y 5991 X
(\211les)S 161 x(for)S 162 x(unique)S 162 x(server)S 162 x
(attributes.)S 220 x(T)S -46 x(o)S 161 x(do)S 162 x(this,)S 162 x
(we)S 161 x(can)S 162 x(use)S 161 x(TSM)S 162 x(\(T)S -46 x(erminal)S
597 y 5991 X(Server)S 167 x(Manager)S -36 x(,)S 167 x(an)S 166 x
(optional)S 166 x(software)S 165 x(product\),)S 167 x(or:)S 897 y
5991 X(\201)S 595 x(For)S 166 x(the)S 166 x(ETS,)S 167 x(SYS$CO)S
-2 x(MMON:[PLUTO]TSVCFG.EXE)S 897 y 5991 X(\201)S 595 x(For)S 166 x
(the)S 166 x(DEC500,)S 166 x(MOM$LOAD:DS5)S -2 x(CFG.EXE)S 24150 Y
5991 X(For)S 293 x(explicit)S 293 x(examples)S 292 x(of)S 292 x
("CFG")S 292 x(program)S 293 x(usage,)S 325 x(refer)S 293 x(to)S
292 x(the)S 292 x(Server)S 598 y 5991 X(Management)S 167 x(Guide)S
166 x(for)S 166 x(the)S 166 x(respective)S 167 x(server)S -36 x(.)S
29901 Y 4796 X F152(3\2034)S 498 x(The)S 166 x(Mothe)S 2 x(r)S 166 x
(Load)S 166 x(\(DLL)S -27 x('ing)S 166 x(with)S 167 x(MOM\))S
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4104 Y 4796 X F24(3.3)S 348 x(T)S -39 x(roubleshooting)S 233 x
(Downline)S 232 x(Load)S 232 x(problems)S 896 y 5991 X F151(See)S
219 x(the)S 219 x("Downline)S 219 x(Loading)S 220 x(Cheat)S 219 x
(Sheet")S 219 x(for)S 219 x(a)S 219 x(list)S 218 x(potential)S 219 x
(Dll)S 218 x(prob-)S 598 y 5991 X(lems/solutions.)S 29901 Y 12360 X
F152(The)S 167 x(Mother)S 168 x(Load)S 166 x(\(DLL)S -27 x('ing)S
166 x(with)S 166 x(MOM\))S 498 x(3\2035)S
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10574 Y 4796 X F20(Chapte)S -2 x(r)S 897 x(4)S 349 y 4796 X
17928 24 R 11922 Y 4796 X(Remote)S 297 x(Print)S 299 x(Queue)S -2 x
(s)S 14712 Y 5991 X F151(Calls)S 123 x(dealing)S 125 x(with)S 123 x
(the)S 124 x(setup)S 124 x(and)S 124 x(troubleshooting)S 125 x(of)S
124 x(Remote)S 123 x(Print)S 124 x(Queues)S 598 y 5991 X(\(RPQs\))S
222 x(are)S 224 x(by)S 224 x(far)S 223 x(the)S 224 x(most)S 223 x
(common)S 223 x(calls)S 223 x(logge)S 2 x(d)S 223 x(with)S 223 x
(server)S 224 x(support.)S 597 y 5991 X(They)S 173 x(are)S 172 x
(also)S 171 x(\(usually\))S 173 x(the)S 172 x(easiest)S 171 x(to)S
171 x(\211x.)S 240 x(Let')S -18 x(s)S 171 x(examine)S 173 x(what')S
-19 x(s)S 171 x(involved)S 598 y 5991 X(in)S 166 x(a)S 166 x(RPQ.)S
17716 Y 4796 X F36(Figure)S 167 x(4\2031:)S 498 x(Components)S 167 x
(of)S 166 x(a)S 166 x(Remote)S 166 x(Print)S 167 x(Queue)S 18812 Y
5065 X F98(PRINTER)S 806 x(BC22D)S 10713 X(SERVER)S 13403 X(SERVER)S
17976 X(LTA)S 269 x(DEVICE)S 538 x(SYMBIONT)S 498 y 7754 X(CABLE)S
10982 X(PORT)S 13134 X("DSRV57")S 498 y 4796 X(---------)S 10444 X
("PORT_7")S 498 y 4796 X(|)S 6947 X(|)S 10175 X(------------------)S
17976 X(--------------------)S 498 y 4796 X(|)S 268 x(LN03)S 538 x
(|==========|)S 538 x(DECserver)S 269 x(200)S 807 x(|)S 17707 X(|)S
19321 X(Host)S 269 x(CPU)S 23356 X(|)S 499 y 4796 X(|)S 6947 X(|)S
9906 X(|)S 12327 X(|)S 15017 X(|)S 17707 X(|)S 20397 X(|)S 23356 X
(|)S 498 y 4796 X(---------)S 10175 X(------------------)S 17976 X
(--------------------)S 498 y 12327 X(|)S 20397 X(|)S 498 y 4796 X
(===================================================================)S
498 y 14479 X(ETHERNET)S 269 x(CABLE)S 25387 Y 5991 X F151(Let')S
-19 x(s)S 143 x(say)S 143 x(we)S 142 x(have)S 144 x(a)S 142 x(LN03)S
143 x(on)S 143 x(a)S 143 x(DECserver)S 142 x(200)S 143 x(which)S
143 x(we)S 143 x(want)S 142 x(to)S 143 x(print)S 142 x(to)S 598 y
5991 X(from)S 185 x(two)S 184 x(different)S 185 x(V)S -46 x(axen)S
185 x(on)S 185 x(the)S 185 x(Ethernet.)S 279 x(There)S 186 x(are)S
184 x(two)S 185 x(basic)S 184 x(aspects)S 598 y 5991 X(involved)S
219 x(in)S 217 x(the)S 218 x(setup)S 217 x(of)S 217 x(a)S 217 x(LA)S
-27 x(T)S -46 x(-based)S 217 x(print)S 218 x(queue:)S 325 x(the)S
218 x(server)S 217 x(and)S 218 x(the)S 597 y 5991 X(host)S 166 x
(cpu.)S 29901 Y 16558 X F152(Remote)S 166 x(Print)S 167 x(Queues)S
499 x(4\2031)S
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4125 Y 4796 X F24(4.1)S 348 x(Server)S 232 x(Attributes)S 5918 Y
5991 X F151(Throug)S 2 x(hout)S 179 x(this)S 179 x(section,)S 183 x
(you)S 180 x(may)S 179 x(wish)S 179 x(to)S 179 x(reference)S 180 x
(the)S 179 x(DECs)S -2 x(erver)S 180 x(200)S 598 y 5991 X(Mgmt.)S
277 x(guide,)S 189 x(V2.0,)S 190 x(sec.)S 276 x(7,)S 189 x(ppg)S
184 x(25-30,)S 189 x("A)S 184 x(printer)S 184 x(con\211g)S 2 x(ured)S
184 x(for)S 185 x(queued)S 598 y 5991 X(connection)S 167 x
(requests.)S 8907 Y 5991 X(The)S 184 x(port)S 183 x(to)S 183 x
(which)S 183 x(we)S 183 x(have)S 184 x(attached)S 183 x(the)S 184 x
(LN03)S 183 x(must)S 183 x(have)S 184 x(the)S 183 x(following)S 598 y
5991 X(attributes:)S 197 x(access)S 117 x(remote,)S 127 x(autobaud)S
118 x(disabled,)S 126 x(dedicated)S 117 x(none,)S 129 x(and)S 117 x
(a)S 117 x(baud)S 598 y 5991 X(rate,)S 183 x(character)S 180 x
(size,)S 182 x(parity)S -55 x(,)S 183 x(and)S 180 x(\212ow)S 179 x
(control)S 180 x(\(usually)S 180 x(xon\))S 180 x(matching)S 180 x
(the)S 597 y 5991 X(setup)S 234 x(on)S 234 x(the)S 234 x(printer)S
-36 x(.)S 425 x(The)S 235 x(port)S 234 x(must)S 233 x(also)S 234 x
(have)S 234 x(at)S 234 x(least)S 233 x(1)S 234 x(group)S 235 x(code)S
598 y 5991 X(enabled)S 242 x(which)S 243 x(matches)S 242 x(the)S
242 x(group)S 243 x(codes)S 242 x(enabled)S 242 x(\(group)S 243 x(0)S
242 x(by)S 243 x(default\))S 598 y 5991 X(on)S 179 x(the)S 178 x
(host)S 178 x(cpu.)S 259 x(It)S 177 x(is)S 178 x(also)S 178 x
(necessary)S 179 x(at)S 178 x(this)S 177 x(time)S 178 x(to)S 178 x
(note)S 179 x(the)S 178 x(port)S 178 x(name)S 598 y 5991 X
(\(Local>SHO)S 127 x(PORT)S -28 x(;)S 128 x(by)S 128 x(default)S
128 x(PORT_x,)S 136 x(where)S 128 x(x)S 128 x(is)S 127 x(the)S 128 x
(port)S 127 x(#\).)S 209 x(If)S 127 x(desired,)S 598 y 5991 X(the)S
185 x(customer)S 184 x(can)S 185 x(get)S 185 x(creative,)S 190 x
(naming)S 185 x(the)S 185 x(port)S 184 x(the)S 185 x(same)S 183 x
(as)S 184 x(the)S 185 x(queue,)S 597 y 5991 X(or)S 166 x("LASER1",)S
165 x(or)S 167 x(whatever)S -37 x(.)S 15483 Y 5991 X(On)S 290 x(the)S
291 x(server)S 290 x(itself,)S 321 x(we)S 290 x(need)S 291 x(to)S
290 x(make)S 291 x(note)S 290 x(of)S 290 x(the)S 291 x(NAME.)S 290 x
(On)S 290 x(the)S 597 y 5991 X(DECserver)S 269 x(200,)S 296 x(the)S
270 x(NAME)S 269 x(\211eld)S 269 x(is)S 269 x(on)S 270 x(the)S 270 x
(second)S 270 x(line)S 270 x(down)S 269 x(on)S 270 x(the)S 598 y
5991 X("Local>)S 189 x(SHO)S 189 x(SER)S -20 x(VER")S 188 x(display)S
-55 x(.)S 291 x(The)S 190 x(customer)S 190 x(usually)S 189 x(gives)S
190 x(the)S 190 x(server)S 598 y 5991 X(a)S 174 x(name,)S 176 x
(which)S 174 x(MUST)S 174 x(be)S 173 x(unique)S 175 x(among)S 174 x
(all)S 174 x(servers)S 174 x(on)S 174 x(the)S 174 x(ETHERNE)S -2 x
(T)S -45 x(.)S 598 y 5991 X(Having)S 178 x(two)S 176 x(servers)S
176 x(with)S 176 x(the)S 177 x(same)S 176 x(name)S 177 x(will)S 176 x
(de)S
(\211nitely)S 177 x(complicate)S 176 x(your)S 597 y 5991 X(life,)S
164 x(and)S 163 x(give)S 164 x(very)S 165 x(strange)S 163 x
(symptoms,)S 164 x(as)S 162 x(we)S 163 x(will)S 162 x(see)S 163 x
(later)S -37 x(.)S 221 x(By)S 163 x(default,)S 164 x(if)S 598 y
5991 X(the)S 181 x(customer)S 182 x(does)S 180 x(not)S 182 x
(specify)S 181 x(a)S 181 x(name,)S 186 x(the)S 181 x("Low)S 181 x
(end")S 181 x(DECs)S -2 x(ervers)S 182 x(\(100,)S 598 y 5991 X(200,)S
245 x(and)S 229 x(MUXserver\))S 229 x(will)S 229 x(default)S 228 x
(to)S 229 x(a)S 229 x(name)S 229 x(of)S 229 x(LA)S -28 x
(T_08002BXXXXXX)S 598 y 5991 X(\(LA)S -28 x(T_the_ethern)S 2 x
(et_address\))S 149 x(to)S 150 x(assure)S 150 x(a)S 150 x(unique)S
151 x(server)S 151 x(name.)S 217 x(The)S 151 x("High)S 597 y 5991 X
(end")S 201 x(servers)S 201 x(\(ETS,)S 200 x(DEC500\))S 200 x(leave)S
201 x(the)S 201 x(name)S 201 x(\211eld)S 200 x(blank,)S 211 x(and)S
201 x(a)S 200 x(unique)S 598 y 5991 X(name)S 264 x(MUST)S 265 x(be)S
264 x(given)S 265 x(the)S 265 x(server)S 265 x(before)S 264 x(it)S
264 x(will)S 263 x(accept)S 265 x(Host-Initiat)S -2 x(ed)S 598 y
5991 X(Connections)S 166 x(\(HIC')S -19 x(s.\))S 23552 Y 4796 X F24
(4.2)S 348 x(A)S 232 x(Host)S 232 x(System)S 232 x(Perspective)S
25346 Y 5991 X F151(Throug)S 2 x(hout)S 204 x(this)S 203 x(section)S
203 x(you)S 205 x(may)S 203 x(wish)S 203 x(to)S 204 x(reference)S
204 x(your)S 205 x(on-line)S 203 x(copies)S 597 y 5991 X(of)S 216 x
(SYS$MANAGE)S -2 x(R:L)S -27 x(TLOAD.COM)S 216 x(and)S 217 x
(REMOTE_PR)S -2 x(INT)S -45 x(.COM,)S 216 x(or)S 217 x(the)S 598 y
5991 X(examples)S 166 x(of)S 166 x(these)S 166 x(\211les)S 166 x(on)S
166 x(pages)S 167 x(5-4)S 165 x(and)S 167 x(6-3,)S 166 x(VMS)S 166 x
(4.6)S 166 x(release)S 166 x(notes.)S 29901 Y 4796 X F152(4\2032)S
498 x(Remote)S 166 x(Print)S 167 x(Queues)S
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3969 Y 5991 X F151(The)S 123 x(commands)S 121 x(illustrated)S 121 x
(below)S 122 x(need)S 122 x(to)S 122 x(be)S 122 x(issued)S 121 x(on)S
122 x(every)S 124 x(system)S 121 x(which)S 598 y 5991 X(will)S 190 x
(run)S 191 x(a)S 190 x(print)S 191 x(queue)S 191 x(to)S 190 x(this)S
190 x(LN03.)S 296 x(It)S 189 x(is)S 190 x(not)S 191 x(necessary)S
191 x(that)S 190 x(the)S 191 x(same)S 598 y 5991 X(L)S -27 x(T)S
-27 x(A#)S 191 x(be)S 192 x(used)S 192 x(on)S 192 x(each)S 192 x
(system,)S 199 x(only)S 192 x(that)S 192 x(the)S 192 x(L)S -27 x(T)S
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(order)S 303 x(to)S 302 x(utilize)S 303 x(a)S 302 x(server)S -8 x
(-based)S 302 x(printer)S 303 x(from)S 303 x(any)S 303 x(V)S -46 x
(ax,)S 338 x(it)S 302 x(is)S 302 x(\211rst)S 598 y 5991 X(necessary)S
165 x(to)S 164 x(create)S 164 x(a)S 165 x(L)S -27 x(T)S -28 x(A)S
164 x(port)S 165 x(on)S 164 x(the)S 165 x(V)S -46 x(ax)S 164 x
(which)S 165 x(is)S 164 x(mapped)S 164 x(to)S 164 x(a)S 164 x
(speci\211c)S 597 y 5991 X(port)S 157 x(or)S 157 x(service)S 157 x
(on)S 157 x(a)S 156 x(speci\211c)S 157 x(server)S -36 x(.)S 219 x
(This)S 157 x(is)S 156 x(done)S 157 x(with)S 156 x(the)S 157 x(LA)S
-28 x(TCP)S 157 x("create)S 598 y 5991 X(port")S 215 x(and)S 216 x
("set)S 215 x(port")S 216 x(commands,)S 228 x(usually)S 217 x(in)S
216 x(L)S -27 x(TLOAD.COM,)S 215 x(so)S 215 x(that)S 216 x(the)S
598 y 5991 X(ports)S 166 x(are)S 166 x(created)S 166 x(every)S 167 x
(time)S 166 x(the)S 166 x(system)S 166 x(is)S 165 x(rebooted.)S
11740 Y 5991 X(First,)S 252 x(let')S -19 x(s)S 234 x(\211nd)S 235 x
(an)S 235 x(unused)S 235 x(L)S -27 x(T)S -27 x(A)S 234 x(port)S 235 x
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(to)S 598 y 5991 X(customers)S 114 x(that)S 114 x(they)S 114 x
(create)S 114 x(their)S 115 x(application)S 113 x(ports)S 114 x
(starting)S 114 x(with)S 114 x(L)S -28 x(T)S -27 x(A9900:)S 598 y
5991 X(to)S 232 x(make)S 232 x(them)S 232 x(easy)S 233 x(to)S 232 x
(differentiate)S 231 x(from)S 232 x(Interactive)S 233 x(ports,)S
249 x(which)S 232 x(will)S 597 y 5991 X(always)S 166 x(start)S 165 x
(with)S 166 x(the)S 166 x(lowest)S 165 x(available)S 166 x(L)S -27 x
(T)S -27 x(A#.)S 897 y 5991 X(LCP>)S 166 x(SHO)S 165 x(PORT)S 166 x
(L)S -27 x(T)S -27 x(A9900:)S 897 y 5991 X(%LA)S -28 x(T)S -45 x
(-E-NOTER)S -2 x(MS)S 167 x(no)S 166 x(such)S 167 x(terminal\(s\))S
165 x(\(or)S 166 x(some)S 166 x(such)S 166 x(message\))S 17120 Y
5991 X(The)S 281 x(above)S 281 x(tells)S 280 x(us)S 281 x(that)S
280 x(L)S -27 x(T)S -27 x(A9900)S 280 x(has)S 280 x(not)S 281 x(yet)S
281 x(been)S 281 x(mapped,)S 309 x(and)S 281 x(is)S 598 y 5991 X
(available)S 166 x(to)S 166 x(us.)S 896 y 5991 X(LCP>)S 166 x(CREA)S
-29 x(TE)S 166 x(PORT)S 166 x(L)S -27 x(T)S -27 x(A9900:)S 221 x
(\(this)S 166 x(creates)S 166 x(the)S 166 x(port\))S 897 y 5991 X
(LCP>)S 166 x(SET)S 166 x(PORT)S 166 x(L)S -28 x(T)S -27 x
(A9900:/APPL/)S 2 x(NODE)S -2 x(=DSR)S -19 x(V57/PORT=PORT_7)S 21304 Y
5991 X(This)S 206 x("set)S 205 x(port")S 206 x(command)S 206 x
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(application)S 205 x(port)S 206 x(to)S 598 y 5991 X(port)S 196 x(7)S
196 x(on)S 196 x(our)S 196 x(DECserver)S 196 x(200)S 195 x
(diagrammed)S 196 x(above.)S 312 x(It)S 196 x(is)S 195 x(also)S 195 x
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117 x(a)S 117 x(speci\211c)S 117 x(port.)S 598 y 5991 X(Let')S -19 x
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(had)S 171 x(a)S 171 x(local)S 170 x(service)S 171 x(named)S 171 x
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190 x(ports)S 191 x(1-4)S 191 x(on)S 191 x(the)S 191 x(DECs)S -2 x
(erver)S -35 x(,)S 197 x(and)S 191 x(had)S 191 x(LN03')S -18 x(s)S
190 x(connec)S 2 x(ted)S 598 y 5991 X(to)S 223 x(all)S 223 x(four)S
223 x(ports.)S 393 x(Perhaps)S 223 x(all)S 223 x(four)S 224 x(LN03')S
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(room,)S 238 x(and)S 598 y 5991 X(the)S 193 x(users)S 192 x(don')S
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(to)S 145 x(this)S 145 x(particular)S 145 x(queue)S 146 x(is)S 145 x
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(the)S 166 x(above)S 167 x(SET)S 166 x(PORT)S 165 x(command,)S 167 x
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3969 Y 5991 X F151(Then)S 212 x(any)S 212 x(print)S 211 x(jobs)S
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177 x(which)S 177 x(will)S 175 x(print)S 176 x(to)S 177 x(this)S
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155 x(queue.)S 220 x(W)S -19 x(ithout)S 155 x(this)S 155 x
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191 x(processing,)S 196 x(the)S 190 x(job)S 190 x(will)S 189 x(go)S
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215 x(Ethernet,)S 227 x(and)S 215 x(that)S 214 x(message)S 214 x
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3969 Y 5991 X F151(please)S 205 x(initiate)S 205 x(a)S 205 x
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3969 Y 5991 X F151(DECserver\),)S 152 x(then)S 150 x(the)S 149 x
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136 x(command)S 137 x(on)S 136 x(the)S 137 x(DECs)S -2 x(erver)S
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5991 X(when)S 282 x(the)S 281 x(queue)S 283 x(is)S 280 x
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281 x(to)S 281 x(PRTSYM)S 281 x(as)S 281 x(a)S 598 y 5991 X
(processor)S -37 x(.)S 12472 Y 5991 X(If)S 266 x(most)S 266 x(RPQs)S
265 x(on)S 267 x(the)S 267 x(system)S 266 x(are)S 266 x(working)S
268 x(\211ne,)S 293 x(but)S 266 x(any)S 267 x(new)S 267 x(queues)S
598 y 5991 X(you)S 229 x(create)S 228 x(go)S 229 x("STOPPED")S 227 x
(as)S 227 x(soon)S 228 x(as)S 228 x(you)S 229 x(print)S 228 x(to)S
228 x(them,)S 244 x(perhaps)S 228 x(the)S 598 y 5991 X(Symbiont)S
240 x(has)S 241 x("reached)S 240 x(its)S 240 x(limit".)S 443 x(T)S
-30 x(ry)S 241 x(making)S 241 x(a)S 240 x(copy)S 241 x(of)S 240 x
(LA)S -28 x(TSYM)S 241 x("$)S 597 y 5991 X(COPY)S 265 x(LA)S -27 x
(TSYM.EXE)S 266 x(LA)S -28 x(TSYM_1.EXE")S 266 x(and)S 266 x(using)S
267 x(LA)S -27 x(TSYM_1)S 266 x(as)S 266 x(the)S 598 y 5991 X
(processor)S 277 x(in)S 278 x(the)S 277 x("INIT/QUEUE")S 276 x
(command,)S 306 x(forcing)S 278 x(the)S 277 x(creation)S 278 x(of)S
277 x(a)S 598 y 5991 X(second)S 259 x(LA)S -27 x(T)S 259 x(Symbiont)S
259 x(process.)S 500 x(If)S 259 x(this)S 258 x(works,)S 283 x(and)S
259 x(the)S 259 x(customer)S 259 x(has)S 598 y 5991 X(version)S 130 x
(2.4)S 130 x(or)S 130 x(later)S 129 x(of)S 129 x(LA)S -27 x(TSYM,)S
130 x(then)S 130 x(the)S 129 x(logical)S 130 x(LA)S -27 x(T$SYMP)S
-37 x(ARAMETER)S 597 y 5991 X(can)S 237 x(be)S 236 x(used)S 236 x
(to)S 236 x(limit)S 236 x(the)S 236 x(#)S 237 x(of)S 236 x(queues)S
236 x(initialized)S 236 x(per)S 236 x(symbiont)S 237 x(process)S
598 y 5991 X(\($)S 228 x(DEFINE/SYS)S -2 x(/EXEC)S 227 x(LA)S -27 x
(T$SYMP)S -37 x(AR)S 227 x(AMETER)S 227 x(16\).)S 407 x(Remember)S
-37 x(,)S 244 x(this)S 598 y 5991 X(parameter)S 170 x(is)S 169 x
(examined)S 171 x(only)S 171 x(when)S 170 x(a)S 170 x(queue)S 171 x
(is)S 170 x(started,)S 170 x(and)S 171 x(thus)S 170 x(must)S 169 x
(be)S 598 y 5991 X(de\211ned)S 167 x(prior)S 166 x(to)S 166 x
(REMOTE_PRINT)S -47 x(.COM)S 166 x(execution.)S 19944 Y 4796 X F24
(5.6)S 348 x(Exceeded)S 231 x(Quota?)S 310 x(What)S 233 x(Quota?)S
21737 Y 5991 X F151(Recently)S 140 x(a)S 139 x("new")S 138 x(error)S
140 x(has)S 139 x(come)S 139 x(to)S 139 x(light.)S 213 x(During)S
140 x(queue)S 140 x(initialization,)S 144 x(an)S 598 y 5991 X
("Exceeded)S 204 x(quota")S 203 x(error)S 204 x(message)S 203 x(is)S
203 x(received,)S 214 x(and)S 203 x(the)S 204 x(Symbiont)S 204 x
(process)S 598 y 5991 X(dies,)S 148 x(killing)S 145 x(all)S 143 x
(queues.)S 215 x(No)S 144 x(one)S 144 x(is)S 143 x(quite)S 144 x
(sure)S 144 x(which,)S 149 x(if)S 143 x(any)S -54 x(,)S 148 x(quota)S
144 x(is)S 143 x(being)S 598 y 5991 X(exceeded.)S 223 x(What)S 165 x
(you)S 167 x(need)S 167 x(to)S 166 x(do:)S 896 y 5991 X(1.)S 482 x
(Set)S 206 x(LA)S -28 x(T$SYMP)S -36 x(ARAMETER)S 205 x(to)S 206 x
(1,)S 217 x(so)S 207 x(each)S 207 x(queue)S 207 x(gets)S 207 x(its)S
206 x(own)S 206 x(sym-)S 598 y 6888 X(biont)S 208 x(process.)S 350 x
(If)S 208 x(the)S 209 x(version)S 210 x(of)S 209 x(LA)S -28 x(TSYM)S
209 x(on)S 209 x(the)S 209 x(system)S 208 x(is)S 208 x(pre-2.4,)S
598 y 6888 X(unique)S 194 x(copies)S 193 x(of)S 193 x(LA)S -28 x
(TSYM.EXE)S 193 x(must)S 193 x(be)S 193 x(used)S 193 x(by)S 194 x
(each)S 193 x(queue,)S 202 x(to)S 193 x(at-)S 598 y 6888 X(tain)S
166 x(the)S 166 x(same)S 166 x(effect.)S 896 y 5991 X(2.)S 482 x
(Start)S 186 x(the)S 187 x(queues)S 187 x(one)S 187 x(at)S 186 x(a)S
187 x(time.)S 283 x(Chances)S 187 x(are,)S 192 x(only)S 187 x(1)S
187 x(queue)S 187 x(will)S 186 x(die)S 598 y 6888 X(with)S 177 x
(the)S 178 x("EXCE)S -2 x(EDED)S 176 x(QUOT)S -28 x(A")S 177 x
(error)S -36 x(.)S 257 x(The)S 178 x(other)S 178 x(queues,)S 181 x
(each)S 179 x(with)S 598 y 6888 X(its)S 165 x(own)S 166 x(Symbiont)S
166 x(process,)S 167 x(will)S 165 x(merrily)S 166 x(continue)S 168 x
(running)S 2 x(.)S 29901 Y 4796 X F152(5\2038)S 498 x(T)S -44 x
(roubleshooting)S 168 x(Remote)S 167 x(Print)S 167 x(Queues)S
PP
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%%DOC$Page: 5-9 43
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(3.)S 482 x(Find)S 255 x(the)S 255 x(DECserver)S
255 x(pointed)S 255 x(to)S 255 x(by)S 255 x(the)S 255 x(L)S -27 x(T)S
-27 x(A#)S 255 x(used)S 255 x(on)S 255 x(the)S 255 x("Dead")S 598 y
6888 X(queue.)S 429 x(In)S 236 x(one)S 235 x("EXQUO)S -2 x(T)S -27 x
(A")S 235 x(case,)S 252 x(power)S 235 x(cycling)S 237 x(the)S 235 x
(DECSA)S 233 x(\211xed)S 598 y 6888 X(the)S 190 x(problem.)S 293 x
(In)S 190 x(another)S -36 x(,)S 197 x(the)S 190 x(DECs)S -2 x(erver)S
191 x(200')S -19 x(s)S 190 x(tranceiver)S 191 x(cable)S 190 x(had)S
598 y 6888 X(come)S 119 x(loose,)S 128 x(and)S 120 x(it)S 118 x
(failed)S 119 x(self-test)S -2 x(.)S 207 x(T)S -13 x(ightenin)S 2 x
(g)S 119 x(the)S 119 x(cable,)S 129 x(and)S 119 x(reloading)S 597 y
6888 X(the)S 164 x(DEC200)S 163 x(\211xed)S 166 x(the)S 164 x
("EXQUO)S -2 x(T)S -27 x(A")S 164 x(error)S -36 x(.)S 221 x(In)S
165 x(short,)S 165 x(look)S 165 x(for)S 164 x(a)S 164 x(Server)S
598 y 6888 X(problem)S 166 x(of)S 166 x(some)S 165 x(kind)S 167 x
(if)S 166 x(you)S 167 x(see)S 166 x(this)S 165 x(error)S -36 x(.)S
8453 Y 4796 X F24(5.7)S 348 x(Everybody')S -27 x(s)S 233 x(doin')S
232 x(it)S 10246 Y 5991 X F151(If)S 226 x(MUL)S -27 x(TIPLE)S 227 x
(or)S 227 x(ALL)S 226 x(RPQs)S 226 x(on)S 227 x(this)S 226 x(system)S
226 x(are)S 227 x(not)S 226 x(working,)S 243 x(then)S 228 x("$)S
598 y 5991 X(Sho)S 191 x(Sys")S 191 x(and)S 191 x(look)S 192 x(for)S
191 x(the)S 191 x(SYMBIO)S -2 x(NT)S 192 x(process.Is)S 190 x(it)S
191 x(in)S 191 x(COM)S 190 x(or)S 191 x(R)S -18 x(W)S -46 x(AST)S
597 y 5991 X(states?)S 218 x(Compare)S 157 x(the)S 157 x(version)S
159 x(of)S 157 x(LA)S -27 x(TSYM)S 157 x(and)S 158 x(L)S -27 x
(TDRIV)S -2 x(ER)S 157 x(on)S 158 x(the)S 158 x(system)S 598 y 5991 X
(against)S 153 x(the)S 154 x(revision)S 154 x(chart)S 153 x(at)S
153 x(the)S 154 x(end)S 153 x(of)S 154 x(this)S 153 x(section)S 153 x
(for)S 153 x(known)S 154 x(problems.)S 598 y 5991 X(Also,)S 181 x(a)S
179 x("$)S 178 x(Sho)S 179 x(queue/dev")S 180 x(will)S 177 x(show)S
179 x(you)S 179 x(if)S 178 x(more)S 179 x(than)S 179 x(1)S 178 x
(queue)S 179 x(has)S 179 x(been)S 598 y 5991 X(initialized)S 247 x
(pointing)S 248 x(to)S 247 x(the)S 247 x(same)S 247 x(L)S -27 x(T)S
-27 x(A)S 246 x(device,)S 269 x(which)S 248 x(will)S 246 x(R)S -19 x
(W)S -46 x(AST)S 247 x(your)S 597 y 5991 X(symbiont)S 212 x
(licketty)S 212 x(splitly)S -56 x(.)S 358 x(If)S 211 x(there)S 212 x
(is)S 211 x(only)S 213 x(1)S 211 x(RPQ)S 211 x(per)S 212 x(L)S -27 x
(T)S -27 x(A)S 211 x(device,)S 224 x(then)S 598 y 5991 X(check)S
193 x(the)S 192 x(versions)S 192 x(of)S 192 x(LA)S -28 x(TSYM/L)S
-26 x(TDRIVE)S -2 x(R)S 192 x(against)S 191 x(the)S 192 x(BUGCHART)S
191 x(at)S 598 y 5991 X(the)S 166 x(end)S 167 x(of)S 166 x(this)S
165 x(section.)S 16821 Y 5991 X(Y)S -56 x(ou)S 167 x(can)S 166 x
(also)S 166 x(use)S 166 x(SDA)S 165 x(to)S 166 x(help)S 166 x
(troubleshoot)S 167 x(Symbiont)S 166 x(process)S 166 x(problems.)S
897 y 5991 X(\201)S 595 x($)S 166 x(ANAL/SYS)S 896 y 5991 X(\201)S
595 x(SDA>)S 165 x(SHO)S 165 x(SUMM)S 166 x(!)S 167 x(to)S 166 x
(\211nd)S 166 x(index)S 167 x(#)S 166 x(of)S 166 x(symbiont)S 166 x
(process)S 897 y 5991 X(\201)S 595 x(SDA>)S 129 x(SET)S 131 x
(PROC/INDE)S -2 x(X=XX)S 130 x(!)S 131 x(XX)S 130 x(=)S 131 x(the)S
131 x(index)S 131 x(#)S 131 x(of)S 131 x(Symbiont)S 131 x(process)S
897 y 5991 X(\201)S 595 x(SDA>)S 186 x(SHO)S 186 x(PROC/CHAN)S 187 x
(!)S 187 x(see)S 187 x(what)S 187 x(devices)S 188 x(are)S 187 x
(being)S 188 x(used)S 188 x(-)S 187 x(L)S -27 x(T)S -27 x(A#)S 597 y
6888 X(busy?)S 897 y 5991 X(\201)S 595 x(SDA>)S 213 x(SHO)S 214 x
(DEV)S 214 x(L)S -27 x(T)S -27 x(AXX)S 213 x(!)S 216 x(look)S 215 x
(at)S 214 x(device)S 216 x(UCB-)S 214 x(busy)S -55 x(,)S 227 x
(non-zero)S 216 x(ref.)S 598 y 6888 X(cnt.)S 222 x(?)S 24293 Y 5991 X
(And)S 117 x(so)S 117 x(on,)S 128 x(the)S 117 x(same)S 116 x(as)S
117 x(analyzing)S 118 x(any)S 118 x(process)S 117 x(hang,)S 128 x
(or)S 117 x(resource)S 118 x(allocation)S 598 y 5991 X(problem.)S
222 x(For)S 166 x(more)S 167 x(info)S 166 x(on)S 166 x(SDA,)S 166 x
(see)S 166 x(ST)S -28 x(ARS,)S 166 x(and)S 166 x(BUGCHEC)S -2 x
(K.MEM.)S 29901 Y 12719 X F152(T)S -44 x(roubleshoot)S 2 x(ing)S
167 x(Remote)S 166 x(Print)S 167 x(Queues)S 499 x(5\2039)S
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1000 BP 39600 30600 PM 0 0 XY
4125 Y 4796 X F24(5.8)S 348 x(General)S 231 x(Advice)S 5918 Y 5991 X
F151(Most)S 163 x(RPQ)S 162 x(calls)S 163 x(you)S 164 x(get)S 163 x
(will)S 162 x(be)S 163 x(from)S 163 x(new)S 163 x(users,)S 164 x
(setting)S 163 x(up)S 163 x(RPQs)S 162 x(for)S 163 x(the)S 598 y
5991 X(\211rst)S 197 x(time.)S 314 x(Most)S 197 x(of)S 197 x(their)S
198 x(problems)S 196 x(will)S 197 x(be)S 197 x(mapping)S 197 x(or)S
197 x(hardware;)S 214 x(DEC)S -2 x(-)S 598 y 5991 X(server)S 112 x
(port-)S 111 x(printer)S 112 x(baud)S 112 x(rate/character)S 112 x
(size/parity/)S
(\212ow)S 112 x(control)S 112 x(mismatch)S 598 y 5991 X(or)S 137 x
(cabling.)S 213 x(Use)S 137 x(the)S 137 x("Local>)S 137 x(TEST)S
137 x(PORT")S 136 x(command)S 138 x(to)S 136 x(verify)S 138 x
(printer/port)S 597 y 5991 X(functionality)S -54 x(.)S 222 x(Use)S
165 x("$)S 166 x(COPY/LOG)S 165 x(login.co)S 2 x(m)S 165 x(L)S -27 x
(T)S -27 x(AXX:")S 165 x(to)S 166 x(verify)S 167 x(mapping.)S 10103 Y
5991 X(Be)S 256 x(aware)S 256 x(that)S 256 x(hardware)S 257 x
(problems,)S 279 x(such)S 257 x(as)S 255 x(Ethernet,)S 280 x
(DECserver)S -37 x(,)S 279 x(or)S 597 y 5991 X(System)S 262 x
(errors)S 263 x(can)S 263 x(cause)S 263 x(RPQ)S 262 x(problems.)S
512 x(Look)S 263 x(at)S 262 x(server)S -36 x(,)S 287 x(LCP)S -64 x
(,)S 263 x(NCP)S 598 y 5991 X(counters,)S 167 x("$)S 166 x(Sho)S
166 x(device)S 167 x(XE")S 165 x(to)S 166 x(see)S 166 x(DEUNA/DE)S
-2 x(LUA)S 166 x(errors.)S 13092 Y 5991 X(Use)S 206 x(ST)S -27 x
(ARS)S 205 x(and)S 207 x(the)S 207 x(LA)S -28 x(T)S 207 x(notes)S
206 x(\211le)S 207 x(\(BAGE)S -2 x(LS::LA)S -26 x(T\))S 206 x(to)S
207 x(keep)S 206 x(abreast)S 206 x(of)S 597 y 5991 X(known)S 191 x
(problems)S 190 x(and)S 191 x(\211xes)S 191 x(in)S 191 x(both)S 190 x
(LA)S -27 x(TSYM/L)S -27 x(TDRIVER)S 189 x(and)S 191 x(individual)S
598 y 5991 X(Server)S 167 x(software.)S 16080 Y 5991 X(Read)S 155 x
(the)S 155 x(LA)S -27 x(TSYM/L)S -27 x(TDRIVE)S -2 x(R)S 155 x
(BUG/VERSI)S -2 x(ON)S 155 x(charts)S 155 x(at)S 155 x(the)S 155 x
(end)S 156 x(of)S 155 x(this)S 598 y 5991 X(section;)S 315 x(be)S
265 x(familiar)S 265 x(with)S 264 x(the)S 266 x(possible)S 264 x
(error)S 265 x(messages)S 265 x("INVSTRL)S -47 x(VL",)S 598 y 5991 X
("TOOMNYLIB")S -2 x(,)S 160 x("PSM-F-BADLO)S -2 x(GIC","DE)S -2 x(V)S
-55 x(ALLOC")S 156 x(and)S 157 x(be)S 157 x(able)S 156 x(to)S 157 x
(look)S 598 y 5991 X(up)S 166 x(which)S 167 x(versions)S 166 x(of)S
166 x(LA)S -27 x(TSYM)S 166 x(\211x)S 167 x(which)S 166 x(errors.)S
29901 Y 4796 X F152(5\20310)S 498 x(T)S -45 x(roublesh)S 2 x(ooting)S
167 x(Remote)S 167 x(Print)S 167 x(Queues)S
PP
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%%DOC$Page: 6-1 45
1000 BP 39600 30600 PM 0 0 XY
10574 Y 4796 X F20(Chapte)S -2 x(r)S 897 x(6)S 349 y 4796 X
17928 24 R 11922 Y 4796 X(TSM)S 298 x(-)S 299 x(T)S -67 x(erminal)S
298 x(Server)S 297 x(Manager)S 14015 Y 4796 X F24(6.1)S 348 x
(Overvie)S -2 x(w)S 232 x(of)S 233 x(TSM)S 15808 Y 5991 X F151(TSM)S
200 x(is)S 200 x(a)S 200 x(layered)S 201 x(\(Not)S 199 x(Free\))S
201 x(software)S 199 x(product)S 200 x(which)S 201 x(runs)S 200 x
(under)S 201 x(VMS.)S 598 y 5991 X(It)S 218 x(allows)S 217 x(a)S
218 x(VMS)S 217 x(user)S 218 x(to)S 218 x(control,)S 232 x(test,)S
231 x(and)S 218 x(monitor)S 219 x(any)S 218 x(DECserver)S 218 x(on)S
597 y 5991 X(the)S 170 x(LAN)S 169 x(from)S 170 x(any)S 170 x(Host)S
169 x(VMS)S 170 x(system.)S 232 x(It)S 169 x(functions)S 170 x
(similarly)S 169 x(to)S 170 x(the)S 169 x(NCP)S 598 y 5991 X(Remote)S
166 x(Console)S 165 x(Facility)S 167 x(\(RCF\),)S 166 x(but)S 166 x
(has)S 166 x(many)S 166 x(additional)S 166 x(features.)S 19394 Y
5991 X(One)S 144 x(of)S 143 x(the)S 144 x(primary)S 145 x
(differences)S 143 x(between)S 144 x(TSM)S 144 x(and)S 144 x
(NCP-RCF)S 143 x(is)S 143 x(that)S 144 x(TSM)S 598 y 5991 X(permits)S
117 x(the)S 118 x(usage)S 119 x(of)S 117 x(DCL)S 118 x(Command)S
117 x(\211les,)S 128 x(which)S 118 x(can)S 119 x(be)S 117 x(invok)S
2 x(ed)S 117 x(to)S 118 x(modify)S 598 y 5991 X(V)S -46 x(olatile)S
182 x(or)S 183 x(Permanent)S 183 x(characteristics)S 182 x(on)S 183 x
(a)S 182 x(selected)S 182 x(DECserver)S -37 x(,)S 187 x(a)S 182 x
(group)S 598 y 5991 X(of)S 153 x(DECservers)S 153 x(\(Called)S 152 x
(a)S 154 x(P)S -37 x(ARTITION\),)S 152 x(or)S 154 x(ALL)S 153 x
(DECservers.)S 217 x(A)S 153 x(command)S 597 y 5991 X(\211le)S 156 x
(could)S 156 x(also)S 155 x(be)S 155 x(created)S 156 x(to)S 155 x
(periodically)S 156 x(collect)S 155 x(counter)S 157 x(information)S
155 x(from)S 598 y 5991 X(DECservers,)S 166 x(and)S 166 x(output)S
166 x(can)S 167 x(be)S 166 x(directed)S 166 x(to)S 166 x(a)S 166 x
(log)S
(\211le)S 167 x(for)S 166 x(later)S 166 x(analysis.)S 897 y 5991 X
(Another)S 182 x(signi\211cant)S 183 x(TSM/NCP-RCF)S 182 x
(difference)S 182 x(is)S 182 x(the)S 182 x(ability)S 181 x(to)S 182 x
(use)S 182 x(TSM)S 598 y 5991 X(after)S 195 x(having)S 197 x(done)S
196 x(a)S 195 x("SET)S 195 x(HOST")S 195 x(from)S 195 x(another)S
196 x(node.)S 311 x(TSM)S 195 x(is)S 195 x("stream-)S 597 y 5991 X
(lined",)S 167 x(and)S 166 x(does)S 166 x(not)S 166 x(suffer)S 166 x
(from)S 166 x(NCP-RCF')S -20 x(s)S 166 x(\212ow)S 166 x(control)S
167 x(problems.)S 26269 Y 5991 X(The)S 226 x(TSM)S 226 x(database)S
225 x(superceeds)S 225 x(DSVCONFIG)S -2 x(,)S 226 x(TSVCFG,)S 225 x
(and)S 226 x(DS5CFG.)S 597 y 5991 X(It)S 188 x(provides)S 188 x(the)S
188 x(user)S 189 x(with)S 188 x(a)S 188 x(single)S 188 x(program)S
189 x(to)S 188 x(maintain)S 188 x(all)S 188 x(DECservers)S 598 y
5991 X(in)S 233 x(a)S 232 x(common)S 232 x(database,)S 249 x
(TSM$CONFIG.DA)S -29 x(T)S -45 x(.)S 232 x(V)S -46 x(olatile)S 232 x
(server)S 233 x(attributes)S 598 y 5991 X(are)S 215 x(controlled)S
216 x(via)S 216 x("SET")S 214 x(commands.)S 369 x(Permanent)S 216 x
(Server)S 216 x(attributes)S 215 x(are)S 29901 Y 13818 X F152(TSM)S
166 x(-)S 166 x(T)S -44 x(erminal)S 166 x(Server)S 167 x(Manager)S
499 x(6\2031)S
PP
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(controlled)S 201 x(via)S 200 x("DEFINE")S 199 x
(commands,)S 209 x(and)S 201 x(TSM)S 200 x(takes)S 200 x(care)S 201 x
(of)S 200 x(modifying)S 598 y 5991 X(the)S 166 x(.SYS)S 166 x
(\211les)S 166 x(for)S 166 x(the)S 167 x(DEC)S -2 x(server)S 167 x
(500)S 166 x(and)S 166 x(DECSA\()S -2 x(ETS\).)S 6062 Y 4796 X F24
(6.2)S 348 x(TSM)S 232 x(T)S -51 x(est)S 232 x(commands)S 7855 Y
5991 X F151(TSM)S 166 x(also)S 166 x(allows)S 165 x(has)S 166 x
(extensive)S 167 x(testing)S 166 x(capabilities:)S 896 y 5991 X
(\201)S 595 x(TSM>)S 239 x(TEST)S 239 x(SER)S -19 x(VER)S 238 x
(\(Server_name,)S 259 x(All,)S 257 x(Partition\)-)S 240 x(T)S -46 x
(ests)S 238 x(one)S 240 x(or)S 598 y 6888 X(more)S 153 x(T)S -46 x
(erminal)S 153 x(Servers.)S 218 x(If)S 153 x(the)S 153 x(Server)S
153 x(is)S 153 x(up)S 153 x(&)S 153 x(running)S 155 x(and)S 153 x
(responds,)S 598 y 6888 X(the)S 260 x(TSM)S 261 x(prompt)S 259 x(is)S
260 x(returned.)S 506 x(If)S 259 x(the)S 261 x(Server)S 261 x(fails)S
259 x(to)S 261 x(respond,)S 284 x(an)S 598 y 6888 X(informational)S
166 x(error)S 167 x(message)S 165 x(is)S 166 x(displayed.)S 896 y
5991 X(\201)S 595 x(TSM>)S 151 x(TEST)S 151 x(CIRCUIT)S 150 x(SER)S
-19 x(VER)S 150 x(\(Server_Name,)S 155 x(All,)S 154 x(Partition\))S
152 x(T)S -46 x(ests)S 598 y 6888 X(driver)S -36 x(,)S 261 x
(Ethernet)S 243 x(controller)S -37 x(,)S 262 x(and)S 243 x
(connection)S 243 x(over)S 243 x(the)S 242 x(circuit)S 243 x(to)S
242 x(the)S 598 y 6888 X(speci\211ed)S 166 x(DECs)S -2 x(erver)S
-36 x(.)S 896 y 5991 X(\201)S 595 x(TSM>)S 228 x(TEST)S 228 x(DELA)S
-47 x(Y)S 228 x(SER)S -20 x(VER)S 227 x(\(Server_Name,)S 245 x(All,)S
243 x(Partition\)-)S 228 x(Dis-)S 598 y 6888 X(plays)S 212 x(the)S
213 x(averag)S 2 x(e,)S 225 x(minimum,)S 225 x(and)S 213 x(maximum)S
213 x(round-trip)S 213 x(packet)S 213 x(de-)S 598 y 6888 X(lays)S
313 x(between)S 312 x(the)S 314 x(V)S -56 x(AX)S 312 x(and)S 313 x
(the)S 313 x(speci\211ed)S 313 x(DECserver)S -37 x(.)S 663 x(This)S
313 x(can)S 598 y 6888 X(be)S 319 x(very)S 320 x(helpful)S 319 x(in)S
319 x(diagnosing)S 321 x(suspected)S 318 x(delay)S 319 x(problems)S
319 x(in)S 319 x(Ex-)S 598 y 6888 X(tended)S 193 x(LAN)S 193 x
(environmen)S 2 x(ts,)S 200 x(where)S 193 x(Synchron)S 2 x(ous)S
193 x(Line)S 194 x(Bridges)S 193 x(\(Such)S 597 y 6888 X(as)S 165 x
(T)S -30 x(ranslan/V)S -22 x(italink\))S 166 x(are)S 167 x(used.)S
897 y 5991 X(\201)S 595 x(TSM>)S 203 x(TEST)S 203 x(CONNECTIO)S -2 x
(N)S 203 x(PORT)S 203 x(L)S -27 x(T)S -27 x(AXX)S 202 x([count)S
204 x(n)S 204 x(width)S 203 x(n])S 203 x(This)S 598 y 6888 X(is)S
163 x(useful)S 165 x(in)S 164 x(Diagnosing)S 165 x(LA)S -27 x(T)S
164 x(printer)S 165 x(problems.)S 221 x(A)S 164 x(successful)S 164 x
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6888 X(fails,)S 159 x(the)S 158 x(failure)S 159 x(reason)S 158 x
(from)S 158 x(the)S 158 x(device)S 159 x(IOSB)S 157 x(is)S 157 x
(displayed)S 158 x(\(T)S -12 x(imeout,)S 598 y 6888 X(Hangup,)S 167 x
(Rejected,)S 167 x(etc.\))S 897 y 5991 X(\201)S 595 x(TSM>)S 295 x
(TEST)S 296 x(LA)S -28 x(T)S 296 x(\(Server_Name,)S 329 x(All,)S
327 x(Partition\))S 296 x(This)S 296 x(is)S 295 x(a)S 295 x(more)S
597 y 6888 X(complete)S 137 x(test)S 137 x(of)S 137 x(the)S 138 x
(LA)S -27 x(T/SER)S -19 x(VER)S 136 x(interface)S 138 x(than)S 138 x
(the)S 138 x(TEST)S 138 x(SER)S -20 x(VER)S 598 y 6888 X(command,)S
237 x(which)S 222 x(only)S 223 x(interacts)S 222 x(with)S 222 x
(microcode)S 223 x(on)S 223 x(the)S 222 x(DECserver)S -37 x(.)S 598 y
6888 X(The)S 133 x(TEST)S 132 x(LA)S -28 x(T)S 133 x(command)S 132 x
(also)S 132 x(veri\211es)S 133 x(the)S 133 x(DECs)S -2 x(erver)S
29 x(')S -19 x(s)S 132 x(name)S 132 x(against)S 598 y 6888 X(the)S
178 x(TSM)S 178 x(database,)S 181 x(and)S 179 x(reports)S 178 x(any)S
179 x(mismatch.)S 257 x(VMS)S 178 x(V5)S 178 x(is)S 178 x(required)S
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-28 x(T)S 167 x(command.)S 29901 Y 4796 X F152(6\2032)S 498 x(TSM)S
166 x(-)S 166 x(T)S -44 x(erminal)S 166 x(Server)S 167 x(Manager)S
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4125 Y 4796 X F24(6.3)S 348 x(Common)S 232 x(TSM)S 232 x
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(common)S 145 x(problems)S 144 x(with)S 145 x(TSM)S 145 x(are)S 145 x
(seen)S 145 x(at)S 144 x(installation)S 145 x(time,)S 149 x(and)S
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166 x(failure)S 167 x(to)S 165 x(READ)S 165 x(THE)S 166 x(RELEASE)S
164 x(NOTES!)S 8309 Y 5991 X(If,)S 369 x(after)S 329 x(upgrading)S
330 x(from)S 328 x(TSM)S 329 x(1.1)S 329 x(to)S 328 x(1.2,)S 371 x
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(parsing)S 356 x('OUTPUT'")S 354 x(is)S 355 x(displayed,)S 403 x
(this)S 355 x(indicates)S 355 x(that)S 355 x(the)S 355 x(customer)S
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(in)S 226 x(LOGIN.COM)S 225 x(or)S 227 x(SYLOGI)S -2 x(N.COM-)S 227 x
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240 x(This)S 240 x(Foreign)S 242 x(command)S 240 x(de\211nition)S
241 x(MUST)S 597 y 5991 X(BE)S 180 x(REMOVED)S 179 x(for)S 181 x
(TSM)S 181 x(1.2,)S 186 x(since)S 181 x(TSM)S 181 x(is)S 181 x(now)S
181 x(invoked)S 182 x(by)S 181 x(a)S 181 x(DCL)S 180 x(com-)S 598 y
5991 X(mand.)S 475 x(First,)S 271 x(remove)S 251 x(the)S 251 x
(symbol)S 250 x(de\211nition)S 251 x(in)S 251 x(the)S 250 x(.COM)S
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196 x(symbol)S 195 x(\(See)S 194 x(TSM)S 196 x(1.2)S 598 y 5991 X
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(Attempting)S 132 x(to)S 132 x(set)S 132 x(Server)S 134 x
(attributes)S 132 x(which)S 132 x(modify)S 133 x(the)S 133 x(DECNE)S
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170 x(NML)S 171 x(access)S 171 x(or)S 171 x(the)S 170 x(Proxy)S 172 x
(account)S 597 y 5991 X(for)S 166 x(the)S 166 x(user)S 167 x
(running)S 168 x(TSM)S 166 x(\(See)S 166 x(TSM)S 166 x(1.2)S 167 x
(release)S 166 x(notes)S 166 x(sec.)S 221 x(1.2.\))S 897 y 5991 X(T)S
-31 x(ry)S 144 x($)S 143 x(DEFINE)S 142 x(TSM$NO_PROXY)S 142 x
(TRUE,)S 143 x(and)S 144 x(then)S 143 x(re-runn)S 2 x(ing)S 144 x
(TSM.)S 143 x(Y)S -55 x(ou)S 598 y 5991 X(will)S 246 x(be)S 247 x
(asked)S 246 x(to)S 247 x(enter)S 247 x(a)S 247 x(Username)S 247 x
(and)S 247 x(Password)S 245 x(when)S 248 x(you)S 247 x(attempt)S
597 y 5991 X(any)S 146 x(operations)S 145 x(which)S 146 x(access)S
145 x(the)S 145 x(DECNET)S 144 x(database.)S 215 x(The)S 146 x
(Username)S 145 x(and)S 598 y 5991 X(Password)S 178 x(MUST)S 179 x
(be)S 178 x(EIGHT)S 178 x(CHARAC)S -2 x(TERS)S 178 x(OR)S 178 x
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5991 X(cannot)S 212 x(provide)S 211 x(these,)S 222 x(then)S 212 x
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(problems)S 170 x(\(Default)S 171 x(DECNE)S -2 x(T)S 172 x(account,)S
174 x(NCP>)S 598 y 5991 X(TELL)S 202 x(0""::)S 292 x(SHO)S 200 x
(EXEC)S 200 x(CHAR,)S 200 x(etc\).)S 328 x(If)S 200 x(TSM)S 202 x
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213 x(P)S -37 x(ASSWOR)S -2 x(D,)S 213 x(and)S 212 x(the)S 213 x
(DECNET)S 211 x(database)S 212 x(is)S 212 x(successfully)S 213 x
(modi\211ed,)S 597 y 5991 X(then)S 169 x(the)S 169 x(Proxy)S 170 x
(account)S 170 x(for)S 168 x(this)S 169 x(user)S 168 x(is)S 169 x
(NOT)S 168 x(set)S 168 x(up)S 169 x(properly)S -55 x(.)S 230 x(See)S
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5991 X(account)S 167 x(up.)S 27438 Y 5991 X(Don')S -9 x(t)S 127 x
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10574 Y 4796 X F20(Chapte)S -2 x(r)S 897 x(7)S 349 y 4796 X
17928 24 R 11922 Y 4796 X(QIO')S -34 x(s)S 298 x(to)S 299 x(L)S -67 x
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(the)S 166 x(usage)S 167 x(of)S 166 x(^Y)S 165 x(AST')S -19 x(s)S
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5991 X(Both)S 229 x(ST)S -27 x(ARS)S 228 x(and)S 229 x(DSIN)S 228 x
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(grams.)S 226 x(The)S 168 x(MACRO)S 166 x(program)S 168 x("CONNEC)S
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(DYNR)S -2 x(A)S -27 x(T)S 180 x(program,)S 185 x(which)S 181 x
(brings)S 180 x(us)S 598 y 5991 X(to:)S 29901 Y 4796 X F152(7\2032)S
498 x(QIO)S -2 x(')S -18 x(s)S 166 x(to)S 166 x(L)S -27 x(T)S -9 x
(A)S 166 x(ports)S
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1000 BP 39600 30600 PM 0 0 XY
4050 Y 4796 X F28(7.1.2)S 300 x(VMS)S 198 x(V)S -33 x(ersion)S 200 x
(5)S 200 x(New)S 199 x(Problems)S 5843 Y 5991 X F151(The)S 206 x
(most)S 204 x(visible)S 205 x(problem)S 204 x(introduced)S 206 x
(with)S 204 x(VMS)S 205 x(V5)S 204 x(LA)S -27 x(T)S 205 x(is)S 204 x
(the)S 206 x(Service)S 598 y 5991 X(Rating)S 155 x(Algorythm.)S 219 x
(Under)S 155 x(V4.X,)S 155 x(the)S 155 x(number)S 156 x(of)S 154 x
(processors)S 155 x(in)S 155 x(a)S 154 x(CPU)S 155 x(was)S 598 y
5991 X(not)S 194 x(taken)S 195 x(into)S 195 x(account,)S 202 x(and)S
195 x(LA)S -28 x(T)S 195 x(service)S 194 x(ratings)S 195 x
(typically)S 195 x(ranged)S 195 x(\(with)S 598 y 5991 X(no)S 167 x
(users\))S 165 x(from)S 166 x(80)S 166 x(to)S 166 x(255.)S 9430 Y
5991 X(Under)S 227 x(VMS)S 225 x(V5,)S 242 x(the)S 226 x(algorythm)S
227 x(was)S 226 x(changed)S 227 x(to)S 226 x(allow)S 226 x(for)S
226 x(a)S 226 x(maximum)S 598 y 5991 X(of)S 235 x(8)S 235 x
(processors)S 234 x(per)S 235 x(CPU)S 235 x(\(presumably)S 235 x(a)S
235 x(Mega-Calypso\).)S 428 x(The)S 236 x(effect)S 234 x(of)S 597 y
5991 X(this)S 231 x(change)S 232 x(is)S 231 x(that)S 231 x(a)S 231 x
(single-processor)S 232 x(CPU)S 231 x(such)S 231 x(as)S 231 x(the)S
231 x(780,)S 248 x(8200,)S 248 x(or)S 598 y 5991 X(6210)S 179 x
(could)S 180 x(have)S 180 x(a)S 179 x(maximum)S 180 x(rating)S 180 x
(of)S 179 x(around)S 180 x(30,)S 183 x(more)S 179 x(typically)S 180 x
(15-25,)S 598 y 5991 X(depending)S 176 x(on)S 174 x(CPU)S 175 x
(type,)S 177 x(memory)S -55 x(,)S 177 x(etc.)S 248 x(The)S 175 x
(problem)S 174 x(with)S 174 x(this)S 175 x(is)S 174 x(that)S 174 x
(an)S 598 y 5991 X("invisible")S 156 x(bias)S 156 x(of)S 156 x(15)S
156 x(is)S 156 x(added)S 156 x(to)S 156 x(any)S 157 x(V)S -55 x(AX)S
155 x(to)S 156 x(which)S 157 x(a)S 156 x(DECserver)S 156 x(already)S
597 y 5991 X(has)S 166 x(a)S 166 x(V)S -22 x(irtual)S 166 x(Circuit)S
166 x(established.)S 14810 Y 5991 X(The)S 122 x(end)S 122 x(result)S
121 x(is)S 121 x(as)S 120 x(follows:)S 199 x(If)S 121 x(the)S 121 x
(\211rst)S 121 x(user)S 122 x(on)S 122 x(a)S 121 x(DECs)S -2 x
(erver)S 123 x(500)S 121 x(connects)S 598 y 5991 X(to)S 142 x
(service)S 142 x("CLUSTER",)S 146 x(offered)S 142 x(by)S 143 x
(nodes)S 142 x(V)S -56 x(AXA)S 141 x(and)S 143 x(V)S -56 x(AXB,)S
141 x(which)S 143 x(happen)S 597 y 5991 X(to)S 187 x(have)S 188 x
(current)S 188 x(ratings)S 187 x(of)S 187 x(12)S 187 x(and)S 187 x
(14,)S 193 x(respectively)S -55 x(,)S 193 x(he)S 187 x(will)S 186 x
(be)S 187 x(connec)S 2 x(ted)S 598 y 5991 X(to)S 197 x(V)S -56 x
(AXB,)S 196 x(since)S 197 x(V)S -55 x(AXB)S 196 x(has)S 196 x(the)S
197 x(high)S 2 x(er)S 197 x(rating.)S 315 x(Any)S 197 x(subsequent)S
197 x(users)S 197 x(on)S 598 y 5991 X(this)S 192 x(DECs)S -2 x
(erver)S 194 x(500)S 192 x(who)S 192 x(connect)S 193 x(to)S 192 x
("CLUSTER")S 191 x(will)S 191 x(also)S 192 x(be)S 192 x(connected)S
598 y 5991 X(to)S 190 x(V)S -55 x(AXB,)S 189 x(since)S 191 x(V)S
-56 x(AXB')S -20 x(s)S 190 x("invisible")S 190 x(rating)S 191 x(is)S
190 x(now)S 190 x(29,)S 197 x(due)S 191 x(to)S 190 x(the)S 191 x
(existing)S 597 y 5991 X(VC)S 165 x(bias.)S 20190 Y 5991 X(W)S -28 x
(orst)S 175 x(case)S 174 x(-)S 174 x(Even)S 176 x(if)S 174 x(V)S
-56 x(AXB')S -19 x(s)S 174 x(rating)S 175 x(drops)S 174 x(to)S 175 x
(0,)S 177 x(the)S 175 x(DEC500)S 173 x(still)S 174 x(applies)S 597 y
5991 X(an)S 130 x(internal)S 130 x(bias)S 128 x(of)S 130 x(15,)S
137 x(and)S 129 x(all)S 129 x(128)S 130 x(users)S 129 x(on)S 130 x
(the)S 129 x(DEC500)S 128 x(will)S 129 x(be)S 129 x(connec)S 2 x
(ted)S 598 y 5991 X(to)S 178 x(V)S -55 x(AXB)S 177 x(\(which)S 179 x
(by)S 178 x(now)S 179 x(is)S 178 x("on)S 178 x(its)S 178 x(knees"\))S
178 x(until)S 179 x(V)S -56 x(AXA)S -37 x(')S -19 x(s)S 178 x
(rating)S 179 x(comes)S 178 x(up)S 598 y 5991 X(above)S 167 x(15.)S
23776 Y 5991 X(The)S 202 x(DYNR)S -2 x(A)S -27 x(T050)S 201 x
(program)S 201 x(uses)S 201 x(the)S 201 x(IO$M_L)S -28 x(T_RA)S -27 x
(TING)S 200 x(modi\211er)S 201 x(to)S 201 x(set)S 598 y 5991 X(the)S
198 x(service)S 198 x(rating)S 199 x(once)S 199 x(a)S 197 x(minute,)S
207 x(and)S 198 x(is)S 197 x(customer)S -8 x(-tailorable)S 197 x(to)S
198 x(provide)S 598 y 5991 X(ratings)S 222 x(in)S 222 x(a)S 222 x
(higher)S 223 x(\(80-200\))S 221 x(range)S 2 x(,)S 236 x(where)S
222 x(a)S 222 x(15)S 221 x(point)S 222 x(bias)S 222 x(will)S 221 x
(have)S 222 x(a)S 597 y 5991 X(much)S 206 x(lesser)S 204 x(pronoun)S
2 x(ced)S 205 x(affect.)S 339 x(DYNR)S -2 x(A)S -27 x(T050)S 205 x
(is)S 204 x(available)S 206 x(to)S 205 x(customers)S 598 y 5991 X
(through)S 168 x(CSC/CS.)S 29901 Y 17082 X F152(QIO')S -20 x(s)S
166 x(to)S 167 x(L)S -28 x(T)S -8 x(A)S 165 x(ports)S 499 x(7\2033)S
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1000 BP 39600 30600 PM 0 0 XY
10574 Y 4796 X F20(Chapte)S -2 x(r)S 897 x(8)S 349 y 4796 X
17928 24 R 11922 Y 4796 X(LA)S -67 x(T)S 299 x(Cheat)S 298 x(Sheet)S
-2 x(s)S 14015 Y 4796 X F24(8.1)S 348 x(Down-line)S 231 x(Loading)S
233 x(Cheat)S 232 x(Sheet)S 15808 Y 5991 X F151(Do)S 166 x(we)S 165 x
(see)S 166 x(load)S 166 x(requests)S 166 x(from)S 166 x(the)S 166 x
(server)S -36 x(,)S 166 x(via)S 167 x(OPCOM?)S 897 y 5991 X(\201)S
595 x(NCP>)S 165 x(SHO)S 166 x(EVENT)S 165 x(LOG)S 165 x(MONITOR)S
165 x(!)S 167 x(Events)S 166 x(0.0-9)S 166 x(enabled?)S 896 y 5991 X
(\201)S 595 x(NCP>)S 165 x(SET)S 166 x(LOG)S 166 x(MON)S 165 x
(KNOWN)S 165 x(EVENTS)S 897 y 5991 X(\201)S 595 x(NCP>)S 165 x(SET)S
166 x(LOG)S 166 x(MON)S 165 x(ST)S -27 x(A)S -28 x(TE)S 166 x(ON)S
896 y 5991 X(\201)S 595 x(NCP>)S 165 x(SET)S 166 x(LOG)S 166 x(MON)S
165 x(EVENT)S 166 x(0.0-9)S 897 y 5991 X(\201)S 595 x($)S 166 x
(REPL)S -46 x(Y/ENABLE=NE)S -2 x(T)S 166 x(!)S 167 x(Now)S 166 x
(try)S 166 x(cycling)S 168 x(server)S 166 x(again-)S 167 x(see)S
166 x(load?)S 22084 Y 5991 X(If)S 126 x(we)S 125 x(still)S 126 x
(see)S 125 x(no)S 127 x(load)S 126 x(request,)S 134 x(do)S 126 x
(other)S 127 x(vaxes)S 126 x(on)S 127 x(ethernet?)S 209 x(Hook)S
126 x(terminal)S 598 y 5991 X(up)S 156 x(to)S 156 x(console)S 156 x
(port)S 156 x(on)S 157 x(server)S -37 x(.)S 219 x(Self-test)S 155 x
(messages?)S 217 x(Ethernet)S 156 x(loop)S 156 x(failures?)S 897 y
5991 X(\201)S 595 x(DECN)S -2 x(ET)S 166 x(is)S 166 x(up)S 166 x(&)S
166 x(runn)S 2 x(ing)S 166 x(on)S 167 x(ETHERNET)S 165 x(device?)S
896 y 5991 X(\201)S 595 x(NCP>)S 165 x(SHO)S 166 x(CIRC)S 165 x
(UNA-0)S 165 x(ST)S -27 x(A)S -28 x(T)S 897 y 5991 X(\201)S 595 x
(SER)S -20 x(VICE)S 165 x(enabled)S 166 x(on)S 167 x(circuit?)S 897 y
5991 X(\201)S 595 x(NCP>)S 165 x(SHO)S 166 x(CIRC)S 165 x(UNA-0)S
165 x(CHAR)S 896 y 5991 X(\201)S 595 x(MOM$LOAD)S 165 x(de\211ned?)S
897 y 5991 X(\201)S 595 x($)S 110 x(SHO)S 110 x(LOG)S 110 x
(MOM$LOAD)S 110 x(!MOM$LOAD)S 110 x(=)S 111 x(SYS$C)S -2 x
(OMMON:[DECSER)S -20 x(VER]?)S 29901 Y 17286 X F152(LA)S -37 x(T)S
166 x(Cheat)S 167 x(Sheets)S 499 x(8\2031)S
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1000 BP 39600 30600 PM 0 0 XY
4000 Y 5991 X F151(\201)S 595 x($)S 117 x(DEFINE/SYS/EX)S -2 x(EC)S
117 x(MOM$LOAD)S 116 x(SYS$COMMON:[D)S -2 x(ECSER)S -20 x(VER])S
897 y 5991 X(\201)S 595 x(Correct)S 166 x(\211le)S 166 x(in)S 166 x
(MOM$LOAD?)S 897 y 5991 X(\201)S 595 x($)S 166 x(DIR)S 165 x
(MOM$LOAD:*.SYS)S 7587 Y 5991 X(Check)S 167 x(for)S 166 x(DEF)S -38 x
(AUL)S -27 x(T)S 166 x(DECNET)S 165 x(access)S 897 y 5991 X(\201)S
595 x($)S 166 x(DIR)S 165 x(0""::)S 222 x(-)S 165 x(Should)S 167 x
(return)S 167 x(directory)S 167 x(of)S 166 x(DECN)S -2 x(ET)S 166 x
(directory)S 10277 Y 5991 X(If)S 166 x(DEF)S -38 x(AUL)S -27 x(T)S
166 x(DECNET)S 165 x(account)S 167 x(is)S 165 x(not)S 167 x(set)S
165 x(up-)S 897 y 5991 X(\201)S 595 x($)S 166 x(SET)S 165 x(DEF)S
166 x(SYS$SYSTE)S -2 x(M)S 896 y 5991 X(\201)S 595 x($)S 166 x(R)S
165 x(AUTHORIZE)S 897 y 5991 X(\201)S 595 x(UAF>)S 165 x(SHO)S 166 x
(DECNE)S -2 x(T)S 167 x(!)S 166 x(make)S 166 x(sure)S 167 x(Disuser)S
165 x(\212ag)S 167 x(is)S 165 x(not)S 167 x(set)S 897 y 5991 X(\201)S
595 x(UAF>)S 165 x(MOD)S 166 x(DECNE)S -2 x(T/P)S -36 x(ASS=DEC)S
-2 x(NET)S 896 y 5991 X(\201)S 595 x($)S 166 x(SET)S 165 x
(PROC/PRIV=ALL)S 897 y 5991 X(\201)S 595 x(NCP>)S 254 x(SHO)S 254 x
(EXEC)S 253 x(CHAR)S 253 x(!)S 255 x(look)S 255 x(for)S 255 x
(nonpriv)S 255 x(user)S 255 x(id,)S 277 x(password)S 253 x(=)S 598 y
6888 X(DECN)S -2 x(ET)S 896 y 5991 X(\201)S 595 x(NCP>)S 240 x(SET)S
240 x(EXEC)S 239 x(NONPRIV)S 239 x(USER)S 240 x(DEC)S -2 x(NET)S
241 x(NONPRIV)S 239 x(P)S -37 x(ASSW)S 598 y 6888 X(DECN)S -2 x(ET)S
19542 Y 5991 X(T)S -31 x(ry)S 167 x(forcing)S 167 x(use)S 166 x(of)S
166 x(default)S 166 x(DECNET)S 165 x(account)S 167 x(again)S 897 y
5991 X($)S 166 x(DIR)S 165 x(0""::)S 22232 Y 5991 X(If)S 166 x
(still)S 165 x(problems:)S 897 y 5991 X(\201)S 595 x(Check)S 187 x
(SYS$MANA)S -2 x(GER:SYLOGI)S -2 x(N.COM-)S 186 x(Does)S 186 x(it)S
186 x(check)S 187 x(for)S 187 x(network)S 598 y 6888 X(access,)S
166 x(and)S 166 x(EXIT?)S 896 y 5991 X(\201)S 595 x(IF)S 166 x
(F$MODE\()S 82 x(\))S 166 x(.EQS.)S 166 x("NETWOR)S -2 x(K")S 166 x
(THEN)S 166 x(EXIT)S 897 y 5991 X(\201)S 595 x(Check)S 166 x
(protection)S 167 x(on)S 166 x(SYLOGIN.CO)S -2 x(M-)S 167 x(W)S -19 x
(:RE)S 166 x(?)S 896 y 5991 X(\201)S 595 x($)S 110 x(DIR/PROT)S 110 x
(SYS$MANAG)S -2 x(ER:SYLOGIN.CO)S -2 x(M)S 111 x(!)S 112 x(\(R)S
-19 x(WED)S -2 x(,R)S -18 x(WED,R)S -19 x(WED,RE)S -2 x(\))S 897 y
5991 X(\201)S 595 x(Check)S 166 x(protection)S 167 x(on)S 166 x
(SYS$SYSTEM:NETSER)S -20 x(VER.*)S 897 y 5991 X(\201)S 595 x($)S
110 x(DIR/PROT)S 110 x(SYS$SYSTEM:NETSER)S -20 x(VER.EXE)S -2 x(,)S
112 x(.COM)S 110 x(!)S 111 x(\(R)S -19 x(WED,R)S -19 x(WED,RE,RE)S
-2 x(\))S 29901 Y 4796 X F152(8\2032)S 498 x(LA)S -37 x(T)S 166 x
(Cheat)S 166 x(Sheet)S 2 x(s)S
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1000 BP 39600 30600 PM 0 0 XY
4000 Y 5991 X F151(\201)S 595 x(Check)S 166 x(protection)S 167 x(on)S
166 x(SYS$SYSTEM:MOM.*)S 897 y 5991 X(\201)S 595 x($)S 110 x
(DIR/PROT)S 110 x(SYS$SYSTEM:MOM.EXE,)S 110 x(MOM.COM)S 111 x(!)S
111 x(\(R)S -19 x(WED,R)S -20 x(WED,RE,RE\))S 6392 Y 4796 X F24(8.2)S
348 x(RPQ)S 269 x(Cheat)S 270 x(Sheet:)S 386 x(Rainy)S 269 x(Day)S
269 x(Activities)S 269 x(with)S 797 y 6114 X(RPQ')S -27 x(s.)S 8384 Y
5991 X F151(\201)S 595 x(Single)S 166 x(RPQ)S 166 x(has)S 166 x
(problem?)S 221 x(Multiple)S 166 x(RPQ')S -19 x(s)S 166 x(have)S
167 x(problem?)S 897 y 5991 X(\201)S 595 x(Queue)S 166 x(pointing)S
167 x(to)S 166 x(same)S 165 x(printer)S 167 x(from)S 166 x(other)S
166 x(system)S 166 x(working?)S 896 y 5991 X(\201)S 595 x(New)S 165 x
(install?)S 897 y 5991 X(\201)S 595 x(Existing)S 166 x(queue,)S 167 x
(stopped)S 166 x(working?)S 897 y 5991 X(\201)S 595 x(OPCOM)S 206 x
(error)S 207 x(messages?)S 344 x(Check)S 208 x(for)S 207 x(known)S
207 x(errors/rev)S 2 x(ision)S 207 x(of)S 207 x(LA)S -28 x(T-)S 597 y
6888 X(SYM)S 897 y 5991 X(\201)S 595 x($)S 205 x(SHO)S 206 x(QUEUE)S
-2 x(/FULL)S 2 x(/ALL)S 206 x("queue_name")S 207 x(!)S 341 x
(/PROCESS=LA)S -29 x(TSYM?)S 598 y 6888 X(/RET)S -28 x(AIN=ERRO)S
-2 x(R?)S 166 x(Any)S 166 x(error)S 167 x(status?)S 896 y 5991 X
(\201)S 595 x($)S 166 x(STOP/QUEUE/RES)S -2 x(ET)S 166 x
("queue_name")S 897 y 5991 X(\201)S 595 x($)S 166 x(SET)S 165 x
(DEV/NOSPOO)S -2 x(L)S 167 x(L)S -27 x(T)S -28 x(AXX:)S 897 y 5991 X
(\201)S 595 x($)S 256 x(COPY/LOG)S 256 x("text\211le")S 256 x(L)S
-27 x(T)S -27 x(AXX:)S 256 x(!)S 493 x(Dataset)S 256 x(Hangup?)S
494 x(MAPPING.!)S 597 y 6888 X(Success?)S 221 x(T)S -31 x(ry)S 167 x
(6-7)S 166 x(more)S 166 x(times.)S 221 x(V)S -46 x(erify)S 167 x
(output.)S 19144 Y 5991 X(If)S 189 x("copy")S 189 x(sometimes)S 188 x
(works,)S 195 x(sometimes)S 188 x(fails)S 189 x(w/dataset)S 188 x
(hangu)S 2 x(p,)S 195 x(consider)S 597 y 5991 X("Evil)S 225 x(T)S
-35 x(win")S 225 x(\(2)S 225 x(servers)S 225 x(w/same)S 225 x(name-)S
225 x(see)S 225 x("T/shooting)S 227 x(RPQ')S -20 x(s")S 225 x(for)S
225 x(more)S 598 y 5991 X(info\).)S 897 y 5991 X(\201)S 595 x($)S
166 x(SHO)S 165 x(SYS)S 165 x(!)S 167 x(Symbiont)S 166 x(R)S -19 x
(W)S -46 x(AST'ed)S 166 x(or)S 166 x(COM?)S 897 y 5991 X(\201)S 595 x
($)S 166 x(SHO)S 165 x(QUEUE/DEV)S -2 x(ICE)S 165 x(!)S 167 x(Only)S
166 x(1)S 166 x(queue)S 167 x(per)S 166 x(L)S -27 x(T)S -27 x(A)S
166 x(device!!!)S 896 y 5991 X(\201)S 595 x(Create)S 165 x(new)S
166 x(L)S -27 x(T)S -27 x(A)S 166 x(port)S 166 x(pointing)S 167 x
(to)S 166 x(same)S 165 x(Server)S -36 x(,)S 167 x(port.)S 897 y
5991 X(\201)S 595 x(Create)S 165 x(new)S 166 x("plain)S 166 x
(vanilla")S 167 x(RPQ)S 165 x(pointing)S 167 x(to)S 166 x(new)S 166 x
(device.)S 896 y 5991 X(\201)S 595 x(Make)S 138 x(2nd)S 138 x(copy)S
138 x(of)S 138 x(LA)S -27 x(TSYM,)S 138 x(use)S 137 x(it)S 138 x
(\(force)S 138 x(creation)S 138 x(of)S 138 x(new)S 137 x(SYMBIONT)S
598 y 6888 X(process\).)S 27213 Y 5991 X(Corrupted)S 166 x
(SYS$SYSTEM:JBCSY)S -2 x(SQUE.DA)S -29 x(T?)S 897 y 5991 X(\201)S
595 x(Stop)S 110 x(queue)S 111 x(manager)S -36 x(,)S 123 x(rename)S
111 x(existing)S 111 x(.DA)S -28 x(T\211le,)S 123 x($)S 111 x(ST)S
-27 x(ART/QUEUE/MAN/NEW)S 29901 Y 17286 X F152(LA)S -37 x(T)S 166 x
(Cheat)S 167 x(Sheets)S 499 x(8\2033)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(\201)S 595 x(Remember)S -38 x(,)S 167 x(this)S
166 x(affects)S 165 x(ALL)S 166 x(Queues,)S 167 x(print)S 166 x(&)S
166 x(batch!)S 897 y 5991 X(\201)S 595 x($)S 255 x(ANAL/IMAGE)S 254 x
(SYS$SYSTEM:LA)S -28 x(TSYM)S 255 x(\(or)S 256 x(L)S -27 x(TDRIVE)S
-2 x(R\))S 255 x(!)S 256 x(V)S -46 x(erify)S 598 y 6888 X
(revisions.)S 896 y 5991 X(\201)S 595 x($)S 196 x(ANAL/IMAGE)S 194 x
(SYS$LOADA)S -2 x(BLE_IMAGES:L)S -28 x(TDRIVE)S -2 x(R)S 196 x(!)S
196 x(for)S 197 x(VMS)S 598 y 6888 X(5.0)S 897 y 5991 X(\201)S 595 x
(LCP>)S 166 x(SHO)S 165 x(PORT)S 166 x(L)S -27 x(T)S -27 x(AXX)S
165 x(!)S 166 x(Find)S 167 x(Remote)S 165 x(server)S -36 x(,)S 166 x
(port)S 166 x(names.)S 896 y 5991 X(\201)S 595 x(LCP>)S 166 x(SHO)S
165 x(COUNT)S 166 x(!)S 166 x(Look)S 167 x(for)S 166 x(Xmit)S 165 x
(failures,)S 167 x(protocol)S 166 x(errors.)S 897 y 5991 X(\201)S
595 x(LCP>)S 166 x(SHO)S 165 x(COUNT/SER)S -19 x(VER)S 165 x(!)S
166 x(Any)S 167 x(1)S 166 x(server)S 166 x(w/extreme)S 167 x
(errors?)S 897 y 5991 X(\201)S 595 x(Local>)S 203 x(SHO)S 201 x
(PORT)S 203 x(8)S 202 x(!)S 332 x(V)S -46 x(erify)S 203 x(access)S
202 x(remote)S 202 x(or)S 203 x(dynamic,)S 213 x(\212ow)S 203 x
(ctl,)S 212 x(!)S 597 y 6888 X(autobaud)S 166 x(dis,)S 166 x(char)S
167 x(size,)S 166 x(etc.)S 221 x(DSRLOGO)S -2 x(UT)S 167 x(and)S
166 x(MODEM)S 165 x(disabled?)S 897 y 5991 X(\201)S 595 x(Local>)S
166 x(SHO)S 165 x(PORT)S 166 x(8)S 166 x(ST)S -27 x(A)S -28 x(T)S
166 x(!)S 167 x(Disconnecting?)S 222 x(Idle?)S 897 y 5991 X(\201)S
595 x(Local>)S 206 x(TEST)S 206 x(PORT)S 206 x(8)S 206 x(COUNT)S
205 x(200)S 206 x(!)S 342 x(V)S -46 x(erify)S 206 x(cabling,)S 218 x
(printer)S -37 x(,)S 217 x(baud,)S 597 y 6888 X(etc.)S 897 y 5991 X
(\201)S 595 x(Replace)S 188 x(printer)S 190 x(with)S 189 x(VT)S 188 x
(terminal,)S 196 x(repeat)S 189 x(TEST)S 189 x(PORT)S -46 x(,)S 189 x
(COPY)S 188 x(com-)S 598 y 6888 X(mands.)S 897 y 5991 X(\201)S 595 x
(Local>)S 166 x(SHO)S 165 x(COUNT)S 166 x(!)S 166 x(Look)S 167 x
(for)S 166 x(Solicitations)S 166 x(accepted)S 166 x(increment.)S
896 y 5991 X(\201)S 595 x(Local>)S 120 x(SHO)S 119 x(PORT)S 120 x(8)S
120 x(COUNT)S 119 x(!)S 120 x(Remote)S 120 x(access)S 119 x(+?)S
206 x(Framing)S 121 x(errs?)S 206 x(Flow)S 598 y 6888 X(ctl!)S 897 y
5991 X(\201)S 595 x(NCP>)S 209 x(SHO)S 209 x(COUNT)S 209 x(LINE)S
209 x(UNA-0)S 210 x(!)S 352 x(Send,)S 222 x(receive,)S 222 x
(collision)S 209 x(detect)S 597 y 6888 X(failures?)S 897 y 5991 X
(\201)S 595 x(NCP>)S 165 x(ZERO)S 166 x(LINE)S 165 x(UNA-0)S 166 x
(COUNT)S 165 x(!)S 167 x(Clear)S 166 x(counters)S 897 y 5991 X(\201)S
595 x(NCP>)S 240 x(LOOP)S 239 x(NODE)S 239 x("V)S -56 x(AX_NODE)S
-2 x(_NAME")S 240 x(COUNT)S 239 x(100!)S 444 x(Beat)S 240 x(up)S
597 y 6888 X(Ethernet)S 897 y 5991 X(\201)S 595 x(NCP>)S 209 x(SHO)S
209 x(COUNT)S 209 x(LINE)S 209 x(UNA-0)S 210 x(!)S 352 x(Send,)S
222 x(receive,)S 222 x(collision)S 209 x(detect)S 598 y 6888 X
(failures?)S 896 y 5991 X(\201)S 595 x(NCP>)S 137 x(SHO)S 138 x
(COUNT)S 137 x(CIRC)S 136 x(UNA-0)S 138 x(!)S 212 x(Circ)S 138 x
(down?)S 212 x(DECNET)S 137 x(Bouncing?)S 897 y 5991 X(\201)S 595 x
($)S 166 x(SHO)S 165 x(DEV)S 165 x(ET)S 166 x(\(XE,)S 166 x(XQ,)S
165 x(ES\))S 166 x(!)S 166 x(Errors)S 166 x(on)S 167 x(Ethernet)S
166 x(Device?)S 29901 Y 4796 X F152(8\2034)S 498 x(LA)S -37 x(T)S
166 x(Cheat)S 166 x(Sheet)S 2 x(s)S
PP
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%%DOC$Page: 8-5 55
1000 BP 39600 30600 PM 0 0 XY
4125 Y 4796 X F24(8.3)S 348 x(DECs)S -2 x(erver)S 233 x(problem)S
232 x(cheat)S 232 x(sheet)S 5321 Y 5991 X F151(\201)S 595 x(Problem)S
166 x(on)S 166 x(multiple)S 166 x(servers?)S 896 y 5991 X(\201)S
595 x(Problem)S 166 x(on)S 166 x(multiple)S 166 x(ports?)S 897 y
5991 X(\201)S 595 x(-Local-)S 166 x(error)S 167 x(message)S 165 x
(on)S 167 x(ports)S 165 x(when)S 167 x(error)S 166 x(occurs?)S 8907 Y
5991 X(If)S 166 x(multiple)S 165 x(servers;)S 897 y 5991 X(\201)S
595 x($)S 166 x(SHO)S 165 x(DEV)S 165 x(XE)S 165 x(!)S 167 x(look)S
166 x(for)S 166 x(errors)S 167 x(on)S 166 x(Ethernet)S 166 x(device)S
896 y 5991 X(\201)S 595 x(LCP>)S 166 x(SHO)S 165 x(COUNT)S 166 x(!)S
166 x(look)S 167 x(for)S 166 x(Xmit)S 165 x(errors.)S 222 x(Last)S
166 x(Xmit)S 165 x(fail)S 166 x(code?)S 897 y 5991 X(\201)S 595 x($)S
166 x(EXIT)S 165 x(%X)S 166 x(NN)S 166 x(!)S 166 x(where)S 166 x
("NN")S 166 x(is)S 166 x(last)S 165 x(Xmit)S 165 x(fail)S 166 x
(code.)S 897 y 5991 X(\201)S 595 x(NCP>)S 183 x(SHO)S 182 x(CIRC)S
182 x(UNA-0)S 182 x(COUNT)S 183 x(!)S 183 x(Circ)S 183 x(down-)S
183 x(Has)S 183 x(DECNE)S -2 x(T)S 184 x(been)S 598 y 6888 X
(bouncing?)S 896 y 5991 X(\201)S 595 x(NCP>)S 137 x(SHO)S 136 x
(LINE)S 137 x(UNA-0)S 137 x(COUNT)S 136 x(!)S 138 x(Send,)S 144 x
(receive)S 138 x(failures?)S 212 x(How)S 136 x(long)S 598 y 6888 X
(since)S 166 x(zeroed?)S 897 y 5991 X(\201)S 595 x(NCP>)S 165 x
(ZERO)S 166 x(LINE)S 165 x(UNA-0)S 166 x(COUNT)S 165 x(!)S 167 x
(Zero)S 167 x(counters)S 896 y 5991 X(\201)S 595 x(NCP>)S 196 x
(LOOP)S 196 x(NODE)S 196 x("V)S -56 x(AX_NOD)S -2 x(E_NAME")S 196 x
(COUNT)S 196 x(1000)S 197 x(!)S 314 x(beat)S 196 x(up)S 598 y 6888 X
(ethernet.)S 897 y 5991 X(\201)S 595 x(NCP>)S 165 x(SHO)S 166 x
(LINE)S 165 x(UNA-0)S 166 x(COUNT)S 165 x(!)S 167 x(Check)S 167 x
(count)S 166 x(again.)S 896 y 5991 X(\201)S 595 x($)S 219 x(SHO)S
218 x(MEM/POOL/FULL)S 221 x(!)S 219 x(check)S 221 x(curr)S 220 x(&)S
219 x(initial)S 219 x(SRPs,IRPs,LRPs-)S 598 y 6888 X(Expanding?)S
21161 Y 5991 X(On)S 166 x(Server;)S 167 x(\(Whether)S 167 x(problem)S
166 x(is)S 165 x(on)S 167 x(multiple)S 165 x(or)S 167 x(single)S
166 x(servers\))S 897 y 5991 X(\201)S 595 x(Local>)S 166 x(SET)S
166 x(PRIV)S 897 y 5991 X(\201)S 595 x(Local>)S 123 x(SHO)S 122 x
(COUNT)S 123 x(!)S 124 x(Examine)S 123 x(right)S 124 x(side)S 123 x
(columns)S 123 x(for)S 123 x(Ethernet)S 124 x(prob.)S 896 y 5991 X
(\201)S 595 x(Local>)S 180 x(SHO)S 179 x(SER)S -19 x(VER)S 179 x(ST)S
-28 x(A)S -27 x(T)S 180 x(!)S 180 x(Look)S 181 x(for)S 180 x(port)S
180 x(errors,)S 184 x(CPU,)S 181 x(MEMOR)S -19 x(Y)S 598 y 6888 X
(utilization.)S 267 x(!)S 269 x(Compare)S 181 x(server)S 182 x
(version)S 182 x(#')S -19 x(s)S 181 x(for)S 182 x(known)S 182 x
(probs.,)S 186 x(!)S 269 x(Check)S 598 y 6888 X(Server)S 167 x(&)S
166 x(Software)S 165 x(Status)S 165 x(codes)S 166 x(for)S 166 x
(crash.)S 896 y 5991 X(\201)S 595 x(Local>)S 183 x(SHO)S 182 x(PORT)S
182 x(X)S 182 x(COUNT)S 182 x(!)S 184 x(Check)S 183 x(for)S 183 x
(Framing,)S 188 x(Overrun)S 184 x(errors)S 598 y 6888 X(on)S 166 x
(ports.)S 897 y 5991 X(\201)S 595 x(If)S 165 x(DEC500)S 165 x(or)S
166 x(DECSA;)S 896 y 5991 X(\201)S 595 x(Local>)S 166 x(SHO)S 165 x
(DEV)S 165 x(COUNT)S 166 x(!)S 166 x(look)S 167 x(at)S 165 x(device)S
167 x(error)S 167 x(counters.)S 29901 Y 17286 X F152(LA)S -37 x(T)S
166 x(Cheat)S 167 x(Sheets)S 499 x(8\2035)S
PP
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10574 Y 4796 X F20(Appendix)S 895 x(A)S 349 y 4796 X 17928 24 R
11922 Y 4796 X("Patc)S -2 x(hes?)S 10625 X(W)S -16 x(e)S 638 x(don')S
638 x(need)S 638 x(no)S 638 x(stinkin')S 12919 Y 4796 X(pat)S -2 x
(ches!)S -2 x(")S 14936 Y 4796 X F24(A.1)S 347 x(History)S 232 x
(Marches)S 232 x(On)S 16729 Y 5991 X F151(This)S 188 x(section)S
188 x(is)S 187 x(devoted)S 188 x(to)S 188 x(L)S -27 x(TDRIVER)S 186 x
(and)S 188 x(LA)S -27 x(TSYM)S 187 x(patch)S 188 x(information,)S
598 y 5991 X(primarily)S 123 x(extracted)S 123 x(from)S 123 x(the)S
123 x(LA)S -28 x(T)S 123 x(notes)S 123 x(conference.)S 208 x(As)S
122 x(you)S 124 x(may)S 123 x(be)S 123 x(aware)S 598 y 5991 X(by)S
245 x(now)S -46 x(,)S 264 x(there)S 245 x(were)S 244 x(many)S 245 x
(different)S 244 x(revisions)S 244 x(of)S 244 x(LA)S -27 x
(TSYM.EXE,)S 244 x(which)S 597 y 5991 X(\211xed)S 148 x(various)S
147 x(and)S 147 x(sundry)S 148 x(problems.)S 215 x(A)S 146 x(brief)S
147 x(summary)S 147 x(of)S 147 x(where)S 147 x(we)S 146 x(stand:)S
20316 Y 5991 X(For)S 319 x(VMS)S 318 x(4.7,)S 357 x(LA)S -28 x(TSYM)S
318 x(2.7-003)S 319 x(\211xes)S 318 x(all)S 318 x(known)S 319 x
(problems)S 318 x(in)S 319 x(LA)S -28 x(T-)S 597 y 5991 X(SYM.)S
180 x(THIS)S 179 x(DOES)S 179 x(NOT)S 179 x(MEAN)S 179 x(EVER)S -19 x
(Y)S 179 x(RPQ)S 179 x(PROBLEM)S 179 x(SHOULD)S 179 x(BE)S 598 y
5991 X(WOLR'd)S 157 x(for)S 159 x(2.7!!!)S 221 x(Only)S 159 x(if)S
158 x(you)S 160 x(follow)S 157 x(the)S 159 x(troubleshooting)S 160 x
(procedures)S 159 x(and)S 598 y 5991 X(determine)S 229 x(that)S 230 x
(a)S 229 x(customer)S 229 x(is)S 229 x(seeing)S 230 x(a)S 229 x
(de\211nite)S 229 x("known)S 230 x(footprint")S 229 x(of)S 229 x(a)S
598 y 5991 X(LA)S -27 x(TSYM)S 166 x(problem)S 166 x(should)S 166 x
(the)S 166 x(call)S 166 x(be)S 166 x(WOLR'd.)S 24500 Y 5991 X(As)S
264 x(regards)S 266 x(the)S 265 x(L)S -27 x(TDRIVE)S -2 x(R,)S 265 x
(X7N-18)S 265 x(is)S 264 x(the)S 265 x(4.7)S 266 x(\211x)S 265 x
(for)S 266 x(INCO)S -2 x(NST)S -27 x(A)S -28 x(TE)S 598 y 5991 X
(crashes)S 239 x(which)S 238 x(\211t)S 239 x(the)S 239 x(L)S -27 x
(TDRIV)S -2 x(ER)S 238 x(footprint)S 239 x(\(P)S -64 x(.C.=)S 238 x
(CLRL)S 239 x(44\(R4\))S 238 x([R0]\).)S 597 y 5991 X(It)S 168 x
(should)S 169 x(be)S 168 x(noted)S 169 x(that)S 168 x(the)S 168 x(L)S
-27 x(TDRIVER)S 167 x(\211x)S 169 x(in)S 169 x(X7N-18)S 167 x(for)S
169 x(VMS)S 168 x(4.6-7)S 169 x(did)S 598 y 5991 X(not)S 180 x(make)S
181 x(it)S 180 x(into)S 180 x(VMS)S 180 x(5.0-0')S -19 x(s)S 180 x
(L)S -27 x(TDRIVE)S -2 x(R.)S 181 x(Thus,)S 184 x(INCONST)S -28 x(A)S
-28 x(TE)S 180 x(crashes)S 598 y 5991 X(or)S 204 x(a)S 204 x(Last)S
203 x(Failure)S 204 x(Code)S 204 x(of)S 203 x(34C)S 204 x(in)S 203 x
(LA)S -27 x(TCP')S -19 x(s)S 204 x(counters)S 204 x(may)S 204 x(be)S
204 x(seen.)S 335 x(The)S 598 y 5991 X(Solution)S 166 x(is)S 166 x
(to)S 166 x(upgrade)S 167 x(to)S 166 x(VMS)S 165 x(5.0-1,)S 167 x
(which)S 167 x(has)S 166 x(the)S 166 x(\211x)S 167 x(in)S 166 x(L)S
-27 x(TDRIVE)S -2 x(R.)S 29901 Y 11115 X F152("Patches?)S 223 x(W)S
-37 x(e)S 167 x(don')S 166 x(need)S 167 x(no)S 167 x(stinkin')S 166 x
(patches!")S 500 x(A\2031)S
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4104 Y 4796 X F24(A.2)S 347 x(Look)S 233 x(Back)S 231 x(in)S 232 x
(Anger)S 5698 Y 4796 X F36(Figure)S 167 x(A\2031:)S 497 x(Ltdriver)S
-26 x(,)S 166 x(Latsym)S 166 x(revision)S 167 x(charts)S 710 y 8292 X
F98(<<<)S 269 x(BAGELS::SYS$SYSDEVICE:[NOTES$LIBRARY]LAT.NOTE;3)S
269 x(>>>)S 498 y 12058 X(-<)S 269 x(LAT)S 269 x(notes)S 269 x
(conference)S 269 x(>-)S 499 y 4796 X
(====================================================================)S
(============)S 498 y 4796 X(Note)S 268 x(1478.0)S 9637 X(Current)S
269 x(LTDRIVER)S 269 x(edit/release)S 269 x(information)S 269 x(...)S
24432 X(1)S 269 x(reply)S 498 y 4796 X(CSC32::J_HASSENCAHL)S 268 x
("John)S 269 x(Hassencahl)S 269 x(CSC/CS)S 269 x(NSU")S 19052 X(46)S
269 x(lines)S 538 x(21-APR-1988)S 269 x(14:40)S 498 y 4796 X
(--------------------------------------------------------------------)S
(------------)S 9995 Y 5871 X(The)S 269 x(following)S 269 x(is)S
269 x(the)S 269 x(current)S 269 x(edit)S 269 x(history)S 269 x(of)S
269 x(the)S 269 x(LTDRIVER.)S 538 x(As)S 269 x(many)S 498 y 5871 X
(of)S 269 x(you)S 269 x(may)S 269 x(have)S 269 x(noted,)S 269 x(the)S
269 x(current)S 269 x(version)S 269 x(of)S 269 x(the)S 269 x
(LTDRIVER)S 269 x(for)S 498 y 5871 X(v4.6/v4.7)S 269 x(of)S 269 x
(VMS)S 269 x(is)S 269 x(X7N-18.)S 538 x(As)S 269 x(noted)S 269 x
(below,)S 269 x(this)S 269 x(new)S 269 x(fix)S 269 x(is)S 269 x(to)S
498 y 5871 X(address)S 269 x(a)S 269 x(problem)S 269 x(with)S 269 x
(the)S 269 x('READPORT')S 269 x(qio)S 269 x(that)S 269 x(might)S
269 x(result)S 269 x(in)S 269 x(a)S 498 y 5871 X(PGFLIPLHI,)S 269 x
('page)S 269 x(fault)S 269 x(ipl)S 269 x(too)S 269 x(high')S 269 x
(system)S 269 x(crash.)S 538 x(More)S 269 x(often)S 269 x(than)S
499 y 5871 X(not,)S 269 x(the)S 269 x(system)S 269 x(will)S 269 x
(crash)S 269 x(on)S 269 x(a)S 269 x('MOVC3')S 269 x(instruction)S
269 x(in)S 269 x(the)S 269 x(LTDRIVER.)S 498 y 5871 X(This)S 269 x
(should)S 269 x(be)S 269 x(verified)S 269 x(through)S 269 x(crash)S
269 x(dump)S 269 x(analysis)S 269 x(so)S 269 x(as)S 269 x(not)S 269 x
(to)S 498 y 5871 X(send)S 269 x(this)S 269 x(new)S 269 x(LTDRIVER)S
269 x(to)S 269 x(fix)S 269 x(a)S 269 x(problem)S 269 x(for)S 269 x
(which)S 269 x(it)S 269 x(is)S 269 x(not)S 269 x(designed.)S 797 y
5871 X
(====================================================================)S
797 y 4796 X(;)S 268 x(.TITLE)S 269 x(LTDRIVER)S 269 x(-)S 269 x
(Local)S 269 x(Area)S 269 x(Terminal)S 269 x(Port)S 269 x(Driver)S
498 y 4796 X(;)S 268 x(.IDENT)S 269 x('LAT)S 269 x(X7N-18')S 498 y
4796 X(;)S 498 y -269 x(;)S 268 x(Revision)S 269 x(history:)S 498 y
4796 X(;)S 268 x(X7N-18)S 269 x(Fix)S 269 x(possible)S 269 x(crash)S
269 x(due)S 269 x(to)S 269 x(improper)S 269 x(access)S 269 x(to)S
269 x(user)S 499 y 4796 X(;)S 537 x(arguments)S 269 x(in)S 269 x
(READPORT)S 269 x(routine)S 498 y 4796 X(;)S 498 y -269 x(;)S 268 x
(X7N-17)S 269 x(Fix)S 269 x(possible)S 269 x(message)S 269 x
(corruption)S 269 x(and)S 269 x(crash)S 269 x(in)S 269 x(FFIDONE)S
498 y 4796 X(;)S 537 x(due)S 269 x(to)S 269 x(an)S 269 x(attempt)S
269 x(to)S 269 x(send)S 269 x(a)S 269 x(second)S 269 x(message)S
269 x(while)S 269 x(building)S 498 y 4796 X(;)S 537 x(a)S 269 x
(first.)S 498 y 4796 X(;)S 498 y -269 x(;)S 268 x(X7N-16)S 269 x
(Fix)S 269 x(problem)S 269 x(of)S 269 x(reading)S 269 x(data)S 269 x
(from)S 269 x(application)S 269 x(port)S 498 y 4796 X(;)S 537 x
(more)S 269 x(slowly)S 269 x(than)S 269 x(it)S 269 x(is)S 269 x
(delivered.)S 499 y 4796 X(;)S 498 y -269 x(;)S 268 x(X7N-15)S 269 x
(Add)S 269 x(CANCEL)S 269 x(support)S 269 x(by)S 269 x(copying)S
269 x(class)S 269 x(driver's)S 269 x(DDT)S 269 x(to)S 498 y 4796 X
(;)S 537 x(our)S 269 x(own,)S 269 x(then)S 269 x(replacing)S 269 x
(CANCEL)S 269 x(entry)S 269 x(point)S 269 x(with)S 269 x(our)S 269 x
(own)S 498 y 4796 X(;)S 498 y -269 x(;)S 268 x(X7N-14)S 269 x(Fix)S
269 x(system)S 269 x(crash)S 269 x(on)S 269 x(LT$CONNECT,)S 269 x
(LT$DISCON_QIO)S 269 x(if)S 269 x(we're)S 498 y 4796 X(;)S 537 x
(given)S 269 x(a)S 269 x(VT)S 269 x(UCB.)S 538 x(If)S 269 x(we)S
269 x(get)S 269 x(a)S 269 x(VT)S 269 x(UCB,)S 269 x(always)S 269 x
(return)S 498 y 4796 X(;)S 537 x(SS$_ILLIOFUNC,)S 269 x(since)S 269 x
(an)S 269 x(application)S 269 x(port)S 269 x(will)S 269 x(never)S
499 y 4796 X(;)S 537 x(have)S 269 x(an)S 269 x(associated)S 269 x
(VT.)S 498 y 4796 X(;)S 498 y -269 x(;)S 268 x(X7N-13)S 269 x(In)S
269 x(LOOP_ABORT,)S 269 x(just)S 269 x(turn)S 269 x(around)S 269 x
(a)S 269 x(STOP)S 269 x(SLOT)S 269 x(using)S 269 x(the)S 498 y 4796 X
(;)S 537 x(received)S 269 x(SRCID.)S 538 x(DOn't)S 269 x(harm)S 269 x
(the)S 269 x(target)S 269 x(UCB)S 269 x(since)S 269 x(it's)S 498 y
4796 X(;)S 537 x(probably)S 269 x(not)S 269 x(the)S 269 x(guilty)S
269 x(party.)S 28242 Y 4796 X F36(Figure)S 167 x(A\2031)S 165 x
(Cont'd)S 2 x(.)S 166 x(on)S 167 x(next)S 166 x(page)S 29901 Y 4796 X
F152(A\2032)S 497 x("Patch)S 2 x(es?)S 222 x(W)S -37 x(e)S 166 x
(don')S 167 x(need)S 167 x(no)S 166 x(stinkin')S 167 x(patches!")S
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3975 Y 4796 X F36(Figure)S 167 x(A\2031)S 248 x(\(Cont.\):)S 499 x
(Ltdriver)S -27 x(,)S 167 x(Latsym)S 166 x(revision)S 167 x(charts)S
515 y 4796 X F98(;)S 498 y -269 x(;)S 268 x(X7N-12)S 269 x(Fix)S
269 x(crash)S 269 x(in)S 269 x(LT$STOPCIRC)S 269 x(if)S 269 x(we)S
269 x(can't)S 269 x(get)S 269 x(a)S 269 x(transmit)S 498 y 4796 X(;)S
537 x(buffer,)S 269 x(just)S 269 x(ignore)S 269 x(the)S 269 x
(problem.)S 498 y 4796 X(;)S 537 x(Fix)S 269 x(possible)S 269 x
(port)S 269 x(hang)S 269 x(and)S 269 x("repeat)S 269 x(create)S 269 x
(of)S 269 x(slot)S 269 x(by)S 498 y 4796 X(;)S 537 x(server")S 269 x
(if)S 269 x(channels)S 269 x(assigned)S 269 x(to)S 269 x(UCB.)S 498 y
4796 X(;)S 499 y -269 x(;)S 268 x(X7N-10)S 269 x(Fix)S 269 x(8800)S
269 x(crash)S 269 x(on)S 269 x(a)S 269 x(STOP)S 269 x(NODE)S 269 x
(command.)S 498 y 4796 X(;)S 498 y -269 x(;)S 268 x(X7N-9)S 807 x
(Change)S 269 x(BADMCKCOD)S 269 x(to)S 269 x(INCONSTATE.)S 498 y
4796 X
(====================================================================)S
(============)S 10069 Y 8292 X(<<<)S 269 x
(BAGELS::SYS$SYSDEVICE:[NOTES$LIBRARY]LAT.NOTE;3)S 269 x(>>>)S 498 y
12058 X(-<)S 269 x(LAT)S 269 x(notes)S 269 x(conference)S 269 x(>-)S
498 y 4796 X
(====================================================================)S
(============)S 498 y 4796 X(Note)S 268 x(1477.0)S 9368 X(Current)S
269 x(LATSYM)S 269 x(release/version)S 269 x(information)S 269 x
(...)S 24432 X(1)S 269 x(reply)S 498 y 4796 X(CSC32::J_HASSENCAHL)S
268 x("John)S 269 x(Hassencahl)S 269 x(CSC/CS)S 269 x(NSU")S 18783 X
(168)S 269 x(lines)S 538 x(21-APR-1988)S 269 x(14:19)S 499 y 4796 X
(--------------------------------------------------------------------)S
(------------)S 13655 Y 5871 X(The)S 269 x(following)S 269 x(is)S
269 x(from)S 269 x(LAT/VMS)S 269 x(Engineering.)S 538 x(It)S 269 x
(is)S 269 x(an)S 269 x(attempt)S 269 x(to)S 269 x(explain)S 499 y
5871 X(the)S 269 x(history)S 269 x(the)S 269 x(LAT/VMS)S 269 x
(software)S 269 x(and)S 269 x(in)S 269 x(paticular)S 269 x(the)S
269 x(LATSYM)S 269 x(image)S 269 x(and)S 498 y 5871 X(the)S 269 x
(associated)S 269 x(problems)S 269 x(that)S 269 x(are)S 269 x(fixed)S
269 x(by)S 269 x(the)S 269 x(various)S 269 x(versions.)S 797 y 5871 X
(====================================================================)S
(=)S 797 y 4796 X(A)S 268 x(print)S 269 x(symbiont)S 269 x(which)S
269 x(allowed)S 269 x(printing)S 269 x(to)S 269 x(devices)S 269 x
(connected)S 269 x(to)S 269 x(terminal)S 498 y 4796 X(servers)S 268 x
(was)S 269 x(first)S 269 x(shipped)S 269 x(with)S 269 x(LATplus/VMS)S
269 x(V1.0,)S 269 x(which)S 269 x(required)S 269 x(VMS)S 269 x
(V4.2.)S 498 y 4796 X(This)S 268 x(symbiont)S 269 x(\(named)S 269 x
(LATSYM\),)S 269 x(along)S 269 x(with)S 269 x(its)S 269 x
(associated)S 269 x(driver)S 269 x(\(LTDRIVER\),)S 498 y 4796 X
(implemented)S 268 x(version)S 269 x(5.1)S 269 x(of)S 269 x(the)S
269 x(LAT)S 269 x(protocol.)S 538 x(This)S 269 x(version)S 269 x
(included)S 269 x(new)S 498 y 4796 X(features)S 268 x(to)S 269 x
(allow)S 269 x(host)S 269 x(LAT)S 269 x(systems)S 269 x(to)S 269 x
(solicit)S 269 x(connections)S 269 x(to)S 269 x(terminal)S 269 x
(server)S 498 y 4796 X(services)S 268 x(and)S 269 x(ports.)S 538 x
(The)S 269 x(LATplus/VMS)S 269 x(kit)S 269 x(was)S 269 x(shipped)S
269 x(with)S 269 x(server)S 269 x(software)S 498 y 4796 X(kits)S
268 x(designed)S 269 x(to)S 269 x(be)S 269 x(installed)S 269 x(on)S
269 x(VMS)S 269 x(nodes,)S 269 x(and)S 269 x(was)S 269 x(not)S 269 x
(related)S 269 x(to)S 269 x(the)S 499 y 4796 X(release)S 268 x(of)S
269 x(a)S 269 x(specific)S 269 x(version)S 269 x(of)S 269 x(the)S
269 x(VMS)S 269 x(operating)S 269 x(system;)S 269 x(it)S 269 x
(could)S 269 x(be)S 498 y 4796 X(installed)S 268 x(on)S 269 x(any)S
269 x(version)S 269 x(of)S 269 x(VMS)S 269 x(between)S 269 x(V4.2)S
269 x(and)S 269 x(V4.5)S 269 x(inclusive.)S 797 y 4796 X(Prior)S
268 x(versions)S 269 x(of)S 269 x(VMS,)S 269 x(as)S 269 x(well)S
269 x(as)S 269 x(versions)S 269 x(V4.2)S 269 x(through)S 269 x(V4.5)S
269 x(which)S 269 x(did)S 269 x(not)S 498 y 4796 X(include)S 268 x
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(did)S 269 x(not)S 269 x(implement)S 269 x(version)S 269 x(5.1)S
269 x(of)S 498 y 4796 X(the)S 268 x(LAT)S 269 x(protocol,)S 269 x
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(printing)S 269 x(to)S 269 x(remote)S 269 x(printers.)S 498 y 4796 X
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(LTDRIVER)S 269 x(which)S 269 x(only)S 269 x(implemented)S 269 x
(V5.0)S 269 x(of)S 269 x(the)S 269 x(LAT)S 498 y 4796 X(protocol.)S
797 y 4796 X(The)S 268 x(release)S 269 x(of)S 269 x(VMS)S 269 x
(V4.6)S 269 x(included)S 269 x(support)S 269 x(for)S 269 x(LAT)S
269 x(protocol)S 269 x(version)S 269 x(V5.1.)S 538 x(A)S 498 y 4796 X
(new)S 268 x(LATSYM)S 269 x(\(completely)S 269 x(rewritten)S 269 x
(to)S 269 x(be)S 269 x(multithreaded\),)S 269 x(an)S 269 x(updated)S
269 x(LTDRIVER,)S 499 y 4796 X(and)S 268 x(a)S 269 x(version)S 269 x
(of)S 269 x(LATCP)S 269 x(that)S 269 x(included)S 269 x(several)S
269 x(bug)S 269 x(fixes)S 269 x(were)S 269 x(now)S 269 x(supplied)S
269 x(with)S 498 y 4796 X(VMS.)S 537 x(There)S 269 x(was)S 269 x(no)S
269 x(need)S 269 x(to)S 269 x(install)S 269 x(the)S 269 x
(LATplus/VMS)S 269 x(layered)S 269 x(product,)S 269 x(and)S 269 x
(in)S 498 y 4796 X(fact,)S 268 x(the)S 269 x(LAT)S 269 x(components)S
269 x(now)S 269 x(included)S 269 x(with)S 269 x(VMS)S 269 x(were)S
269 x(more)S 269 x(up)S 269 x(to)S 269 x(date)S 269 x(than)S 269 x
(the)S 498 y 4796 X(older)S 268 x(version)S 269 x(furnished)S 269 x
(with)S 269 x(LATplus/VMS.)S 27911 Y 4796 X F36(Figure)S 167 x
(A\2031)S 165 x(Cont'd)S 2 x(.)S 166 x(on)S 167 x(next)S 166 x(page)S
29901 Y 11115 X F152("Patches?)S 223 x(W)S -37 x(e)S 167 x(don')S
166 x(need)S 167 x(no)S 167 x(stinkin')S 166 x(patches!")S 500 x
(A\2033)S
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3975 Y 4796 X F36(Figure)S 167 x(A\2031)S 248 x(\(Cont.\):)S 499 x
(Ltdriver)S -27 x(,)S 167 x(Latsym)S 166 x(revision)S 167 x(charts)S
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(----------------------------------------------------------------)S
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([)S 269 x(V1.0)S 269 x(---)S 269 x(V1.1)S 269 x(---)S 269 x(V1.2)S
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(LATSYM)S 20397 X(V2.0)S 807 x(V2.1)S 538 x(V5.0-005)S 9073 Y 4796 X
(LATSYM)S 268 x(V2.0)S 269 x(was)S 269 x(a)S 269 x(new,)S 269 x
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269 x(in)S 269 x(V2.1:)S 797 y 6140 X(o)S 269 x(When)S 269 x
(printing)S 269 x(many)S 269 x(short)S 269 x(files)S 269 x(one)S
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269 x(try)S 498 y 5065 X(to)S 268 x(start)S 269 x(up)S 269 x(a)S
269 x(new)S 269 x(LAT)S 269 x(connection)S 269 x(while)S 269 x(the)S
269 x(terminal)S 269 x(server)S 269 x(and)S 269 x(LTDRIVER)S 498 y
5065 X(were)S 268 x(still)S 269 x(disconnecting)S 269 x(the)S 269 x
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(the)S 269 x(connection)S 269 x(had)S 269 x(been)S 499 y 5065 X
(successfully)S 268 x(established,)S 269 x(the)S 269 x(queue)S 269 x
(would)S 269 x(then)S 269 x(be)S 269 x(paused.)S 16046 Y 4796 X
(Problem\(s\))S 268 x(fixed)S 269 x(in)S 269 x(V2.2:)S 797 y 6140 X
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(device,)S 269 x(LATSYM)S 269 x(would)S 269 x(not)S 269 x(properly)S
269 x(handle)S 269 x(buffer)S 269 x(data)S 498 y 5065 X(received)S
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5065 X(same)S 268 x(printer,)S 269 x(or)S 269 x(application)S 269 x
(programs)S 269 x(allocating)S 269 x(the)S 269 x(spooled)S 269 x
(device)S 498 y 5065 X(would)S 268 x(typically)S 269 x(be)S 269 x
(the)S 269 x(cause)S 269 x(of)S 269 x(this)S 269 x(error.)S 538 x
(This)S 269 x(lead)S 269 x(to)S 269 x(many)S 269 x(strange)S 498 y
5065 X(symptoms,)S 268 x(including)S 269 x(LATSYM)S 269 x(crashes,)S
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(writing)S 498 y 5065 X(output)S 268 x(data,)S 269 x(invalid)S 269 x
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269 x(allocate)S 269 x(operation)S 269 x(ten)S 269 x(times,)S 498 y
5065 X(with)S 268 x(a)S 269 x(five)S 269 x(second)S 269 x(timer)S
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(retry)S 269 x(counter)S 499 y 5065 X(expired,)S 268 x(the)S 269 x
(queue)S 269 x(would)S 269 x(be)S 269 x(paused)S 269 x(and)S 269 x
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(already)S 268 x(allocated)S 269 x(by)S 269 x(another)S 269 x(user")S
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(bug,)S 269 x(which)S 269 x(would)S 269 x(cause)S 269 x(LATSYM)S
269 x(to)S 269 x(die)S 269 x(with)S 269 x(a)S 498 y 5065 X
("unexpected)S 268 x(symbiont)S 269 x(process)S 269 x(termination")S
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498 y 5065 X(when)S 268 x(printing)S 269 x(files)S 269 x(containing)S
269 x(binary)S 269 x(data,)S 269 x(such)S 269 x(as)S 269 x(LN03)S
269 x(fonts)S 269 x(or)S 498 y 5065 X(SETHOST.LOG)S 268 x(files)S
269 x(with)S 269 x(SET)S 269 x(TERM/INQUIRE)S 269 x(escape)S 269 x
(sequences.)S 26921 Y 4796 X F36(Figure)S 167 x(A\2031)S 165 x
(Cont'd)S 2 x(.)S 166 x(on)S 167 x(next)S 166 x(page)S 29901 Y 4796 X
F152(A\2034)S 497 x("Patch)S 2 x(es?)S 222 x(W)S -37 x(e)S 166 x
(don')S 167 x(need)S 167 x(no)S 166 x(stinkin')S 167 x(patches!")S
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3975 Y 4796 X F36(Figure)S 167 x(A\2031)S 248 x(\(Cont.\):)S 499 x
(Ltdriver)S -27 x(,)S 167 x(Latsym)S 166 x(revision)S 167 x(charts)S
814 y 6140 X F98(o)S 269 x(A)S 269 x(new)S 269 x(version)S 269 x(of)S
269 x(LTDRVIER)S 269 x(was)S 269 x(also)S 269 x(made)S 269 x
(available)S 269 x(with)S 269 x(this)S 269 x(version)S 269 x(of)S
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(\(version)S 269 x(X7N-15\))S 269 x(should)S 269 x(eliminate)S 269 x
(the)S 269 x(cause)S 269 x(of)S 498 y 5065 X(symbionts)S 268 x
(going)S 269 x(into)S 269 x(the)S 269 x(RWAST)S 269 x(state.)S 538 x
(Because)S 269 x(of)S 269 x(some)S 269 x(of)S 269 x(the)S 269 x
(problems)S 498 y 5333 X(listed)S 269 x(above,)S 269 x(LATSYM)S 269 x
(sometimes)S 269 x(got)S 269 x(into)S 269 x(a)S 269 x(situation)S
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(unable)S 268 x(to)S 269 x(recover.)S 538 x(When)S 269 x(it)S 269 x
(detected)S 269 x(such)S 269 x(a)S 269 x(condition,)S 269 x(LATSYM)S
269 x(would)S 498 y 5065 X(attempt)S 268 x(to)S 269 x(abort)S 269 x
(itself)S 269 x(and)S 269 x(take)S 269 x(a)S 269 x(process)S 269 x
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268 x(were)S 269 x(queued)S 269 x(on)S 269 x(terminal)S 269 x
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5065 X(in)S 268 x(RWAST)S 269 x(state.\))S 10866 Y 4796 X
(Problem\(s\))S 268 x(fixed)S 269 x(in)S 269 x(V2.4:)S 797 y 6140 X
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(maximum)S 269 x(number)S 269 x(of)S 269 x(supported)S 269 x
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(cause)S 269 x(print)S 269 x(requests)S 269 x(on)S 269 x(the)S 269 x
(last)S 269 x(stream)S 269 x(\(queue\))S 269 x(to)S 269 x(be)S 269 x
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269 x("%SYSTEM-F-ABORT,)S 269 x(abort")S 269 x(error)S 269 x
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(Problem\(s\))S 268 x(fixed)S 269 x(in)S 269 x(V2.5:)S 797 y 6140 X
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5065 X("Stalled")S 268 x(state.)S 538 x(However,)S 269 x(it)S 269 x
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6947 X(already)S 269 x(allocated)S 269 x(to)S 269 x(another)S 269 x
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28515 Y 4796 X F36(Figure)S 167 x(A\2031)S 165 x(Cont'd)S 2 x(.)S
166 x(on)S 167 x(next)S 166 x(page)S 29901 Y 11115 X F152("Patches?)S
223 x(W)S -37 x(e)S 167 x(don')S 166 x(need)S 167 x(no)S 167 x
(stinkin')S 166 x(patches!")S 500 x(A\2035)S
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3975 Y 4796 X F36(Figure)S 167 x(A\2031)S 248 x(\(Cont.\):)S 499 x
(Ltdriver)S -27 x(,)S 167 x(Latsym)S 166 x(revision)S 167 x(charts)S
814 y 5065 X F98(Note)S 268 x(that)S 269 x(because)S 269 x(of)S 269 x
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(retried)S 269 x(forever.)S 538 x(If)S 269 x(the)S 269 x(previous)S
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(will)S 499 y 5065 X(eventually)S 268 x(make)S 269 x(it)S 269 x(go)S
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(queue)S 269 x(pauses)S 269 x(due)S 269 x(to)S 498 y 5065 X
(printers)S 268 x(running)S 269 x(out)S 269 x(of)S 269 x(paper)S
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(completes.)S 797 y 6140 X(o)S 269 x(If)S 269 x(a)S 269 x(print)S
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5065 X(be)S 268 x(output)S 269 x(on)S 269 x(another)S 269 x(\(the)S
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(This)S 269 x(allows)S 269 x(other)S 269 x(applications)S 269 x(to)S
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5065 X(spooled)S 268 x(LTAx:)S 269 x(device)S 269 x(and)S 269 x
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10574 Y 4796 X F20(Appendix)S 895 x(B)S 349 y 4796 X 17928 24 R
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500 x(B\2031)S
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4125 Y 4796 X F24(B.2)S 347 x(\203)S 233 x(Ethernet)S 233 x
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500 x(B\2033)S
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4125 Y 4796 X F24(B.3)S 347 x(\203)S 233 x(VMS)S 232 x(V5)S 233 x
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3975 Y 4796 X F36(Figure)S 167 x(B\2031)S 248 x(\(Cont.\):)S 499 x
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13941 X(SYS-215)S 498 y 5333 X(With)S 269 x(The)S 269 x($GETDVI)S
269 x(System)S 499 y 5333 X(Service)S 269 x(\(F$GETDVI\))S 797 y
4796 X(LAT)S 268 x(Port)S 269 x(Driver)S 269 x(QIO)S 269 x
(Interface)S 807 x(VMS)S 269 x(I/O)S 269 x(User's)S 269 x(Reference)S
269 x(Manual:)S 269 x(Part)S 269 x(I,)S 498 y 13941 X(8-49)S 269 x
(to)S 269 x(8-53,)S 269 x(8-59,)S 269 x(8-73)S 269 x(to)S 269 x
(8-83)S 797 y 4796 X(LTLOAD)S 268 x(Example)S 13403 X(Guide)S 269 x
(To)S 269 x(Setting)S 269 x(Up)S 269 x(A)S 269 x(VMS)S 269 x
(System,)S 269 x(2-16)S 498 y 13941 X(to)S 269 x(2-17)S 797 y 4796 X
(Overview)S 268 x(Of)S 269 x(LAT)S 269 x(On)S 269 x(VAX/VMS)S 13403 X
(Guide)S 269 x(To)S 269 x(Setting)S 269 x(Up)S 269 x(A)S 269 x(VMS)S
269 x(System,)S 269 x(7-1)S 269 x(to)S 498 y 13941 X(7-6)S 797 y
4796 X(Programming)S 268 x(A)S 269 x(Dedicated)S 269 x(LAT)S 13403 X
(VMS)S 269 x(I/O)S 269 x(User's)S 269 x(Reference)S 269 x(Manual:)S
269 x(Part)S 269 x(I,)S 498 y 5333 X(Port)S 13941 X(8-52)S 269 x(to)S
269 x(8-53)S 797 y 4796 X(Programming)S 268 x(A)S 269 x(LAT)S 269 x
(Applications)S 538 x(VMS)S 269 x(I/O)S 269 x(User's)S 269 x
(Reference)S 269 x(Manual:)S 269 x(Part)S 269 x(I,)S 498 y 5333 X
(Program)S 13941 X(8-49)S 269 x(to)S 269 x(8-53)S 797 y 4796 X
(Setting)S 268 x(Up)S 269 x(Virtual)S 269 x(Terminals)S 13403 X
(Guide)S 269 x(To)S 269 x(Setting)S 269 x(Up)S 269 x(A)S 269 x(VMS)S
269 x(System,)S 269 x(6-19)S 269 x(to)S 498 y 5333 X(For)S 269 x
(LAT)S 269 x(Terminals)S 13941 X(6-20;)S 269 x(VMS)S 269 x(System)S
269 x(Generation)S 269 x(Utility)S 499 y 13941 X(Manual,)S 269 x
(A-33)S 269 x(to)S 269 x(A-37)S 23641 Y 4796 X(\\)S 49 x(\\)S 50 x
(VMS)S 269 x(LAT)S 498 y 4796 X(\\)S 49 x(\\)S 50 x(NSU/SERVER)S
269 x(SOFTWARE)S 269 x(LAT)S 269 x(VMS)S 29901 Y 11732 X F152(T)S
-44 x(erminal)S 166 x(Server)S 167 x(and)S 167 x(LA)S -37 x(T)S 166 x
(Documentation)S 500 x(B\2035)S
PP
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4796 9229 XY F20(Index)S 398 y 4796 X 17928 24 R
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/F22 700.0 /Helvetica@DOCPSE DPSF
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4796 11377 XY F22(A)S 299 y -465 x 7776 24 R
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/F155 450.0 /NewCenturySchlbk-Roman@DOCPSE DPSF
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4796 12224 XY F155(ACCPO)S -2 x(RNAM,)S 349 x(7\2032)S 13298 Y 4796 X
F22(C)S 299 y -504 x 7776 24 R 548 y 4796 X F155(Chart,)S 159 x
(Revision,)S 159 x(Latsym,)S 159 x(Ltdriver,)S 548 y 5991 X(A\2031)S
548 y 4796 X(Cheat)S 149 x(Sheets,)S
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% DefineFont:F157 Category:10 PointSize:9
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8050 15241 XY F157(8\2031)S 300 x F155(to)S 299 x(8\2035)S 548 y
4796 X(Coffee,)S 349 x(1\2035)S 548 y 4796 X(Composite)S 149 x
(Link,)S 349 x(2\2036)S 548 y 4796 X(Connect,)S 149 x(QIO,)S 348 x
(7)S
(\2031)S 548 y 4796 X(Credits,)S 149 x(\212ow)S 149 x(control,)S
350 x(1\2038,)S 149 x(1\2039)S 548 y 4796 X(CXA16,)S 347 x(2\2035)S
548 y 4796 X(CXB16,)S 347 x(2\2035)S 548 y 4796 X(CXY)S -2 x(08,)S
349 x(2\2035)S 20129 Y 4796 X F22(D)S 299 y -504 x 7776 24 R 548 y
4796 X F155(Dataset)S 150 x(Hangup,)S 349 x(5\2033,)S 150 x(5\2034)S
548 y 4796 X(DEBE)S -2 x(T)S 150 x(Documentation,)S 349 x(B\2033)S
548 y 4796 X(DEC423,)S 348 x(2\2034)S 548 y 4796 X(DECconnect)S 149 x
(Documentation,)S 349 x(B\2033)S 548 y 4796 X(DECm)S -2 x(ux2,)S
348 x(2\2036,)S 150 x(2\2037)S 548 y 4796 X(DECm)S -2 x(ux2)S 150 x
(Indicator)S 151 x(LED')S -17 x(s,)S 348 x(2\2037)S 548 y 4796 X
(DECNET,)S 347 x(1\2032,)S 150 x(1\2033,)S 150 x(3\2031)S 548 y
4796 X(DECSA)S 148 x(Attribut)S 2 x(es,)S 348 x(2\2031)S 548 y 4796 X
(DECSA)S 148 x(Documentation,)S 349 x(B\2031)S 548 y 4796 X(DECSA)S
148 x(ETS)S 150 x(Indicato)S 2 x(r)S 149 x(LED')S -17 x(s,)S 348 x
(2)S
(\2032)S 547 y 4796 X(DECs)S -2 x(erver)S 150 x(100)S 150 x
(Attribute)S 2 x(s,)S 347 x(2\2033)S 548 y 4796 X(DECs)S -2 x(erver)S
168 x(100)S 168 x(Documentation,)S 548 y 5991 X(B\2032)S 11420 Y
14957 X(DECserver)S 149 x(100)S 150 x(Indicat)S 2 x(or)S 149 x(LED,)S
348 x(2\2033)S 548 y 14957 X(DECserver)S 149 x(200)S 150 x
(Attributes,)S 349 x(2\2034)S 548 y 14957 X(DECserver)S 167 x(200)S
168 x(Documentation,)S 548 y 16153 X(B\2032)S 548 y 14957 X
(DECserver)S 165 x(200)S 166 x(Indicat)S 2 x(or)S 165 x(LED')S -17 x
(s,)S 548 y 16153 X(2\2034)S 548 y 14957 X(DECserver)S 149 x(500)S
150 x(Attributes,)S 349 x(2\2035)S 548 y 14957 X(DECserver)S 167 x
(500)S 168 x(Documentation,)S 548 y 16153 X(B\2032)S 548 y 14957 X
(DECserver)S 165 x(500)S 166 x(Indicat)S 2 x(or)S 165 x(LED')S -17 x
(s,)S 548 y 16153 X(2\2036)S 548 y 14957 X(DECserver)S 135 x(550)S
137 x(Attribute)S 2 x(s/Differences,)S 548 y 16153 X(2\2035)S 548 y
14957 X(DECserver)S 161 x(Problem)S 161 x(Cheat)S 162 x(Sheet,)S
548 y 16153 X(8\2035)S 548 y 14957 X(DEV)S -50 x(ALLOC,)S 347 x
(5\20310)S 548 y 14957 X(Documentation,)S 350 x F157(B\2031)S 299 x
F155(to)S 299 x(B\2035)S 548 y 14957 X(Documentation,)S 150 x(LA)S
-25 x(T)S -41 x(,)S 149 x(VMS)S 150 x(V5,)S 348 x(B\2034)S 547 y
14957 X(Down)S 149 x(Line)S 150 x(Loading,)S 349 x F157(3\2031)S
300 x F155(to)S 299 x(3\2035)S 548 y 14957 X(Down)S 163 x(Line)S
164 x(Loading)S 164 x(Cheat)S 163 x(sheet,)S 548 y 16153 X(8\2031)S
548 y 14957 X(DS5CFG,)S 349 x(3\2034)S 548 y 14957 X(DYNRA)S -25 x
(T)S 149 x(program,)S 349 x(7\2032,)S 150 x(7\2033)S 24528 Y 14957 X
F22(E)S 299 y -465 x 7776 24 R 548 y 14957 X F155(EEPROM,)S 149 x
(DEC100,)S 348 x(2\2033)S 548 y 14957 X(EEPROM,)S 149 x(DEC500,)S
348 x(2\2032)S 547 y 14957 X(Ethernet)S 151 x(Device)S 149 x(T)S
-23 x(ypes,)S 348 x(1\2031)S 548 y 14957 X(Ethernet)S 151 x(Packet,)S
349 x(1\2037)S 548 y 14957 X(Ethernet)S 151 x(Protocol)S 150 x(T)S
-23 x(ypes,)S 348 x(1\2032)S
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20921 29901 XY F152(Index\2031)S
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%%DOC$Page: INDEX-2 68
1000 BP 39600 30600 PM 0 0 XY
4148 Y 4796 X F155(ETS)S 149 x(Attribute)S 2 x(s,)S 347 x(2\2031)S
5200 Y 4796 X F22(F)S 299 y -426 x 7776 24 R 548 y 4796 X F155(Flow)S
149 x(Control,)S 349 x(1\2038)S 7100 Y 4796 X F22(H)S 299 y -504 x
7776 24 R 548 y 4796 X F155(H3004,)S 349 x(2\2034)S 548 y 4796 X
(hot)S 149 x(swap,)S 349 x(2\2032)S 547 y 4796 X(Hot)S 150 x(Swap,)S
349 x(2\2035)S 10095 Y 4796 X F22(I)S 299 y -194 x 7776 24 R 548 y
4796 X F155(INCONST)S -24 x(A)S -25 x(TE,)S 348 x(A\2031)S 548 y
4796 X(Indicator)S 151 x(LED')S -17 x(s,)S 149 x(DECmu)S -2 x(x2,)S
349 x(2\2037)S 548 y 4796 X(Indicator)S 151 x(LED')S -17 x(s,)S 149 x
(DECSA)S 149 x(ETS,)S 348 x(2\2032)S 548 y 4796 X(Indicator)S 165 x
(LED')S -17 x(s,)S 166 x(DECserver)S 162 x(200,)S 548 y 5991 X
(2\2034)S 548 y 4796 X(Indicator)S 165 x(LED')S -17 x(s,)S 166 x
(DECserver)S 162 x(500,)S 547 y 5991 X(2\2036)S 548 y 4796 X
(Indicator)S 163 x(LED')S -17 x(s,)S 164 x(MUXserver)S 162 x(100,)S
548 y 5991 X(2\2037)S 548 y 4796 X(Indicator)S 151 x(LED,)S 148 x
(DECserver)S 149 x(100,)S 349 x(2\2033)S 548 y 4796 X(Init/queue,)S
349 x(4\2034)S 548 y 4796 X(Innerds,)S 149 x(LA)S -25 x(T,)S 348 x
(1)S
(\2039)S 548 y 4796 X(INVSTRL)S -41 x(VL,)S 348 x(5\20310)S 548 y
4796 X(IOSB,)S 348 x(7\2031)S 19118 Y 4796 X F22(K)S 298 y -465 x
7776 24 R 548 y 4796 X F155(Kindling,)S 348 x(vi)S 21017 Y 4796 X
F22(L)S 299 y -388 x 7776 24 R 548 y 4796 X F155(LAN)S 163 x(Bridge)S
164 x(100)S 165 x(Documentation,)S 548 y 5991 X(B\2033)S 548 y 4796 X
(LA)S -25 x(T$SYMP)S -33 x(ARAMETER)S -2 x(,)S 349 x(5\2038)S 548 y
4796 X(LA)S -25 x(T)S 149 x(Protocol,)S 350 x(1\2036)S 548 y 4796 X
(LA)S -25 x(T)S 149 x(Slot,)S 350 x(1\2038)S 547 y 4796 X(Latsym,)S
168 x(Ltdriver)S 167 x(revision)S 165 x(chart,)S 548 y 5991 X F157
(A)S
(\2031)S 300 x F155(to)S 299 x(A\2036)S 548 y 4796 X(LA)S -25 x(T)S
149 x(Theory,)S 348 x F157(1\2031)S 300 x F155(to)S 299 x(1\2039)S
548 y 4796 X(LDI,)S 348 x(2\2032)S 548 y 4796 X(Load)S 150 x
(Balancing,)S 348 x(1\2035)S 548 y 4796 X(L)S -25 x(TLOAD.CO)S -2 x
(M,)S 349 x(1\2033,)S 150 x(1\2034,)S 150 x(4\2033)S 548 y 4796 X(L)S
-25 x(TM)S 150 x(Documentation,)S 349 x(B\2033)S 4603 Y 14957 X F22
(M)S 299 y -581 x 7776 24 R 548 y 14957 X F155(MAP_PORT)S 149 x
(qio,)S 349 x(7\2032)S 547 y 14957 X(Message)S 150 x(T)S -24 x
(ypes,)S 149 x(Slot,)S 350 x(1\2039)S 548 y 14957 X(MOM$LOAD,)S 349 x
(3)S
(\2032,)S 149 x(3\2033,)S 150 x(3\2034)S 548 y 14957 X(Multica)S
2 x(st,)S 348 x(1\2034)S 548 y 14957 X(MUXserver)S 150 x(100)S 150 x
(Attributes,)S 349 x(2\2036)S 548 y 14957 X(MUXserver)S 166 x(100)S
167 x(Documentation,)S 548 y 16153 X(B\2032)S 548 y 14957 X
(MUXserver)S 164 x(100)S 164 x(Indica)S 2 x(tor)S 164 x(LED')S -17 x
(s,)S 548 y 16153 X(2\2037)S 10886 Y 14957 X F22(N)S 298 y -504 x
7776 24 R 548 y 14957 X F155(NVRAM,)S 348 x(3\2032,)S 150 x(3\2033,)S
150 x(5\2034)S 12785 Y 14957 X F22(P)S 299 y -465 x 7776 24 R 548 y
14957 X F155(Packet,)S 150 x(Ethernet,)S 349 x(1\2037)S 548 y 14957 X
(Partit)S 2 x(ion)S 149 x(in)S 150 x(TSM,)S 349 x(6\2031)S 548 y
14957 X(Pluto,)S 349 x(3\2033)S 548 y 14957 X(Protocol)S 151 x(T)S
-23 x(ypes,)S 348 x(1\2032)S 548 y 14957 X(PS080)S 2 x(1ENG.SYS,)S
348 x(2\2033)S 547 y 14957 X(PSM-F-)S 2 x(BADLOG)S -2 x(IC,)S 349 x
(5)S
(\20310)S 17446 Y 14957 X F22(Q)S 299 y -543 x 7776 24 R 548 y 14957 X
F155(QIO')S -16 x(s,)S 149 x(using)S 149 x(IOSB,)S 348 x(7\2031)S
548 y 14957 X(QIO')S -16 x(s)S 149 x(to)S 150 x(LA)S -25 x(T)S 150 x
(ports,)S 349 x F157(7\2031)S 299 x F155(to)S 300 x(7\2033)S 548 y
14957 X(QIO,)S 150 x(MAP_PORT,)S 347 x(7\2032)S 548 y 14957 X(QIO,)S
150 x(RA)S -26 x(TING,)S 349 x(7\2032)S 548 y 14957 X(Queue,)S 149 x
(Initi)S 2 x(alize,)S 348 x(4\2034)S 21537 Y 14957 X F22(R)S 299 y
-504 x 7776 24 R 548 y 14957 X F155(Rating,)S 150 x(LA)S -25 x(T)S
149 x(algorythm,)S 349 x(1\2034)S 548 y 14957 X(Rating)S 150 x
(announcement,)S 349 x(1\2034)S 548 y 14957 X(RA)S -25 x(TING)S 150 x
(QIO,)S 349 x(7\2032)S 548 y 14957 X(Ratings,)S 149 x(service,)S
149 x(in)S 150 x(VMS)S 150 x(V5,)S 348 x(7\2033)S 548 y 14957 X
(RBMS)S 150 x(Documentation,)S 349 x(B\2033)S 548 y 14957 X(RCF)S
149 x(vs.)S 223 x(TSM,)S 349 x(6\2031)S 548 y 14957 X(Remote)S 160 x
(Print)S 159 x(Queue)S 160 x(Cheat)S 159 x(Sheet,)S 547 y 16153 X
(8\2033)S 548 y 14957 X(Remote)S 155 x(Print)S 155 x(Queues,)S 154 x
(Theory,)S 355 x F157(4\2031)S 548 y 16153 X F155(to)S 299 x(4\2035)S
29901 Y 4796 X F152(Index\2032)S
PP
EP
%%DOC$Page: INDEX-3 69
1000 BP 39600 30600 PM 0 0 XY
4148 Y 4796 X F155(Remote)S 151 x(Print)S 153 x(Queues,)S 152 x(T)S
-28 x(roubleshoot-)S 548 y 5991 X(ing,)S 348 x F157(5\2031)S 300 x
F155(to)S 299 x(5\20310)S 548 y 5393 X(Copying)S 150 x(to)S 149 x
(device,)S 349 x(5\2032,)S 150 x(5\2034)S 548 y 5393 X(Dataset)S
151 x(Hangup,)S 348 x(5\2033)S 548 y 5393 X(Despool)S 150 x(Device,)S
349 x(5\2032)S 548 y 5393 X(Device)S 150 x(Control)S 150 x
(Libraries,)S 349 x(5\2037)S 548 y 5393 X(Duplicate)S 151 x(Server)S
150 x(Names,)S 348 x(5\2036)S 548 y 5393 X(Exceeded)S 150 x(Quota,)S
349 x(5\2038)S 548 y 5393 X(LA)S -25 x(T$SYMP)S -32 x(ARAMETE)S -2 x
(R)S 159 x(usage,)S 547 y 6589 X(5\2038)S 548 y 5393 X(PRTSMB)S 150 x
(usage,)S 348 x(5\2038)S 548 y 5393 X(R)S -17 x(W)S -41 x(AST,)S
348 x(5\2039)S 548 y 5393 X(SDA)S 150 x(usage,)S 348 x(5\2039)S 548 y
5393 X(TEST)S 150 x(PORT,)S 348 x(5\2035)S 548 y 5393 X(VMS)S 150 x
(queue)S 150 x(problems,)S 349 x(5\2037)S 548 y 4796 X
(Retain=Error,)S 348 x(4\2034)S 548 y 4796 X(Revision)S 159 x
(Chart,)S 163 x(Ltdriver)S -32 x(,)S 162 x(Latsym,)S 548 y 5991 X
(A\2031)S 14537 Y 4796 X F22(S)S 299 y -465 x 7776 24 R 548 y 4796 X
F155(SDA,)S 348 x(5\2039)S 548 y 4796 X(Server)S 150 x(Attributes,)S
349 x F157(2\2031)S 300 x F155(to)S 299 x(2\2037)S 548 y 4796 X
(Service,)S 149 x(local,)S 350 x(4\2033)S 548 y 4796 X(Services,)S
149 x(cluster,)S 349 x(1\2034)S 548 y 4796 X(Services,)S 149 x
(default)S 2 x(,)S 348 x(1\2034)S 548 y 4796 X(Slot,)S 150 x(LA)S
-25 x(T,)S 348 x(1\2038)S 548 y 4796 X(Slot)S 150 x(Message,)S 149 x
(types,)S 348 x(1\2039)S 548 y 4796 X(Spooled)S 151 x(Devices,)S
348 x(5\2032)S 20272 Y 4796 X F22(T)S 299 y -426 x 7776 24 R 548 y
4796 X F155(Theory)S -50 x(,)S 149 x(LA)S -25 x(T)S 149 x(protoc)S
2 x(ol,)S 348 x(1\2036)S 548 y 4796 X(TOOMNYLIB,)S 348 x(5\20310)S
548 y 4796 X(TSC,)S 348 x(3\2034)S 548 y 4796 X(TSC,)S 149 x(ETS,)S
348 x(2\2032)S 548 y 4796 X(TSM,)S 349 x F157(6\2031)S 299 x F155
(to)S 300 x(6\2033)S 548 y 5393 X(Common)S 149 x(Problems,)S 348 x
(6)S
(\2033)S 548 y 5393 X(DSVCONFIG)S 150 x(and)S 548 y 6290 X(DS5CFG)S
149 x(and)S 548 y 7187 X(TSVCFG)S 149 x(and,)S 348 x(6\2031)S 548 y
5393 X(parti)S 2 x(tion,)S 349 x(6\2031)S 548 y 5393 X(T)S -41 x
(est)S 150 x(Commands,)S 347 x(6\2032)S 548 y 4796 X(TSM)S 150 x
(Documentation,)S 349 x(B\2032)S 4148 Y 14957 X(TSM)S 172 x(vs.)S
265 x(NCP-Remote)S 171 x(Console)S 548 y 16153 X(Facility,)S 349 x
(6)S
(\2031)S 548 y 14957 X(TSVCFG,)S 348 x(3\2034)S 6296 Y 14957 X F22
(U)S 299 y -504 x 7776 24 R 548 y 14957 X F155(UCB)S 150 x(\(Unit)S
150 x(Control)S 150 x(Block\),)S 349 x(1\2032)S 8196 Y 14957 X F22
(V)S 299 y -465 x 7776 24 R 547 y 14957 X F155(V)S -20 x(irtual)S
151 x(Circuit,)S 349 x F157(1\2036)S 548 y 14957 X F155(VMS)S 150 x
(V5)S 150 x(LA)S -25 x(T)S 149 x(Documentation,)S 349 x(B\2034)S
548 y 14957 X(VMS)S 150 x(V)S -41 x(ersion)S 149 x(5,)S 149 x(new)S
150 x(features,)S 349 x(7\2032)S 11191 Y 14957 X F22(X)S 299 y -465 x
7776 24 R 548 y 14957 X F155(XON/XOFF)S 149 x(Flow)S 149 x(control,)S
350 x(1\2038)S 13090 Y 14957 X F22(Y)S 299 y -465 x 7776 24 R 548 y
14957 X F155(^Y)S 149 x(AST,)S 349 x(7\2031)S 29901 Y 20921 X F152
(Index)S
(\2033)S
PP
EP
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%%Pages 69
|
| Moved by moderator at writer's request.
<<< KERNEL::DISK$APDAT7:[NOTES$LIBRARY]CSGUK_SYSTEMS.NOTE;1 >>>
-< CSGUK_SYSTEMS >-
================================================================================
Note 69.0 POSTSCRIPT FILE IDIOTS GUIDE TO BRIDGES!! No replies
KERNEL::MORIARTY 4892 lines 22-AUG-1989 13:26
--------------------------------------------------------------------------------
THE FOLLOWING IS AN IDIOTS GUIDE TO BRIDGES WHICH MAY BE OF USE
TO ANYONE WHO WANTS TO KNOW WHAT THEY DO ETC.THE ENTRY IS IN POSTSCRIPT
FORMAT SO PLEASE EXTRACT IT & GET IT PRINTED ON A POSTSCRIPT PRINTER.
KEVIN MORIARTY..
=====================================================================
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cleartomark
%
/DOCPSE DECMCS 256 array copy def
mark % CREATE DOCPSE ENCODING
8#055 /hyphen
8#201 /bullet 8#202 /emdash 8#203 /endash 8#204 /dagger
8#205 /daggerdbl 8#206 /registered 8#207 /trademark %8#210 /Delta
8#211 /fi 8#212 /fl
counttomark -1 bitshift % DIVIDE BY 2
{DOCPSE 3 1 roll put} repeat % STACK NOW CONTAINS MARK
cleartomark
%
/reencodedict 10 dict def %Local storage for "ReENCODE"
/ReENCODE { % /basefont /newfont encoding ReENCODE
/newencoding exch def %ARG: NAME OF ENCODING VECTOR
/newfontname exch def %ARG: NEW NAME FOR FONT AFTER RE-ENCODING
findfont
/basefontdict exch def %ARG: NAME OF FONT TO BE RE-ENCODED
basefontdict maxlength dict begin %CREATE AND OPEN NEW DICT
basefontdict { %COPY ENTRIES FROM BASE FONT DICT TO NEW ONE
1 index /FID ne {
def %IF NOT THE ONE WE'RE ENCODING, JUST COPY PTRS
} { %else
pop pop %IGNORE FID AND ENCODING FOR ONE WE'RE ENCODING
} ifelse
} forall
/FontName newfontname def %DEFINE NEW NAME
/Encoding newencoding def %DEFINE NEW ENCODING VECTOR
newfontname currentdict definefont %TURN IT INTO A PS FONT
pop %IGNORE MODIFIED DICT RETURNED BY DEFINEFONT
end
} bind def
%
/cvsstr 64 string def
/tempmatrix matrix def
%
/BP { % BEGIN PAGE
/Magnification exch def /DVC$PSPage save def
} def
%
/EP {DVC$PSPage restore} def % END PAGE
%
/XP { % EXIT PAGE (TEMPORARILY) TO ADD FONTS/CHARS
% SAVE CURRENT POINT INFORMATION SO IT CAN BE RESET LATER
/Xpos where {pop Xpos} {0} ifelse
/Ypos where {pop Ypos} {0} ifelse
/currentpoint cvx stopped {0 0 moveto currentpoint} if
/DVC$PSPage where {pop DVC$PSPage restore} if
moveto
/Ypos exch def /Xpos exch def
} def
%
/RP {/DVC$PSPage save def} def % RESUME PAGE
%
/PF {GlobalMode LocalMode} def % PURGE FONTS TO RECLAIM MEMORY
%
/GlobalMode { % SWITCH TO BASE SAVE/RESTORE LEVEL, SAVING STATE
PortraitMode PaperWidth PaperHeight PxlResolution Resolution
Magnification Ymax Xorigin Yorigin RasterScaleFactor
% SAVE CURRENTPOINT INFORMATION TO RESET LATER
/currentpoint cvx stopped {0 0 moveto currentpoint} if
/DVC$PSPage where {pop DVC$PSPage restore} if
DVC$PSFonts restore RecoverState
} def
%
/RecoverState { % PRESERVE STATE AT BASE LEVEL
12 copy
/Ypos exch def /Xpos exch def /RasterScaleFactor exch def
/Yorigin exch def /Xorigin exch def /Ymax exch def
/Magnification exch def /Resolution exch def /PxlResolution exch def
/PaperHeight exch def /PaperWidth exch def /PortraitMode exch def
DoInitialScaling
PortraitMode not {PaperWidth 0 SetupLandscape} if
Xpos Ypos moveto
} def
%
/InitializeState { % INITIALIZE STATE VARIABLES TO DEFAULT VALUES
/Resolution 3600 def /PxlResolution 300 def
/RasterScaleFactor PxlResolution Resolution div def
/PortraitMode true def /PaperHeight 11 Resolution mul def
/PaperWidth 8.5 Resolution mul def /Ymax PaperHeight def
/Magnification 1000 def /Xorigin 0 def /Yorigin 0 def
/Xpos 0 def /Ypos 0 def /InitialMatrix matrix currentmatrix def
} def
%
/LocalMode { % SWITCH FROM BASE SAVE/RESTORE LEVEL, RESTORING STATE
/Ypos exch def /Xpos exch def /RasterScaleFactor exch def
/Yorigin exch def /Xorigin exch def /Ymax exch def
/Magnification exch def /Resolution exch def /PxlResolution exch def
/PaperHeight exch def /PaperWidth exch def /PortraitMode exch def
DoInitialScaling
PortraitMode not {PaperWidth 0 SetupLandscape} if
Xpos Ypos moveto
/DVC$PSFonts save def /DVC$PSPage save def
} def
% % ABBREVIATIONS
/S /show load def
/SV /save load def
/RST /restore load def
/Yadjust {Ymax exch sub} def
%
/SXY { % (x,y) POSITION ABSOLUTE, JUST SET Xpos & Ypos, DON'T MOVE
Yadjust /Ypos exch def /Xpos exch def
} def
%
/XY { % (x,y) POSITION ABSOLUTE
Yadjust 2 copy /Ypos exch def /Xpos exch def moveto
} def
%
/X { % (x,0) POSITION ABSOLUTE
currentpoint exch pop 2 copy /Ypos exch def /Xpos exch def moveto
} def
%
/Y { % (0,y) POSITION ABSOLUTE
currentpoint pop exch Yadjust 2 copy
/Ypos exch def /Xpos exch def moveto
} def
%
/xy { % (x,y) POSITION RELATIVE
neg rmoveto currentpoint /Ypos exch def /Xpos exch def
} def
%
/x { % (x,0) POSITION RELATIVE
0 rmoveto currentpoint /Ypos exch def /Xpos exch def
} def
%
/y { % (0,y) POSITION RELATIVE
0 exch neg rmoveto currentpoint /Ypos exch def /Xpos exch def
} def
%
/R { % DRAW A RULE
/ht exch def /wd exch def gsave 0 setgray
currentpoint newpath moveto
0 ht rlineto wd 0 rlineto
0 ht neg rlineto wd neg 0 rlineto
closepath fill grestore wd 0 rmoveto
currentpoint /Ypos exch def /Xpos exch def
} def
%
/RES { % <PXL-file resolution(pix/inch)> <resolution(pix/inch)> RES
/Resolution exch def /PxlResolution exch def
/RasterScaleFactor PxlResolution Resolution div def
DoInitialScaling
} def
%
/DoInitialScaling { % DO INITIAL SCALING
InitialMatrix setmatrix 72 Resolution div dup scale
} def
%
/PM { % <paper-height(pix)> <paper-width(pix)> PM
XP
/PaperWidth exch def /PaperHeight exch def
/Ymax PaperHeight def /PortraitMode true def
DoInitialScaling
RP
} def
%
/SetupLandscape {translate 90 rotate} def
/LM { % <paper-height(pix)> <paper-width(pix)> LM
XP
/PaperWidth exch def /PaperHeight exch def
/Ymax PaperWidth def /PortraitMode false def
DoInitialScaling PaperWidth 0 SetupLandscape
RP
} def
%
/MAG { % CHANGE MAGNIFICATION SETTING
XP /Magnification exch def RP
} def
%
/SPB { % <xoffset><yoffset>SPB - BEGIN "\SPECIAL" MODE
Yadjust /Yorigin exch def /Xorigin exch def
GlobalMode Xorigin Yorigin translate
Resolution 72 div dup scale % RESTORE DEFAULT SCALING
Magnification 1000 div dup scale % ADJUST FOR ANY MAGNIFICATION
/Xpos Xpos 72 Resolution div mul 1000 Magnification div mul def
/Ypos Ypos 72 Resolution div mul 1000 Magnification div mul def
/spsavobj save def %SAVE STATE & STACK DEPTH FOR CLEANUP AFTER FIGURE
/showpage {} def %DISABLE DURING FIGURE; `RESTORE' WILL BLOW DEF AWAY
mark
} def
%
/SPE { % SPE - END "\SPECIAL" MODE
spsavobj restore
cleartomark
1000 Magnification div dup scale % UN-ADJUST FOR ANY MAGNIFICATION
72 Resolution div dup scale % RESTORE DEFAULT INTERNAL SCALING
LocalMode
} def
%
/PP {showpage} def
/CLRP {erasepage} def
%
/DMF { % /font-name <point-size(pix)> DMF
/psz exch def /nam exch def nam findfont psz scalefont setfont
} def
%
/concatnam { % /abcd (xxx) concatnam ==> /abcdxxx
/xxx exch def /nam exch def
/namstr nam cvsstr cvs def
/newnam namstr length xxx length add string def
newnam 0 namstr putinterval
newnam namstr length xxx putinterval
newnam cvn
} def
%
/strip { % /abcdef 2 strip ==> /cdef
/num exch def /nam exch def
/namstr nam cvsstr cvs def
/newlen namstr length num sub def
namstr num newlen getinterval cvn
} def
% ROUTINES TO HANDLE PACKING/UNPACKING NUMBERS
/PackHW { % <target> <pos> <num> PackHW --> <new target>
/num exch def /pos exch def /target exch def
num 16#0000FFFF and 1 pos sub 16 mul bitshift target or
} def
/PackByte { % <target> <pos> <num> PackByte --> <new target>
/num exch def /pos exch def /target exch def
num 16#000000FF and 3 pos sub 8 mul bitshift target or
} def
/UnpkHW { % <pos> <num> UnpkHW --> <unpacked value>
/num exch def /pos exch def
num 1 pos sub -16 mul bitshift 16#0000FFFF and
dup 16#00007FFF gt {16#00010000 sub} if
} def
/UnpkByte { % <pos> <num> UnpkByte --> <unpacked value>
/num exch def /pos exch def
num 3 pos sub -8 mul bitshift 16#000000FF and
dup 16#0000007F gt {16#00000100 sub} if
} def
%
/DPSF { % /procname size /fontname DPSF
findfont exch scalefont
[ exch /setfont cvx ] cvx def
} bind def
%
/PXLBuildCharDict 17 dict def
/CMEncodingArray 128 array def
0 1 127 {CMEncodingArray exch dup cvsstr cvs cvn put} for
/RasterConvert {RasterScaleFactor div} def
/TransformBBox {
aload pop
/BB-ury exch def /BB-urx exch def /BB-lly exch def /BB-llx exch def
[ BB-llx RasterConvert BB-lly RasterConvert
BB-urx RasterConvert BB-ury RasterConvert ]
} def
/RunLengthToRasters {
% none yet
} def
/GenerateRasters { % GENERATE RASTERS FOR "IMAGEMASK"
rasters runlength 1 eq {RunLengthToRasters} if
} def
%
/int-dict-name {int (-dict) concatnam} def
/int-dict {int (-dict) concatnam cvx load} def
%
/DefinePXLFont {
% <int-font-name><ext-font-name><pt-sz(pix)><PXL mag><num-chars>...
% ...[llx lly urx ury]<newfont-fg>DefinePXLFont
/newfont exch def /bb exch def /num exch def /psz exch def
/dsz exch def /pxlmag exch def /ext exch def /int exch def
/fnam ext (-) concatnam pxlmag cvsstr cvs concatnam def
newfont not {
int-dict-name 13 dict def
int-dict begin
/FontType 3 def /FontMatrix [ 1 dsz div 0 0 1 dsz div 0 0 ] def
/FontBBox bb TransformBBox def /Encoding CMEncodingArray def
/CharDict 1 dict def CharDict begin /Char-Info num array def end
/BuildChar {
PXLBuildCharDict begin
/char exch def /fontdict exch def
fontdict /CharDict get /Char-Info get char get aload pop
/rasters exch def /PackedWord1 exch def
0 PackedWord1 UnpkHW 16#7FFF ne {
/PackedWord2 exch def /wx 0 PackedWord1 UnpkHW def
/rows 2 PackedWord1 UnpkByte def /cols 3 PackedWord1 UnpkByte def
/llx 0 PackedWord2 UnpkByte def /lly 1 PackedWord2 UnpkByte def
/urx 2 PackedWord2 UnpkByte def /ury 3 PackedWord2 UnpkByte def
}{ %else
/PackedWord2 exch def /PackedWord3 exch def /PackedWord4 exch def
/wx 1 PackedWord1 UnpkHW def /rows 0 PackedWord2 UnpkHW def
/cols 1 PackedWord2 UnpkHW def /llx 0 PackedWord3 UnpkHW def
/lly 1 PackedWord3 UnpkHW def /urx 0 PackedWord4 UnpkHW def
/ury 1 PackedWord4 UnpkHW def
} ifelse
rows 0 lt {
/rows rows neg def /runlength 1 def
}{ %else
/runlength 0 def
} ifelse
wx 0
llx RasterConvert lly RasterConvert
urx RasterConvert ury RasterConvert setcachedevice
rows 0 ne {
gsave
cols rows true RasterScaleFactor
0 0 RasterScaleFactor neg llx .5 add neg ury .5 add
tempmatrix astore GenerateRasters imagemask
grestore
} if
end
} def
end
fnam int-dict definefont pop
} if
int-dict-name fnam findfont psz scalefont def
currentdict int [ int-dict /setfont cvx ] cvx put
} def
/PXLF { true DefinePXLFont} def % SIGNAL THAT FONT IS ALREADY LOADED
/PXLNF {false DefinePXLFont} def % SIGNAL THAT FONT IS NOT ALREADY LOADED
%
/PXLC { % <int-font-name><code><wx><llx><lly><urx><ury>...
% ...<rows><cols><runlength><rasters>PXLC
/rasters exch def /runlength exch def /cols exch def /rows exch def
/ury exch def /urx exch def /lly exch def /llx exch def
/wx exch def /code exch def /int exch def
% SEE IF LONG OR SHORT FORMAT IS REQUIRED
true cols CKSZ rows CKSZ ury CKSZ urx CKSZ lly CKSZ llx CKSZ
TackRunLengthToRows {
int-dict /CharDict get /Char-Info get code
[ 0 0 llx PackByte 1 lly PackByte 2 urx PackByte 3 ury PackByte
0 0 wx PackHW 2 rows PackByte 3 cols PackByte rasters ] put
}{ %else
int-dict /CharDict get /Char-Info get code
[ 0 0 urx PackHW 1 ury PackHW 0 0 llx PackHW 1 lly PackHW
0 0 rows PackHW 1 cols PackHW 0 0 16#7FFF PackHW 1 wx PackHW rasters ] put
} ifelse
} def
%
/CKSZ {abs 127 le and} def
/TackRunLengthToRows {runlength 0 ne {/rows rows neg def} if} def
%
/PLOTC {
% <wx><dsz><psz><llx><lly><urx><ury><rows><cols><runlength><rasters>PLOTC
/rasters exch def /runlength exch def /cols exch def /rows exch def
/ury exch def /urx exch def /lly exch def /llx exch def
/psz exch def /dsz exch def /wx exch def
% "PLOT" A CHARACTER'S RASTER PATTERN
rows 0 ne {
gsave
currentpoint translate psz dsz div dup scale
cols rows true RasterScaleFactor 0 0 RasterScaleFactor
neg llx .5 add neg ury .5 add tempmatrix astore
GenerateRasters imagemask
grestore
} if
wx x
} def
%
end %$DVCDict
%%EndProlog
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BeginDVC$PSDoc
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%%EndSetup
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5991 X(message.)S 331 x(After)S 202 x(a)S 203 x(set)S 202 x(period)S
202 x(of)S 203 x(time)S 202 x(the)S 203 x(sending)S 203 x(node,)S
212 x(tired)S 203 x(of)S 202 x(waiting)S 597 y 5991 X(for)S 196 x
(the)S 196 x(acknowledgement,)S 204 x(would)S 196 x(retransmit)S
195 x(his)S 196 x(message,)S 203 x(and)S 196 x(continue)S 598 y
5991 X(retransmitting)S 166 x(until)S 167 x(acknowledged.)S 11142 Y
5991 X(So)S 198 x(ALOHANET)S 197 x(brough)S 2 x(t)S 198 x(us)S 198 x
(the)S 199 x(concept)S 198 x(of)S 199 x(MUL)S -27 x(TIPLE)S 198 x
(ACCES)S -2 x(S)S 198 x(trans-)S 598 y 5991 X(missions,)S 208 x
(where)S 200 x(all)S 200 x(nodes)S 200 x(could)S 200 x(talk)S 200 x
(over)S 200 x(the)S 201 x(same)S 199 x(medium)S 200 x(\(the)S 200 x
(same)S 598 y 5991 X(radio)S 161 x(frequency\))S 162 x
(simultaneously)S -55 x(,)S 162 x(and)S 161 x(would)S 161 x
(retransmit)S 160 x(in)S 161 x(the)S 161 x(event)S 162 x(of)S 160 x
(a)S 598 y 5991 X("collision")S 198 x(between)S 199 x(two)S 197 x
(sending)S 200 x(nodes.)S 319 x(The)S 200 x(problem)S 198 x(with)S
198 x(ALOHANET)S 597 y 5991 X(was)S 189 x(that)S 190 x(nodes)S 190 x
(didn')S -9 x(t)S 190 x(listen)S 189 x(before)S 191 x(transmitting,)S
196 x(to)S 190 x(see)S 190 x(if)S 189 x(someone)S 191 x(else)S 598 y
5991 X(was)S 124 x(already)S 126 x(talking,)S 134 x(before)S 125 x
(talking)S 126 x(themselves.)S 208 x(So,)S 134 x("collisions")S 124 x
(happened)S 598 y 5991 X(fairly)S 181 x(frequently)S -54 x(,)S 185 x
(necessitating)S 181 x(frequent)S 181 x(re-transmissions,)S 184 x
(and)S 181 x(dropping)S 598 y 5991 X(the)S 166 x(ef\211ciency)S 168 x
(of)S 166 x(the)S 166 x(communications)S 166 x(\(throug)S 2 x
(hput\).)S 17120 Y 5991 X(Early)S 214 x(ETHERNET)S 212 x(was)S 213 x
(designed)S 214 x(by)S 214 x(XEROX)S 212 x(corporation)S 214 x(at)S
214 x(their)S 213 x(now-)S 598 y 5991 X(famous)S 146 x(P)S -36 x
(ARC)S 146 x(\(Palo)S 146 x(Alto)S 146 x(Research)S 147 x(Center\).)S
216 x(Instead)S 146 x(of)S 146 x(using)S 148 x(radio)S 147 x(waves)S
598 y 5991 X(\(which)S 183 x(are)S 183 x(susceptible)S 182 x(to)S
182 x(interference)S 184 x(from)S 182 x(large)S 183 x(birds\),)S
187 x(they)S 183 x(connec)S 2 x(ted)S 597 y 5991 X(all)S 199 x(the)S
200 x(nodes)S 199 x(to)S 199 x(shielded)S 200 x(coaxial)S 200 x
(cable,)S 208 x(with)S 199 x(a)S 199 x(Bird-proof)S 199 x(coating)S
200 x(on)S 200 x(it.)S 598 y 5991 X(And)S 132 x(in)S 132 x(order)S
133 x(to)S 132 x(decrease)S 132 x(the)S 132 x(frequency)S 134 x(of)S
132 x(collisions,)S 139 x(they)S 132 x(made)S 132 x(each)S 133 x
(node)S 598 y 5991 X("Listen")S 214 x(to)S 215 x(the)S 214 x(cable)S
215 x(prior)S 215 x(to)S 214 x(transmitting.)S 368 x(If)S 214 x(the)S
214 x(node)S 215 x(heard)S 216 x(another)S 598 y 5991 X(node)S 188 x
(already)S 189 x("talking")S 188 x(on)S 188 x(the)S 188 x(cable,)S
194 x(it)S 187 x(would)S 188 x("back)S 188 x(off")S 187 x(for)S 188 x
(a)S 188 x(set)S 187 x(period)S 597 y 5991 X(of)S 198 x(time,)S 207 x
(and)S 198 x(retry)S 199 x(later)S -37 x(.)S 318 x(This)S 199 x
(increased)S 198 x(the)S 199 x(utilization)S 198 x(of)S 198 x(the)S
198 x(available)S 598 y 5991 X(bandwidth,)S 133 x(which)S 124 x(at)S
124 x(that)S 123 x(time)S 124 x(was)S 123 x(about)S 124 x(3)S 124 x
(Million)S 124 x(bits)S 124 x(per)S 124 x(second)S 124 x(\(3Mb\).)S
23397 Y 4796 X F24(1.2)S 348 x(Look)S 232 x(what)S 232 x(they've)S
232 x(done)S 232 x(with)S 233 x(my)S 232 x(song,)S 232 x(ma)S 896 y
5991 X F151(Ethernet)S 234 x(\(V2,)S 250 x(as)S 232 x(we)S 233 x
(know)S 234 x(and)S 233 x(love)S 234 x(it)S 233 x(today\))S 234 x
(was)S 232 x(jointly)S 234 x(designed)S 234 x(by)S 598 y 5991 X
(Xerox,)S 195 x(Digital,)S 193 x(and)S 188 x(Intel)S 188 x
(corporation.)S 289 x(As)S 187 x(mentioned)S 188 x(in)S 189 x(the)S
188 x(preface,)S 194 x(the)S 598 y 5991 X(Ethernet)S 263 x
(Speci\211cation)S 264 x(is)S 263 x(FULL)S -46 x(Y)S 263 x
(described)S 263 x(in)S 263 x(the)S 264 x("Blue)S 263 x(Book",)S
287 x(DEC)S 597 y 5991 X(Standard)S 166 x(134.)S 29901 Y 4796 X F152
(1)S
(\2032)S 498 x(Ethernet)S 167 x(for)S 166 x(Idiots)S
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4796 4032 XY F28(1.2.1)S 300 x(Ethernet)S 200 x(V2)S 5825 Y 5991 X
F151(The)S 163 x(Ethernet)S 162 x(Speci\211cation)S 163 x(is)S 162 x
(a)S 162 x(description)S 162 x(of)S 162 x(the)S 162 x(two)S 162 x
("Lowest")S 161 x(layers)S 162 x(of)S 598 y 5991 X(both)S 184 x(the)S
184 x(Digital)S 184 x(Networking)S 184 x(Architecture)S 185 x
(\(DNA\))S 183 x(and)S 184 x(the)S 184 x(ISO)S 183 x(\(Interna-)S
597 y 5991 X(tional)S 181 x(Standards)S 180 x(Organization\))S 180 x
(Networking)S 182 x(Standard.)S 265 x(These)S 181 x(two)S 180 x
("Lay-)S 598 y 5991 X(ers")S 224 x(are)S 226 x(the)S 225 x("Data)S
223 x(Link)S 226 x(layer")S 225 x(and)S 225 x(the)S 225 x("Physical)S
226 x(layer".)S 398 x(What)S 225 x(do)S 225 x(we)S 598 y 5991 X
(mean)S 166 x(by)S 167 x(this?)S 10009 Y 5991 X(W)S -28 x(ell,)S
188 x(in)S 183 x(any)S 183 x(Networking)S 184 x(Architecture)S 183 x
(you)S 184 x(have)S 184 x(different)S 182 x("Layers".)S 273 x(The)S
598 y 5991 X(higher)S 221 x(Layers)S 220 x(get)S 220 x(more)S 219 x
("software)S 219 x(related",)S 233 x(and)S 219 x(the)S 220 x(lower)S
219 x(layers)S 220 x(more)S 598 y 5991 X("Hardware)S 177 x
(related".)S 255 x(So)S 177 x(the)S 178 x("Physical",)S 180 x(or)S
178 x(lowest)S 176 x(layer)S -36 x(,)S 180 x(would)S 178 x(deal)S
177 x(with)S 597 y 5991 X(the)S 143 x(electrical)S 143 x
(characteristics)S 143 x(of)S 143 x(the)S 143 x(transmission)S 142 x
(medium-)S 143 x(the)S 143 x(coaxial)S 143 x(ca-)S 598 y 5991 X
(ble,)S 123 x(the)S 112 x(voltage)S 113 x(levels)S 112 x(on)S 112 x
(that)S 112 x(cable,)S 123 x(connec)S 2 x(tors,)S 122 x(bit)S 112 x
(rate,)S 123 x(data)S 112 x(modulation,)S 598 y 5991 X(etc.)S 897 y
-802 x(The)S 194 x("Data)S 193 x(Link",)S 201 x(or)S 194 x(next)S
194 x(lowest)S 192 x(layer)S -36 x(,)S 201 x(deals)S 193 x(with)S
193 x(the)S 194 x("Framing")S 194 x(of)S 193 x(the)S 597 y 5991 X
(data)S 224 x(sent)S 225 x(over)S 225 x(the)S 225 x(physical)S 225 x
(channel.)S 399 x(The)S 225 x("Data)S 224 x(Link")S 225 x(layer)S
225 x(arrang)S 2 x(es)S 598 y 5991 X(the)S 140 x(data)S 140 x(in)S
141 x(a)S 140 x(speci\211c)S 141 x(order)S -37 x(,)S 146 x(such)S
141 x(as)S 140 x(Destination)S 139 x(address,)S 146 x(Source)S 140 x
(address,)S 598 y 5991 X(Protocol)S 201 x(type,)S 209 x(and)S 200 x
(Frame)S 200 x(Check)S 201 x(Sequence)S 201 x(\(CRC\))S 199 x(prior)S
200 x(to)S 200 x(passing)S 200 x(it)S 199 x(to)S 598 y 5991 X(the)S
189 x(physical)S 190 x(link.)S 292 x(It)S 189 x(is)S 188 x(the)S
190 x("Data)S 188 x(Link")S 190 x(layer)S 190 x(that)S 189 x(puts)S
188 x(our)S 190 x(data)S 189 x(into)S 189 x(a)S 597 y 5991 X
("Packet",)S 167 x(which)S 166 x(is)S 166 x(the)S 166 x(basic)S 166 x
(unit)S 166 x(of)S 166 x(data)S 166 x(sent)S 166 x(between)S 165 x
(Ethernet)S 167 x(nodes.)S 18129 Y 4796 X F36(T)S -37 x(able)S 150 x
(1)S
(\2031:)S 498 x(DNA/ISO)S 149 x(Architectural)S 150 x(Layers)S 224 y
4796 X 17928 24 R 598 y 4796 X F157(DNA)S 14111 X(ISO)S 299 y 4796 X
17928 24 R 647 y 4796 X F155(User)S 14111 X(Application)S 897 y
4796 X(Network)S 150 x(Mangement)S 14111 X(Application)S 896 y 4796 X
(Network)S 150 x(Applicatio)S 2 x(n)S 14111 X(Presentation)S 897 y
4796 X(Session)S 149 x(Control)S 14111 X(Session)S 897 y 4796 X(End)S
149 x(to)S 150 x(End)S 149 x(Communication)S 14111 X(T)S -28 x
(ransport)S 896 y 4796 X(Routing)S 14111 X(Network)S 897 y 4796 X
(Data)S 150 x(Link)S 14111 X(Data)S 150 x(Link)S 897 y 4796 X
(Physical)S 149 x(Link)S 14111 X(Physical)S 149 x(Link)S 398 y 4796 X
17928 24 R 29901 Y 17158 X F152(Ethernet)S 167 x(for)S 167 x(Idiots)S
498 x(1\2033)S
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3969 Y 5991 X F151(The)S 241 x("higher)S 241 x(level")S 241 x
(layers)S 240 x(deal)S 240 x(with)S 240 x(such)S 240 x(things)S 241 x
(as)S 240 x(DECNE)S -2 x(T)S 241 x(routing,)S 598 y 5991 X(Network)S
224 x(management,)S 239 x(user)S 224 x(interface,)S 239 x(sessi)S
-2 x(on)S 224 x(control,)S 239 x(etc.)S 395 x(ISO)S 223 x(has)S 223 x
(7)S 598 y 5991 X("Layers",)S 222 x(and)S 210 x(DNA)S 210 x(has)S
210 x(8)S 210 x("Layers",)S 222 x(which)S 210 x(rough)S 2 x(ly)S
210 x(parallel)S 210 x(each)S 211 x(other)S -36 x(.)S 598 y 5991 X
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(these)S 246 x(layers,)S 265 x(check)S 247 x(out)S 245 x(the)S 246 x
(little)S 245 x(blue)S 245 x(book,)S 597 y 5991 X("Digital')S -19 x
(s)S 199 x(Networks:)S 288 x(An)S 200 x(Architecture)S 200 x(W)S
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167 x(about)S 166 x(the)S 166 x(Data)S 165 x(Link)S 167 x(and)S 167 x
(Physical)S 166 x(Layers.)S 8154 Y 4796 X F36(1.2.1.1)S 250 x
(CSMA-CD)S 9947 Y 5991 X F151(Ethernet)S 132 x(is)S 132 x(called)S
131 x(a)S 132 x("CSMA-CD)S -2 x(")S 132 x(medium.)S 210 x(This)S
132 x(stands)S 132 x(for)S 132 x("Carrier)S 131 x(Sense)S 598 y
5991 X(Multiple)S 166 x(Access)S 166 x(with)S 165 x(Collision)S 166 x
(Detect".)S 896 y 5991 X(\201)S 595 x(Carrier)S 213 x(sense)S 213 x
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(the)S 214 x(Ethernet)S 213 x(must)S 213 x(listen)S 213 x(for)S 598 y
6888 X("Carrier")S 225 x(prior)S 227 x(to)S 226 x(transmitting.)S
402 x(If)S 226 x(carrier)S 226 x(is)S 226 x(detected,)S 241 x(that)S
226 x(means)S 598 y 6888 X(that)S 144 x(another)S 145 x(node)S 145 x
(is)S 144 x(transmitting,)S 150 x(and)S 144 x(the)S 145 x(listening)S
145 x(node)S 145 x(must)S 144 x(defer)S 598 y 6888 X(his)S 166 x
(transmissi)S -2 x(on.)S 896 y 5991 X(\201)S 595 x(Multiple)S 172 x
(Access)S 171 x(-)S 172 x(All)S 172 x(nodes)S 172 x(are)S 172 x
(equal)S 173 x(on)S 172 x(the)S 173 x(Ethernet.)S 240 x(There)S 173 x
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123 x(they)S 123 x(have)S 123 x(data)S 598 y 6888 X(to)S 166 x
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167 x(node)S 166 x(curren)S 2 x(tly)S 166 x(transmitting.)S 896 y
5991 X(\201)S 595 x(Collision)S 292 x(Detect)S 292 x(-)S 292 x(All)S
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270 x(collision?)S 532 x(W)S -28 x(ell,)S 297 x(let')S -20 x(s)S
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189 x(both)S 189 x(begin)S 189 x(to)S 188 x(transmit)S 188 x(onto)S
188 x(the)S 189 x(Ethernet)S 188 x(cable.)S 289 x(BOOM!)S 597 y
5991 X(Packet)S 240 x(A)S 239 x(meets)S 239 x(Packet)S 239 x(B!)S
240 x(CRASH!)S 238 x(Now)S 239 x(instead)S 239 x(of)S 240 x(good)S
239 x(data)S 239 x(on)S 240 x(the)S 598 y 5991 X(cable,)S 182 x(we)S
178 x(have)S 179 x(a)S 178 x("Collision",)S 181 x(which)S 178 x
(gives)S 179 x(us)S 178 x(garbage)S 180 x(data.)S 258 x(All)S 178 x
(nodes)S 178 x(on)S 598 y 5991 X(the)S 173 x(Ethernet)S 173 x
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(nodes\))S 173 x(must)S 173 x(be)S 173 x(capable)S 172 x(of)S 598 y
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194 x(before)S 194 x(attempting)S 194 x(retransmission.)S 305 x
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3969 Y 5991 X F151(of)S 134 x(the)S 134 x(backoff)S 135 x(is)S 134 x
(important.)S 211 x(If)S 133 x(both)S 135 x(nodes)S 134 x(backed)S
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5991 X(of)S 147 x(time,)S 151 x(and)S 147 x(then)S 148 x
(transmitted)S 146 x(again,)S 152 x(we)S 147 x(would)S 147 x(have)S
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896 y 5991 X(In)S 252 x(DEC)S -2 x(NET)S 252 x(counters,)S 274 x
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(initially)S 135 x(deferred")S 135 x(which)S 135 x(means)S 597 y
5991 X(that)S 189 x(when)S 190 x(the)S 189 x(V)S -56 x(AX)S 189 x
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221 x(Not)S 166 x(a)S 166 x(problem.)S 13235 Y 4796 X F28(1.2.2)S
300 x(The)S 200 x(Physical)S 201 x(Channel)S 15028 Y 5991 X F151
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(Newer)S 164 x(Thinwire,)S 598 y 5991 X(and)S 166 x(even)S 167 x("T)S
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166 x(take)S 166 x(a)S 166 x(look:)S 17419 Y 5991 X(T)S -31 x
(raditional)S 234 x(Thickwire)S 235 x(Ethernet)S 234 x(cable)S 234 x
(\(sometimes)S 233 x(called)S 234 x(a)S 234 x("backbone"\))S 598 y
5991 X(is)S 243 x(that)S 244 x(Orange)S 244 x(or)S 244 x(Y)S -55 x
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243 x(big)S 244 x(around)S 245 x(as)S 243 x(your)S 597 y 5991 X
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235 x(looks)S 235 x(like,)S 253 x('cause)S 598 y 5991 X(my)S 227 x
(drawing)S 227 x(abilities)S 225 x(are)S 227 x(limited.)S 403 x(The)S
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(thick)S 230 x("dielectric")S 229 x(insulation,)S 246 x(which)S 230 x
(is)S 229 x(surrounded)S 230 x(by)S 230 x(a)S 229 x(braided)S 230 x
(wire)S 597 y 5991 X("shielding",)S 146 x(which)S 142 x(is)S 140 x
(all)S 140 x(covered)S 142 x(by)S 141 x(the)S 141 x(pretty)S 141 x
(Y)S -56 x(ellow)S 141 x(or)S 141 x(Orange)S 141 x(covering)S 2 x(,)S
598 y 5991 X(either)S 156 x(T)S -45 x(e\212on)S 157 x(or)S 156 x
(PVC.)S 156 x(The)S 157 x(whole)S 156 x(thing,)S 159 x(if)S 156 x
(we)S 156 x(cut)S 156 x(it)S 156 x(crosswis)S -2 x(e,)S 159 x(would)S
156 x(look)S 598 y 5991 X(like)S 137 x(a)S 136 x(copper)S 136 x
(center)S 137 x(\(a)S 136 x(little)S 136 x(smaller)S 135 x(than)S
137 x(1/10"\))S 136 x(surrounded)S 138 x(in)S 136 x(concentric)S
598 y 5991 X(rings)S 200 x(by)S 199 x(Dielectric)S 199 x(insulator)S
-37 x(,)S 208 x(braided)S 199 x(shielding,)S 209 x(then)S 200 x
("Jacket".)S 321 x(Got)S 198 x(the)S 598 y 5991 X(picture?)S 25190 Y
5991 X(Now)S -46 x(,)S 309 x(at)S 280 x(each)S 280 x(end)S 281 x(of)S
280 x(our)S 281 x(cable)S 280 x(we)S 279 x(must)S 280 x(have)S 281 x
(a)S 280 x("T)S -46 x(erminator".)S 565 x(The)S 598 y 5991 X(T)S
-46 x(erminator)S 167 x(is)S 166 x(an)S 167 x(endcap)S 166 x(which)S
167 x(puts)S 166 x(50)S 166 x(Ohms)S 166 x(of)S 166 x(resistance)S
166 x(between)S 166 x(the)S 597 y 5991 X(center)S 153 x(conductor)S
153 x(\(Signal\))S 153 x(and)S 152 x(the)S 153 x(shielding)S 152 x
(\(Ground\).)S 218 x(Clamped)S 151 x(onto)S 153 x(one)S 598 y 5991 X
(\(NOT)S 200 x(BOTH\))S 200 x(ot)S 201 x(the)S 201 x(teminators)S
200 x(should)S 201 x(be)S 201 x(a)S 201 x(ground)S 202 x(clamp,)S
210 x(which)S 201 x(goes)S 598 y 5991 X(to)S 231 x(a)S 231 x
(dedicated)S 230 x(Earth)S 231 x(Ground.)S 417 x(Ungroun)S 2 x(ded)S
230 x(backbones)S 232 x(make)S 231 x(for)S 231 x(\212aky)S 29901 Y
17158 X F152(Ethernet)S 167 x(for)S 167 x(Idiots)S 498 x(1\2035)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(problems)S 227 x(and)S 227 x(fried)S 227 x
(equipment.)S 405 x(So,)S 242 x(we)S 227 x(have)S 228 x(a)S 227 x
(cable,)S 243 x(a)S 227 x(terminator)S 227 x(on)S 598 y 5991 X(each)S
167 x(end-)S 166 x(Where)S 166 x(do)S 166 x(the)S 167 x(V)S -56 x
(AXes)S 165 x(plug)S 167 x(in?)S 5763 Y 4796 X F36(1.2.2.0.1)S 250 x
(The)S 167 x(T)S -27 x(ranceiver)S 7556 Y 5991 X F151(All)S 278 x
(nodes)S 278 x(connec)S 2 x(ting)S 279 x(to)S 278 x(the)S 278 x
(Ethernet)S 279 x(must)S 278 x(plug)S 279 x(into)S 279 x(a)S 278 x
("T)S -31 x(ranceiver")S 598 y 5991 X(such)S 287 x(as)S 287 x(our)S
287 x(H4000,)S 317 x(which)S 287 x(is)S 286 x(the)S 287 x(black)S
288 x(box)S 287 x(which)S 287 x(clamps)S 286 x(onto)S 287 x(the)S
597 y 5991 X(Ethernet)S 203 x(cable,)S 214 x(and)S 203 x(which)S
204 x(converts)S 203 x(the)S 204 x(data)S 203 x(sent)S 203 x(by)S
203 x(the)S 204 x(V)S -56 x(AX)S 203 x(into)S 203 x(the)S 598 y
5991 X(appropriate)S 170 x(\(Manchester)S 171 x(Encoded\))S 170 x
(voltage)S 171 x(levels)S 170 x(on)S 170 x(the)S 170 x(Ethernet)S
171 x(cable.)S 598 y 5991 X(The)S 283 x(T)S -31 x(rancieve)S 2 x(r)S
282 x(is)S 282 x(a)S 282 x("V)S -46 x(ampire".)S 570 x(T)S -46 x(o)S
283 x(attach)S 282 x(it)S 282 x(to)S 282 x(the)S 282 x(Main)S 283 x
(cable,)S 312 x(or)S 598 y 5991 X("Backbone",)S 158 x(a)S 155 x
(hole)S 156 x(is)S 154 x(drilled)S 155 x(\(using)S 156 x(a)S 155 x
(special)S 155 x(tool\))S 154 x(in)S 156 x(the)S 155 x(Cable,)S 157 x
(exposing)S 597 y 5991 X(the)S 149 x(center)S 149 x(conductor)S 150 x
(and)S 149 x(clearing)S 149 x(away)S 149 x(the)S 149 x(shielding)S
149 x(from)S 148 x(the)S 149 x(hole.)S 217 x(The)S 598 y 5991 X(T)S
-31 x(ranceiv)S 2 x(er)S 152 x(then)S 154 x(has)S 152 x(a)S 153 x
(center)S 153 x("T)S -31 x(ap")S 153 x(which)S 153 x(makes)S 153 x
(contact)S 152 x(with)S 153 x(the)S 153 x(center)S 598 y 5991 X
(conductor)S -36 x(,)S 203 x(and)S 196 x(two)S 195 x("side)S 195 x
(pins")S 195 x(which)S 195 x(peirce)S 196 x(the)S 196 x(jacket,)S
204 x(making)S 196 x(contact)S 598 y 5991 X(with)S 166 x(the)S 166 x
(shielding.)S 896 y 5991 X(That')S -18 x(s)S 144 x(how)S 145 x(the)S
145 x(tranceiver)S 146 x(hooks)S 145 x(into)S 145 x(the)S 145 x
(Backbone.)S 216 x(Y)S -56 x(ou)S 145 x(can)S 146 x(imagine)S 145 x
(the)S 598 y 5991 X(problems)S 166 x(encountered)S 167 x(by)S 167 x
(poor)S 166 x(or)S 166 x(incorrect)S 167 x(tranceiver)S 167 x
(installation:)S 897 y 5991 X(\201)S 595 x(Drilled)S 165 x(through)S
168 x(the)S 166 x(center)S 167 x(conductor)S -8 x(-)S 166 x(an)S
166 x("Open")S 166 x(cable.)S 896 y 5991 X(\201)S 595 x(A)S 157 x
(piece)S 159 x(of)S 158 x(the)S 158 x(shielding)S 158 x(contacting)S
160 x(the)S 158 x(center)S 158 x(conduc)S 2 x(tor)S -9 x(-)S 158 x
(a)S 158 x("Shorted")S 598 y 6888 X(cable.)S 897 y 5991 X(\201)S
595 x(A)S 165 x(poorly)S 167 x(drilled)S 166 x(hole,)S 167 x(or)S
166 x(bent)S 166 x(T)S -30 x(ap-)S 166 x(Flaky)S -55 x(,)S 167 x
(noisy)S 166 x(transmissions.)S 896 y 5991 X(In)S 149 x(short,)S
153 x(whenever)S 150 x(a)S 149 x(tranceiver)S 150 x(is)S 148 x
(added)S 149 x(to)S 149 x(a)S 149 x(backbone,)S 153 x(there')S -18 x
(s)S 149 x(potential)S 598 y 5991 X(for)S 218 x(problems.)S 377 x
(Once)S 217 x(correctly)S 219 x(installed,)S 231 x(however)S -36 x
(,)S 231 x(they)S 218 x(clamp)S 218 x(on)S 218 x(pretty)S 598 y
5991 X(tight,)S 167 x(and)S 166 x(are)S 166 x(quite)S 167 x(stable)S
165 x(\(unless)S 166 x(you)S 167 x(kick)S 167 x(them)S 166 x
(around\).)S 21603 Y 5991 X(A)S 124 x(special)S 124 x(type)S 125 x
(of)S 124 x(oscilloscope,)S 133 x(called)S 124 x(a)S 124 x(T)S -12 x
(ime)S 124 x(Domain)S 124 x(Re\212ectometer)S 125 x(\(TDR\),)S 598 y
5991 X(can)S 189 x(take)S 188 x(a)S 188 x("picture")S 188 x(of)S
188 x(the)S 188 x(backbone,)S 195 x(and)S 189 x(a)S 188 x
("Re\212ection")S 188 x(will)S 187 x(appear)S 188 x(for)S 598 y
5991 X(each)S 194 x(T)S -30 x(ap,)S 201 x(barrel)S 194 x(connector)S
-36 x(,)S 202 x(or)S 194 x(even)S 195 x(a)S 193 x(bend)S 194 x(in)S
195 x(the)S 194 x(cable.)S 305 x(By)S 194 x(examining)S 598 y 5991 X
(these)S 217 x(re\212ections,)S 230 x(a)S 217 x(cable')S -19 x(s)S
216 x(length)S 218 x(and)S 217 x("goodness")S 217 x(can)S 217 x(be)S
217 x(veri\211ed.)S 375 x(The)S 597 y 5991 X(TDR)S 166 x(is)S 165 x
(invaluable)S 167 x(in)S 166 x(\211nding)S 168 x(backbone)S 167 x
(problems.)S 25788 Y 5991 X(The)S 192 x(tranceiver)S 29 x(')S -19 x
(s)S 191 x(job,)S 199 x(as)S 191 x(mentioned,)S 199 x(is)S 191 x(to)S
191 x(listen)S 191 x(for)S 192 x(carrier)S 192 x(on)S 192 x(the)S
191 x(Back-)S 597 y 5991 X(bone,)S 130 x(Convert)S 120 x(data)S 119 x
(from)S 119 x(the)S 120 x(V)S -56 x(AX)S 119 x(into)S 119 x
(Manchester)S 120 x(Encoded)S 120 x(V)S -46 x(oltage)S 119 x(levels)S
598 y 5991 X(on)S 179 x(the)S 178 x(backbone,)S 183 x(and)S 178 x
(DETECT)S 178 x(COLLISIO)S -2 x(NS.)S 179 x(\(I)S 178 x(told)S 177 x
(ya)S 179 x(we'd)S 178 x(get)S 178 x(to)S 178 x(it\).)S 598 y 5991 X
(When)S 137 x(two)S 136 x(nodes)S 137 x(on)S 137 x(the)S 137 x
(backbone)S 137 x(talk)S 137 x(at)S 136 x(the)S 137 x(same)S 136 x
(time,)S 143 x(the)S 136 x(voltage)S 138 x(level)S 29901 Y 4796 X
F152(1\2036)S 498 x(Ethernet)S 167 x(for)S 166 x(Idiots)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(on)S 157 x(the)S 156 x(backbone)S 158 x(is)S 156 x
(driven)S 157 x(MORE)S 155 x(NEGA)S -28 x(TIVE)S 155 x(than)S 157 x
(usual,)S 159 x(and)S 157 x(the)S 157 x(T)S -31 x(ran-)S 598 y 5991 X
(ceiver)S 204 x(signals)S 203 x(the)S 204 x(Node)S 203 x(that)S 203 x
(a)S 203 x(collision)S 203 x(has)S 204 x(occurred.)S 334 x(The)S
204 x(Node)S 203 x(\(V)S -56 x(AX,)S 598 y 5991 X(DECserver)S -37 x
(,)S 203 x(SUN)S 195 x(workstation,)S 203 x(whatever\))S 196 x(must)S
195 x(then)S 196 x(back)S 196 x(off)S 196 x(and)S 195 x(retry)S -54 x
(,)S 598 y 5991 X(as)S 202 x(described)S 202 x(earlier)S -37 x(.)S
330 x(For)S 203 x(more)S 202 x(info)S 202 x(on)S 203 x(different)S
202 x(T)S -31 x(ranceiver)S 2 x(s,)S 211 x(check)S 203 x(out)S 597 y
5991 X(the)S 166 x(802.3)S 167 x(section,)S 166 x(at)S 166 x(the)S
166 x(end.)S 8154 Y 5991 X(One)S 166 x(last)S 165 x(tranceiver)S
168 x("attribute")S 165 x(which)S 166 x(I'll)S 166 x(touch)S 166 x
(on-)S 167 x(the)S 166 x("Heartbeat".)S 896 y 5991 X(After)S 294 x
(an)S 294 x(Ethernet)S 295 x(node)S 294 x(transmits)S 293 x(a)S 294 x
(packet)S 295 x(onto)S 294 x(the)S 294 x(backbone,)S 328 x(the)S
598 y 5991 X(tranceiver)S 163 x(can)S 162 x(raise)S 162 x(a)S 162 x
("Carrier)S 161 x(Detect)S 161 x(Check")S 163 x(signal)S 162 x(to)S
161 x(the)S 162 x(transmitting)S 598 y 5991 X(node.)S 208 x(This)S
122 x(signal)S 123 x(is)S 122 x(used)S 122 x(as)S 122 x(a)S 122 x
(sort)S 122 x(of)S 122 x("Keepalive",)S 131 x(telling)S 123 x(the)S
122 x(transmitting)S 598 y 5991 X(node)S 167 x(that)S 167 x(all)S
166 x(is)S 166 x(well.)S 224 x(This)S 166 x(signal)S 167 x(is)S 167 x
(frequently)S 167 x(called)S 167 x("Heartbeat".)S 223 x(802.3)S 597 y
5991 X(tranceivers)S 162 x(raise)S 162 x(this)S 161 x(signal)S 162 x
(within)S 161 x(a)S 162 x(different)S 162 x("T)S -13 x(ime)S 162 x
(W)S -19 x(indow")S 161 x(following)S 598 y 5991 X(the)S 207 x(end)S
207 x(of)S 207 x(the)S 207 x(packet)S 208 x(transmiss)S -2 x(ion)S
208 x(than)S 207 x(Ethernet)S 207 x(V2)S 207 x(tranceivers,)S 218 x
(and)S 598 y 5991 X(the)S 184 x(two)S 182 x(are)S 184 x(not)S 183 x
(compatible.)S 274 x(Most)S 183 x(nodes,)S 188 x(however)S -36 x(,)S
188 x(can)S 184 x(run)S 184 x(without)S 183 x(any)S 598 y 5991 X
("Heartbeat",)S 180 x(so)S 177 x(most)S 176 x(tranceiver)S 2 x(s)S
177 x(\(such)S 177 x(as)S 177 x(the)S 178 x(H4005\))S 177 x(permit)S
177 x(Heartbeat)S 597 y 5991 X(to)S 166 x(be)S 166 x(turned)S 167 x
(off.)S 221 x(More)S 167 x(on)S 166 x(this)S 166 x(in)S 166 x(the)S
167 x(802.3)S 166 x(section.)S 15028 Y 4796 X F28(1.2.3)S 300 x(W)S
-33 x(ARNING-)S 207 x(TECHN)S -2 x(ICAL)S 208 x(JARGON)S 207 x
(FOLLOWS!)S 209 x(DAN)S -2 x(GER,)S 697 y 6424 X(WILL)S 200 x
(ROBINSON)S -2 x(!)S 17519 Y 5991 X F151(Now)S 177 x(let')S -19 x(s)S
177 x(get)S 178 x(REAL)S 177 x(technical.)S 256 x(The)S 178 x
(Ethernet,)S 181 x(as)S 177 x(described)S 178 x(fully)S 178 x(in)S
177 x(DEC)S 597 y 5991 X(STD)S 255 x(134)S 255 x(and)S 255 x(the)S
255 x(DECconnect)S 255 x(guide,)S 279 x(has)S 255 x(certain)S 255 x
(maximum)S 255 x(distance)S 598 y 5991 X(limitations.)S 446 x(These)S
241 x(limitations)S 240 x(are)S 241 x(imposed)S 240 x(due)S 242 x
(to)S 240 x(signal)S 242 x(propogation)S 598 y 5991 X(delay)S 166 x
(and)S 167 x(signal)S 166 x(deterioration.)S 222 x(Consider:)S 21105 Y
5991 X(An)S 219 x(electonic)S 220 x(signal)S 219 x(travels)S 219 x
(down)S 219 x(a)S 219 x(wire)S 219 x(very)S 220 x(fast,)S 232 x(but)S
219 x(there)S 219 x(is)S 219 x(SOME)S 598 y 5991 X(delay)S -55 x(.)S
218 x(Let')S -19 x(s)S 154 x(say)S 154 x(we've)S 154 x(got)S 154 x
(a)S 154 x(large)S 155 x(LAN,)S 154 x(three)S 154 x(500)S 154 x
(Meter)S 155 x(segments)S 153 x(joined)S 598 y 5991 X(by)S 209 x
(repeaters,)S 218 x(maybe)S 209 x(Fiber)S 208 x(Optic)S 207 x
(repeaters.)S 348 x(Node)S 208 x(A,)S 208 x(at)S 208 x(one)S 208 x
(F)S -36 x(AR)S 207 x(END)S 597 y 5991 X(of)S 213 x(the)S 214 x(LAN)S
213 x(wants)S 212 x(to)S 214 x(transmit,)S 225 x(so)S 213 x(he)S
213 x(listens,)S 225 x(doesn')S -9 x(t)S 213 x(hear)S 214 x(carrier)S
-37 x(,)S 226 x(and)S 598 y 5991 X(starts)S 215 x(talking.)S 374 x
(The)S 218 x(\211rst)S 216 x(BIT)S 216 x(of)S 216 x(Node)S 217 x(A)S
-37 x(')S -19 x(s)S 216 x(packet,)S 230 x(worst)S 216 x(case,)S 229 x
(with)S 216 x(the)S 598 y 5991 X(Largest)S 194 x(LEGAL)S 194 x(Lan,)S
202 x(can)S 195 x(take)S 194 x(23.19)S 194 x(microseconds)S 194 x
(to)S 194 x(reach)S 195 x(Node)S 194 x(B,)S 195 x(at)S 598 y 5991 X
(the)S 166 x(OTHER)S 165 x(F)S -36 x(AR)S 165 x(END)S 165 x(of)S
166 x(this)S 166 x(LAN)S 166 x(\(Y)S -46 x(up,)S 167 x(that')S -19 x
(s)S 165 x(right,)S 167 x(microseconds\).)S 26485 Y 5991 X(Now)S
150 x(Node)S 151 x(B,)S 150 x(at)S 150 x(the)S 151 x(other)S 151 x
(end)S 151 x(of)S 150 x(the)S 151 x(LAN,)S 150 x(decides)S 151 x(he)S
150 x(wants)S 150 x(to)S 150 x(transmit.)S 598 y 5991 X(He)S 205 x
(listens)S 204 x(for)S 205 x(carrier)S -36 x(,)S 214 x(but)S 205 x
(it')S -19 x(s)S 205 x(only)S 205 x(been,)S 216 x(say)S -56 x(,)S
215 x(23.18)S 205 x(microseconds)S 205 x(since)S 597 y 5991 X(the)S
144 x(Node)S 143 x(A)S 144 x(started)S 142 x(talking,)S 150 x(so)S
143 x(the)S 144 x(signal)S 144 x(hasn')S -9 x(t)S 143 x(QUITE)S 143 x
(reached)S 144 x(him)S 143 x(yet.)S 598 y 5991 X(So)S 225 x(He)S
225 x(starts)S 224 x(talking.)S 400 x(Of)S 224 x(course,)S 241 x
(.01)S 225 x(microseconds)S 225 x(later)S -37 x(,)S 240 x(the)S 226 x
(Node)S 225 x(A)S -38 x(')S -18 x(s)S 29901 Y 17158 X F152(Ethernet)S
167 x(for)S 167 x(Idiots)S 498 x(1\2037)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(message)S 211 x(reaches)S 211 x(the)S 211 x(Node)S
211 x(B,)S 211 x(and)S 211 x(the)S 211 x(Node)S 211 x(B)S 211 x
(realizes)S 210 x(that)S 210 x(a)S 211 x(collision)S 598 y 5991 X
(has)S 219 x(occurred.)S 380 x(Does)S 218 x(he)S 219 x(shut)S 219 x
(up?)S 379 x(Not)S 218 x(yet.)S 380 x(If)S 218 x(he)S 219 x(stopped)S
218 x(talking)S 220 x(right)S 598 y 5991 X(away)S -55 x(,)S 220 x
(the)S 210 x(Collision)S 209 x(might)S 210 x(not)S 209 x(last)S 209 x
(long)S 210 x(enough)S 211 x(for)S 210 x(Node)S 209 x(A)S 209 x
(\(as)S 209 x(well)S 209 x(as)S 598 y 5991 X(other)S 227 x(nodes)S
226 x(on)S 227 x(the)S 226 x(LAN\))S 226 x(to)S 226 x(realize)S 226 x
(that)S 227 x(a)S 226 x(Collision)S 225 x(has)S 227 x(occurred.)S
403 x(So)S 597 y 5991 X(the)S 179 x(second)S 180 x(node)S 180 x(KEE)S
-2 x(PS)S 180 x(T)S -27 x(ALKING)S -2 x(,)S 180 x(sending)S 180 x
(out)S 179 x(a)S 180 x(nonsense)S 179 x(bit)S 179 x(pattern)S 598 y
5991 X(\(this)S 187 x(is)S 187 x(called)S 187 x(the)S 188 x(JAM\))S
187 x(until)S 187 x(ALL)S 188 x(nodes)S 187 x(on)S 188 x(the)S 187 x
(LAN)S 188 x(have)S 188 x(had)S 188 x(time)S 186 x(to)S 598 y 5991 X
(realize)S 172 x(that)S 172 x(a)S 172 x(collision)S 172 x(has)S 172 x
(occurred,)S 175 x(and)S 172 x(any)S 173 x(data)S 172 x(they've)S
172 x(been)S 173 x(hearing)S 598 y 5991 X(has)S 166 x(probably)S
167 x(been)S 166 x(garbage)S 167 x(\(Jammin',)S 166 x(jammin'\).)S
896 y 5991 X(So,)S 186 x(according)S 182 x(to)S 181 x(the)S 182 x
(Ethernet)S 181 x(Speci\211cation,)S 186 x(based)S 181 x(on)S 182 x
(a)S 181 x(Maximum)S 182 x(sized)S 598 y 5991 X(LAN,)S 220 x(a)S
220 x(collision)S 220 x(can)S 220 x(occur)S 221 x(anytime)S 220 x
(within)S 220 x(the)S 220 x(\211rst)S 220 x(51.2)S 220 x
(microseconds)S 598 y 5991 X(after)S 187 x(transmission)S 187 x
(begins.)S 285 x(This)S 188 x(allows)S 186 x(for)S 187 x(a)S 188 x
(total)S 186 x(WORST)S -46 x(-CASE)S 185 x(round)S 598 y 5991 X
(trip)S 130 x(propogation)S 130 x(delay)S 131 x(of)S 129 x(46.38)S
131 x(microseconds,)S 137 x(plus)S 130 x(Jam)S 130 x(time.)S 209 x
(If)S 129 x(a)S 130 x(colision)S 597 y 5991 X(occurs)S 219 x(AFTER)S
218 x(this)S 219 x(51.2)S 219 x(microsecond)S 219 x(window)S -47 x
(,)S 232 x(then)S 219 x(an)S 219 x(error)S 220 x(is)S 218 x(logged.)S
598 y 5991 X(This)S 153 x(might)S 152 x(be)S 153 x(caused)S 152 x
(by)S 153 x(too)S 152 x(large)S 153 x(of)S 152 x(a)S 153 x(LAN,)S
153 x(a)S 152 x(segment)S 152 x(over)S 154 x(500)S 152 x(Meters,)S
598 y 5991 X(or)S 178 x(a)S 178 x(bad)S 177 x(tranceiver)S 179 x(or)S
178 x(node)S 179 x(on)S 178 x(the)S 178 x(LAN)S 178 x(not)S 178 x
(checking)S 179 x(for)S 178 x(Carrier)S 178 x(before)S 598 y 5991 X
(transmitting.)S 356 x(In)S 211 x(DECNE)S -2 x(T)S -45 x(,)S 211 x
(this)S 210 x(will)S 211 x(cause)S 210 x(a)S 211 x(T)S -30 x
(ransmit)S 210 x(failure,)S 223 x(usually)S 597 y 5991 X(a)S 190 x
("Remote)S 190 x(failure)S 190 x(to)S 190 x(Defer".)S 294 x(BAAAAD)S
188 x(NEWS!)S 190 x(So,)S 197 x(you)S 191 x(can)S 191 x(see)S 190 x
(why)S 191 x(we)S 598 y 5991 X(have)S 167 x(the)S 166 x(MAXIMUM)S
166 x(con\211gu)S 2 x(ration)S 166 x(guidelines)S 167 x(for)S 166 x
(the)S 166 x(Ethernet.)S 15626 Y 4796 X F28(1.2.4)S 300 x(Thinwire)S
200 x(and)S 200 x(his)S 200 x(T)S -44 x(wisted)S 201 x(Sister)S 896 y
4796 X F36(1.2.4.1)S 250 x(Thinwire)S 167 x(\(Cheapernet\))S 18316 Y
5991 X F151(In)S 205 x(addition)S 204 x(to)S 205 x(the)S 205 x
("Thickwire")S 205 x(backbone,)S 216 x(there)S 205 x(is)S 204 x(a)S
205 x(cable)S 205 x(called)S 205 x("Thin-)S 597 y 5991 X(wire".)S
224 x(When)S 168 x(it)S 166 x(\211rst)S 167 x(came)S 167 x(out)S
167 x(it)S 167 x(was)S 166 x(nicknamed)S 168 x("Cheapernet",)S 168 x
(since)S 167 x(the)S 598 y 5991 X(cost)S 213 x(of)S 213 x(the)S 213 x
(cable)S 213 x(and)S 214 x(tranceiver)S 214 x(was)S 212 x(much)S
214 x(lower)S 213 x(than)S 214 x(Thickwire.)S 364 x(Ba-)S 598 y
5991 X(sically)S -55 x(,)S 218 x(the)S 208 x(rules)S 208 x(and)S
207 x(workings)S 208 x(are)S 208 x(the)S 208 x(same)S 207 x(as)S
207 x(Thickwire,)S 219 x(with)S 207 x(a)S 208 x(few)S 598 y 5991 X
(notable)S 166 x(exceptions:)S 896 y 5991 X(\201)S 595 x(Maximum)S
166 x(segment)S 167 x(length)S 167 x(is)S 165 x(185)S 166 x(Meters)S
166 x(instead)S 166 x(of)S 166 x(500)S 166 x(Meters.)S 897 y 5991 X
(\201)S 595 x(The)S 146 x(Cable)S 146 x(is)S 145 x(thinner)S -8 x(-)S
146 x(it)S 145 x(is)S 146 x(NOT)S 145 x(drilled)S 146 x(&)S 146 x
(tapped)S 145 x(as)S 146 x(Thickwire)S 147 x(is.)S 214 x(In-)S 598 y
6888 X(stead,)S 155 x(the)S 153 x(cable)S 154 x(must)S 152 x(be)S
153 x(broken,)S 157 x(and)S 154 x(a)S 153 x("T")S 153 x(connector)S
154 x(installed)S 152 x(wher-)S 597 y 6888 X(ever)S 162 x(a)S 162 x
(node)S 162 x(connec)S 2 x(ts)S 161 x(to)S 162 x(the)S 162 x(cable.)S
220 x(The)S 163 x("T")S 161 x(connec)S 2 x(tor)S 161 x(either)S 163 x
(connects)S 598 y 6888 X(directly)S 232 x(to)S 231 x(a)S 232 x
(thinwire)S 232 x(port)S 232 x(on)S 232 x(the)S 232 x(Ethernet)S
232 x(interface)S 232 x(\(Usually)S 232 x(the)S 598 y 6888 X(case)S
143 x(w/P)S -64 x(.C.)S 143 x(interfaces,)S 148 x(and)S 144 x(the)S
143 x(DESQ)S -2 x(A\),)S 143 x(or)S 144 x(is)S 142 x(connec)S 2 x
(ted)S 142 x(to)S 143 x(a)S 143 x(DEST)S -28 x(A,)S 598 y 6888 X
(which)S 166 x(converts)S 167 x(the)S 166 x("T")S 166 x(to)S 166 x
(a)S 166 x(standard)S 166 x(15)S 166 x(pin)S 166 x(tranceiver)S 167 x
(cable.)S 896 y 5991 X(\201)S 595 x(Nodes)S 210 x(attached)S 210 x
(to)S 210 x(Thinwire)S 211 x(can)S 211 x(be)S 211 x(.5)S 210 x
(Meters)S 211 x(apart,)S 221 x(as)S 210 x(opposed)S 210 x(to)S 598 y
6888 X(2.5)S 166 x(Meters)S 166 x(for)S 166 x(Thickwire.)S 29901 Y
4796 X F152(1\2038)S 498 x(Ethernet)S 167 x(for)S 166 x(Idiots)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(For)S 167 x(more)S 166 x(info)S 166 x(on)S 166 x
(Thinwire,)S 168 x(see)S 165 x(the)S 167 x(DEC)S -2 x(conne)S 2 x
(ct)S 165 x(Con\211gu)S 2 x(ration)S 166 x(Guide.)S 5165 Y 4796 X
F36(1.2.4.2)S 250 x(T)S -37 x(wisted)S 167 x(Pair)S 166 x(Ethernet)S
897 y 5991 X F151(In)S 280 x(response)S 280 x(to)S 280 x(public)S
281 x(demand,)S 309 x(we've)S 280 x(come)S 280 x(out)S 280 x(with)S
280 x(a)S 280 x(T)S -35 x(wisted)S 279 x(Pair)S 597 y 5991 X
(Ethernet)S 181 x(adapter)S -37 x(.)S 268 x(This)S 181 x(allows)S
180 x(you)S 182 x(to)S 181 x(come)S 182 x(out)S 181 x(of)S 181 x(a)S
181 x(Thinwire)S 182 x(Multiport)S 598 y 5991 X(Repeater)S 153 x
(\(DEMPR\))S 152 x(and)S 153 x(connec)S 2 x(t)S 153 x(to)S 152 x(a)S
154 x(pair)S 153 x(of)S 153 x(twist)S -2 x(ed)S 154 x(wires,)S 155 x
(the)S 153 x(other)S 154 x(end)S 598 y 5991 X(of)S 166 x(which)S
166 x(is)S 166 x(connected)S 167 x(to)S 166 x(an)S 166 x(Ethernet)S
167 x(Node.)S 221 x(Attributes)S 166 x(are:)S 896 y 5991 X(\201)S
595 x(The)S 177 x(twisted)S 176 x(pair)S 177 x(wires)S 177 x(are)S
177 x(usually)S 178 x(not)S 177 x(Shielded,)S 180 x(as)S 177 x
(Coaxial)S 177 x(is,)S 180 x(so)S 177 x(it)S 598 y 6888 X(is)S 165 x
(less)S 166 x(immune)S 166 x(to)S 166 x(noise)S 166 x(than)S 166 x
(either)S 167 x(thickwire)S 166 x(or)S 166 x(thinwire.)S 897 y 5991 X
(\201)S 595 x(Instead)S 178 x(of)S 178 x(the)S 179 x(29)S 178 x
(nodes)S 179 x(you)S 179 x(could)S 179 x(normally)S 180 x(hang)S
179 x(off)S 179 x(of)S 178 x(the)S 179 x(DEMPR)S 598 y 6888 X(port,)S
166 x(you)S 167 x(only)S 167 x(get)S 166 x(one)S 167 x(T)S -35 x
(wisted)S 165 x(Pair)S 166 x(Node.)S 896 y 5991 X(\201)S 595 x(It)S
165 x(can)S 167 x(be)S 166 x(convenien)S 2 x(t)S 166 x(for)S 166 x
(sites)S 165 x(already)S 166 x(wired)S 166 x(with)S 166 x(twis)S
-2 x(ted)S 166 x(pair)S -37 x(.)S 897 y 5991 X(Enough)S 140 x(for)S
139 x(now)S 138 x(on)S 139 x(the)S 139 x(PHYSICAL)S 137 x(layer)S
-36 x(.)S 213 x(Let')S -19 x(s)S 138 x(look)S 139 x(at)S 139 x(some)S
138 x(DA)S -28 x(T)S -27 x(A)S 138 x(LINK)S 598 y 5991 X(stuff.)S
14729 Y 4796 X F24(1.3)S 348 x(Ethernet)S 233 x(Data)S 231 x(Link)S
233 x(layer)S 16522 Y 5991 X F151(The)S 112 x(data)S 111 x(which)S
112 x(travels)S 112 x(on)S 111 x(the)S 112 x(Ethernet)S 112 x
(medium,)S 123 x(be)S 111 x(it)S 111 x(Thickwire,)S 124 x(Thinire,)S
598 y 5991 X(or)S 126 x(\(Shudder\))S 125 x(T)S -35 x(wisted)S 124 x
(pair)S -37 x(,)S 134 x(all)S 125 x(looks)S 126 x(the)S 125 x(same.)S
208 x(When)S 125 x(the)S 126 x(tranceiver)S 126 x(starts)S 598 y
5991 X(talking,)S 172 x(he)S 171 x(\211rst)S 170 x(puts)S 170 x(out)S
170 x(a)S 170 x(PREAMBLE,)S 170 x(which)S 170 x(is)S 170 x(a)S 170 x
(64)S 170 x(bit)S 169 x(pattern)S 170 x(of)S 170 x(1')S -18 x(s)S
598 y 5991 X(and)S 198 x(0')S -18 x(s,)S 206 x(terminated)S 198 x
(with)S 198 x(two)S 197 x(1')S -19 x(s.)S 318 x(The)S 199 x
(preamble')S -19 x(s)S 198 x(job)S 198 x(in)S 199 x(life)S 198 x(is)S
197 x(to)S 198 x(wake)S 597 y 5991 X(up)S 203 x(all)S 203 x(the)S
204 x(nodes)S 203 x(on)S 203 x(the)S 204 x(Backbone,)S 213 x(and)S
203 x(let)S 203 x(them)S 203 x("Sync)S 204 x(up")S 203 x(to)S 203 x
(the)S 204 x(data)S 598 y 5991 X(stream.)S 209 x(After)S 130 x(the)S
130 x(Preamble)S 130 x(comes)S 129 x(the)S 130 x(real)S 130 x(data,)S
137 x(formatted)S 130 x(in)S 130 x(a)S 130 x("Packet".)S 21304 Y
4796 X F28(1.3.1)S 300 x(The)S 200 x(Ethernet)S 200 x(V2)S 199 x
(packe)S 2 x(t)S 23098 Y 5991 X F151(First)S 211 x(in)S 212 x(the)S
212 x(Ethernet)S 212 x(packet)S 212 x(is)S 211 x(the)S 211 x
(DESTINA)S -28 x(TION)S 211 x(address)S 211 x(\(Node)S 211 x(the)S
597 y 5991 X(packet)S 145 x(is)S 144 x(addressed)S 144 x(to\),)S
150 x(followed)S 144 x(by)S 145 x(the)S 145 x(SOURC)S -2 x(E)S 145 x
(address)S 144 x(\(Node)S 145 x(sending)S 598 y 5991 X(the)S 201 x
(packet\),)S 211 x(then)S 201 x(the)S 202 x(PROTOCO)S -2 x(L)S 201 x
(TYPE)S 201 x(\(DECNET)S -47 x(,)S 202 x(LA)S -28 x(T)S -46 x(,)S
202 x(TCPIP)S -64 x(,)S 201 x(etc.\),)S 598 y 5991 X(and)S 176 x
(then)S 176 x(from)S 176 x(46)S 176 x(to)S 176 x(1500)S 175 x(bytes)S
176 x(of)S 176 x(data.)S 250 x(Finally)S -54 x(,)S 179 x(the)S 176 x
(FCS)S 175 x(\(Frame)S 176 x(check)S 598 y 5991 X(sequence\))S 251 x
(is)S 249 x(sent)S 250 x(along)S 250 x(with)S 250 x(each)S 250 x
(packet.)S 474 x(The)S 251 x(FCS)S 249 x(is)S 250 x(a)S 250 x(CRC)S
248 x(value)S 597 y 5991 X(created)S 214 x(by)S 214 x(running)S 216 x
(the)S 213 x(packet)S 214 x(throug)S 2 x(h)S 214 x(a)S 213 x(CRC)S
213 x(generation)S 215 x(alogorythm.)S 598 y 5991 X(When)S 230 x
(the)S 230 x(packet)S 230 x(arrives)S 230 x(at)S 230 x(a)S 229 x
(node,)S 247 x(it)S 229 x(is)S 229 x(again)S 231 x(run)S 230 x
(through)S 231 x(the)S 230 x(CRC)S 598 y 5991 X(alogorythm,)S 168 x
(and)S 166 x(if)S 166 x(the)S 166 x(CRC)S 165 x(doesn')S -9 x(t)S
166 x(match-)S 166 x(Bad)S 165 x(Frame.)S 29901 Y 17158 X F152
(Ethernet)S 167 x(for)S 167 x(Idiots)S 498 x(1\2039)S
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3960 Y 5991 X F36(Figu)S 2 x(re)S 165 x(1\2031:)S 498 x(Ethernet)S
167 x(Packet)S
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6260 4467 XY F98
(_______________________________________________________________)S
499 y 5991 X(|)S 269 x(Destination)S 269 x(Addr)S 269 x(|)S 269 x
(Source)S 269 x(Addr)S 269 x(|)S 269 x(Protocol)S 269 x(Type)S 269 x
(|)S 269 x(Data)S 269 x(|)S 538 x(CRC)S 537 x(|)S 498 y 6260 X
(---------------------------------------------------------------)S
498 y 7336 X(6)S 269 x(Bytes)S 11909 X(6)S 269 x(Bytes)S 15944 X(2)S
269 x(Bytes)S 19979 X(??)S 807 x(4)S 269 x(Bytes)S 7157 Y 5991 X F151
(\201)S 595 x(Destination)S 217 x(Addr:)S 326 x(The)S 219 x
(Ethernet)S 219 x(address)S 217 x(of)S 218 x(the)S 219 x(node)S 218 x
(to)S 218 x(which)S 219 x(the)S 598 y 6888 X(packet)S 214 x(is)S
213 x(being)S 214 x(sent.)S 364 x(In)S 214 x(addition)S 213 x(to)S
214 x(sending)S 214 x(a)S 213 x(packet)S 214 x(to)S 214 x(a)S 213 x
(speci)S
(\211c)S 598 y 6888 X(node')S -19 x(s)S 228 x(address,)S 245 x(a)S
228 x(packet)S 229 x(can)S 229 x(be)S 229 x(sent)S 228 x(to)S 228 x
(a)S 229 x(Multicast)S 228 x(address)S 228 x(\(as)S 228 x(a)S 598 y
6888 X(V)S -56 x(AX')S -19 x(s)S 154 x(LA)S -27 x(T)S 155 x
("service)S 155 x(announc)S 2 x(ement")S 154 x(is\),)S 157 x(which)S
156 x(is)S 154 x(heard)S 155 x(by)S 156 x(more)S 155 x(than)S 597 y
6888 X(one)S 263 x(node)S 262 x(on)S 263 x(the)S 263 x(Ethernet.)S
511 x(It)S 262 x(can)S 262 x(also)S 262 x(be)S 263 x(sent)S 262 x
(to)S 262 x(a)S 262 x("Broadcast")S 598 y 6888 X(address,)S 166 x
(which)S 166 x(targets)S 166 x(ALL)S 166 x(nodes)S 166 x(on)S 167 x
(the)S 166 x(Ethernet.)S 897 y 5991 X(\201)S 595 x(Source)S 166 x
(Addr:)S 222 x(The)S 167 x(Ethernet)S 166 x(address)S 165 x(af)S
166 x(the)S 166 x(node)S 167 x(sending)S 167 x(the)S 166 x(packet.)S
896 y 5991 X(\201)S 595 x(Protocol)S 166 x(T)S -25 x(ype:)S 222 x
(60-03)S 166 x(for)S 166 x(DECNE)S -2 x(T)S -45 x(,)S 166 x(60-04)S
166 x(for)S 166 x(LA)S -27 x(T)S -46 x(,)S 167 x(etc.)S 897 y 5991 X
(\201)S 595 x(Data:)S 221 x(Between)S 165 x(46)S 166 x(and)S 167 x
(1500)S 166 x(bytes)S 165 x(of)S 166 x(data.)S 897 y 5991 X(\201)S
595 x(CRC:)S 165 x(CRC-32)S 165 x(polynomial)S 166 x(check)S 168 x
(on)S 166 x(the)S 166 x(rest)S 166 x(of)S 166 x(the)S 166 x(frame')S
-19 x(s)S 166 x(data.)S 14928 Y 4796 X F28(1.3.2)S 300 x(Ethernet)S
200 x(Addresses)S 16722 Y 5991 X F151(A)S 166 x(W)S -28 x(ord)S 167 x
(Here)S 166 x(about)S 167 x(Ethernet)S 166 x(addresses)S 165 x(and)S
167 x(Protocol)S 167 x(T)S -26 x(ypes.)S 223 x(Every)S 167 x(node)S
597 y 5991 X(which)S 144 x(connects)S 144 x(to)S 143 x(the)S 143 x
(Ethernet)S 144 x(must)S 143 x(have)S 144 x(a)S 144 x(UNIQUE)S 142 x
(address,)S 148 x(since)S 143 x(the)S 598 y 5991 X(address)S 176 x
(is)S 176 x(what')S -19 x(s)S 176 x(used)S 177 x(to)S 176 x(send)S
177 x(packets)S 176 x(to)S 177 x(a)S 176 x(Node,)S 180 x(or)S 177 x
(to)S 176 x(tell)S 176 x(which)S 177 x(Node)S 598 y 5991 X(sent)S
166 x(a)S 166 x(packet.)S 896 y 5991 X(Xerox)S 252 x(corp.)S 480 x
(is)S 252 x(the)S 252 x(GrandPoobah)S 253 x(of)S 251 x(Ethernet)S
253 x(addresses)S 251 x(and)S 252 x(Protocol)S 598 y 5991 X(types.)S
361 x(If)S 212 x(you)S 213 x(are)S 212 x(a)S 213 x(manufacturer)S
213 x(of)S 212 x(Ethernet)S 213 x(devices,)S 225 x(you)S 213 x(MUST)S
212 x(buy)S 598 y 5991 X(a)S 140 x("Block")S 139 x(of)S 139 x
(unique)S 141 x(Ethernet)S 140 x(Hardware)S 139 x(addresses)S 139 x
(from)S 139 x(XEROX)S 138 x(to)S 139 x(use)S 140 x(in)S 598 y 5991 X
(your)S 124 x(devices.)S 208 x(This)S 124 x(assures)S 122 x(that)S
124 x(you)S 124 x(can)S 124 x(plug)S 124 x(your)S 124 x("Box")S 123 x
(onto)S 123 x(an)S 124 x(Ethernet)S 597 y 5991 X(LAN)S 274 x
(anywhere)S 276 x(on)S 274 x(the)S 275 x(planet,)S 302 x(and)S 274 x
(not)S 275 x(have)S 275 x(the)S 275 x(same)S 274 x(HARD)S -2 x(W)S
-46 x(ARE)S 598 y 5991 X(address)S 180 x(as)S 181 x(any)S 182 x
(other)S 182 x(node.)S 267 x(So)S 181 x(you)S 182 x(get)S 182 x
(YOUR)S 180 x(packets,)S 185 x(and)S 182 x(other)S 181 x(nodes)S
598 y 5991 X(get)S 166 x(THEIR)S 166 x(packets.)S 24791 Y 5991 X(At)S
179 x(this)S 180 x(point,)S 183 x(it')S -19 x(s)S 180 x(necessary)S
180 x(to)S 179 x(take)S 180 x(a)S 180 x(closer)S 180 x(look)S 180 x
(at)S 180 x(the)S 180 x(DESTIN)S -2 x(A)S -27 x(TION)S 598 y 5991 X
(address)S 246 x(\211eld.)S 462 x(The)S 247 x(DESTINA)S -29 x(TION)S
246 x(address)S 246 x(is)S 246 x(the)S 246 x(FIRST)S 246 x(part)S
246 x(of)S 246 x(the)S 598 y 5991 X(packet)S 116 x(to)S 116 x
(appear)S 116 x(on)S 116 x(the)S 116 x(Ethernet,)S 127 x(and)S 116 x
(the)S 116 x(\211rst)S 116 x(TWO)S 115 x(BITS)S 115 x(of)S 116 x
(that)S 116 x(address)S 598 y 5991 X(\(as)S 113 x(it)S 114 x
(appears)S 114 x(on)S 114 x(the)S 114 x(Ethernet\))S 114 x(tell)S
114 x(us)S 114 x(something)S 115 x(special)S 113 x(about)S 114 x
(the)S 114 x(packet.)S 597 y 5991 X(The)S 211 x(\211rst)S 210 x(two)S
209 x(bits)S 209 x(on)S 210 x(the)S 211 x(Ethernet)S 210 x(are)S
210 x(the)S 210 x(two)S 209 x(LEAST)S 210 x(SIGNIFIC)S -2 x(ANT)S
598 y 5991 X(BITS)S 125 x(of)S 125 x(the)S 126 x(MOST)S 125 x
(SIGNIFICA)S -2 x(NT)S 126 x(BYTE)S 125 x(of)S 125 x(the)S 126 x
(DESTINA)S -29 x(TION)S 125 x(Address.)S 598 y 5991 X(So,)S 166 x
(for)S 167 x(address:)S 29901 Y 4796 X F152(1\20310)S 498 x
(Ethernet)S 167 x(for)S 166 x(Idiots)S
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1000 BP 39600 30600 PM 0 0 XY
3950 Y 5991 X F151(08-00-2B-XX)S -2 x(-XX-XX)S 897 y 5991 X(The)S
189 x(Most)S 188 x(signi\211cant)S 189 x(Byte)S 188 x(is)S 188 x
("08".)S 288 x(That)S 188 x(appears)S 188 x(on)S 189 x(the)S 188 x
(Ethernet)S 189 x(LSbit)S 598 y 5991 X(\211rst,)S 209 x(MSbit)S 200 x
(last.)S 323 x(So)S 200 x("08")S 200 x(get)S 200 x(physically)S 201 x
(transmitted)S 199 x(onto)S 201 x(the)S 200 x(Ethernet)S 598 y 5991 X
(as)S 209 x("0,0,0,1,0,)S 2 x(0,0,0".)S 351 x(A)S 209 x("09")S 209 x
(would)S 208 x(be)S 209 x(transmitted)S 209 x(onto)S 209 x(the)S
209 x(Ethernet)S 210 x(as)S 597 y 5991 X("1,0,0,1,)S 2 x(0,0,0,0".)S
223 x(Still)S 165 x(with)S 166 x(me?)S 8434 Y 5991 X(Let')S -19 x(s)S
166 x(consider)S 166 x(the)S 167 x(addresses:)S 896 y 5991 X
(09-00-XX-XX)S -2 x(-XX-XX)S 165 x(or)S 166 x(AB-XX-)S -2 x
(XX-XX-XX)S -2 x(-XX.)S 11124 Y 5991 X(If)S 115 x(the)S 116 x
(\211rst)S 116 x(bit)S 115 x(to)S 115 x(appear)S 116 x(is)S 115 x(a)S
116 x("1",)S 125 x(as)S 116 x(above,)S 126 x(then)S 117 x(that)S
115 x(identi\211es)S 116 x(this)S 115 x(address)S 597 y 5991 X(as)S
127 x(a)S 127 x("MUL)S -27 x(TICAST")S 126 x(address,)S 135 x
(targeting)S 128 x(multiple)S 127 x(nodes.)S 209 x(If)S 126 x(ALL)S
128 x(Bits)S 126 x(in)S 127 x(the)S 598 y 5991 X(address)S 165 x
(are)S 167 x("1"s,)S 165 x(as)S 166 x(in:)S 897 y 5991 X
(FF-FF-FF-FF)S 2 x(-FF-FF)S 896 y 5991 X(Then)S 167 x(this)S 166 x
(is)S 165 x(a)S 166 x("BROAD)S -2 x(CAST")S 165 x(address,)S 166 x
(targeting)S 167 x(ALL)S 167 x(nodes.)S 15906 Y 5991 X(Now)S -46 x
(,)S 189 x(for)S 184 x(the)S 185 x(second)S 184 x(bit.)S 276 x(If)S
183 x(the)S 185 x(second)S 184 x(bit)S 184 x(is)S 184 x("0",)S 188 x
(as)S 184 x(in)S 184 x(the)S 185 x(HARD)S -2 x(W)S -46 x(ARE)S 597 y
5991 X(address)S 279 x(08-XX-XX)S -2 x(-XX-XX-X)S -2 x(X,)S 280 x
(then)S 280 x(this)S 279 x(is)S 279 x(a)S 280 x("Globally)S 279 x
(administered")S 598 y 5991 X(address,)S 160 x(assigned)S 159 x(by)S
160 x(XERO)S -2 x(X,)S 159 x(and)S 159 x(guaran)S 2 x(teed)S 159 x
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167 x(the)S 166 x(planet.)S 897 y 5991 X(If)S 167 x(the)S 168 x
(Second)S 168 x(bit)S 167 x(is)S 167 x(a)S 167 x("1",)S 168 x(as)S
167 x(in)S 168 x(AA-00-X)S -2 x(X-XX-XX-)S -2 x(XX,)S 168 x(then)S
168 x(this)S 167 x(is)S 167 x(a)S 167 x("Lo-)S 597 y 5991 X(cally)S
206 x(administered")S 206 x(address,)S 215 x(and)S 206 x(it)S 206 x
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(LOCAL)S 598 y 5991 X(network)S 213 x(administrator)S 212 x(to)S
212 x(make)S 213 x(sure)S 212 x(the)S 213 x(address)S 212 x(is)S
212 x(unique.)S 362 x(DEC)S -2 x(NET)S 598 y 5991 X(PHYSICAL)S 232 x
(addresses,)S 249 x(discussed)S 232 x(next,)S 251 x(are)S 233 x
("Locally)S 234 x(Administered")S 232 x(ad-)S 598 y 5991 X(dresses.)S
896 y 5991 X(Now)S -46 x(,)S 243 x(most)S 226 x(nodes)S 227 x(are)S
227 x(happy)S 228 x(to)S 227 x(use)S 227 x(the)S 227 x(HARDW)S -47 x
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156 x(by)S 157 x(XERO)S -2 x(X)S 156 x(\(usually)S 157 x(residing)S
156 x(in)S 157 x(an)S 156 x(address)S 156 x(ROM\).)S 155 x
(DECservers,)S 158 x(for)S 598 y 5991 X(instance,)S 221 x(will)S
210 x(always)S 209 x(have)S 210 x(addresses)S 209 x(which)S 210 x
(look)S 211 x(like)S 210 x(08-00-2B-X)S -2 x(X-XX-)S 597 y 5991 X
(XX.)S 178 x(This)S 179 x(is)S 178 x(the)S 178 x(HARDW)S -47 x(ARE)S
177 x(address.)S 259 x(There)S 179 x(is)S 178 x(another)S 179 x
(type)S 179 x(of)S 178 x(address)S 598 y 5991 X(which)S 231 x(a)S
230 x(node)S 231 x(can)S 230 x(use,)S 247 x(and)S 231 x(that')S -19 x
(s)S 230 x(called)S 230 x(the)S 231 x(PHYSICA)S -2 x(L)S 231 x
(address.)S 414 x(It')S -19 x(s)S 598 y 5991 X(going)S 144 x(to)S
143 x(look)S 143 x(like)S 143 x(AA-00-04-)S -2 x(00-XX-XX.)S 142 x
(V)S -56 x(AXes)S 142 x(runnin)S 2 x(g)S 143 x(DECNE)S -2 x(T)S 143 x
(will)S 142 x(use)S 598 y 5991 X(this)S 166 x(PHYSICAL,)S 165 x
(LOCALL)S -46 x(Y)S 166 x(administered)S 165 x(address.)S 896 y
5991 X(Y)S -56 x(ou)S 295 x(see,)S 325 x(our)S 295 x(Ethernet)S 294 x
(boards)S 293 x(allow)S 293 x(us)S 294 x(to)S 293 x(choose:)S 478 x
(W)S -28 x(e)S 294 x(can)S 294 x(use)S 294 x(the)S 598 y 5991 X
(HARDW)S -47 x(ARE)S 256 x(address)S 257 x(given)S 259 x(to)S 258 x
(us)S 258 x(by)S 258 x(XERO)S -2 x(X,)S 258 x(taken)S 259 x(from)S
257 x(ROM,)S 258 x(and)S 598 y 5991 X(guaranteed)S 196 x(to)S 195 x
(be)S 195 x(unique,)S 203 x(or)S 195 x(we)S 195 x(can)S 195 x
(override)S 196 x(that)S 195 x(and)S 195 x(TELL)S 195 x(the)S 195 x
(board)S 598 y 5991 X(what)S 177 x(address)S 176 x(to)S 177 x(use.)S
255 x(V)S -55 x(AXes)S 176 x(running)S 179 x(DECNE)S -2 x(T)S 178 x
(will)S 176 x(run)S 178 x(their)S 178 x(DEC)S -2 x(NET)S 29901 Y
16918 X F152(Ethernet)S 167 x(for)S 166 x(Idiots)S 499 x(1\2031)S
-37 x(1)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(address)S 157 x(through)S 160 x(a)S 158 x(little)S
157 x(conversion,)S 161 x(and)S 158 x(use)S 158 x(that)S 158 x(for)S
158 x(their)S 158 x(new)S 158 x(Ethernet)S 598 y 5991 X(PHYSICAL)S
165 x(address.)S 221 x(Here')S -18 x(s)S 165 x(how)S 166 x(it)S 166 x
(works:)S 897 y 5991 X(T)S -31 x(ake)S 142 x(the)S 141 x(DECNET)S
140 x(AREA)S 139 x(number)S -36 x(,)S 147 x(multiply)S 141 x(it)S
141 x(by)S 141 x(1024,)S 146 x(and)S 142 x(then)S 141 x(add)S 141 x
(the)S 598 y 5991 X(DECNET)S 173 x(NODE)S 174 x(number)S 175 x(to)S
175 x(that.)S 248 x(Convert)S 175 x(this)S 174 x(number)S 176 x(to)S
174 x(hexadecimal,)S 597 y 5991 X(and)S 166 x(then)S 167 x(do)S 166 x
(a)S 166 x(BYTE)S 165 x(SW)S -46 x(AP)S -64 x(.)S 166 x(So,)S 166 x
(For)S 167 x(DECNET)S 165 x(node)S 166 x(#)S 166 x(1.001:)S 897 y
5991 X(\201)S 595 x(The)S 166 x(Area)S 166 x(\(1\))S 166 x(X)S 166 x
(1024)S 166 x(=)S 166 x(1024.)S 897 y 5991 X(\201)S 595 x(Add)S 165 x
(the)S 166 x(NODE)S 165 x(#)S 166 x(\(1024)S 166 x(+)S 166 x(1\))S
166 x(=)S 166 x(1025.)S 896 y 5991 X(\201)S 595 x(Convert)S 166 x
(to)S 166 x(HEX)S 166 x(=)S 165 x(0401)S 897 y 5991 X(\201)S 595 x
(Swap)S 165 x(Bytes)S 166 x(-)S 166 x(0104)S 896 y 5991 X(\201)S
595 x(New)S 165 x(Physical)S 167 x(address)S 165 x(-)S 166 x
(AA-00-04-00-01-04)S 897 y 5991 X(Jeepers,)S 194 x(that)S 188 x(was)S
188 x(so)S 188 x(much)S 189 x(fun,)S 194 x(let')S -19 x(s)S 188 x
(try)S 189 x(it)S 188 x(again!)S 289 x(For)S 189 x(DECNE)S -2 x(T)S
189 x(node)S 188 x(#)S 598 y 5991 X(3.429:)S 896 y 5991 X(\201)S
595 x(The)S 166 x(Area)S 166 x(\(3\))S 166 x(X)S 166 x(1024)S 166 x
(=)S 166 x(3072.)S 897 y 5991 X(\201)S 595 x(Add)S 165 x(the)S 166 x
(NODE)S 165 x(#)S 166 x(\(3072)S 166 x(+)S 166 x(429\))S 166 x
(=3501.)S 897 y 5991 X(\201)S 595 x(Convert)S 166 x(to)S 166 x(HEX)S
166 x(=)S 165 x(0DAD)S 896 y 5991 X(\201)S 595 x(Swap)S 165 x(Bytes)S
166 x(-)S 166 x(AD0D)S 897 y 5991 X(\201)S 595 x(New)S 165 x
(Physical)S 167 x(address)S 165 x(-)S 166 x(AA-00-04-00-AD)S -2 x
(-0D)S 897 y 5991 X(What)S 306 x(this)S 305 x(means)S 305 x(is)S
306 x(that)S 305 x(if)S 306 x(we)S 305 x(choose)S 306 x(to)S 306 x
(muck)S 306 x(around,)S 342 x(\(Shameful)S 597 y 5991 X(behaviour!)S
296 x(Fire)S 191 x(&)S 191 x(Brimstone!)S 294 x(Cats)S 190 x(&)S
190 x(Dogs)S 190 x(living)S 192 x(together!\))S 296 x(and)S 190 x
(NOT)S 598 y 5991 X(USE)S 214 x(the)S 216 x(HARD)S -2 x(W)S -46 x
(ARE)S 214 x(Ethernet)S 215 x(address)S 215 x(that)S 215 x(Xerox)S
215 x(gave)S 216 x(us,)S 228 x(we)S 215 x(must)S 598 y 5991 X(make)S
160 x(SURE)S 159 x(that)S 159 x(we)S 159 x(don')S -9 x(t)S 160 x
(have)S 160 x(two)S 159 x(or)S 160 x(more)S 160 x(nodes)S 160 x(on)S
160 x(the)S 159 x(LAN)S 160 x(with)S 159 x(the)S 598 y 5991 X(same)S
138 x(Ethernet)S 139 x(address.)S 212 x(Or)S 139 x(Else.)S 212 x
(This)S 139 x(becomes)S 138 x(most)S 138 x(important)S 139 x(when)S
139 x(we)S 597 y 5991 X(start)S 184 x(linking)S 185 x(together)S
185 x(LANs)S 184 x(using)S 185 x(T)S -31 x(ranslan)S 184 x(bridges-)S
185 x(we)S 183 x(MUST)S 185 x(be)S 184 x(sure)S 598 y 5991 X(that)S
166 x(all)S 166 x(nodes)S 166 x(running)S 168 x(DECNE)S -2 x(T)S
167 x(have)S 167 x(unique)S 167 x(DECNE)S -2 x(T)S 166 x(addresses.)S
22799 Y 4796 X F28(1.3.3)S 300 x(Protocol)S 200 x(T)S -44 x(ypes)S
896 y 5991 X F151(A)S 149 x(brief)S 149 x(mention)S 150 x(of)S 149 x
(Ethernet)S 149 x(Protocol)S 150 x(T)S -25 x(ypes.)S 216 x(A)S 149 x
(V)S -56 x(AX)S 149 x(can)S 150 x(run)S 150 x(many)S 150 x(differ-)S
598 y 5991 X(ent)S 147 x(communications)S 147 x(protocols)S 147 x
(on)S 147 x(his)S 147 x(Ethernet)S 147 x(controller)S 148 x
(simultaneously)S -55 x(.)S 598 y 5991 X(These)S 147 x(are)S 148 x
(kept)S 147 x(track)S 147 x(of)S 147 x(by)S 148 x(the)S 147 x
("Higher)S 148 x(Level")S 147 x(software)S 147 x(layers)S 147 x
(mentioned)S 598 y 5991 X(earlier)S -37 x(.)S 330 x(Suf\211ce)S 203 x
(it)S 202 x(to)S 201 x(say)S 203 x(that)S 201 x(a)S 202 x(few)S 202 x
(of)S 202 x(the)S 202 x(values)S 203 x(you)S 203 x(might)S 202 x
(see)S 202 x(in)S 202 x(the)S 597 y 5991 X("Protocol)S 166 x(T)S
-25 x(ype")S 166 x(\211eld)S 166 x(of)S 166 x(the)S 167 x(Ethernet)S
166 x(packet)S 166 x(are:)S 29901 Y 4796 X F152(1\20312)S 498 x
(Ethernet)S 151 x(for)S 149 x(Idiots)S
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1000 BP 39600 30600 PM 0 0 XY
4198 Y 4796 X F36(T)S -37 x(able)S 150 x(1\2032:)S 498 x(Ethernet)S
150 x(Protocol)S 151 x(T)S -37 x(ypes)S 224 y 4796 X 17928 24 R 598 y
4796 X F157(Protocol)S 8183 X(T)S -24 x(ype)S 14011 X(Description)S
299 y 4796 X 17928 24 R 647 y 4796 X F155(90-00)S 8183 X(LoopBack)S
14011 X(Ethernet)S 173 x(Cross-company)S 172 x(Loopback)S 548 y
14011 X(protocol)S 897 y 4796 X(60-01)S 8183 X(DEC_MOPDL)S 14011 X
(DEC)S 158 x(Maintenance)S 160 x(Operations)S 159 x(Protocol)S 548 y
14011 X(DownLoad)S 896 y 4796 X(60-02)S 8183 X(DEC_MOPRC)S 14011 X
(DEC)S 158 x(Maintenance)S 160 x(Operations)S 159 x(Protocol)S 548 y
14011 X(Remote)S 149 x(Console)S 897 y 4796 X(60-03)S 8183 X
(DEC_NET)S 14011 X(DEC)S 168 x(network)S 170 x(or)S 169 x(routing)S
170 x(layer)S 170 x(\(Our)S 548 y 14011 X(buddy)S 150 x(DECNET!\))S
896 y 4796 X(60-04)S 8183 X(DEC_LA)S -26 x(T)S 14011 X(DEC)S 153 x
(Local)S 155 x(Area)S 155 x(T)S -28 x(ransport)S 155 x(\(Hero)S 155 x
(of)S 155 x(this)S 548 y 14011 X(story!\))S 897 y 4796 X(60-05)S
8183 X(DEC_DIAG)S 14011 X(DEC)S 149 x(Diagnostics)S 149 x(protocol)S
151 x(T)S -23 x(ype)S 897 y 4796 X(60-06)S 8183 X(DEC_C_USE)S 14011 X
(DEC)S 176 x(protocol)S 178 x(reserved)S 178 x(for)S 177 x(use)S
177 x(by)S 548 y 14011 X(customers)S 896 y 4796 X(60-07)S 8183 X
(DEC_LA)S -51 x(VC)S 14011 X(DEC)S 149 x(SCA)S 149 x(\(NI)S 150 x
(Clusters\))S 897 y 4796 X(80-3F)S 8183 X(DEC_L)S -26 x(TM)S 14011 X
(DEC)S 149 x(LAN)S 149 x(T)S -28 x(raf\211c)S 150 x(Monitor)S 897 y
4796 X(80-38)S 8183 X(DEC_BR)S -2 x(IDGE)S 14011 X(DEC)S 181 x
(RBMS,)S 181 x(SP)S -33 x(ANNING)S 183 x(TREE)S 547 y 14011 X
(PROTOCOL)S 897 y 4796 X(80-80)S 8183 X(VIT)S -25 x(A_BRIDGE)S 14011 X
(VIT)S -25 x(ALINK)S 162 x(BRIDGE)S 161 x(MANAGEMENT)S 548 y 14011 X
(PROTOCOL)S 897 y 4796 X(08-00)S 8183 X(DOD_TCPIP)S 14011 X(Dept.)S
224 x(of)S 150 x(Defense)S 150 x(TCPIP)S 896 y 4796 X(80-9B)S 8183 X
(APPLE_IP)S 14011 X(Apple)S 150 x(Co.)S 224 x(AppleT)S -27 x(alk)S
897 y 4796 X(06-00)S 8183 X(XRX_X)S -2 x(NX)S 14011 X(Xerox)S 149 x
(XNX)S 398 y 4796 X 17928 24 R 23500 Y 5991 X F151(And)S 166 x(many)S
-55 x(,)S 167 x(many)S 167 x(others.)S 29901 Y 16881 X F152
(Ethernet)S 167 x(for)S 167 x(Idiots)S 498 x(1\20313)S
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1000 BP 39600 30600 PM 0 0 XY
4104 Y 4796 X F24(1.4)S 348 x(802.3)S 231 x(and)S 232 x(other)S 233 x
(digressions)S 5897 Y 5991 X F151(802.3)S 292 x(is)S 290 x(a)S 291 x
(standard)S 291 x(put)S 291 x(forth)S 292 x(by)S 292 x(the)S 291 x
(IEEE)S 290 x(Computer)S 291 x(Society)S -55 x(.)S 597 x(It')S -19 x
(s)S 598 y 5991 X(ALMOST)S 266 x(the)S 266 x(same)S 266 x(as)S 266 x
(Ethernet,)S 292 x(with)S 266 x(a)S 266 x(few)S 265 x(hardware)S
267 x(and)S 266 x(software)S 597 y 5991 X(differences.)S 282 x(Just)S
185 x(enoug)S 2 x(h)S 186 x(to)S 186 x(make)S 186 x(the)S 186 x(two)S
186 x(incompatible.)S 281 x(DEC)S 185 x(STD)S 185 x(134)S 598 y
5991 X(Ethernet)S 176 x(V2.0)S 175 x(is)S 176 x(what)S 175 x(WE)S
175 x(\(Digital\))S 175 x(currently)S 177 x(adhere)S 176 x(to.)S
250 x(In)S 176 x(response)S 175 x(to)S 598 y 5991 X(the)S 191 x
(overwhelming)S 193 x(support)S 190 x(for)S 192 x(the)S 191 x(802.3)S
191 x(standard)S 191 x(worldwide,)S 197 x(DEC)S -2 x(NET)S 598 y
5991 X(Phase)S 178 x(5)S 177 x(will)S 176 x(be)S 178 x(802.3)S 177 x
(compliant,)S 181 x(while)S 177 x(still)S 176 x(retaining)S 178 x
(the)S 178 x(ability)S 177 x(to)S 177 x(talk)S 597 y 5991 X(with)S
166 x(Ethernet)S 166 x(V2)S 166 x(nodes.)S 11277 Y 5991 X(Ethernet)S
270 x(and)S 270 x(802.3)S 270 x(nodes)S 270 x(can)S 270 x(share)S
270 x(the)S 270 x(same)S 269 x(backbone,)S 297 x(since)S 270 x(both)S
597 y 5991 X(adhere)S 141 x(to)S 140 x(the)S 141 x(same)S 139 x
(CSMA/CD)S 140 x(standards-)S 139 x(An)S 141 x(Ethernet)S 140 x
(node)S 141 x(will)S 140 x(not)S 140 x(talk)S 598 y 5991 X(while)S
196 x(a)S 196 x(802.3)S 197 x(node)S 197 x(is)S 196 x(talking,)S
205 x(and)S 196 x(visa-versa.)S 313 x(The)S 197 x(primary)S 197 x
(differences)S 598 y 5991 X(are:)S 14265 Y 4796 X F28(1.4.1)S 300 x
(802.3)S 201 x(SOFTW)S -33 x(ARE)S 897 y 5991 X F151(-)S 166 x(The)S
167 x(primary)S 166 x(difference)S 167 x(of)S 166 x(802.3)S 167 x
(is)S 165 x(at)S 166 x(the)S 166 x(DA)S -28 x(T)S -27 x(A)S 166 x
(LINK)S 166 x(level.)S 222 x(The)S 167 x(802.3)S 598 y 5991 X
(packet)S 166 x(is)S 166 x(structured)S 166 x(differently)S 167 x
(than)S 166 x(the)S 167 x(Ethernet)S 166 x(V2)S 166 x(packet.)S
16955 Y 5991 X F36(Figu)S 2 x(re)S 165 x(1\2032:)S 498 x(802.3)S
167 x(Packet)S 110 y 6260 X F98
(____________________________________________________________________)S
(______)S 498 y 5991 X(|)S 269 x(Destination)S 269 x(Addr)S 269 x(|)S
269 x(Source)S 269 x(Addr)S 269 x(|)S 269 x(Length)S 269 x
(|DSAP|SSAP|Ctl|)S 269 x(Data)S 268 x(|Pad|)S 538 x(CRC)S 538 x(|)S
498 y 6260 X
(--------------------------------------------------------------------)S
(------)S 498 y 6529 X(Bytes:)S 807 x(6)S 12985 X(6)S 15944 X(2)S
17827 X(2)S 19172 X(2)S 807 x(1-2)S 22130 X(?)S 23475 X(?)S 25089 X
(4)S 19755 Y 5991 X F151(\201)S 595 x(Destination)S 217 x(Addr:)S
326 x(The)S 219 x(Ethernet)S 219 x(address)S 217 x(of)S 218 x(the)S
219 x(node)S 218 x(to)S 218 x(which)S 219 x(the)S 597 y 6888 X
(packet)S 214 x(is)S 213 x(being)S 214 x(sent.)S 364 x(In)S 214 x
(addition)S 213 x(to)S 214 x(sending)S 214 x(a)S 213 x(packet)S 214 x
(to)S 214 x(a)S 213 x(speci\211c)S 598 y 6888 X(node')S -19 x(s)S
162 x(address,)S 163 x(a)S 162 x(packet)S 163 x(can)S 162 x(be)S
162 x(sent)S 163 x(to)S 162 x(a)S 162 x(Multicast)S 162 x(address)S
161 x(which)S 163 x(is)S 598 y 6888 X(heard)S 157 x(by)S 157 x(more)S
156 x(than)S 157 x(one)S 157 x(node)S 157 x(on)S 157 x(the)S 157 x
(Ethernet.)S 219 x(It)S 156 x(can)S 157 x(also)S 156 x(be)S 156 x
(sent)S 156 x(to)S 598 y 6888 X(a)S 166 x("Broadcast")S 165 x
(address,)S 165 x(which)S 167 x(targets)S 166 x(ALL)S 166 x(nodes)S
166 x(on)S 167 x(the)S 166 x(Ethernet.)S 896 y 5991 X(\201)S 595 x
(Source)S 166 x(Addr:)S 222 x(The)S 167 x(Ethernet)S 166 x(address)S
165 x(af)S 166 x(the)S 166 x(node)S 167 x(sending)S 167 x(the)S 166 x
(packet.)S 897 y 5991 X(\201)S 595 x(Length:)S 375 x(The)S 242 x
(number)S 243 x(of)S 242 x(bytes)S 242 x(in)S 242 x(the)S 243 x
(DSAP)S -65 x(,)S 242 x(SSAP)S -65 x(,)S 243 x(Ctl,)S 261 x(and)S
242 x(Data)S 598 y 6888 X(\211elds.)S 896 y 5991 X(\201)S 595 x
(DSAP:)S 165 x(Destination)S 166 x(Service)S 167 x(Access)S 165 x
(Point)S 166 x(address.)S 897 y 5991 X(\201)S 595 x(SSAP:)S 166 x
(Source)S 166 x(Service)S 167 x(Access)S 166 x(Point)S 166 x
(address.)S 897 y 5991 X(\201)S 595 x(Ctl:)S 221 x(Logical)S 167 x
(Link)S 167 x(Control)S 166 x(\211eld.)S 222 x(Either)S 166 x(UI,)S
166 x(XID,)S 166 x(or)S 166 x(T)S -46 x(est)S 166 x(frame.)S 896 y
5991 X(\201)S 595 x(Data:)S 221 x(Between)S 165 x(46)S 166 x(and)S
167 x(1500)S 166 x(bytes)S 165 x(of)S 166 x(data.)S 29901 Y 4796 X
F152(1\20314)S 498 x(Ethernet)S 167 x(for)S 166 x(Idiots)S
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1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(\201)S 595 x(Pad:)S 215 x(Pad)S 154 x(bytes,)S
157 x(if)S 153 x(necessary)S -55 x(,)S 157 x(to)S 153 x(bring)S 155 x
(frame)S 153 x(up)S 154 x(to)S 153 x(64)S 154 x(byte)S 154 x
(minimum.)S 897 y 5991 X(\201)S 595 x(CRC:)S 165 x(CRC-32)S 165 x
(polynomial)S 166 x(check)S 168 x(on)S 166 x(the)S 166 x(rest)S 166 x
(of)S 166 x(the)S 166 x(frame')S -19 x(s)S 166 x(data.)S 6659 Y
5991 X(SAP)S 184 x(\(DSA)S -2 x(P)S 184 x(or)S 184 x(SSAP\))S 184 x
(addresses)S 182 x(are)S 184 x(assigned)S 184 x(only)S 185 x(to)S
183 x(ST)S -27 x(ANDAR)S -2 x(DIZED)S 598 y 5991 X(protocols.)S 203 x
(For)S 112 x(NON-Sta)S -2 x(ndard)S 112 x(protocols,)S 122 x(there)S
111 x(is)S 110 x(also)S 111 x(another)S 111 x(802.3)S 111 x(frame)S
598 y 5991 X(type,)S 186 x(called)S 182 x(the)S 181 x(SNAP)S 181 x
(frame.)S 269 x(For)S 182 x(more)S 181 x(info,)S 186 x(see)S 182 x
(the)S 181 x(DECNET)S 181 x(Phase)S 181 x(5)S 598 y 5991 X
(document.)S 9648 Y 4796 X F28(1.4.2)S 300 x(802.3)S 201 x(Hardware)S
11441 Y 5991 X F151(802.3)S 150 x(T)S -31 x(ranceivers)S 150 x
(supply)S 150 x(the)S 150 x(same)S 148 x(signals)S 150 x(to)S 149 x
(their)S 149 x(respective)S 150 x(controllers)S 598 y 5991 X(as)S
156 x(do)S 157 x(Ethernet)S 156 x(tranceivers,)S 160 x(on)S 157 x
(the)S 156 x(same)S 156 x(pins.)S 219 x(The)S 157 x(primary)S 157 x
(difference)S 157 x(in)S 598 y 5991 X(an)S 169 x(802.3)S 169 x
(tranceiver)S 170 x(is)S 168 x(in)S 170 x(the)S 169 x("Heartbeat")S
168 x(or)S 169 x(SQE)S 167 x(\(Signal)S 169 x(Quality)S 169 x
(Error\))S 598 y 5991 X(signal)S 150 x(supplied)S 149 x(to)S 150 x
(the)S 150 x(transmitting)S 150 x(Node)S 149 x(after)S 150 x(packet)S
150 x(transmission.)S 216 x(The)S 597 y 5991 X(802.3)S 279 x
(Heartbeat)S 278 x(is)S 278 x(supplied)S 278 x(within)S 278 x(a)S
278 x(different)S 279 x("T)S -13 x(ime)S 278 x(W)S -19 x(indow")S
278 x(after)S 598 y 5991 X(packet)S 120 x(transmission,)S 128 x(and)S
120 x(for)S 119 x(a)S 120 x(different)S 119 x(length)S 120 x(of)S
120 x(time,)S 129 x(than)S 119 x(the)S 120 x(Ethernet)S 598 y 5991 X
(V2)S 166 x(tranceiver)S 28 x(')S -19 x(s)S 166 x(Heartbeat.)S 16821 Y
5991 X(Generally)S 233 x(speaking,)S 251 x(any)S 233 x(given)S 234 x
(Node)S 233 x(will)S 232 x(only)S 233 x(work)S 233 x(with)S 232 x
(ONE)S 232 x(or)S 233 x(the)S 598 y 5991 X(OTHER)S 212 x(type)S 214 x
(of)S 213 x(tranceiver)S -36 x(,)S 225 x(but)S 214 x(not)S 213 x
(both.)S 363 x(DIGIT)S -28 x(AL)S 213 x(Ethernet)S 213 x(products)S
598 y 5991 X(\(except)S 207 x(the)S 207 x(DEREP\))S 206 x(can)S 207 x
(work)S 207 x(with)S 207 x(NO)S 206 x(HEARTBEA)S -29 x(T)S -46 x(,)S
208 x(and)S 207 x(most)S 206 x(802.3)S 597 y 5991 X(tranceivers)S
215 x(permit)S 213 x(the)S 215 x(Heartbeat)S 213 x(to)S 214 x(be)S
214 x(turned)S 215 x(off.)S 365 x(T)S -35 x(urning)S 216 x(off)S
213 x(Heart-)S 598 y 5991 X(beat)S 149 x(removes)S 149 x(the)S 150 x
(HARD)S -2 x(W)S -46 x(ARE)S 148 x(difference)S 150 x(from)S 149 x
(802.3)S 149 x(and)S 150 x(Ethernet)S 149 x(tran-)S 598 y 5991 X
(ceivers.)S 21005 Y 4796 X F28(1.4.3)S 300 x("T)S -44 x(en)S 200 x
(BASE)S 198 x(WHA)S -45 x(T?")S 22799 Y 5991 X F151(Y)S -56 x(ou)S
166 x(might)S 166 x(occasionally)S 166 x(hear)S 165 x(the)S 166 x
(phrases)S 165 x("10base2")S 164 x(or)S 165 x("10base5")S 165 x
(used)S 165 x(in)S 598 y 5991 X(refence)S 174 x(to)S 173 x
(Ethernet.)S 244 x(These)S 174 x(phrases)S 173 x(will)S 172 x
(probably)S 174 x(be)S 173 x(heard)S 174 x(coming)S 174 x(from)S
597 y 5991 X(funny)S 169 x(looking)S 168 x(guys)S 168 x(with)S 167 x
(slide)S 166 x(rules)S 168 x(on)S 167 x(their)S 168 x(hips,)S 167 x
(hoping)S 169 x(to)S 167 x(confuse)S 167 x(you)S 598 y 5991 X(so)S
127 x(they)S 129 x(can)S 128 x(smirk)S 127 x(at)S 128 x(you.)S 210 x
(T)S -46 x(o)S 128 x(help)S 128 x(you)S 128 x(avoid)S 128 x(this,)S
136 x(here')S -18 x(s)S 127 x(the)S 128 x(Decoder)S 127 x(Ring:)S
897 y 5991 X(The)S 177 x("10")S 175 x(refers)S 176 x(to)S 176 x
(Ethernet')S -18 x(s)S 175 x(10)S 176 x(Mb)S 177 x(bandwidth.)S 251 x
(The)S 177 x("2")S 176 x(or)S 176 x("5")S 175 x(refers)S 176 x(to)S
597 y 5991 X(the)S 162 x(approximate)S 162 x(maximum)S 163 x(cable)S
162 x(length;)S 165 x(200)S 161 x(Meters)S 162 x(\(185\))S 162 x
(for)S 162 x(Thinwire,)S 598 y 5991 X(500)S 166 x(Meters)S 166 x
(for)S 166 x(Thickwire.)S 223 x(So:)S 897 y 5991 X(10base5)S 166 x
(is)S 165 x(Standard,)S 167 x(Thickwire)S 166 x(Ethernet.)S 896 y
5991 X(10base2)S 166 x(is)S 165 x(Thinwire)S 167 x(Ethernet.)S 29901 Y
16881 X F152(Ethernet)S 167 x(for)S 167 x(Idiots)S 498 x(1\20315)S
PP
EP
%%DOC$Page: 2-1 23
1000 BP 39600 30600 PM 0 0 XY
10574 Y 4796 X F20(Chapte)S -2 x(r)S 897 x(2)S 349 y 4796 X
17928 24 R 11922 Y 4796 X(Linking)S 298 x(Ethern)S -2 x(et)S 298 x
(Segments)S 14015 Y 4796 X F24(2.1)S 348 x(Overvie)S -2 x(w)S 15808 Y
5991 X F151(There)S 167 x(are)S 166 x(3)S 166 x(ways)S 166 x(to)S
166 x(link)S 166 x(Ethernet)S 167 x(segments)S 166 x(together)S 166 x
("T)S -30 x(ransparently":)S 897 y 5991 X(\201)S 595 x(W)S -19 x
(ith)S 166 x(a)S 166 x(coaxial)S 167 x(barrel)S 166 x(connector)S
-36 x(.)S 896 y 5991 X(\201)S 595 x(W)S -19 x(ith)S 166 x(an)S 166 x
(Ethernet)S 167 x(repeater)S -37 x(,)S 166 x(such)S 167 x(as)S 166 x
(the)S 166 x(DERE)S -2 x(P)S -64 x(.)S 897 y 5991 X(\201)S 595 x(W)S
-19 x(ith)S 225 x(a)S 226 x(Bridge,)S 241 x(such)S 226 x(as)S 225 x
(the)S 226 x(LAN)S 225 x(Bridge)S 226 x(100)S 226 x(\(DEB)S -2 x
(ET\))S 226 x(or)S 225 x(V)S -22 x(italink)S 598 y 6888 X(T)S -31 x
(ranslan.)S 20889 Y 5991 X(All)S 159 x(three)S 160 x(perform)S 160 x
(the)S 160 x(same)S 159 x(basic)S 159 x(function-)S 161 x(They)S
161 x(extend)S 160 x(the)S 160 x(LAN,)S 160 x(allow-)S 598 y 5991 X
(ing)S 229 x(resources)S 229 x(\(V)S -55 x(AXen,)S 244 x
(DECservers,)S 244 x(workstations\))S 228 x(to)S 228 x(be)S 229 x
(shared)S 229 x(over)S 229 x(a)S 597 y 5991 X(larger)S 216 x(area.)S
371 x(What)S 215 x(follows)S 215 x(is)S 215 x(a)S 215 x(discussion)S
215 x(of)S 216 x(how)S 215 x(the)S 216 x(three)S 216 x(differ)S -37 x
(,)S 228 x(and)S 598 y 5991 X(what)S 166 x(con\211gu)S 2 x(ration)S
166 x(options/features)S 166 x(are)S 166 x(available)S 166 x(with)S
166 x(each.)S 23878 Y 4796 X F28(2.1.1)S 300 x(Barrel)S 199 x
(connecto)S 2 x(rs)S 25671 Y 5991 X F151(The)S 142 x(coaxial)S 142 x
(barrel)S 142 x(connector)S 143 x(is)S 141 x(a)S 141 x
(electronically)S 143 x(passive)S 141 x(coupler)S -8 x(-)S 141 x(It)S
141 x(splices)S 598 y 5991 X(together)S 218 x(two)S 217 x(coax)S
219 x(segment)S 217 x(ends,)S 231 x(forming)S 218 x(a)S 218 x
(longer)S 219 x(segment.)S 376 x(The)S 218 x(only)S 597 y 5991 X
(advantages)S 167 x(of)S 166 x(the)S 166 x(barrel)S 166 x(connector)S
167 x(are)S 167 x(price)S 166 x(and)S 166 x(ease)S 166 x(of)S 166 x
(installation.)S 29901 Y 15110 X F152(Linking)S 167 x(Ethernet)S
167 x(Segmen)S 2 x(ts)S 498 x(2\2031)S
PP
EP
%%DOC$Page: 2-2 24
1000 BP 39600 30600 PM 0 0 XY
3960 Y 5991 X F36(Figu)S 2 x(re)S 165 x(2\2031:)S 498 x(Barrel)S
166 x(connector)S 167 x(example)S 5020 Y 5991 X F98(Key:)S 797 y
5991 X(=====)S 807 x(Ethernet)S 269 x(Coaxial)S 269 x(Cable)S 498 y
5991 X(+++)S 8143 X(H4000)S 269 x(Tranceiver)S 499 y 5991 X(#)S
8143 X(50)S 269 x(Ohm)S 269 x(Ethernet)S 269 x(Terminator)S 8507 Y
6798 X(VAX)S 269 x(A)S 11640 X(VAX)S 269 x(B)S 18365 X(VAX)S 269 x
(C)S 22937 X(VAX)S 269 x(D)S 498 y 6798 X(-----)S 11640 X(-----)S
18365 X(-----)S 22937 X(-----)S 499 y 7336 X(|)S 12178 X(|)S 18903 X
(|)S 23475 X(|)S 498 y 7336 X(|)S 12178 X(|)S 15675 X(__)S 18903 X
(|)S 23475 X(|)S 498 y 5991 X
(#===+++===============+++===========__=========+++==============+++=)S
(=========#)S 498 y 8412 X(Segment)S 269 x(A)S 20248 X(Segment)S
268 x(B)S 498 y 5991 X(^)S 7336 X(^)S 12178 X(^)S 15675 X(^)S 18903 X
(^)S 23475 X(^)S 26703 X(^)S 498 y 5991 X(|)S 7336 X(|)S 12178 X(|)S
15675 X(|)S 18903 X(|)S 23475 X(|)S 26703 X(|)S 498 y 5991 X(|)S
7336 X(H4000)S 12178 X(H4000)S 15675 X(|)S 18903 X(H4000)S 23475 X
(H4000)S 26703 X(|)S 498 y 5991 X(|)S 26703 X(|)S 499 y 5991 X(50)S
269 x(Ohm)S 269 x(Terminator)S 14330 X(Barrel)S 269 x(Connector)S
22130 X(50)S 269 x(Ohm)S 269 x(Terminator)S 15581 Y 5991 X F151(If)S
114 x(the)S 114 x(objective)S 115 x(is)S 113 x(to)S 114 x(connect)S
115 x(two)S 113 x(local)S 115 x(Ethernet)S 114 x(segments)S 114 x
(cheaply)S -55 x(,)S 125 x(a)S 114 x(barrel)S 598 y 5991 X
(connector)S 191 x(will)S 189 x(do)S 190 x(the)S 190 x(job.)S 294 x
(In)S 190 x(the)S 190 x(above)S 191 x(\211gure,)S 197 x(linking)S
192 x(segments)S 189 x(A)S 190 x(&)S 190 x(B)S 597 y 5991 X(with)S
115 x(the)S 116 x(barrel)S 116 x(connector)S 117 x(permits)S 115 x
(V)S -56 x(AX)S 115 x(A)S 115 x(and)S 116 x(B)S 116 x(to)S 115 x
(communicate)S 116 x(with)S 116 x(V)S -56 x(AX)S 598 y 5991 X(C)S
166 x(and)S 166 x(D.)S 166 x(The)S 167 x(segments)S 166 x(are)S 166 x
("Spliced")S 165 x(together)S -36 x(,)S 167 x(and)S 166 x(act)S 166 x
(as)S 166 x(one)S 166 x(segment.)S 19167 Y 5991 X(The)S 167 x
(disadvantages)S 166 x(of)S 166 x(the)S 166 x(barrel)S 166 x(connec)S
2 x(tor)S 166 x(are:)S 897 y 5991 X(\201)S 595 x(A)S 201 x("Splice")S
200 x(in)S 202 x(the)S 201 x(Ethernet)S 202 x(segment)S 201 x(will)S
201 x(cause)S 202 x(a)S 201 x("re\212ection",)S 211 x(which)S 598 y
6888 X(can)S 307 x(cause)S 307 x(data)S 306 x(loss)S 307 x(on)S 307 x
(the)S 307 x(segment.)S 644 x(These)S 308 x(re\212ections)S 307 x
(can)S 307 x(be)S 597 y 6888 X(minimized)S 215 x(by)S 216 x
(assuring)S 216 x(that)S 215 x(all)S 216 x(cable)S 215 x(lengths)S
217 x(are)S 215 x(cut)S 216 x(in)S 216 x(lengths)S 216 x(of)S 598 y
6888 X(23.4,)S 206 x(70.2,)S 206 x(or)S 198 x(1)S -28 x(17)S 197 x
(Meters.)S 316 x(For)S 198 x(a)S 198 x(technical)S 198 x
(explanation)S 198 x(of)S 197 x(the)S 198 x(W)S -37 x(ave)S 598 y
6888 X(Re\212ection)S 164 x(phenomenon)S 2 x(,)S 165 x(see)S 164 x
(section)S 164 x(7.6.1)S 165 x(of)S 164 x(the)S 164 x(Ethernet)S
164 x(Spec,)S 165 x(DEC)S 598 y 6888 X(STD)S 165 x(134.)S 896 y
5991 X(\201)S 595 x(The)S 174 x(cables)S 173 x(being)S 175 x(joined)S
174 x(should)S 174 x(be)S 174 x(from)S 173 x(the)S 174 x(same)S 173 x
(Manufacturer)S 175 x(and)S 598 y 6888 X(Lot)S 166 x(number)S -36 x
(,)S 166 x(to)S 166 x(assure)S 166 x(electrical/physical)S 167 x
(compatability)S -56 x(.)S 897 y 5991 X(\201)S 595 x(Since)S 191 x
(we)S 190 x(now)S 191 x(have)S 192 x("one)S 191 x(segment",)S 197 x
(we)S 190 x(must)S 191 x(adhere)S 191 x(to)S 191 x(the)S 191 x
(ethernet)S 598 y 6888 X(guidelines)S 166 x(for)S 167 x(segment)S
166 x(length-)S 167 x(500)S 166 x(Meters)S 166 x(maximum)S 166 x
(length.)S 896 y 5991 X(\201)S 595 x(W)S -28 x(e)S 177 x(can)S 178 x
(only)S 178 x(have)S 178 x(100)S 177 x(T)S -31 x(ranceiver)S 2 x(s)S
176 x(per)S 178 x(segment.)S 255 x(So)S 177 x(unless)S 177 x(DELNI')S
-19 x(s)S 598 y 6888 X(\(or)S 160 x(other)S 161 x(multiport)S 160 x
(repeaters\))S 159 x(are)S 161 x(used,)S 162 x(we)S 160 x(are)S 160 x
(limited)S 159 x(to)S 161 x(100)S 160 x(Nodes)S 598 y 6888 X(\(V)S
-56 x(AXen,)S 166 x(DECservers\))S 165 x(on)S 167 x(our)S 166 x
(linked)S 167 x(segment.)S 29901 Y 4796 X F152(2\2032)S 498 x
(Linking)S 167 x(Ethernet)S 167 x(Segmen)S 2 x(ts)S
PP
EP
%%DOC$Page: 2-3 25
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(\201)S 595 x(Since)S 134 x(the)S 133 x(barrel)S
134 x(is)S 133 x(passive,)S 140 x(a)S 134 x(cable)S 133 x(fault)S
134 x(on)S 134 x(one)S 134 x(segment)S 134 x(\(open,)S 140 x
(short\))S 598 y 6888 X(will)S 165 x(affect)S 166 x(both)S 166 x
(cable)S 166 x(segments.)S 5763 Y 4796 X F28(2.1.2)S 300 x
(Repeaters)S 7556 Y 5991 X F151(The)S 139 x(repeater)S 138 x(is)S
138 x(an)S 138 x(electronically)S 140 x(ACTIVE)S 136 x(device,)S
145 x(which)S 139 x(sits)S 137 x(between)S 138 x(two)S 598 y 5991 X
(Ethernet)S 156 x(cable)S 156 x(segments,)S 159 x(and)S 156 x
(connects)S 157 x(to)S 156 x(each)S 156 x(segment)S 157 x(via)S 156 x
(a)S 156 x(tranceiver)S 597 y 5991 X(cable)S 191 x(and)S 192 x(T)S
-31 x(ranceiv)S 2 x(er)S 191 x(\(H4000-AA\).)S 191 x(The)S 192 x
(DERE)S -2 x(P)S 192 x(has)S 191 x(NO)S 191 x(MEMOR)S -19 x(Y)S -56 x
(,)S 192 x(and)S 598 y 5991 X(repeats)S 162 x(everyth)S 2 x(ing)S
163 x(heard)S 163 x(through)S 164 x(its)S 162 x(tranceiver)S 164 x
(on)S 163 x(one)S 163 x(segment)S 163 x(IMME-)S 598 y 5991 X(DIA)S
-28 x(TEL)S -46 x(Y)S 158 x(onto)S 158 x(the)S 158 x(other)S 159 x
(segment.)S 219 x(It)S 158 x(does)S 158 x(not)S 158 x(look)S 158 x
(at)S 158 x(the)S 159 x(data)S 157 x(\(Packets\))S 598 y 5991 X
(which)S 221 x(it)S 221 x(forwards)S 220 x(between)S 221 x
(segments-)S 221 x(It)S 220 x(has)S 221 x(NO)S 220 x(intelligence.)S
388 x(But)S 220 x(be-)S 597 y 5991 X(cause)S 204 x(the)S 205 x
(repeater)S 204 x(re-ampli\211es)S 204 x(the)S 205 x(signal)S 204 x
(between)S 204 x(cable)S 205 x(segments,)S 214 x(we)S 598 y 5991 X
(can)S 167 x(join)S 166 x(up)S 167 x(to)S 166 x(three)S 166 x(500)S
166 x(Meter)S 166 x(segents)S 166 x(by)S 167 x(using)S 167 x
(repeaters.)S 897 y 5991 X(On)S 266 x(the)S 266 x(Ethernet)S 266 x
(we)S 266 x(have)S 267 x(a)S 266 x(total)S 265 x(maximum)S 266 x
(packet)S 266 x(round-trip)S 267 x(delay)S 598 y 5991 X(budget)S
123 x(of)S 123 x(46.38)S 123 x(microseconds)S 123 x(between)S 123 x
(any)S 124 x(2)S 122 x(nodes.)S 208 x(The)S 124 x(DER)S -2 x(EP)S
123 x(repeater)S 597 y 5991 X(contributes)S 206 x(less)S 204 x(than)S
206 x(1)S 205 x(microsecond)S 206 x(of)S 205 x(delay)S 206 x(to)S
205 x(the)S 206 x(packet')S -19 x(s)S 205 x(travel.)S 340 x(In)S
598 y 5991 X(short,)S 167 x(the)S 166 x(DERE)S -2 x(P)S 167 x(is)S
165 x(a)S 166 x(very)S 167 x(fast,)S 166 x(but)S 166 x(stupid,)S
166 x(packet)S 167 x(relay)S 166 x(station.)S 29901 Y 15110 X F152
(Linking)S 167 x(Ethernet)S 167 x(Segmen)S 2 x(ts)S 498 x(2\2033)S
PP
EP
%%DOC$Page: 2-4 26
1000 BP 39600 30600 PM 0 0 XY
3975 Y 5991 X F36(Figu)S 2 x(re)S 165 x(2\2032:)S 498 x(Example)S
167 x(of)S 166 x(joi)S 2 x(ning)S 167 x(Ethernet)S 167 x(Segments)S
166 x(with)S 167 x(Repeaters)S 5353 Y 7336 X F98(VAX)S 269 x(A)S
12985 X(VAX)S 269 x(B)S 19710 X(DECserver)S 498 y 7336 X(-----)S
12985 X(-----)S 20248 X(-----)S 499 y 7874 X(|)S 13523 X(|)S 20786 X
(|)S 498 y 7874 X(|)S 13523 X(|)S 20786 X(|)S 498 y 5991 X
(#=====+++==================+++===========+++==========+++=========#)S
498 y 17289 X(|)S 498 y -269 x(|)S 498 y 16213 X(DEREP-AA)S 498 y
17289 X(|)S 498 y -269 x(|)S 499 y 8412 X
(#=======+++==========+++========+++==============+++===========+++==)S
(=#)S 498 y 10833 X(|)S 14330 X(|)S 21862 X(|)S 25627 X(|)S 498 y
10833 X(|)S 14330 X(|)S 21862 X(|)S 25627 X(|)S 498 y 10295 X(-----)S
13523 X(DEREP-RA)S 21324 X(-----)S 25089 X(-----)S 498 y 10295 X
(VAX)S 269 x(C)S 13792 X(|)S 807 x(|)S 21324 X(VAX)S 268 x(D)S 24551 X
(DECserver)S 498 y 13792 X(|)S 807 x(|)S 538 x(\\)S 498 y 13792 X(|)S
807 x(|)S 807 x(|)S 269 x(Fiber)S 269 x(Optic)S 269 x(links,)S 269 x
(max)S 268 x(1000)S 269 x(Meters)S 499 y 13792 X(|)S 807 x(|)S 538 x
(/)S 498 y 13792 X(|)S 807 x(|)S 498 y 13523 X(DEREP-RA)S 538 x(or)S
269 x(DEBET-RC)S 498 y 14330 X(|)S 498 y -269 x(|)S 498 y 7336 X
(#=========+++============+++==========+++================+++========)S
(=#)S 498 y 10295 X(|)S 17827 X(|)S 22937 X(|)S 498 y 10295 X(|)S
17827 X(|)S 22937 X(|)S 499 y 9757 X(-----)S 17289 X(-----)S 22399 X
(-----)S 498 y 9488 X(Node)S 269 x("N")S 17020 X(Node)S 269 x("N+1")S
22130 X(Node)S 269 x("N+2")S 19500 Y 5991 X F151(Advantages:)S 897 y
5991 X(\201)S 595 x(W)S -28 x(e)S 261 x(can)S 261 x(link)S 262 x
(together)S 262 x(up)S 261 x(to)S 261 x(3)S 261 x(500)S 260 x(Meter)S
262 x(cable)S 261 x(segments,)S 285 x(with)S 260 x(a)S 598 y 6888 X
(maximum)S 213 x(of)S 213 x(2)S 213 x(DEREP')S -20 x(s)S 213 x
(between)S 213 x(any)S 213 x(two)S 213 x(nodes)S 213 x(on)S 214 x
(the)S 213 x(LAN)S 213 x(\(The)S 597 y 6888 X(infamous)S 166 x("2)S
166 x(repeater)S 166 x(rule".\))S 897 y 5991 X(\201)S 595 x(W)S -28 x
(e)S 135 x(could)S 136 x(run)S 137 x(multiple)S 135 x(repeaters)S
135 x(from)S 135 x(a)S 136 x(single)S 136 x(cable)S 135 x(segment,)S
142 x(as)S 135 x(long)S 598 y 6888 X(as)S 197 x(we)S 197 x(observe)S
197 x(all)S 198 x(Ethernet)S 197 x(con\211g)S 2 x(uration)S 198 x
(guidelines)S 198 x(as)S 197 x(documented)S 598 y 6888 X(in)S 134 x
(the)S 134 x(DEC)S -2 x(connec)S 2 x(t)S 133 x(Planning)S 135 x(and)S
134 x(Con\211gu)S 2 x(ration)S 134 x(guide,)S 141 x(and)S 134 x(DEC)S
133 x(STD)S 597 y 6888 X(134)S 130 x(\(Max)S 131 x(segment)S 130 x
(length)S 132 x(500)S 130 x(Meters,)S 138 x(Max)S 131 x(distance)S
130 x(between)S 130 x(any)S 131 x(two)S 598 y 6888 X(nodes)S 166 x
(2800)S 166 x(Meters,)S 166 x(incl.)S 222 x(Fiber)S -36 x(.\))S 897 y
5991 X(\201)S 595 x(Since)S 170 x(the)S 171 x(DERE)S -2 x(P)S 171 x
(is)S 170 x(linked)S 170 x(to)S 171 x(the)S 170 x(cable)S 170 x
(segment)S 171 x(with)S 170 x(an)S 170 x(H4000-AA)S 597 y 6888 X
(tranceiver)S -36 x(,)S 240 x(a)S 225 x(cable)S 225 x(short)S 225 x
(or)S 225 x(open)S 225 x(will)S 224 x(remain)S 225 x(local)S 225 x
(to)S 225 x(only)S 225 x(1)S 225 x(cable)S 598 y 6888 X(segment-)S
166 x(the)S 166 x(DEREP)S 165 x(will)S 165 x(isolate)S 166 x(the)S
166 x(remaining)S 167 x(good)S 167 x(segment\(s\).)S 29901 Y 4796 X
F152(2\2034)S 498 x(Linking)S 167 x(Ethernet)S 167 x(Segmen)S 2 x
(ts)S
PP
EP
%%DOC$Page: 2-5 27
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(\201)S 595 x(If)S 124 x(a)S 125 x(repeater)S 126 x
(in)S 125 x("Standby")S 125 x(mode)S 125 x(is)S 125 x(con\211gur)S
2 x(ed)S 125 x(in)S 125 x(parallel)S 125 x(with)S 125 x(another)S
598 y 6888 X(repeater)S -37 x(,)S 186 x(it)S 181 x(will)S 181 x
(detect)S 181 x(a)S 181 x(loop,)S 186 x(and)S 182 x(will)S 181 x(go)S
182 x(into)S 181 x(a)S 182 x("Standby")S 181 x(state.)S 268 x(If)S
598 y 6888 X(the)S 213 x(standby)S 213 x(repeater)S 213 x(detects)S
212 x(that)S 213 x(the)S 213 x(primary)S 214 x(path)S 213 x(has)S
212 x(broken,)S 227 x(it)S 598 y 6888 X(will)S 206 x(come)S 208 x
(out)S 208 x(of)S 207 x(standby)S -55 x(,)S 218 x(and)S 208 x(begin)S
208 x(forwarding)S 208 x(packets.)S 347 x(Having)S 208 x(a)S 597 y
6888 X(redundant)S 138 x(repeater)S 138 x(in)S 137 x("Hot)S 137 x
(Standby")S 138 x(assures)S 137 x(minimum)S 137 x(LAN)S 137 x
(disrup-)S 598 y 6888 X(tion)S 166 x(in)S 166 x(the)S 166 x(event)S
167 x(of)S 166 x(a)S 166 x(repeater)S 166 x(failure.)S 897 y 5991 X
(\201)S 595 x(The)S 229 x(Fiber)S -9 x(-optic)S 229 x(DERE)S -2 x
(P-RA)S 228 x(can)S 230 x(be)S 228 x(used)S 229 x(to)S 229 x
(electrically)S 229 x(isolate)S 228 x(two)S 598 y 6888 X(cable)S
208 x(segments,)S 220 x(and)S 209 x(to)S 209 x(span)S 208 x
(distances)S 209 x(up)S 209 x(to)S 208 x(1000)S 209 x(Meters)S 209 x
(\(such)S 209 x(as)S 597 y 6888 X(between)S 166 x(buildings.\))S
897 y 5991 X(Disadvantages:)S 897 y 5991 X(\201)S 595 x(A)S 200 x
(repeater)S 202 x(passes)S 200 x(data)S 201 x(transparently-)S 201 x
(a)S 202 x(bad)S 201 x(packet)S 201 x(\(Bad)S 201 x(CRC,)S 200 x
(too)S 597 y 6888 X(long,)S 172 x(too)S 170 x(short,)S 172 x
(babbling)S 170 x(DEQNA)S 168 x(in)S 171 x(a)S 170 x(UV)S -56 x
(AXII\))S 169 x(will)S 169 x(be)S 170 x(passed)S 169 x(along)S 598 y
6888 X(to)S 166 x(ALL)S 166 x(cable)S 166 x(segments)S 166 x(in)S
166 x(the)S 166 x(LAN.)S 897 y 5991 X(\201)S 595 x(No)S 272 x
(packet)S 273 x(\211ltering)S 274 x(is)S 272 x(performed-)S 273 x
(if)S 273 x(a)S 272 x(packet)S 273 x(only)S 274 x(needs)S 273 x(to)S
272 x(pass)S 597 y 6888 X(between)S 157 x(two)S 157 x(nodes)S 158 x
(on)S 158 x(the)S 158 x(same)S 157 x(Ethernet)S 158 x(segment,)S
160 x(the)S 158 x(repeater)S 158 x(will)S 598 y 6888 X(still)S 203 x
("Flood")S 203 x(the)S 205 x(packet)S 204 x(onto)S 204 x(all)S 204 x
(segments,)S 213 x(increasing)S 205 x(traf\211c)S 205 x(on)S 204 x
(the)S 598 y 6888 X(entire)S 166 x(Ethernet.)S 15925 Y 4796 X F36
(2.1.2.1)S 250 x(Multipo)S 2 x(rt)S 165 x(Repeaters)S 17718 Y 5991 X
F151(The)S 220 x(multiport)S 219 x(repeater)S 220 x(does)S 219 x
(just)S 219 x(what)S 219 x(it')S -19 x(s)S 219 x(name)S 220 x
(suggests.)S 381 x(It)S 219 x(Repeats)S 598 y 5991 X(traf\211c)S
169 x(from)S 168 x(one)S 169 x(segment)S 169 x(onto)S 168 x
(multiple)S 169 x(segments.)S 228 x(At)S 168 x(this)S 168 x(time,)S
169 x(our)S 169 x(only)S 597 y 5991 X(implementation)S 138 x(of)S
139 x(this)S 138 x(is)S 138 x(the)S 139 x(DEMPR,)S 139 x(which)S
139 x(repeats)S 138 x(signals)S 139 x(between)S 138 x(up)S 598 y
5991 X(to)S 147 x(8)S 146 x(Thinwire)S 147 x(segments)S 147 x(and)S
147 x(1)S 146 x(Thickwire)S 148 x(segment.)S 215 x(The)S 148 x
(DEMPR)S 146 x(can)S 147 x(also)S 598 y 5991 X(be)S 183 x(used)S
183 x(in)S 183 x(a)S 183 x("Standalone")S 183 x(mode,)S 187 x(to)S
183 x(provide)S 183 x(a)S 183 x("star")S 182 x(hub)S 184 x(for)S
183 x(the)S 183 x(linking)S 598 y 5991 X(of)S 166 x(up)S 166 x(to)S
166 x(8)S 166 x(Thinwire)S 167 x(segments,)S 166 x(without)S 166 x
(a)S 166 x(Thickwire)S 167 x(segment)S 166 x(present.)S 22500 Y
5991 X(Another)S 234 x(device)S 235 x(we)S 234 x(should)S 234 x
(touch)S 235 x(on)S 234 x(is)S 234 x(the)S 234 x(DELNI.)S 234 x(The)S
234 x(DELNI)S 233 x(has)S 234 x(8)S 598 y 5991 X("Local")S 130 x
(ports)S 130 x(to)S 130 x(which)S 130 x(nodes)S 131 x(can)S 130 x
(attach,)S 138 x(and)S 131 x(1)S 130 x("Global")S 129 x(port)S 130 x
(which)S 131 x(can)S 130 x(be)S 597 y 5991 X(attached)S 179 x(to)S
180 x(an)S 180 x(Ethernet)S 179 x(segment.)S 263 x(If)S 179 x(no)S
180 x(Global)S 178 x(segment)S 180 x(is)S 179 x(used)S 179 x(on)S
180 x(port)S 598 y 5991 X(9,)S 253 x(the)S 235 x(DELNI)S 235 x
(provides)S 235 x(a)S 235 x(self-contained)S 235 x("Standalone)S
236 x(segment")S 235 x(for)S 235 x(the)S 598 y 5991 X(attachment)S
175 x(of)S 176 x(up)S 175 x(to)S 176 x(8)S 175 x(Nodes.)S 250 x(The)S
176 x(cost)S 175 x(of)S 175 x(a)S 175 x(DELNI)S 175 x(is)S 175 x
(substantially)S 175 x(less)S 598 y 5991 X(than)S 135 x(the)S 134 x
(cost)S 134 x(of)S 134 x(8)S 134 x(H4000')S -19 x(s,)S 140 x(so)S
134 x(if)S 134 x(a)S 134 x(site)S 133 x(has)S 134 x(8)S 134 x(or)S
135 x(fewer)S 133 x(nodes)S 134 x(located)S 134 x(within)S 597 y
5991 X(100)S 148 x(Meters)S 149 x(of)S 148 x(each)S 149 x(other)S
-36 x(,)S 152 x(the)S 149 x(DELNI)S 147 x(might)S 149 x(be)S 148 x
(used.)S 216 x(At)S 148 x(a)S 149 x(later)S 148 x(date,)S 152 x(the)S
598 y 5991 X(Global)S 231 x(port)S 232 x(can)S 232 x(be)S 232 x
(attached)S 232 x(to)S 231 x(a)S 232 x(Backbone)S 233 x(to)S 231 x
(provide)S 232 x(communication)S 598 y 5991 X(with)S 166 x(other)S
166 x(nodes.)S 29901 Y 15110 X F152(Linking)S 167 x(Ethernet)S 167 x
(Segmen)S 2 x(ts)S 498 x(2\2035)S
PP
EP
%%DOC$Page: 2-6 28
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(One)S 125 x(consideration:)S 202 x(If)S 125 x(a)S
126 x(DEMPR)S 124 x(is)S 125 x(attached)S 126 x(to)S 125 x(a)S 125 x
(DELNI,)S 126 x(then)S 125 x(the)S 126 x(DELNI)S 598 y 5991 X(must)S
226 x(either)S 226 x(be)S 227 x(in)S 226 x("Global")S 225 x(mode)S
226 x(with)S 226 x(a)S 226 x(loopback)S 227 x(connector)S 227 x(in)S
227 x(port)S 226 x(9,)S 598 y 5991 X(or)S 269 x(connected)S 270 x
(to)S 269 x(a)S 269 x(segment)S 269 x(via)S 269 x(a)S 269 x
("Heartbeatless")S 268 x(tranceiver)S -36 x(,)S 295 x(such)S 270 x
(as)S 598 y 5991 X(the)S 206 x(H4000-BA)S 204 x(or)S 205 x(H4005)S
206 x(w/Heartbeat)S 205 x(disabled.)S 339 x(For)S 206 x(more)S 205 x
(info,)S 216 x(see)S 205 x(the)S 597 y 5991 X(DECconnect)S 166 x
(guide.)S 29901 Y 4796 X F152(2\2036)S 498 x(Linking)S 167 x
(Ethernet)S 167 x(Segmen)S 2 x(ts)S
PP
EP
%%DOC$Page: 2-7 29
1000 BP 39600 30600 PM 0 0 XY
4032 Y 4796 X F28(2.1.3)S 300 x(Bridges)S 5825 Y 5991 X F151(And)S
166 x(now)S -46 x(,)S 167 x(the)S 166 x(Hero)S 166 x(of)S 166 x(our)S
167 x(story-)S 166 x(The)S 167 x(Ethernet)S 166 x(bridge.)S 7020 Y
4796 X F36(2.1.3.1)S 250 x(LAN)S 166 x(Bridge)S 166 x(100)S 166 x
(in)S 167 x(a)S 166 x(Nutshell)S 8814 Y 5991 X F151(A)S 294 x
(bridge)S 296 x(performs)S 294 x(the)S 295 x(same)S 294 x(basic)S
295 x(function)S 295 x(as)S 294 x(a)S 295 x(repeater)S 295 x(or)S
295 x(barrel)S 597 y 5991 X(connector)S -8 x(-)S 217 x(It)S 216 x
(moves)S 216 x(packets)S 216 x(from)S 217 x(one)S 217 x(side)S 216 x
(to)S 216 x(the)S 217 x(other)S -37 x(.)S 373 x(It)S 216 x(is)S 216 x
(SMART)S -46 x(,)S 598 y 5991 X(however)S -36 x(.)S 313 x(If)S 196 x
(a)S 196 x(packet)S 197 x(is)S 196 x(sent)S 196 x(between)S 196 x
(two)S 196 x(nodes)S 196 x(which)S 197 x(are)S 197 x(both)S 196 x
(on)S 197 x(the)S 598 y 5991 X(same)S 239 x(side)S 239 x(of)S 240 x
(the)S 239 x(bridge)S 240 x(\(both)S 240 x(on)S 240 x(port)S 239 x
(A)S 239 x(or)S 240 x(both)S 240 x(on)S 240 x(port)S 239 x(B)S 239 x
(side\),)S 258 x(the)S 598 y 5991 X(bridge)S 225 x(will)S 223 x(not)S
225 x(forward)S 224 x(the)S 225 x(packet)S 224 x(to)S 224 x(the)S
225 x(other)S 225 x(side,)S 238 x(cutting)S 226 x(down)S 224 x(on)S
597 y 5991 X(unecessary)S 245 x(traf\211c.)S 455 x(If)S 244 x(a)S
243 x(packet)S 245 x(is)S 243 x(sent)S 243 x(from)S 244 x(a)S 244 x
(node)S 244 x(on)S 244 x(one)S 245 x(side)S 243 x(\(say)S -55 x(,)S
598 y 5991 X(the)S 186 x(port)S 186 x(A)S 186 x(segment\))S 186 x
(to)S 186 x(a)S 186 x(node)S 186 x(on)S 187 x(the)S 186 x(other)S
187 x(side)S 185 x(\(on)S 186 x(port)S 186 x(B\),)S 186 x(the)S 187 x
(bridge)S 598 y 5991 X(FOR)S -19 x(W)S -46 x(ARDS)S 165 x(the)S 166 x
(packet)S 166 x(from)S 166 x(the)S 166 x(A)S 166 x(side)S 166 x(to)S
166 x(the)S 166 x(B)S 166 x(side.)S 14791 Y 5991 X(A)S 215 x(bridge)S
216 x(is)S 216 x(a)S 215 x("Store)S 216 x(and)S 215 x(Forward")S
216 x(device.)S 371 x(This)S 216 x(means)S 216 x(that)S 215 x(when)S
216 x(the)S 598 y 5991 X(bridge)S 216 x(receives)S 215 x(a)S 215 x
(packet)S 215 x(on)S 216 x(one)S 215 x(side,)S 228 x(he)S 215 x
(stores)S 215 x(the)S 215 x(packet)S 215 x(in)S 215 x(his)S 215 x
(local)S 598 y 5991 X(memory)S 262 x(where)S 262 x(he)S 262 x(can)S
262 x(examine)S 263 x(the)S 262 x(packet,)S 286 x(and)S 262 x(make)S
262 x(an)S 262 x(intelligent)S 598 y 5991 X(decision)S 222 x
(whether)S 222 x(or)S 222 x(not)S 222 x(to)S 221 x(forward)S 222 x
(the)S 221 x(packet)S 222 x(to)S 222 x(the)S 222 x(other)S 222 x
(side.)S 388 x(If)S 222 x(it)S 597 y 5991 X(is)S 167 x(necessary)S
167 x(to)S 167 x(FOR)S -19 x(W)S -46 x(ARD)S 166 x(the)S 167 x
(packet)S 168 x(to)S 166 x(the)S 168 x(other)S 167 x(side,)S 168 x
(the)S 167 x(packet)S 167 x(\(and)S 598 y 5991 X(any)S 222 x(others)S
221 x(which)S 221 x(might)S 221 x(come)S 221 x(in)S 221 x(in)S 222 x
(the)S 221 x(meantime\))S 220 x(is)S 221 x(STORED)S 219 x(in)S 221 x
(the)S 598 y 5991 X(LB100')S -19 x(s)S 191 x(memory)S 192 x(while)S
191 x(the)S 192 x(LB100)S 191 x(listens)S 191 x(and)S 191 x
(contends)S 192 x(for)S 192 x(the)S 191 x(right)S 192 x(to)S 598 y
5991 X(transmit)S 165 x(on)S 167 x(the)S 166 x(B)S 166 x(segment)S
166 x(\(just)S 166 x(like)S 167 x(any)S 167 x(other)S 166 x(node)S
166 x(must.\))S 20769 Y 5991 X(A)S 223 x(bridge')S -18 x(s)S 224 x
(primary)S 224 x(advantage)S 225 x(over)S 224 x(a)S 224 x
(repeater/barrel)S 225 x(connector)S 225 x(is)S 223 x(that)S 598 y
5991 X(it)S 219 x(keeps)S 219 x(traf\211c)S 220 x(which)S 220 x(is)S
219 x(local)S 219 x(to)S 219 x(a)S 220 x(single)S 219 x(segment)S
220 x(from)S 219 x("Flooding")S 220 x(the)S 597 y 5991 X(Ethernet.)S
29901 Y 15110 X F152(Linking)S 167 x(Ethernet)S 167 x(Segmen)S 2 x
(ts)S 498 x(2\2037)S
PP
EP
%%DOC$Page: 2-8 30
1000 BP 39600 30600 PM 0 0 XY
3975 Y 4796 X F36(2.1.3.2)S 250 x(LAN)S 169 x(Bridge)S 169 x(100)S
169 x(in)S 170 x(a)S 169 x(Somewhat)S 169 x(larger)S 170 x
(Nutshell-)S 170 x(W)S -9 x(ell,)S 171 x(a)S 169 x(VER)S -18 x(Y)S
170 x(large)S 598 y 6568 X(nutshell)S 6083 Y 5991 X(Figu)S 2 x(re)S
165 x(2\2033:)S 498 x(Example)S 167 x(of)S 166 x(joi)S 2 x(ning)S
167 x(Ethernet)S 167 x(Segments)S 166 x(with)S 167 x(Bridges)S 7062 Y
7336 X F98(VAX)S 269 x(A)S 12985 X(VAX)S 269 x(B)S 19710 X
(DECserver)S 498 y 7336 X(-----)S 12985 X(-----)S 20248 X(-----)S
499 y 7874 X(|)S 13523 X(|)S 20786 X(|)S 498 y 7874 X(|)S 13523 X(|)S
20786 X(|)S 498 y 5991 X
(#=====+++==================+++===========+++==========+++=========#)S
537 x(Segment)S 269 x(1)S 498 y 17289 X(|)S 498 y -269 x(|)S 498 y
16482 X(port)S 269 x(A)S 498 y 16213 X(DEBET-AA)S 538 x(\(LAN)S 269 x
(Bridge)S 268 x(100)S 269 x(#1\))S 499 y 16482 X(port)S 269 x(B)S
498 y -807 x(|)S 498 y -269 x(|)S 498 y 5991 X(Segment)S 269 x(2)S
538 x
(#=====+++==========+++========+++==============+++===========+++===#)S
498 y 10833 X(|)S 14330 X(|)S 21862 X(|)S 25627 X(|)S 498 y 10833 X
(|)S 14330 X(|)S 21862 X(|)S 25627 X(|)S 498 y 10833 X(|)S 13792 X
(port)S 269 x(A)S 21862 X(|)S 25627 X(|)S 498 y 10833 X(|)S 12716 X
(DEBET-RC)S 269 x(\(LB100)S 269 x(#2\))S 21862 X(|)S 25627 X(|)S
499 y 10295 X(-----)S 13792 X(port)S 269 x(B)S 21324 X(-----)S 24551 X
(---------)S 498 y 10295 X(VAX)S 269 x(C)S 13792 X(|)S 807 x(|)S
21324 X(VAX)S 268 x(D)S 24551 X(DECserver)S 498 y 13792 X(|)S 807 x
(|)S 538 x(\\)S 498 y 13792 X(|)S 807 x(|)S 269 x(Fiber)S 269 x
(Optic)S 269 x(links,)S 269 x(max)S 269 x(1500)S 268 x(Meters)S 498 y
13792 X(|)S 807 x(|)S 538 x(/)S 498 y 13792 X(|)S 807 x(|)S 498 y
13792 X(port)S 269 x(A)S 499 y 13523 X(DEBET-RC)S 538 x(or)S 269 x
(DEREP-RA)S 498 y 13792 X(port)S 269 x(B)S 498 y 14330 X(|)S 498 y
-269 x(|)S 498 y 7336 X
(#=========+++============+++==========+++================+++==#)S
537 x(Segment)S 269 x(3)S 498 y 10295 X(|)S 17827 X(|)S 22937 X(|)S
498 y 10295 X(|)S 17827 X(|)S 22937 X(|)S 498 y 9757 X(-----)S 17289 X
(-----)S 22399 X(-----)S 499 y 9488 X(Node)S 269 x("N")S 17020 X
(Node)S 269 x("N+1")S 22130 X(Node)S 269 x("N+2")S 25095 Y 5991 X
F151(In)S 123 x(the)S 124 x(above)S 124 x(example,)S 132 x(if)S 123 x
(V)S -56 x(AX)S 123 x(A)S 123 x(sends)S 123 x(a)S 123 x(packet)S
123 x(to)S 123 x(V)S -55 x(AX)S 122 x(D,)S 123 x(Then)S 125 x(the)S
123 x(packet)S 598 y 5991 X(will)S 185 x(be)S 186 x(seen)S 186 x(on)S
186 x(port)S 185 x(A)S 186 x(by)S 186 x(LAN)S 186 x(bridge)S 186 x
(#1.)S 281 x(LAN)S 185 x(bridge)S 187 x(#1)S 185 x(knows)S 186 x
(\(Don')S -9 x(t)S 597 y 5991 X(ask)S 145 x(how)S -46 x(,)S 149 x
(we'll)S 144 x(get)S 145 x(to)S 144 x(that)S 144 x(later\))S 145 x
(that)S 144 x(V)S -55 x(AX)S 143 x(D)S 145 x(is)S 144 x(on)S 145 x
(his)S 144 x(other)S 145 x(side)S 144 x(\(Out)S 144 x(port)S 598 y
5991 X(2\),)S 166 x(so)S 166 x(He'll)S 166 x(forward)S 165 x(the)S
167 x(packet)S 166 x(to)S 166 x(Segment)S 166 x(2,)S 167 x(where)S
166 x(V)S -56 x(AX)S 166 x(D)S 165 x(receives)S 167 x(it.)S 29901 Y
4796 X F152(2\2038)S 498 x(Linking)S 167 x(Ethernet)S 167 x(Segmen)S
2 x(ts)S
PP
EP
%%DOC$Page: 2-9 31
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Similarly)S -55 x(,)S 199 x(When)S 192 x(LAN)S
192 x(bridge)S 193 x(#2)S 191 x(sees)S 192 x(the)S 192 x(packet)S
192 x(come)S 193 x(in)S 192 x(on)S 192 x(his)S 192 x(port)S 192 x
(A,)S 598 y 5991 X(he)S 181 x(knows)S 180 x(that)S 180 x(the)S 180 x
(node)S 180 x(the)S 181 x(packet)S 180 x(is)S 180 x(addressed)S 179 x
(to)S 180 x(is)S 180 x(ALSO)S 179 x(on)S 180 x(his)S 180 x(port)S
598 y 5991 X(A-)S 166 x(So)S 166 x(he)S 166 x(doesn')S -9 x(t)S 166 x
(forward)S 165 x(the)S 167 x(packet)S 166 x(to)S 166 x(port)S 166 x
(B.)S 6958 Y 5991 X(If)S 211 x(V)S -55 x(AX)S 211 x(D)S 211 x(now)S
212 x(sends)S 211 x(a)S 212 x(packet)S 212 x(to)S 211 x(V)S -55 x
(AX)S 211 x(C,)S 211 x(neither)S 213 x(LAN)S 211 x(Bridge)S 212 x
(100)S 212 x(will)S 598 y 5991 X(forward)S 287 x(the)S 287 x(packet)S
287 x(to)S 287 x(the)S 287 x(other)S 288 x(segments.)S 585 x(The)S
287 x(traf\211c)S 288 x(will)S 286 x(remain)S 598 y 5991 X(LOCAL)S
284 x(to)S 284 x(segment)S 285 x(2.)S 577 x(This)S 284 x
(intelligent)S 286 x("Filtering")S 284 x(of)S 285 x(packets)S 284 x
(keeps)S 597 y 5991 X(unnecessary)S 133 x(traf\211c)S 132 x(to)S
132 x(a)S 132 x(minimum)S 132 x(on)S 132 x(the)S 132 x(different)S
132 x(segments.)S 210 x(This)S 132 x(means)S 598 y 5991 X(that)S
165 x(while)S 166 x(V)S -56 x(AX)S 165 x(A)S 165 x(is)S 165 x
(transmitting)S 165 x(onto)S 166 x(segment)S 166 x(#1,)S 166 x(V)S
-56 x(AX)S 165 x(C)S 165 x(can)S 166 x(transmit)S 598 y 5991 X(onto)S
217 x(segment)S 216 x(#2,)S 229 x(and)S 217 x(Node)S 216 x("n")S
217 x(can)S 216 x(transmit)S 216 x(onto)S 217 x(segment)S 216 x(#3.)S
373 x(These)S 598 y 5991 X(simultaneous)S 164 x(transmissions)S 163 x
(onto)S 165 x(the)S 164 x(three)S 165 x(segments)S 164 x(will)S 164 x
(NOT)S 164 x(result)S 164 x(in)S 597 y 5991 X(collisions,)S 190 x
(since)S 185 x(the)S 185 x(LB100)S 185 x("Buffers")S 185 x(the)S
185 x(data)S 185 x(\(Store)S 185 x(and)S 185 x(Forward\).)S 279 x
(So,)S 598 y 5991 X(LB100')S -19 x(s)S 166 x(allow)S 165 x(us)S 166 x
(greater)S 167 x(utilization)S 165 x(of)S 166 x(the)S 167 x
(Ethernet')S -19 x(s)S 166 x(bandwidth.)S 13533 Y 5991 X(Other)S
166 x(features)S 166 x(of)S 166 x(the)S 166 x(Bridge:)S 897 y 5991 X
(\201)S 595 x(Only)S 178 x(good)S 179 x(packets)S 177 x(\(good)S
179 x(size,)S 181 x(good)S 178 x(FCS\))S 178 x(are)S 178 x
(forwarded)S 178 x(through)S 179 x(the)S 598 y 6888 X(bridge.)S 205 x
(If)S 115 x(a)S 116 x(node)S 116 x(is)S 115 x(babbling,)S 126 x(or)S
116 x(there)S 116 x(are)S 115 x(cable)S 116 x(problems,)S 126 x(the)S
115 x(problem)S 598 y 6888 X(is)S 165 x(isolated)S 166 x(to)S 165 x
(a)S 166 x(single)S 167 x(segment.)S 896 y 5991 X(\201)S 595 x
(Bridges)S 168 x(perform)S 168 x(Loop-detection.)S 228 x(If)S 167 x
(a)S 168 x(bridge)S 169 x(is)S 167 x(con\211g)S 2 x(ured)S 168 x(in)S
168 x(parallel)S 598 y 6888 X(with)S 266 x(another)S 268 x(bridge,)S
294 x(it)S 267 x(will)S 266 x(detect)S 267 x(the)S 267 x(loop,)S
293 x(and)S 268 x(one)S 267 x(bridge)S 268 x(will)S 598 y 6888 X(go)S
264 x(into)S 264 x(a)S 264 x("Backup")S 264 x(state.)S 515 x(If)S
264 x(the)S 264 x(backup)S 265 x(bridge)S 265 x(detects)S 263 x
(that)S 264 x(the)S 598 y 6888 X(primary)S 279 x(bridge)S 280 x(has)S
279 x(died,)S 308 x(it)S 279 x(will)S 278 x(come)S 280 x(out)S 279 x
(of)S 279 x(backup,)S 309 x(and)S 279 x(begin)S 597 y 6888 X
(forwarding)S 222 x(packets.)S 388 x(Having)S 222 x(a)S 222 x
(redundant)S 222 x(bridge)S 222 x(in)S 222 x("Hot)S 221 x(Standby")S
598 y 6888 X(assures)S 165 x(minimum)S 166 x(LAN)S 166 x(disruption)S
166 x(in)S 167 x(the)S 166 x(event)S 167 x(of)S 166 x(a)S 166 x
(bridge)S 166 x(failure.)S 897 y 5991 X(\201)S 595 x(Since)S 190 x
(the)S 191 x(bridge)S 191 x(has)S 190 x(local)S 191 x(memory)S -55 x
(,)S 197 x(he)S 191 x(isn')S -10 x(t)S 191 x(a)S 190 x(factor)S 191 x
(in)S 190 x(the)S 191 x(46.4)S 191 x(mi-)S 597 y 6888 X(crosecond)S
202 x(maximum)S 202 x(Ethernet)S 203 x(packet)S 202 x(propagation)S
203 x(delay)S -55 x(.)S 329 x(Segments)S 598 y 6888 X(which)S 250 x
(are)S 250 x(separated)S 250 x(by)S 250 x(bridges)S 251 x(may)S 250 x
(EACH)S 249 x(be)S 250 x(a)S 250 x(maximum)S 250 x(LAN)S 598 y 6888 X
(\(2800)S 164 x(meters,)S 164 x(if)S 164 x(Fiber)S -8 x(-optics)S
163 x(are)S 164 x(present.\))S 222 x(In)S 164 x(other)S 164 x
(words,)S 165 x(when)S 164 x(you)S 598 y 6888 X(go)S 218 x(through)S
219 x(a)S 218 x(bridge,)S 231 x(Ethernet)S 218 x(con\211g)S 2 x
(uration)S 218 x(limitations)S 217 x(start)S 217 x(over)S -36 x(.)S
598 y 6888 X(There)S 216 x(is,)S 227 x(however)S -36 x(,)S 227 x(a)S
215 x(maximum)S 216 x(of)S 214 x(7)S 215 x(LAN)S 215 x(Bridge)S 215 x
(100')S -19 x(s)S 215 x(allowed)S 214 x(be-)S 597 y 6888 X(tween)S
182 x(any)S 184 x(two)S 183 x(nodes)S 183 x(on)S 183 x(the)S 183 x
(LAN,)S 184 x(due)S 183 x(to)S 183 x(Delay)S 183 x(limitations)S
182 x(of)S 183 x(some)S 598 y 6888 X(protocols,)S 166 x(such)S 167 x
(as)S 165 x(LA)S -27 x(T)S -46 x(.)S 26385 Y 5991 X(Since)S 260 x
(the)S 260 x(bridge)S 261 x(is)S 259 x(an)S 260 x(intelligent)S 261 x
(device,)S 284 x(packet)S 260 x(\211ltering)S 261 x(is)S 260 x
(possible.)S 598 y 5991 X(Using)S 242 x(RBMS)S 240 x(\(Remote)S 241 x
(Bridge)S 242 x(Management)S 242 x(Software\),)S 260 x(the)S 242 x
(LB100)S 241 x(can)S 598 y 5991 X(be)S 204 x(instructed)S 204 x(to)S
204 x(make)S 204 x(decisions)S 204 x(about)S 204 x(packet)S 205 x
(disposit)S -2 x(ion)S 205 x(by)S 204 x(looking)S 206 x(at)S 598 y
5991 X(the)S 166 x("Destination")S 165 x(\211eld)S 167 x(of)S 166 x
(the)S 166 x(Ethernet)S 166 x(packet.)S 29901 Y 15110 X F152
(Linking)S 167 x(Ethernet)S 167 x(Segmen)S 2 x(ts)S 498 x(2\2039)S
PP
EP
%%DOC$Page: 2-10 32
1000 BP 39600 30600 PM 0 0 XY
3960 Y 5991 X F36(Figu)S 2 x(re)S 165 x(2\2034:)S 498 x(Example)S
167 x(of)S 166 x(\211lterin)S 2 x(g)S 166 x(packets)S 5368 Y 6798 X
F98(DECserver)S 269 x(#1)S 12985 X(DECserver)S 269 x(#2)S 20786 X
(DECserver)S 268 x(#3)S 498 y 6798 X(---------)S 12985 X(---------)S
20786 X(---------)S 498 y 7874 X(|)S 13523 X(|)S 20786 X(|)S 498 y
7874 X(|)S 13523 X(|)S 20786 X(|)S 498 y 5991 X
(#=====+++======+++=========+++===========+++==========+++=========#)S
537 x(Segment)S 269 x(1)S 499 y 10295 X(|)S 17289 X(|)S 498 y 10295 X
(|)S 17289 X(|)S 498 y 9757 X(-----)S 16482 X(port)S 269 x(A)S 498 y
9757 X(VAX)S 269 x(A)S 269 x(\(VMS\))S 16213 X(DEBET-AA)S 538 x
(\(LAN)S 269 x(Bridge)S 268 x(100)S 269 x(#1\))S 498 y 16482 X(port)S
269 x(B)S 498 y -807 x(|)S 498 y -269 x(|)S 498 y 5991 X(Segment)S
269 x(2)S 538 x
(#=====+++==========+++========+++==============+++===========+++===#)S
499 y 10833 X(|)S 14330 X(|)S 21862 X(|)S 25627 X(|)S 498 y 10833 X
(|)S 14330 X(|)S 21862 X(|)S 25627 X(|)S 498 y 10833 X(|)S 13792 X
(port)S 269 x(A)S 21862 X(|)S 25627 X(|)S 498 y 10833 X(|)S 12716 X
(DEBET-AA)S 269 x(\(LB100)S 269 x(#2\))S 21862 X(|)S 25627 X(|)S
498 y 10026 X(--------)S 13792 X(port)S 269 x(B)S 21055 X(-------)S
24282 X(-------)S 498 y 10026 X(UNIX)S 269 x(VAX)S 269 x(1)S 14330 X
(|)S 20517 X(SUN)S 269 x(W.S.#1)S 537 x(SUN)S 269 x(W.S.#2)S 498 y
14330 X(|)S 499 y -269 x(|)S 498 y -269 x(|)S 498 y 7336 X
(#=========+++============+++==========+++================+++==#)S
537 x(Segment)S 269 x(3)S 498 y 10295 X(|)S 17827 X(|)S 22937 X(|)S
498 y 10295 X(|)S 17827 X(|)S 22937 X(|)S 498 y 9757 X(-----)S 17289 X
(-----)S 22399 X(-----)S 498 y 9757 X(VAX)S 269 x(X)S 17289 X(SUN)S
269 x(W.S.#3)S 22399 X(VAX)S 269 x(Z)S 20411 Y 5991 X F151(Example)S
166 x(1:)S 897 y 5991 X(Using)S 207 x(the)S 207 x(above)S 207 x
(\211gure)S 2 x(,)S 217 x(let')S -19 x(s)S 206 x(say)S 207 x(that)S
206 x(we)S 207 x(want)S 206 x(to)S 206 x(prevent)S 208 x(V)S -56 x
(AX)S 206 x(A)S 206 x(from)S 598 y 5991 X(communicating)S 172 x
(with)S 170 x(V)S -56 x(AX)S 170 x(X)S 170 x(or)S 171 x(Z.)S 171 x
(Using)S 171 x(RBMS,)S 171 x(we)S 170 x(can)S 171 x(tell)S 170 x
(bridge)S 171 x(#2)S 170 x(to)S 598 y 5991 X(discard)S 192 x(any)S
194 x(packets)S 192 x(it)S 192 x(receives)S 193 x(on)S 193 x(port)S
193 x(B)S 192 x(which)S 193 x(have)S 193 x(V)S -55 x(AX)S 191 x(A)S
-37 x(')S -19 x(s)S 193 x(ethernet)S 597 y 5991 X(address)S 142 x
(in)S 143 x(the)S 144 x(DESTINA)S -29 x(TION)S 142 x(\211eld.)S 215 x
(V)S -56 x(AX)S 142 x(A)S 143 x(will)S 142 x(still)S 142 x(be)S 143 x
(able)S 143 x(to)S 143 x(talk)S 143 x(with)S 598 y 5991 X(Nodes)S
166 x(on)S 166 x(segment)S 166 x(2.)S 25492 Y 5991 X(Example)S 166 x
(2:)S 897 y 5991 X(In)S 219 x(the)S 219 x(previous)S 220 x
(\211gure,)S 234 x(segment)S 219 x(1)S 219 x(has)S 218 x(several)S
220 x(DEC)S -2 x(servers)S 220 x(and)S 219 x(a)S 219 x(V)S -56 x(AX)S
598 y 5991 X(runnin)S 2 x(g)S 118 x(VMS)S 117 x(attached)S 118 x(to)S
118 x(it.)S 206 x(Segment)S 118 x(2)S 118 x(has)S 118 x(numerous)S
118 x(SUN)S 118 x(workstations)S 598 y 5991 X(and)S 153 x(UNIX)S
152 x(nodes)S 152 x(attached)S 153 x(to)S 152 x(it.)S 217 x(Segment)S
153 x(3)S 153 x(has)S 152 x(various)S 153 x(nodes)S 153 x(on)S 153 x
(it,)S 155 x(both)S 597 y 5991 X(VMS)S 166 x(and)S 166 x(UNIX.)S
29901 Y 4796 X F152(2\20310)S 498 x(Linking)S 167 x(Ethernet)S 167 x
(Segmen)S 2 x(ts)S
PP
EP
%%DOC$Page: 2-11 33
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(A)S 176 x(common)S 178 x(Ethernet)S 177 x
(communications)S 177 x(protocol)S 177 x(used)S 176 x(on)S 178 x
(UNIX)S 176 x(systems)S 176 x(is)S 598 y 5991 X(TCPIP)S -64 x(,)S
233 x(which)S 232 x(makes)S 233 x(heavy)S 233 x(use)S 233 x(of)S
232 x(the)S 233 x("Broadcast")S 231 x(message)S 232 x(type.)S 421 x
(By)S 598 y 5991 X(default,)S 227 x(any)S 216 x(packet)S 215 x(with)S
215 x(a)S 215 x(Broadcast)S 214 x(destination)S 214 x(is)S 215 x
(forwarded)S 214 x(to)S 215 x(ALL)S 598 y 5991 X(ethernet)S 166 x
(segments.)S 222 x(Since)S 166 x(we)S 165 x(only)S 166 x(have)S 166 x
(DECservers)S 165 x(and)S 166 x(a)S 165 x(V)S -56 x(AX)S 165 x(runn)S
2 x(ing)S 597 y 5991 X(VMS)S 216 x(on)S 218 x(segment)S 217 x(1,)S
230 x(we)S 216 x(have)S 218 x(no)S 217 x(need)S 217 x(for)S 217 x
(the)S 217 x(TCPIP)S 217 x(broadcast)S 216 x(traf\211c.)S 598 y
5991 X(Indeed,)S 164 x(BROAD)S -2 x(CAST)S 163 x(packets)S 162 x(in)S
164 x(excess)S 163 x(of)S 163 x(10)S 163 x(per)S 163 x(second)S 163 x
(can)S 163 x(cause)S 164 x(LA)S -28 x(T)S 598 y 5991 X(problems,)S
238 x(causing)S 224 x(DECserver)S 223 x(users)S 224 x(to)S 223 x(be)S
224 x(disconnected)S 224 x(with)S 223 x("timeout")S 598 y 5991 X
(errors.)S 9947 Y 5991 X(Using)S 200 x(RBMS,)S 200 x(we)S 199 x(can)S
200 x(tell)S 199 x(LB)S 200 x(#1)S 199 x(to)S 200 x("discard")S 199 x
(any)S 200 x(traf\211c)S 200 x(it)S 199 x(sees)S 199 x(coming)S 598 y
5991 X(in)S 199 x(on)S 200 x(port)S 198 x(B)S 199 x(with)S 199 x(a)S
198 x(BROAD)S -2 x(CAST)S 199 x(destination)S 198 x(address.)S 320 x
(This)S 199 x(drops)S 199 x(the)S 597 y 5991 X(traf\211c)S 174 x
(level)S 174 x(on)S 175 x(segment)S 174 x(1,)S 176 x(while)S 174 x
(still)S 172 x(permitting)S 175 x(the)S 174 x(TCPIP)S 173 x
(traf\211c)S 175 x(to)S 173 x(be)S 598 y 5991 X(seen)S 166 x(on)S
167 x(segments)S 166 x(2)S 166 x(&)S 166 x(3.)S 13235 Y 4796 X F24
(2.2)S 348 x(How)S 231 x(do)S 233 x(we)S 232 x(do)S 232 x(it?)S 896 y
5991 X F151(In)S 184 x(order)S 184 x(to)S 183 x(understand)S 185 x
(how)S 183 x(the)S 184 x(LB100)S 184 x(works,)S 188 x(it)S 183 x(is)S
184 x(necessary)S 184 x(to)S 184 x(under-)S 598 y 5991 X(stand)S
170 x(the)S 171 x(structure)S 171 x(of)S 170 x(an)S 171 x(Ethernet)S
171 x(data)S 170 x(packet.)S 235 x(Let')S -18 x(s)S 170 x(take)S
171 x(another)S 171 x(look)S 598 y 5991 X(at)S 167 x(a)S 166 x
(typical)S 167 x(Ethernet)S 167 x(V2)S 167 x(data)S 166 x(packet,)S
168 x(as)S 166 x(it)S 167 x(makes)S 166 x(its)S 166 x(way)S 167 x
(happily)S 167 x(along)S 598 y 5991 X(the)S 166 x(backbone,)S 168 x
(unaware)S 166 x(that)S 166 x(we)S 166 x(are)S 166 x(watching)S 167 x
(it.)S 398 y 6260 X F98
(_______________________________________________________________)S
498 y 5991 X(|)S 269 x(Destination)S 269 x(Addr)S 269 x(|)S 269 x
(Source)S 269 x(Addr)S 269 x(|)S 269 x(Protocol)S 269 x(Type)S 269 x
(|)S 269 x(Data)S 269 x(|)S 538 x(CRC)S 537 x(|)S 498 y 6260 X
(---------------------------------------------------------------)S
498 y 7336 X(6)S 269 x(Bytes)S 11909 X(6)S 269 x(Bytes)S 15944 X(2)S
269 x(Bytes)S 19979 X(??)S 807 x(4)S 269 x(Bytes)S 19013 Y 5991 X
F151(\201)S 595 x(Destination)S 217 x(Addr:)S 326 x(The)S 219 x
(Ethernet)S 219 x(address)S 217 x(of)S 218 x(the)S 219 x(node)S 218 x
(to)S 218 x(which)S 219 x(the)S 598 y 6888 X(packet)S 214 x(is)S
213 x(being)S 214 x(sent.)S 364 x(In)S 214 x(addition)S 213 x(to)S
214 x(sending)S 214 x(a)S 213 x(packet)S 214 x(to)S 214 x(a)S 213 x
(speci)S
(\211c)S 597 y 6888 X(node')S -19 x(s)S 228 x(address,)S 245 x(a)S
228 x(packet)S 229 x(can)S 229 x(be)S 229 x(sent)S 228 x(to)S 228 x
(a)S 229 x(Multicast)S 228 x(address)S 228 x(\(as)S 228 x(a)S 598 y
6888 X(LA)S -28 x(T)S 245 x(service)S 245 x(announc)S 2 x(ement)S
244 x(is\),)S 264 x(which)S 245 x(is)S 244 x(heard)S 245 x(by)S 245 x
(more)S 245 x(than)S 245 x(one)S 598 y 6888 X(node)S 183 x(on)S 183 x
(the)S 183 x(Ethernet.)S 271 x(It)S 183 x(can)S 183 x(also)S 182 x
(be)S 182 x(sent)S 183 x(to)S 182 x(a)S 183 x("Broadcast")S 181 x
(address,)S 598 y 6888 X(which)S 166 x(targets)S 166 x(ALL)S 166 x
(nodes)S 166 x(on)S 167 x(the)S 166 x(Ethernet.)S 896 y 5991 X(\201)S
595 x(Source)S 166 x(Addr:)S 222 x(The)S 167 x(Ethernet)S 166 x
(address)S 165 x(af)S 166 x(the)S 166 x(node)S 167 x(sending)S 167 x
(the)S 166 x(packet.)S 897 y 5991 X(\201)S 595 x(Protocol)S 166 x(T)S
-25 x(ype:)S 222 x(60-03)S 166 x(for)S 166 x(DECNE)S -2 x(T)S -45 x
(,)S 166 x(60-04)S 166 x(for)S 166 x(LA)S -27 x(T)S -46 x(,)S 167 x
(etc.)S 897 y 5991 X(\201)S 595 x(Data:)S 221 x(Between)S 165 x(46)S
166 x(and)S 167 x(1500)S 166 x(bytes)S 165 x(of)S 166 x(data.)S 896 y
5991 X(\201)S 595 x(CRC:)S 165 x(CRC-32)S 165 x(polynomial)S 166 x
(check)S 168 x(on)S 166 x(the)S 166 x(rest)S 166 x(of)S 166 x(the)S
166 x(frame')S -19 x(s)S 166 x(data.)S 29901 Y 14869 X F152(Linking)S
168 x(Ethernet)S 167 x(Segmen)S 2 x(ts)S 498 x(2\2031)S -37 x(1)S
PP
EP
%%DOC$Page: 2-12 34
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(The)S 137 x(LB100)S 135 x(maintains)S 136 x(a)S
136 x("NODE)S 134 x(ADDRE)S -2 x(SS)S 136 x(T)S -27 x(ABLE")S 135 x
(in)S 136 x(memory)S 136 x(of)S 136 x(all)S 136 x(the)S 598 y 5991 X
(Ethernet)S 161 x(addresses)S 159 x(hehears)S 162 x(on)S 161 x(his)S
160 x(two)S 160 x(Ethernet)S 161 x(ports.)S 219 x(Along)S 162 x
(with)S 160 x(each)S 598 y 5991 X(address)S 165 x(is)S 166 x(stored)S
166 x(a)S 166 x("ST)S -28 x(A)S -28 x(TUS)S 166 x(WORD",)S 165 x
(which)S 167 x(describes:)S 897 y 5991 X(\201)S 595 x(Which)S 166 x
(port)S 166 x(\(A)S 166 x(or)S 166 x(B\))S 166 x(the)S 166 x
(address)S 165 x(was)S 165 x(heard)S 167 x(on.)S 896 y 5991 X(\201)S
595 x(How)S 165 x(long)S 167 x(ago)S 167 x(the)S 166 x(address)S
165 x(was)S 166 x(seen.)S 897 y 5991 X(\201)S 595 x(Whether)S 166 x
(the)S 166 x(address)S 166 x(was)S 165 x(learned)S 166 x(or)S 167 x
(set)S 165 x(via)S 167 x(RBMS.)S 9648 Y 5991 X(Whenever)S 220 x(the)S
220 x(LB100)S 218 x(hears)S 220 x(a)S 219 x(packet)S 219 x(on)S 220 x
(one)S 219 x(of)S 219 x(his)S 219 x(Ethernet)S 219 x(ports,)S 233 x
(he)S 598 y 5991 X(examines)S 155 x(the)S 154 x(SOURCE)S 153 x
(\211eld)S 155 x(of)S 154 x(the)S 155 x(packet.)S 218 x(If)S 154 x
(he)S 155 x(\211nds)S 154 x(the)S 155 x(address)S 154 x(of)S 154 x
(the)S 598 y 5991 X(sending)S 170 x(\(SOURCE\))S 168 x(node)S 170 x
(is)S 169 x(NOT)S 169 x(in)S 170 x(the)S 170 x(Node)S 169 x(Address)S
169 x(T)S -31 x(able,)S 171 x(he)S 170 x(adds)S 169 x(it.)S 597 y
5991 X(If)S 205 x(he)S 206 x(\211nds)S 205 x(the)S 206 x(address)S
204 x(is)S 205 x(already)S 206 x(present)S 205 x(in)S 206 x(the)S
205 x(table,)S 215 x(he)S 206 x(updates)S 205 x(the)S 598 y 5991 X
("time)S 165 x(since)S 167 x(heard")S 166 x(in)S 166 x(the)S 166 x
(status)S 166 x(\211eld)S 166 x(for)S 166 x(that)S 166 x(address.)S
897 y 5991 X(The)S 278 x(LB100)S 277 x(next)S 277 x(examines)S 278 x
(the)S 277 x(DESTINA)S -29 x(TION)S 277 x(\211eld)S 277 x(of)S 277 x
(the)S 277 x(Ethernet)S 597 y 5991 X(packet.)S 388 x(If)S 221 x(the)S
221 x(address)S 221 x(is)S 221 x(found)S 222 x(in)S 221 x(the)S 222 x
(table,)S 235 x(the)S 222 x(status)S 220 x(word)S 221 x(for)S 221 x
(that)S 598 y 5991 X(address)S 165 x(is)S 166 x(examined)S 167 x(to)S
166 x(determine)S 166 x(packet)S 166 x(disposition.)S 897 y 5991 X
(\201)S 595 x(If)S 144 x(the)S 144 x(DESTINA)S -29 x(TION)S 144 x
(address)S 144 x(is)S 144 x(associated)S 143 x(with)S 144 x(the)S
145 x(same)S 144 x(port)S 144 x(\(A)S 144 x(or)S 598 y 6888 X(B\))S
184 x(that)S 185 x(the)S 185 x(packet)S 185 x(came)S 185 x(in)S 185 x
(on,)S 191 x(then)S 185 x(the)S 185 x(packet)S 186 x(is)S 184 x
(discarded.)S 278 x(There)S 597 y 6888 X(is)S 167 x(no)S 168 x
(point)S 167 x(in)S 168 x(forwarding)S 168 x(a)S 167 x(packet)S 168 x
(to)S 167 x(side)S 167 x(B)S 167 x(if)S 167 x(both)S 168 x(the)S
168 x(Sending)S 168 x(and)S 598 y 6888 X(receiving)S 167 x(nodes)S
166 x(are)S 167 x(on)S 166 x(side)S 166 x(A.)S 897 y 5991 X(\201)S
595 x(If)S 241 x(the)S 242 x(DESTINA)S -29 x(TION)S 242 x(address)S
241 x(is)S 241 x(associated)S 241 x(with)S 241 x(port)S 242 x(B,)S
242 x(and)S 242 x(the)S 598 y 6888 X(packet)S 171 x(came)S 171 x(in)S
172 x(on)S 171 x(port)S 171 x(A,)S 172 x(then)S 171 x(the)S 172 x
(packet)S 171 x(will)S 170 x(be)S 172 x(forwarded)S 170 x(to)S 171 x
(port)S 597 y 6888 X(B.)S 897 y 5991 X(\201)S 595 x(If)S 181 x(the)S
181 x(DESTINA)S -28 x(TION)S 181 x(address)S 180 x(has)S 182 x(not)S
181 x(been)S 182 x(heard)S 182 x(from,)S 186 x(the)S 181 x(LB100)S
598 y 6888 X(MUST)S 198 x(forward)S 198 x(the)S 198 x(packet)S 199 x
(to)S 198 x(the)S 198 x(other)S 199 x(port,)S 206 x(since)S 199 x
(he)S 198 x(doesn')S -9 x(t)S 198 x(know)S 597 y 6888 X(where)S 166 x
(the)S 166 x(destination)S 166 x(node)S 166 x(is.)S 897 y 5991 X
(\201)S 595 x(If)S 145 x(the)S 145 x(DESTINA)S -28 x(TION)S 144 x
(address)S 145 x(is)S 145 x(MUL)S -27 x(TICAST)S 145 x(or)S 146 x
(BRO)S -2 x(ADCAST)S -47 x(,)S 146 x(and)S 598 y 6888 X(RBMS)S 171 x
(has)S 172 x(not)S 173 x(been)S 173 x(used)S 172 x(to)S 172 x(force)S
172 x(\211ltering,)S 176 x(then)S 172 x(the)S 173 x(packet)S 172 x
(must)S 172 x(be)S 598 y 6888 X(forwarded.)S 896 y 5991 X(\201)S
595 x(If)S 126 x(the)S 127 x(DESTINA)S -29 x(TION)S 126 x(address)S
126 x(is)S 126 x(found,)S 136 x(but)S 127 x(the)S 126 x(status)S
126 x(word)S 127 x(indicates)S 598 y 6888 X(that)S 196 x(RBMS)S 196 x
(has)S 197 x(been)S 197 x(used)S 197 x(to)S 196 x(keep)S 198 x
(traf\211c)S 197 x(for)S 197 x(this)S 196 x(node)S 197 x(on)S 197 x
(only)S 198 x(one)S 598 y 6888 X(port,)S 166 x(the)S 166 x(packet)S
167 x(will)S 165 x(be)S 166 x(forwarded)S 166 x(or)S 166 x
(discarded,)S 166 x(as)S 166 x(appropriate.)S 29901 Y 4796 X F152
(2\20312)S 498 x(Linking)S 150 x(Ethernet)S 151 x(Segment)S 2 x(s)S
PP
EP
%%DOC$Page: 2-13 35
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Armed)S 138 x(with)S 137 x(this)S 138 x
(knowledge,)S 145 x(and)S 138 x(assuming)S 138 x(that)S 138 x(NO)S
138 x(addresses)S 137 x(have)S 139 x(been)S 598 y 5991 X(modi\211ed)S
156 x(using)S 156 x(RBMS,)S 155 x(and)S 155 x(assuming)S 156 x(that)S
155 x(ALL)S 156 x(nodes)S 155 x(have)S 156 x(been)S 156 x(seen)S
156 x(by)S 598 y 5991 X(both)S 155 x(LAN)S 155 x(Bridges,)S 157 x
(if)S 154 x(we)S 155 x(could)S 155 x(display)S 154 x(the)S 155 x
(node)S 156 x(table)S 154 x(entries)S 155 x(of)S 154 x(the)S 155 x
(LAN)S 598 y 5991 X(Bridges)S 166 x(in)S 166 x(the)S 166 x(previous)S
167 x(\211gur)S 2 x(e,)S 166 x(we)S 166 x(would)S 166 x(see:)S 7008 Y
4796 X F36(T)S -37 x(able)S 150 x(2\2031:)S 498 x(LB100)S 149 x(#1)S
150 x(Address)S 149 x(entries)S 224 y 4796 X 17928 24 R 598 y 4796 X
F157(Port)S 149 x(A)S 12367 X(Port)S 149 x(B)S 299 y 4796 X
17928 24 R 647 y 4796 X F155(DECs)S -2 x(erver)S 150 x(1)S 12367 X
(Unix)S 150 x(V)S -50 x(AX)S 148 x(1)S 897 y 4796 X(DECs)S -2 x
(erver)S 150 x(2)S 12367 X(SUN)S 151 x(W)S -50 x(.S.)S 149 x(#1)S
897 y 4796 X(DECs)S -2 x(erver)S 150 x(3)S 12367 X(SUN)S 151 x(W)S
-50 x(.S.)S 149 x(#2)S 896 y 4796 X(V)S -51 x(AX)S 149 x(A)S 12367 X
(SUN)S 151 x(W)S -50 x(.S.)S 149 x(#3)S 897 y 12367 X(V)S -50 x(AX)S
149 x(X)S 897 y 12367 X(V)S -50 x(AX)S 149 x(Z)S 398 y 4796 X
17928 24 R 14903 Y 4796 X F36(T)S -37 x(able)S 150 x(2\2032:)S 498 x
(LB100)S 149 x(#2)S 150 x(Address)S 149 x(entries)S 225 y 4796 X
17928 24 R 597 y 4796 X F157(Port)S 149 x(A)S 12367 X(Port)S 149 x
(B)S 299 y 4796 X 17928 24 R 648 y 4796 X F155(DECs)S -2 x(erver)S
150 x(1)S 12367 X(V)S -50 x(AX)S 149 x(X)S 896 y 4796 X(DECs)S -2 x
(erver)S 150 x(2)S 12367 X(V)S -50 x(AX)S 149 x(Z)S 897 y 4796 X
(DECs)S -2 x(erver)S 150 x(3)S 12367 X(SUN)S 151 x(W)S -50 x(.S.)S
149 x(#3)S 897 y 4796 X(V)S -51 x(AX)S 149 x(A)S 896 y 4796 X(Unix)S
149 x(V)S -50 x(AX)S 149 x(1)S 897 y 4796 X(SUN)S 150 x(W)S -50 x
(.S.)S 149 x(#1)S 897 y 4796 X(SUN)S 150 x(W)S -50 x(.S.)S 149 x(#2)S
398 y 4796 X 17928 24 R 24443 Y 5991 X F151(Remember)S -37 x(,)S
133 x(bridges)S 124 x(pass)S 122 x(data)S 124 x(TRANSP)S -37 x
(ARENTL)S -47 x(Y)S -55 x(,)S 124 x(so)S 123 x(a)S 124 x(bridge)S
124 x(has)S 124 x(no)S 124 x(idea)S 597 y 5991 X(how)S 143 x(many)S
143 x(bridges)S 143 x(any)S 144 x(packet)S 143 x(may)S 143 x(have)S
144 x(passed)S 142 x(through)S 144 x(before)S 143 x(it)S 143 x
(arrives)S 598 y 5991 X(at)S 162 x(the)S 162 x(bridge')S -18 x(s)S
161 x(Ethernet)S 162 x(port.)S 221 x(All)S 161 x(the)S 162 x(bridge)S
163 x(can)S 162 x(say)S 162 x(is)S 161 x(WHICH)S 161 x(port)S 162 x
(the)S 598 y 5991 X(packet)S 195 x(arrived)S 196 x(on-)S 195 x
(Thus,)S 204 x(the)S 195 x(bridge)S 195 x(only)S 196 x(knows)S 195 x
(WHICH)S 194 x(port)S 195 x(a)S 195 x(V)S -56 x(AX)S 195 x(is)S 598 y
5991 X(on,)S 144 x(not)S 137 x(how)S 137 x(far)S 137 x(away)S 137 x
(the)S 138 x(V)S -56 x(AX)S 136 x(is,)S 143 x(or)S 138 x(how)S 137 x
(many)S 137 x(other)S 138 x(bridges)S 137 x(are)S 137 x(between)S
597 y 5991 X(it)S 166 x(and)S 166 x(the)S 166 x(V)S -55 x(AX.)S
29901 Y 14833 X F152(Linking)S 167 x(Ethernet)S 167 x(Segmen)S 2 x
(ts)S 498 x(2\20313)S
PP
EP
%%DOC$Page: 2-14 36
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(So)S 154 x(much)S 155 x(for)S 154 x(how)S 154 x
("Store)S 154 x(and)S 154 x(Forward")S 154 x(works)S 154 x(on)S 155 x
(a)S 154 x(LAN)S 154 x(bridge.)S 218 x(Next,)S 158 x(we)S 598 y
5991 X(tackle)S 166 x(the)S 167 x(issue)S 165 x(of)S 166 x(LOOP)S
166 x(DETECTIO)S -2 x(N.)S 5763 Y 4796 X F28(2.2.1)S 300 x(Spanning)S
200 x(T)S -32 x(ree)S 199 x(and)S 200 x(Loop)S 201 x(Detection)S
7556 Y 5991 X F151(Before)S 283 x(storing)S 284 x(and)S 283 x
(forwarding,)S 313 x(a)S 283 x(LAN)S 283 x(Bridge)S 283 x(100')S
-19 x(s)S 283 x(most)S 282 x(important)S 598 y 5991 X(function)S
167 x(is)S 166 x(loop)S 166 x(detection)S 166 x(and)S 166 x
(prevention.)S 9349 Y 4796 X F36(2.2.1.1)S 250 x(Spanni)S 2 x(ng)S
166 x(T)S -27 x(ree)S 166 x(in)S 167 x(a)S 166 x(Nutshell)S 11142 Y
5991 X F151(LAN)S 177 x(Bridge)S 178 x(100')S -19 x(s)S 177 x(\(and)S
177 x(V)S -22 x(italink)S 178 x(T)S -31 x(ranslan')S -18 x(s-)S 176 x
(but)S 178 x(hey)S -54 x(,)S 180 x(this)S 177 x(is)S 177 x(the)S
178 x(LB100')S -19 x(s)S 598 y 5991 X(Nutshell\))S 135 x(talk)S 135 x
(to)S 135 x(each)S 136 x(other)S 135 x(on)S 136 x(the)S 135 x
(Ethernet)S 135 x(via)S 136 x("Hello")S 134 x(messages.)S 211 x
(These)S 598 y 5991 X(messages)S 273 x(have)S 275 x(a)S 274 x
(protocol)S 274 x(type)S 274 x(of)S 274 x(80-38.)S 545 x(Using)S
274 x(these)S 274 x(messages,)S 300 x(all)S 598 y 5991 X(the)S 235 x
(bridges)S 235 x(in)S 235 x(the)S 235 x(extended)S 236 x(LAN)S 234 x
(elect)S 235 x(a)S 235 x(single)S 235 x("Root")S 234 x(bridge,)S
253 x(who)S 235 x(is)S 597 y 5991 X(thereafter)S 152 x(known)S 153 x
(as)S 152 x("Don)S 152 x(Corleone".)S 217 x(The)S 153 x(Root)S 152 x
(bridge)S 152 x(is)S 152 x(the)S 152 x(Big)S 153 x(Cheese-)S 598 y
5991 X(once)S 185 x(he')S -18 x(s)S 184 x(elected,)S 189 x(all)S
184 x(the)S 185 x(other)S 185 x(bridges)S 185 x(in)S 184 x(the)S
185 x(LAN)S 184 x(report)S 185 x(to)S 184 x(him.)S 277 x(They)S 598 y
5991 X(all)S 158 x(tell)S 158 x(him)S 159 x(where)S 158 x(they)S
159 x(are,)S 161 x(and)S 158 x(how)S 159 x(important)S 158 x(their)S
158 x(links)S 159 x(are-)S 158 x(in)S 159 x(short,)S 598 y 5991 X
(they)S 150 x(all)S 150 x(beg)S 150 x(for)S 150 x(mercy)S -55 x(.)S
216 x(Don)S 150 x(Corleone)S 150 x(listens)S 149 x(to)S 149 x(their)S
150 x(requests,)S 153 x(and)S 150 x(if)S 149 x(any)S 598 y 5991 X
(LOOPS)S 205 x(are)S 206 x(detected,)S 215 x(Don)S 206 x(Corleone)S
206 x(tells)S 204 x(one)S 206 x(or)S 206 x(more)S 206 x(of)S 205 x
(the)S 206 x(bridges)S 205 x(to)S 597 y 5991 X(turn)S 185 x(off)S
185 x(a)S 184 x(port)S 184 x(\(the)S 185 x(port)S 184 x(on)S 185 x
(the)S 185 x(F)S -37 x(AR)S 184 x(side)S 184 x(from)S 185 x(the)S
184 x(Root)S 184 x(bridge\),)S 190 x(until)S 185 x(a)S 598 y 5991 X
(LOOP-FREE,)S 169 x(or)S 170 x("Spanning)S 170 x(T)S -30 x(ree")S
169 x(topology)S 171 x(results.)S 232 x(A)S 169 x(bridge)S 171 x
(with)S 169 x(a)S 169 x(port)S 598 y 5991 X(turned)S 171 x(off)S
170 x(is)S 170 x(said)S 170 x(to)S 171 x(be)S 170 x(in)S 171 x
("backup")S 171 x(mode,)S 172 x(and)S 170 x(does)S 171 x(NOT)S 170 x
(forward)S 170 x(traf\211c)S 598 y 5991 X(in)S 166 x(either)S 167 x
(direction.)S 20109 Y 5991 X(Once)S 170 x(the)S 170 x(LAN)S 170 x
(is)S 169 x(loop-free,)S 172 x(all)S 170 x(the)S 170 x(bridges)S
170 x(except)S 170 x(the)S 170 x(Root)S 170 x(shut)S 170 x(up.)S
234 x(The)S 598 y 5991 X(Root)S 204 x(bridge)S 204 x(sends)S 204 x
(out)S 204 x("Hello")S 204 x(messages)S 203 x(once)S 205 x(per)S
204 x(second,)S 215 x(and)S 204 x(all)S 204 x(other)S 597 y 5991 X
(bridges)S 134 x(listen)S 134 x(for)S 134 x(this)S 134 x("Hello")S
134 x(message)S 134 x(\(Including)S 135 x(those)S 134 x(bridges)S
134 x(who)S 134 x(were)S 598 y 5991 X(told)S 153 x(to)S 154 x(shut)S
154 x(off)S 153 x(a)S 154 x(port-)S 153 x(remember)S -37 x(,)S 157 x
(the)S 154 x(port)S 153 x("facing")S 154 x(the)S 154 x(Root)S 153 x
(was)S 153 x(left)S 153 x(on.\))S 598 y 5991 X(If)S 162 x(a)S 163 x
(bridge)S 163 x(doesn')S -9 x(t)S 163 x(hear)S 163 x(this)S 163 x
("Hello")S 162 x(message)S 162 x(for)S 163 x(a)S 163 x(pre-set)S
162 x(period)S 163 x(of)S 163 x(time)S 598 y 5991 X(\(5)S 186 x
(seconds)S 185 x(by)S 187 x(default\),)S 191 x(it)S 185 x(is)S 186 x
(assumed)S 185 x(that)S 186 x(the)S 186 x(Root)S 185 x(is)S 186 x
(dead)S 185 x(\(Ding-Dong,)S 597 y 5991 X(the)S 180 x(wicked)S 180 x
(witch...\))S 264 x(and)S 180 x(all)S 180 x(of)S 180 x(the)S 180 x
(bridges,)S 184 x(with)S 179 x(great)S 181 x(excitement,)S 184 x
(start)S 598 y 5991 X(campaigning)S 191 x(among)S 191 x(themselves)S
189 x(to)S 190 x(elect)S 190 x(a)S 189 x(new)S 190 x(Root)S 189 x
(\(Ever)S 190 x(see)S 190 x(a)S 189 x(LB100)S 598 y 5991 X(kissing)S
166 x(babies)S 166 x(and)S 166 x(eating)S 167 x(pizza?)S 220 x
(Amazing.\))S 29901 Y 4796 X F152(2\20314)S 498 x(Linking)S 167 x
(Ethernet)S 167 x(Segmen)S 2 x(ts)S
PP
EP
%%DOC$Page: 2-15 37
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Let')S -19 x(s)S 166 x(look)S 166 x(at)S 166 x
(the)S 166 x(following)S 167 x(con\211gur)S 2 x(ation:)S 6958 Y
5991 X F36(Figu)S 2 x(re)S 165 x(2\2035:)S 498 x(Example)S 167 x(of)S
166 x(an)S 167 x(extended)S 167 x(LAN)S 165 x(with)S 167 x(Loops)S
8366 Y 12985 X F98(VAX)S 269 x(A)S 19710 X(DECserver)S 268 x(#3)S
499 y 12985 X(-----)S 19710 X(---------)S 498 y 13523 X(|)S 20786 X
(|)S 498 y 13523 X(|)S 20786 X(|)S 498 y 5991 X
(#====+++===================+++===========+++==========+++=========#)S
537 x(Segment)S 269 x(1)S 498 y 7605 X(|)S 17289 X(|)S 498 y 7605 X
(|)S 17289 X(|)S 498 y 7605 X(|)S 16751 X(port)S 269 x(A)S 498 y
7605 X(|)S 16213 X(DEBET-AA)S 538 x(\(LAN)S 269 x(Bridge)S 268 x
(100)S 269 x(#1\))S 499 y 7605 X(|)S 16482 X(port)S 269 x(B)S 807 x
(08-00-2B-01-23-44)S 498 y 7605 X(|)S 17289 X(|)S 498 y 7605 X(|)S
17289 X(|)S 498 y 6798 X(port)S 269 x(A)S 12985 X
(#===+++========+++==============+++===========+++===#)S 498 y 6529 X
(DEBET-AA)S 269 x(\(LB100)S 269 x(#3\))S 14330 X(|)S 21862 X(|)S
25627 X(|)S 498 y 6798 X(port)S 269 x(B)S 538 x(08-00-2B-01-23-43)S
807 x(|)S 21862 X(|)S 25627 X(|)S 498 y 7605 X(|)S 13792 X(port)S
269 x(A)S 21862 X(|)S 25627 X(|)S 498 y 7605 X(|)S 13523 X(DEBET-AA)S
269 x(\(LB100)S 269 x(#2\))S 21862 X(|)S 25627 X(|)S 499 y 7605 X(|)S
13792 X(port)S 269 x(B)S 538 x(08-00-2B-01-23-45)S 538 x(-------)S
24282 X(-------)S 498 y 7605 X(|)S 14330 X(|)S 21055 X(SUN)S 268 x
(W.S.#1)S 538 x(SUN)S 269 x(W.S.#2)S 498 y 7605 X(|)S 14330 X(|)S
498 y 7605 X(|)S 14330 X(|)S 498 y 7605 X(|)S 14330 X(|)S 498 y
6529 X
(#==+++=======+++============+++==========+++================+++==#)S
537 x(Segment)S 269 x(3)S 498 y 10295 X(|)S 17827 X(|)S 22937 X(|)S
499 y 10295 X(|)S 17827 X(|)S 22937 X(|)S 498 y 9757 X(-----)S 17289 X
(-----)S 22399 X(-----)S 498 y 9757 X(VAX)S 269 x(X)S 17289 X(SUN)S
269 x(W.S.#3)S 22399 X(VAX)S 269 x(Z)S 23410 Y 5991 X F151
(Examination)S 242 x(of)S 241 x(the)S 242 x(above)S 242 x(topology)S
242 x(will)S 240 x(show)S 241 x(that)S 242 x(a)S 241 x(loop)S 241 x
(exists.)S 448 x(For)S 598 y 5991 X(instance,)S 224 x(if)S 211 x(V)S
-56 x(AX)S 211 x(A)S 211 x(sends)S 212 x(a)S 211 x(packet)S 212 x
(to)S 212 x(V)S -56 x(AX)S 211 x(X,)S 211 x(it)S 212 x(could)S 212 x
(travel)S 212 x(over)S 212 x(both)S 597 y 5991 X(LAN)S 166 x(Bridge)S
166 x(#3)S 166 x(and)S 166 x(LAN)S 166 x(Bridges)S 166 x(#1)S 166 x
(and)S 167 x(#2)S 166 x(to)S 165 x(arrive)S 167 x(at)S 166 x(V)S
-56 x(AX)S 166 x(X.)S 26399 Y 5991 X(If)S 202 x(loops)S 202 x(were)S
202 x(allowed)S 202 x(to)S 202 x(exist,)S 212 x(the)S 203 x(same)S
202 x(packet)S 202 x(would)S 203 x(arrive)S 203 x(at)S 202 x(BOTH)S
598 y 5991 X(ports)S 114 x(of)S 114 x(a)S 115 x(LAN)S 114 x(Bridge)S
114 x(100,)S 125 x(and)S 115 x(the)S 115 x(LAN)S 114 x(Bridge)S 114 x
(wouldn')S -9 x(t)S 114 x(know)S 115 x(which)S 115 x(side)S 597 y
5991 X(the)S 154 x(node)S 155 x(was)S 154 x(on,)S 157 x(and)S 155 x
(would)S 154 x(be)S 154 x(unable)S 155 x(to)S 154 x(make)S 154 x
(Store/Forward)S 155 x(decisions.)S 29901 Y 14833 X F152(Linking)S
167 x(Ethernet)S 167 x(Segmen)S 2 x(ts)S 498 x(2\20315)S
PP
EP
%%DOC$Page: 2-16 38
1000 BP 39600 30600 PM 0 0 XY
3975 Y 4796 X F36(2.2.1.2)S 250 x(Spanni)S 2 x(ng)S 166 x(T)S -27 x
(ree)S 166 x(in)S 167 x(a)S 166 x(BIGGER)S 165 x(Nutshell)S 5768 Y
5991 X F151(The)S 208 x(Inter)S -9 x(-bridge)S 208 x(protocol)S 207 x
(used)S 207 x(by)S 208 x(both)S 207 x(LAN)S 207 x(Bridge)S 208 x
(100')S -19 x(s)S 207 x(and)S 207 x(V)S -22 x(italink)S 598 y 5991 X
(T)S -31 x(ranslans)S 239 x(is)S 239 x(called)S 238 x(Spanning)S
240 x(T)S -30 x(ree)S 239 x(Protocol)S 239 x(\(STP\),)S 240 x(since)S
239 x(the)S 239 x(resulting)S 598 y 5991 X(LAN)S 206 x(topology)S
207 x(resembles)S 206 x(a)S 206 x(tree')S -19 x(s)S 206 x(branches,)S
217 x(which)S 207 x(do)S 206 x(NOT)S 206 x(loop.)S 342 x(These)S
598 y 5991 X(messages)S 165 x(have)S 167 x(a)S 166 x(protocol)S 167 x
(type)S 166 x(of)S 166 x(80-38.)S 9355 Y 5991 X(The)S 145 x(\211rst)S
144 x(step)S 143 x(in)S 145 x(STP)S 144 x(is)S 144 x(the)S 144 x
("election")S 144 x(of)S 144 x(a)S 144 x("Root")S 143 x(bridge.)S
215 x(The)S 145 x(bridge)S 145 x(with)S 598 y 5991 X(the)S 183 x
(lowest)S 182 x("Root)S 182 x(priority")S 183 x(will)S 182 x(be)S
182 x(the)S 183 x(LAN)S 183 x(root)S 183 x(bridge.)S 272 x(All)S
182 x(LAN)S 183 x(Bridge)S 597 y 5991 X(100')S -19 x(s)S 201 x(have)S
202 x(a)S 201 x(default)S 202 x(root)S 201 x(priority)S 202 x(of)S
201 x(128.)S 327 x(If)S 201 x(this)S 201 x(is)S 201 x(not)S 201 x
(modi\211ed)S 202 x(\(using)S 598 y 5991 X(RBMS\))S 149 x(then)S
150 x(all)S 150 x(LB100')S -19 x(s)S 149 x(will)S 149 x(have)S 151 x
(the)S 150 x(same)S 149 x(root)S 150 x(priority)S -55 x(,)S 154 x
(and)S 150 x(the)S 149 x(LB100)S 598 y 5991 X(with)S 166 x(the)S
166 x(lowest)S 165 x(Ethernet)S 166 x(Address)S 165 x(will)S 166 x
(become)S 166 x(the)S 166 x(Root)S 166 x(Bridge.)S 13539 Y 5991 X
(Once)S 196 x(the)S 196 x(Root)S 195 x(bridge)S 197 x(has)S 195 x
(been)S 196 x("elected",)S 204 x(all)S 195 x(other)S 196 x(LB100')S
-19 x(s)S 196 x(report)S 196 x(back)S 598 y 5991 X(to)S 218 x(the)S
217 x(root,)S 232 x(sending)S 218 x(a)S 218 x(message)S 217 x
(containing)S 219 x(their)S 218 x(Ethernet)S 218 x(address)S 217 x
(and)S 598 y 5991 X(the)S 195 x("cost")S 195 x(of)S 195 x(their)S
195 x(path)S 195 x(to)S 195 x(the)S 196 x(Root)S 194 x(Bridge.)S
310 x("Cost")S 193 x(to)S 195 x(root)S 196 x(is)S 194 x(a)S 195 x
(function)S 598 y 5991 X(of)S 184 x(how)S 183 x(many)S 184 x(LB100')S
-19 x(s)S 184 x(are)S 184 x(between)S 183 x(it)S 183 x(and)S 184 x
(the)S 184 x(Root)S 183 x(Bridge,)S 189 x(and)S 184 x(the)S 184 x
(cost)S 597 y 5991 X(of)S 226 x(the)S 227 x(bridge')S -19 x(s)S 226 x
(Ethernet)S 227 x(ports.)S 402 x(As)S 225 x(mentioned)S 227 x
(previously)S -55 x(,)S 242 x(normal)S 227 x(data)S 598 y 5991 X
(traf\211c)S 191 x(DOES)S 189 x(NOT)S 191 x(care)S 191 x(or)S 191 x
(notice)S 191 x(the)S 191 x(number)S 192 x(of)S 191 x(bridges)S 191 x
(through)S 192 x(which)S 598 y 5991 X(it)S 191 x(has)S 192 x
(passed.)S 298 x(STP)S 192 x(packets,)S 199 x(however)S -36 x(,)S
198 x(DO)S 191 x(take)S 192 x(notice,)S 199 x(for)S 192 x(the)S 191 x
(purposes)S 598 y 5991 X(of)S 207 x(calculating)S 209 x("Dis)S -2 x
(tance)S 208 x(to)S 207 x(Root".)S 345 x(By)S 208 x(default,)S 218 x
(all)S 207 x(LB100)S 207 x(lines)S 207 x(\(ports)S 207 x(A)S 597 y
5991 X(&)S 197 x(B\))S 196 x(have)S 197 x(a)S 197 x(cost)S 196 x(of)S
197 x(10.)S 313 x(All)S 196 x(line)S 197 x(costs)S 196 x(plus)S 196 x
("1")S 196 x(for)S 197 x(each)S 197 x(bridge)S 197 x(between)S 598 y
5991 X(a)S 169 x(given)S 171 x(bridge)S 170 x(and)S 170 x(the)S 169 x
(Root)S 169 x(bridge)S 170 x(are)S 170 x(added)S 169 x(together)S
170 x(to)S 169 x(determine)S 170 x(the)S 598 y 5991 X(given)S 167 x
(bridge')S -18 x(s)S 166 x("Cost)S 165 x(to)S 166 x(Root".)S 21310 Y
5991 X(The)S 170 x(Root)S 169 x(bridge)S 170 x(receives)S 169 x(all)S
169 x(these)S 170 x(messages,)S 169 x(and)S 170 x(is)S 169 x(able)S
169 x(to)S 169 x(determine)S 169 x(if)S 598 y 5991 X(any)S 128 x
(Loops)S 127 x(exist,)S 136 x(since)S 127 x(he)S 128 x(would)S 127 x
(hear)S 128 x(the)S 128 x(message)S 127 x(twice)S 127 x(on)S 127 x
(the)S 128 x(same)S 127 x(port,)S 598 y 5991 X(or)S 153 x(perhaps)S
152 x(hear)S 153 x(the)S 153 x(same)S 152 x(message)S 152 x(on)S
153 x(both)S 153 x(his)S 152 x(A)S 152 x(and)S 153 x(B)S 152 x
(ports.)S 217 x(When)S 153 x(the)S 597 y 5991 X(Root)S 129 x(bridge)S
129 x(detects)S 128 x(a)S 129 x(loop,)S 137 x(he)S 130 x(determines)S
128 x(where)S 130 x(the)S 129 x(loop)S 129 x(is,)S 136 x(and)S 129 x
(instructs)S 598 y 5991 X(the)S 143 x("Highest)S 142 x(Cost")S 142 x
(bridge)S 143 x(involoved)S 144 x(in)S 142 x(the)S 143 x(loop)S 143 x
(to)S 142 x(shut)S 143 x(off)S 142 x(1)S 142 x(port,)S 148 x
(leaving)S 598 y 5991 X(the)S 179 x(other)S 180 x(port)S 179 x
(turned)S 180 x(on)S 179 x(to)S 179 x(enable)S 180 x(the)S 179 x
(bridge)S 179 x(to)S 179 x(hear)S 180 x(the)S 179 x(Root')S -19 x(s)S
179 x("Hello")S 598 y 5991 X(messages.)S 453 x(If)S 242 x(two)S 243 x
("Contending)S 244 x(Loop")S 243 x(bridges)S 243 x(have)S 244 x(the)S
244 x(same)S 242 x("Cost)S 242 x(to)S 597 y 5991 X(Root",)S 163 x
(then)S 164 x(the)S 163 x(bridge)S 163 x(with)S 163 x(the)S 163 x
(lower)S 162 x(Ethernet)S 163 x(address)S 163 x(wins,)S 163 x(and)S
163 x(keeps)S 598 y 5991 X(his)S 182 x(ports)S 182 x(turned)S 182 x
(on,)S 187 x(while)S 182 x(the)S 182 x(bridge)S 183 x(with)S 181 x
(the)S 182 x(highe)S 2 x(r)S 182 x(Ethernet)S 182 x(address)S 598 y
5991 X(must)S 166 x(shut)S 166 x(off)S 166 x(a)S 166 x(line,)S 166 x
(going)S 168 x(into)S 166 x(Backup)S 167 x(mode.)S 29901 Y 4796 X
F152(2\20316)S 498 x(Linking)S 167 x(Ethernet)S 167 x(Segmen)S 2 x
(ts)S
PP
EP
%%DOC$Page: 2-17 39
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Thus,)S 238 x(in)S 223 x(the)S 223 x(previous)S
223 x(\211gure,)S 239 x(LB100)S 222 x(#3)S 223 x(has)S 222 x(the)S
223 x(lowest)S 222 x(address,)S 236 x(so)S 223 x(he)S 598 y 5991 X
(becomes)S 168 x(Root)S 168 x(bridge.)S 228 x(LB100)S 168 x(#1)S
168 x(and)S 169 x(#2)S 168 x(are)S 168 x(equal)S 169 x(in)S 168 x
(their)S 168 x(distance)S 168 x(from)S 598 y 5991 X(the)S 219 x
(Root,)S 233 x(so)S 219 x(we)S 219 x(shut)S 219 x(off)S 219 x(LB100)S
219 x(#2')S -19 x(s)S 219 x(\(He)S 219 x(has)S 219 x(a)S 219 x
(higher)S 221 x(address\)A)S 218 x(port,)S 598 y 5991 X(preventing)S
151 x(him)S 150 x(from)S 149 x(forwarding)S 150 x(traf\211c.)S 217 x
(LB100)S 149 x(#2)S 149 x(can)S 150 x(still)S 149 x(hear)S 150 x
(the)S 149 x(root)S 597 y 5991 X(bridge')S -18 x(s)S 192 x("Hello")S
191 x(messages)S 192 x(on)S 193 x(his)S 192 x(B)S 192 x(port,)S 199 x
(so)S 192 x(if)S 192 x(the)S 193 x(Root)S 192 x(dies,)S 199 x(and)S
192 x(LB)S 192 x(#2)S 598 y 5991 X(stops)S 150 x(hearing)S 153 x
(Hello)S 151 x(messages,)S 154 x(he)S 151 x(can)S 152 x(come)S 151 x
(out)S 152 x(of)S 151 x(backup,)S 155 x(to)S 151 x(assure)S 151 x
(that)S 598 y 5991 X(a)S 166 x(path)S 166 x(to)S 166 x(segment)S
166 x(3)S 166 x(exists.)S 9349 Y 5991 X(Of)S 230 x(course,)S 247 x
(the)S 231 x(more)S 230 x(bridges)S 231 x(you)S 231 x(have)S 231 x
(in)S 231 x(an)S 231 x(extended)S 231 x(LAN,)S 231 x(the)S 230 x
(more)S 598 y 5991 X(complex)S 231 x(the)S 230 x(Root)S 230 x
(election)S 231 x(and)S 230 x(Spanning)S 232 x(T)S -31 x(ree)S 231 x
(determination)S 230 x(becomes.)S 598 y 5991 X(I'm)S 186 x(not)S
186 x(about)S 186 x(to)S 187 x(try)S 186 x(to)S 186 x(draw)S 186 x
(a)S 187 x(complex)S 186 x(example)S 187 x(here,)S 192 x(but)S 187 x
(you)S 187 x(can)S 187 x(look)S 597 y 5991 X(at)S 166 x(pgs.)S 222 x
(3-28;3-30)S 166 x(in)S 166 x(the)S 166 x(LB100)S 166 x(technical)S
167 x(manual)S 166 x(if)S 166 x(you)S 167 x(want)S 166 x(to)S 166 x
(see)S 166 x(one.)S 897 y 5991 X(Rest)S 165 x(assured)S 167 x(that)S
166 x(V)S -23 x(italink)S 167 x(T)S -31 x(ranslans)S 167 x
(participate)S 166 x(in)S 166 x(Spanning)S 168 x(T)S -31 x(ree)S
167 x(with)S 598 y 5991 X(the)S 166 x(LB100;)S 167 x(That')S -19 x
(s)S 166 x(covered)S 167 x(in)S 166 x(the)S 166 x(next)S 167 x
(chapter)S -36 x(.)S 13832 Y 4796 X F28(2.2.2)S 300 x(LAN)S 198 x
(Bridge)S 200 x(100)S 200 x(T)S -44 x(echnic)S 2 x(al)S 200 x
(specs.)S 15626 Y 5991 X F151(Ethernet)S 236 x(bridges)S 235 x(are)S
236 x(smart)S 235 x(beasties.)S 429 x(What)S 235 x(follows)S 235 x
(is)S 235 x(a)S 235 x(discussion)S 235 x(of)S 597 y 5991 X(the)S
156 x(LAN)S 156 x(Bridge)S 156 x(100')S -19 x(s)S 156 x(TECHNICA)S
-2 x(L)S 157 x(features,)S 158 x(as)S 156 x(well)S 155 x(as)S 156 x
(his)S 155 x(POWER-UP)S 598 y 5991 X(sequence.)S 18017 Y 4796 X F28
(2.2.3)S 300 x(LB100)S 200 x(hardware)S 200 x(descriptio)S 2 x(n)S
19810 Y 5991 X F151(The)S 162 x(LAN)S 161 x(Bridge)S 162 x(100)S
161 x(has)S 161 x(a)S 161 x(MC68000)S 161 x(microprocessor)S 161 x
(chip)S 162 x(runnin)S 2 x(g)S 161 x(at)S 161 x(10)S 598 y 5991 X
(MHZ)S 188 x(for)S 188 x(a)S 187 x(brain.)S 286 x(It)S 187 x(has)S
188 x(on-board)S 187 x(PROM,)S 188 x(RAM,)S 187 x(and)S 188 x
(NVRAM,)S 187 x(and)S 188 x(two)S 597 y 5991 X(LANCE)S 165 x(chips,)S
167 x(1)S 166 x(for)S 166 x(each)S 167 x(Ethernet)S 166 x(interface)S
166 x(port.)S 897 y 5991 X(\201)S 595 x(PROM-)S 329 x(32Kb)S 329 x
(Read-only)S 330 x(memory)S 330 x(contains)S 329 x(the)S 330 x
(LB100)S 330 x(operating)S 598 y 6888 X(\211rmware,)S 166 x
(including)S 168 x(self-test)S -2 x(.)S 897 y 5991 X(\201)S 595 x
(RAM-)S 138 x(128Kb.)S 213 x(Contains)S 139 x(a)S 139 x(copy)S 140 x
(of)S 140 x(the)S 139 x(LB100)S 139 x(operating)S 141 x(system)S
138 x(loaded)S 597 y 6888 X(from)S 237 x(\211rmware,)S 255 x(the)S
237 x(node)S 238 x(address)S 236 x(table,)S 255 x(and)S 238 x
(Ethernet)S 237 x(packets)S 237 x(are)S 598 y 6888 X(all)S 154 x
(stored)S 155 x(here.)S 218 x(The)S 156 x(node)S 155 x(address)S
154 x(table)S 155 x(stores)S 154 x(the)S 155 x(addresses)S 154 x(of)S
154 x(up)S 155 x(to)S 598 y 6888 X(8000)S 135 x(nodes,)S 141 x(and)S
136 x(indicates)S 135 x(which)S 135 x(port)S 135 x(the)S 135 x(node)S
136 x(was)S 134 x(seen)S 135 x(on,)S 142 x(how)S 135 x(long)S 598 y
6888 X(since)S 166 x(last)S 165 x(seen,)S 167 x(and)S 166 x(action)S
166 x(to)S 166 x(take)S 167 x(when)S 166 x(seen)S 166 x(\(forward)S
166 x(or)S 166 x(discard.\))S 896 y 5991 X(\201)S 595 x(NVRAM-)S
140 x(2)S 141 x(KB)S 140 x(of)S 141 x(non-v)S 2 x(olatile)S 140 x
(RAM)S 141 x(stores)S 140 x(diagnostic)S 142 x(information,)S 147 x
(as)S 598 y 6888 X(well)S 165 x(as)S 166 x(addresses)S 165 x(set)S
165 x(by)S 167 x(RBMS.)S 29901 Y 537 x F152(Linking)S 167 x
(Ethernet)S 167 x(Segmen)S 2 x(ts)S 498 x(2\20317)S
PP
EP
%%DOC$Page: 2-18 40
1000 BP 39600 30600 PM 0 0 XY
3975 Y 4796 X F36(2.2.3.1)S 250 x(LAN)S 166 x(Bridge)S 166 x(100)S
166 x(DIP)S 167 x(Switches)S 5768 Y 5991 X F151(The)S 192 x(LAN)S
191 x(Bridge)S 191 x(100)S 192 x(also)S 190 x(has)S 191 x(6)S 192 x
(DIP)S 190 x(switches)S 191 x(and)S 191 x(5)S 191 x(LED')S -19 x(s)S
191 x(on)S 191 x(its)S 191 x(front)S 598 y 5991 X(panel.)S 222 x
(The)S 167 x(DIP)S 165 x(switches)S 166 x(are,)S 166 x(from)S 166 x
(#1)S 166 x(\(Leftmost\))S 165 x(to)S 166 x(#6)S 166 x
(\(Rightmost\):)S 897 y 5991 X(\201)S 595 x(#1)S 164 x(-)S 164 x
(LOOP)S 164 x(SELF)S 164 x(TEST)S -46 x(.)S 165 x(If)S 164 x
(Enabled)S 164 x(\(Down\),)S 164 x(the)S 165 x(LB100)S 164 x(will)S
163 x(continu-)S 598 y 6888 X(ally)S 166 x(loop)S 166 x(in)S 166 x
(self)S 166 x(test)S 165 x(mode.)S 222 x(Makes)S 166 x(it)S 166 x
(worthless)S 165 x(as)S 166 x(a)S 166 x(Bridge.)S 896 y 5991 X(\201)S
595 x(#2)S 272 x(-)S 273 x(NVRAM)S 272 x(RESET)S -47 x(.)S 273 x(If)S
273 x(Enabled)S 272 x(\(Down\),)S 300 x(wipes)S 271 x(out)S 273 x
(any)S 274 x(info)S 273 x(in)S 598 y 6888 X(NVRAM)S 173 x(which)S
175 x(was)S 174 x(set)S 174 x(by)S 175 x(RBMS.)S 175 x(Note:)S 239 x
(if)S 174 x(the)S 175 x(LB100)S 174 x(fails)S 174 x(NVRAM)S 598 y
6888 X(self)S 219 x(test,)S 232 x(the)S 220 x(bridge)S 220 x(can)S
220 x(still)S 219 x(be)S 219 x(made)S 220 x(to)S 219 x(operate)S
219 x(by)S 220 x(Enabling)S 221 x(this)S 597 y 6888 X(switch,)S 214 x
(but)S 205 x(RBMS)S 204 x(parameters)S 204 x(will)S 205 x(NOT)S 204 x
(be)S 205 x(retained)S 205 x(after)S 205 x(a)S 204 x(power)S 598 y
6888 X(loss.)S 897 y 5991 X(\201)S 595 x(#3)S 218 x(-)S 219 x(PORT)S
218 x(A)S 218 x(ACCESS.)S 218 x(If)S 218 x(Enabled)S 219 x
(\(Down\),)S 231 x(permits)S 218 x(V)S -55 x(AXen)S 218 x(on)S 219 x
(the)S 598 y 6888 X(LB100')S -19 x(s)S 277 x("A")S 277 x(side)S 277 x
(to)S 278 x(affect)S 277 x(the)S 278 x(bridge)S 279 x(with)S 277 x
(RBMS)S 277 x(commands,)S 306 x(or)S 597 y 6888 X(Downline)S 231 x
(load)S 232 x(it)S 231 x(with)S 232 x(L)S -27 x(TM.)S 232 x(If)S
232 x(Disabled)S 230 x(\(up\),)S 249 x(RBMS)S 231 x(can)S 233 x
(examine)S 598 y 6888 X(bridge)S 166 x(parameters,)S 166 x(but)S
166 x(not)S 167 x(change)S 167 x(them.)S 897 y 5991 X(\201)S 595 x
(#4)S 166 x(-)S 166 x(PORT)S 165 x(B)S 166 x(ACCES)S -2 x(S.)S 167 x
(Same)S 166 x(as)S 165 x(above,)S 167 x(but)S 166 x(for)S 167 x
(port)S 166 x(B.)S 896 y 5991 X(\201)S 595 x(#5)S 227 x(-)S 228 x
(DOWN)S 226 x(LINE)S 227 x(LOAD.)S 227 x(If)S 228 x(Enabled)S 227 x
(\(down\),)S 243 x(forces)S 228 x(the)S 228 x(LB100)S 227 x(to)S
598 y 6888 X(boot)S 171 x(up)S 172 x(and)S 171 x(request)S 172 x(a)S
171 x(Downline)S 171 x(load)S 172 x(\(L)S -27 x(TM\)-)S 171 x(It)S
171 x(CANNOT)S 171 x(work)S 171 x(as)S 171 x(a)S 598 y 6888 X
(bridge)S 150 x(with)S 149 x(switch)S 149 x(5)S 149 x(down.)S 217 x
(Instead)S 149 x(of)S 149 x(using)S 151 x(swit)S -2 x(ch)S 151 x(5,)S
153 x(the)S 150 x(bridge)S 150 x(can)S 598 y 6888 X(be)S 166 x
(con\211gu)S 2 x(red)S 166 x(to)S 166 x(Downline)S 165 x(load)S 166 x
(with)S 166 x(RBMS,)S 166 x(if)S 166 x(available.)S 896 y 5991 X
(\201)S 595 x(#6)S 166 x(-)S 166 x(Not)S 165 x(used.)S 897 y 5991 X
(The)S 167 x(DEF)S -38 x(AUL)S -27 x(T)S 166 x(switch)S 166 x
(con\211gur)S 2 x(ation)S 166 x(is)S 165 x(3)S 166 x(&)S 166 x(4)S
166 x(DOWN,)S 166 x(all)S 165 x(others)S 166 x(UP)S -64 x(.)S 20413 Y
4796 X F36(2.2.3.2)S 250 x(LAN)S 166 x(Bridge)S 166 x(100)S 166 x
(LED')S -18 x(s)S 22207 Y 5991 X F151(The)S 167 x(5)S 166 x(LED')S
-20 x(s)S 166 x(on)S 167 x(the)S 166 x(LB100,)S 166 x(from)S 166 x
(left)S 166 x(to)S 166 x(right:)S 896 y 5991 X(\201)S 595 x(Port)S
166 x(A)S 166 x(Activity)S 166 x(-)S 166 x(Indicates)S 165 x
(Ethernet)S 167 x(activity)S 166 x(on)S 167 x(Port)S 166 x(A.)S 897 y
5991 X(\201)S 595 x(On-Line)S 187 x(-)S 187 x(If)S 186 x(on)S 187 x
(Solid,)S 192 x(indicates)S 187 x(unit)S 187 x(is)S 186 x
(functionin)S 2 x(g)S 187 x(as)S 186 x(a)S 187 x(bridge,)S 193 x
(and)S 598 y 6888 X(forwarding)S 185 x(packets.)S 279 x(If)S 184 x
(\212ashing)S 186 x(1/second,)S 191 x(bridge)S 185 x(is)S 185 x
(acting)S 185 x(as)S 185 x(a)S 185 x(L)S -27 x(TM)S 598 y 6888 X
(listener)S -37 x(.)S 211 x(If)S 134 x(\212ashing)S 135 x(every)S
135 x(2)S 134 x(seconds,)S 141 x(indictes)S 133 x(the)S 135 x
(bridge)S 134 x(is)S 134 x(succesfully)S 597 y 6888 X(loaded)S 242 x
(as)S 242 x(an)S 243 x(L)S -27 x(TM)S 242 x(listener)S -37 x(.)S
451 x(If)S 243 x(off,)S 261 x(the)S 243 x(LB100)S 242 x(is)S 242 x
(in)S 243 x(the)S 242 x(initialize,)S 598 y 6888 X(preforwarding,)S
143 x(backup,)S 144 x(or)S 137 x(broken)S 138 x(state,)S 143 x(or)S
137 x(in)S 137 x(the)S 137 x(process)S 136 x(of)S 137 x(downline)S
598 y 6888 X(loading)S 166 x(L)S -27 x(TM)S 167 x(software,)S 165 x
(which)S 167 x(can)S 166 x(take)S 167 x(up)S 166 x(to)S 166 x(2)S
166 x(minutes.)S 896 y 5991 X(\201)S 595 x(DC)S 165 x(OK)S 165 x(-)S
166 x(Should)S 166 x(be)S 167 x(on)S 166 x(solid,)S 166 x
(indicating)S 167 x(power)S 166 x(OK.)S 29901 Y 4796 X F152(2\20318)S
498 x(Linking)S 167 x(Ethernet)S 167 x(Segmen)S 2 x(ts)S
PP
EP
%%DOC$Page: 2-19 41
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(\201)S 595 x(Self)S 143 x(T)S -45 x(est)S 143 x
(OK)S 143 x(-)S 143 x(If)S 144 x(on)S 144 x(solid,)S 148 x(passed)S
143 x(self)S 143 x(test.)S 214 x(If)S 143 x(\212ashing,)S 150 x
(NVRAM)S 143 x(failed)S 598 y 6888 X(self)S 165 x(test.)S 221 x(If)S
166 x(off,)S 166 x(Self)S 166 x(T)S -46 x(est)S 166 x(in)S 166 x
(progress.)S 897 y 5991 X(\201)S 595 x(Port)S 166 x(B)S 166 x
(Activity)S 166 x(-)S 166 x(Indicates)S 165 x(Ethernet)S 167 x
(activity)S 166 x(on)S 167 x(Port)S 166 x(B.)S 6659 Y 4796 X F36
(2.2.3.3)S 250 x(LAN)S 166 x(Bridge)S 166 x(100)S 166 x(Power-up)S
167 x(Sequence)S 8453 Y 5991 X F151(The)S 167 x(LB100)S 166 x(has)S
166 x(6)S 166 x(potential)S 165 x(states:)S 896 y 5991 X(\201)S 595 x
(SELF-TEST)S 193 x(-)S 194 x(1st.)S 304 x(state)S 193 x(after)S 193 x
(power)S 194 x(up.)S 305 x(The)S 195 x(LB100)S 193 x(tests)S 193 x
(memory)S -55 x(,)S 598 y 6888 X(MC68000)S 149 x(functionality)S
-55 x(,)S 153 x(and)S 150 x(Ethernet)S 149 x(port)S 149 x(Loopback.)S
217 x(If)S 149 x(the)S 149 x(bridge)S 150 x(is)S 598 y 6888 X(a)S
166 x(DEBE)S -2 x(T)S -45 x(-RC,)S 165 x(the)S 167 x(\211ber)S 166 x
(optic)S 166 x(port)S 166 x(is)S 166 x(NOT)S 165 x(tested)S 166 x
(for)S 166 x(loopback.)S 896 y 5991 X(\201)S 595 x(BROK)S -2 x(EN)S
208 x(-)S 209 x(If)S 209 x(any)S 209 x(self)S 209 x(test)S 208 x
(failures)S 208 x(are)S 209 x(detected.)S 350 x(In)S 209 x(the)S
209 x(BROKE)S -2 x(N)S 598 y 6888 X(state,)S 265 x(SELF)S 246 x
(TEST)S 246 x(will)S 245 x(be)S 246 x(re-run)S 247 x(every)S 248 x
(15)S 246 x(seconds.)S 461 x(An)S 246 x(NVRAM)S 598 y 6888 X
(failure)S 163 x(will)S 162 x(NOT)S 163 x(cause)S 163 x(the)S 164 x
(bridge)S 163 x(to)S 163 x(enter)S 164 x(the)S 163 x(BROK)S -2 x(EN)S
163 x(state)S 162 x(if)S 163 x(the)S 598 y 6888 X(NVRAM)S 165 x
(RESET)S 165 x(switch)S 165 x(is)S 166 x(enabled.)S 896 y 5991 X
(\201)S 595 x(INITIALIZA)S -29 x(TION)S 152 x(-)S 152 x(The)S 152 x
(LB100)S 152 x(sets)S 151 x(up)S 152 x(counters)S 152 x(and)S 152 x
(loads)S 152 x(registers,)S 598 y 6888 X(initializes)S 196 x(his)S
197 x(LANCE)S 196 x(chips,)S 205 x(etc.)S 316 x(It)S 196 x(is)S 197 x
(at)S 197 x(this)S 196 x(time)S 197 x(that)S 197 x(the)S 197 x
(LB100)S 598 y 6888 X(also)S 183 x(determines)S 184 x(whether)S 185 x
(or)S 184 x(not)S 184 x(to)S 184 x(Downline)S 184 x(Load,)S 189 x
(based)S 184 x(on)S 185 x(Switch)S 598 y 6888 X(#5,)S 166 x(or)S
166 x(a)S 166 x(\212ag)S 167 x(in)S 167 x(NVRAM)S 165 x(set)S 165 x
(by)S 167 x(RBMS.)S 896 y 5991 X(\201)S 595 x(PREFOR)S -20 x(W)S
-46 x(ARDING)S 271 x(-)S 273 x(If)S 272 x(the)S 273 x(LB100)S 273 x
(isn')S -10 x(t)S 273 x(broken,)S 301 x(and)S 273 x(doesn')S -10 x
(t)S 273 x(get)S 598 y 6888 X(downline)S 224 x(loaded,)S 238 x(he)S
224 x(enters)S 224 x(the)S 224 x(PREFOR)S -19 x(W)S -47 x(ARDING)S
222 x(state.)S 394 x(At)S 224 x(this)S 598 y 6888 X(time,)S 183 x
(the)S 180 x(LB100)S 180 x(uses)S 180 x(STP)S 180 x(\(protocol)S
180 x(type)S 181 x(80-38\))S 179 x(to)S 180 x(determine)S 180 x(if)S
180 x(he')S -18 x(s)S 597 y 6888 X(the)S 189 x(Root)S 190 x(bridge,)S
196 x(and)S 190 x(whether)S 190 x(or)S 189 x(not)S 190 x(he')S -18 x
(s)S 189 x(con\211gu)S 2 x(red)S 189 x(in)S 190 x(a)S 190 x(Loop)S
190 x(with)S 598 y 6888 X(another)S 212 x(bridge.)S 359 x(If)S 212 x
(he')S -19 x(s)S 212 x(the)S 211 x(loser)S 212 x(in)S 212 x(a)S 211 x
(loop)S 212 x(war)S 211 x(\(as)S 212 x(described)S 211 x(in)S 212 x
(an)S 598 y 6888 X(earlier)S 235 x(section\),)S 252 x(he)S 235 x
(goes)S 235 x(into)S 235 x(BACK)S -2 x(UP)S -64 x(.)S 236 x(If)S
234 x(he)S 235 x(is)S 234 x(to)S 235 x(be)S 235 x(an)S 235 x(ACTIVE)S
598 y 6888 X(bridge,)S 124 x(he)S 114 x(spends)S 113 x(about)S 113 x
(30)S 113 x(seconds)S 113 x(just)S 114 x(LISTENING)S 112 x(to)S 113 x
(traf)S
(\211c)S 113 x(on)S 114 x(both)S 597 y 6888 X(his)S 137 x(A)S 136 x
(and)S 138 x(B)S 136 x(ports.)S 212 x(He)S 137 x(uses)S 137 x(the)S
137 x(SOURCE)S 135 x(addresses)S 136 x(in)S 138 x(the)S 137 x
(packets)S 137 x(he)S 598 y 6888 X(hears)S 149 x(to)S 150 x(build)S
149 x(his)S 150 x(NODE)S 148 x(ADDR)S -2 x(ESS)S 149 x(T)S -27 x
(ABLES.)S 149 x(The)S 150 x(reason)S 150 x(he)S 150 x(spends)S 598 y
6888 X(this)S 214 x(time)S 215 x(LISTENING,)S 214 x(but)S 215 x(not)S
216 x(FOR)S -19 x(W)S -46 x(ARD)S -2 x(ING,)S 215 x(is)S 215 x(so)S
214 x(that)S 215 x(once)S 216 x(he)S 598 y 6888 X(does)S 215 x
(start)S 216 x(forwarding,)S 229 x(he'll)S 216 x(know)S 216 x(which)S
216 x(ports)S 216 x(the)S 216 x(most)S 215 x("talkative")S 598 y
6888 X(nodes)S 236 x(are)S 237 x(on.)S 433 x(If)S 236 x(the)S 237 x
(LB100)S 236 x(didn')S -9 x(t)S 236 x(spend)S 236 x(this)S 236 x
(time)S 236 x(listening,)S 255 x(and)S 597 y 6888 X(started)S 293 x
(forwarding)S 294 x(immediately)S -56 x(,)S 326 x(he)S 294 x(would)S
294 x(have)S 294 x(to)S 294 x(forward)S 293 x(ALL)S 598 y 6888 X
(packets)S 246 x(from)S 247 x(one)S 247 x(side)S 246 x(to)S 246 x
(the)S 247 x(other)S -37 x(,)S 267 x("Flooding")S 247 x(the)S 247 x
(LAN,)S 247 x(until)S 247 x(he)S 598 y 6888 X(learned)S 124 x(which)S
123 x(nodes)S 124 x(were)S 123 x(on)S 124 x(which)S 123 x(ports.)S
208 x(So,)S 132 x(this)S 123 x("Listening")S 124 x(time)S 123 x(is)S
598 y 6888 X(designed)S 118 x(to)S 118 x(prevent)S 118 x("Flooding")S
119 x(and)S 118 x(forwarding)S 118 x(of)S 118 x(unecessary)S 119 x
(packets.)S 597 y 6888 X(After)S 165 x(about)S 166 x(30)S 166 x
(seconds)S 166 x(the)S 167 x(LB100)S 165 x(enters)S 166 x(the)S 167 x
(FOR)S -19 x(W)S -46 x(ARD)S -2 x(ING)S 166 x(state.)S 897 y 5991 X
(\201)S 595 x(FOR)S -19 x(W)S -46 x(ARD)S -2 x(ING)S 212 x(-)S 212 x
(This)S 212 x(is)S 212 x(the)S 212 x(normal)S 213 x(state)S 211 x
(for)S 213 x(the)S 212 x(LB100)S 212 x(we)S 212 x(know)S 598 y 6888 X
(and)S 189 x(love.)S 293 x(As)S 189 x(with)S 189 x(the)S 189 x
(PREFOR)S -19 x(W)S -46 x(ARD)S -2 x(ING)S 189 x(state,)S 195 x(the)S
190 x(LB100)S 189 x(can)S 190 x(go)S 597 y 6888 X(to)S 166 x(the)S
166 x(BACK)S -2 x(UP)S 167 x(state)S 165 x(if)S 166 x(a)S 166 x
(Loop)S 166 x(is)S 166 x(detected.)S 29901 Y 14833 X F152(Linking)S
167 x(Ethernet)S 167 x(Segmen)S 2 x(ts)S 498 x(2\20319)S
PP
EP
%%DOC$Page: 2-20 42
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(\201)S 595 x(BACK)S -2 x(UP)S 221 x(-)S 220 x
(The)S 222 x(LB100)S 220 x(goes)S 221 x(into)S 221 x(BACK)S -2 x(UP)S
221 x(if)S 221 x(Loop)S 221 x(detection)S 220 x(crite-)S 598 y 6888 X
(ria)S 201 x(are)S 201 x(met.)S 326 x(While)S 201 x(in)S 201 x(BACK)S
-2 x(UP)S -64 x(,)S 202 x(if)S 201 x(the)S 201 x(Loop)S 201 x
(detection)S 201 x(criteria)S 201 x(goes)S 598 y 6888 X(away)S 210 x
(\(primary)S 211 x(bridge)S 211 x(dies\),)S 221 x(the)S 210 x(LB100)S
211 x(will)S 209 x(go)S 211 x(back)S 211 x(into)S 210 x(the)S 211 x
(PRE-)S 598 y 6888 X(FOR)S -19 x(W)S -46 x(ARD)S -2 x(ING)S 166 x
(state.)S 6958 Y 4796 X F28(2.2.4)S 300 x(A)S 199 x(brief)S 199 x
(RBMS)S 198 x(Digression)S 8751 Y 5991 X F151(RBMS)S 247 x(\(Remote)S
246 x(Bridge)S 248 x(Management)S 248 x(Software\))S 246 x(is)S 247 x
(an)S 247 x(optional)S 248 x(layered)S 598 y 5991 X(software)S 165 x
(product)S 167 x(available)S 166 x(for)S 166 x(VMS.)S 166 x(Using)S
167 x(RBMS,)S 165 x(it)S 166 x(is)S 166 x(possible)S 165 x(to:)S
897 y 5991 X(\201)S 595 x(Collect)S 165 x(status)S 165 x(and)S 167 x
(counter)S 167 x(information)S 166 x(from)S 166 x(LAN)S 166 x
(Bridge)S 166 x(100')S -19 x(s.)S 896 y 5991 X(\201)S 595 x(Control)S
166 x(the)S 166 x(Spanning)S 167 x(T)S -30 x(ree)S 166 x(Attributes)S
165 x(of)S 166 x(a)S 166 x(LAN)S 166 x(Bridge)S 166 x(100.)S 897 y
5991 X(\201)S 595 x(T)S -35 x(urn)S 166 x(ports)S 166 x(on)S 167 x
(and)S 166 x(off)S 166 x(an)S 166 x(a)S 166 x(LAN)S 166 x(Bridge)S
166 x(100.)S 897 y 5991 X(\201)S 595 x(Filter)S 166 x(speci\211c)S
166 x(Destination)S 165 x(addresses)S 166 x(on)S 166 x(a)S 166 x
(LAN)S 166 x(Bridge)S 166 x(100.)S 896 y 5991 X(\201)S 595 x(T)S
-35 x(urn)S 166 x(a)S 166 x(LAN)S 166 x(Bridge)S 167 x(100)S 166 x
(into)S 166 x(a)S 166 x(L)S -27 x(TM)S 166 x(listener)S -37 x(,)S
167 x(then)S 166 x(reboot)S 166 x(it.)S 897 y 5991 X(And)S 114 x
(much)S 115 x(more.)S 205 x(RBMS)S 113 x(DOES)S 112 x(NOT)S 114 x
(work)S 114 x(on)S 115 x(T)S -31 x(ranslans-)S 114 x(only)S 115 x
(LAN)S 114 x(Bridge)S 598 y 5991 X(100')S -19 x(s.)S 310 x(The)S
196 x(most)S 195 x(frequent)S 196 x(complaint)S 195 x(about)S 195 x
(RBMS)S 195 x(is)S 195 x(that)S 195 x(the)S 196 x(command)S 598 y
5991 X(interface)S 134 x(is)S 134 x("clumsy",)S 141 x(and)S 134 x
(not)S 135 x(terribly)S 134 x(user)S -8 x(-friendly)S -55 x(.)S 211 x
(I)S 134 x(won')S -10 x(t)S 134 x(try)S 135 x(to)S 134 x(go)S 134 x
(over)S 597 y 5991 X(RBMS)S 131 x(commands)S 131 x(here,)S 139 x
(but)S 132 x(it')S -19 x(s)S 131 x(strongly)S 132 x(advised)S 131 x
(that)S 131 x(you)S 132 x(grab)S 132 x(the)S 132 x(RBMS)S 598 y
5991 X(User)S 166 x(Guide,)S 166 x(and)S 167 x(play)S 166 x(with)S
166 x(it)S 165 x(when)S 167 x(you)S 167 x(get)S 166 x(a)S 166 x
(chance.)S 29901 Y 4796 X F152(2\20320)S 498 x(Linking)S 167 x
(Ethernet)S 167 x(Segmen)S 2 x(ts)S
PP
EP
%%DOC$Page: 3-1 43
1000 BP 39600 30600 PM 0 0 XY
10574 Y 4796 X F20(Chapte)S -2 x(r)S 897 x(3)S 349 y 4796 X
17928 24 R 11922 Y 4796 X(The)S 298 x(V)S -16 x(italink)S 298 x(T)S
-50 x(ranslan)S 297 x(bridge)S 14015 Y 4796 X F24(3.1)S 348 x(When)S
232 x(the)S 233 x(going)S 233 x(gets)S 232 x(W)S -12 x(eird,)S 232 x
(the)S 233 x(W)S -13 x(eird)S 233 x(turn)S 233 x(Pro...)S 15808 Y
5991 X F151(This)S 208 x(chapter)S 208 x(will)S 207 x(provide)S 208 x
(an)S 208 x(overview)S 208 x(of)S 208 x(WHA)S -29 x(T)S 208 x(the)S
208 x(V)S -22 x(italink)S 208 x(T)S -31 x(ranslan)S 598 y 5991 X
(bridge)S 202 x(can)S 201 x(do,)S 211 x(and)S 201 x(WHY)S -56 x(.)S
202 x(For)S 201 x(those)S 201 x(of)S 201 x(you)S 202 x(who)S 201 x
(haven)S 2 x(')S -10 x(t)S 201 x(yet)S 202 x(been)S 201 x(intro-)S
597 y 5991 X(duced)S 179 x(to)S 178 x(the)S 178 x(V)S -22 x(italink)S
178 x(command)S 178 x(syntax,)S 182 x(don')S -9 x(t)S 178 x(worry-)S
179 x(you)S 179 x(can)S 178 x(put)S 179 x(THA)S -28 x(T)S 598 y
5991 X(dread)S 162 x(occasion)S 161 x(off)S 162 x(for)S 161 x(a)S
162 x(while)S 161 x(longer)S -36 x(.)S 220 x(I)S 162 x(will)S 160 x
(NOT)S 162 x(be)S 161 x(discussing)S 162 x(explicitly)S 598 y 5991 X
(HOW)S 195 x(to)S 195 x(make)S 196 x(a)S 196 x(T)S -31 x(ranslan)S
196 x(do)S 196 x(things,)S 204 x(just)S 196 x(let)S 196 x(you)S 196 x
(know)S 196 x(the)S 196 x(things)S 196 x(that)S 598 y 5991 X(CAN)S
165 x(be)S 166 x(done.)S 19992 Y 4796 X F28(3.1.1)S 300 x(T)S -33 x
(ranslan)S 201 x(Overview)S 21785 Y 5991 X F151(The)S 209 x(V)S -22 x
(italink)S 209 x(T)S -31 x(ranslan)S 209 x(bridge)S 209 x(performs)S
208 x(many)S 209 x(of)S 209 x(the)S 209 x(same)S 208 x(functions)S
209 x(as)S 598 y 5991 X(the)S 166 x(LAN)S 166 x(Bridge)S 166 x(100.)S
897 y 5991 X(\201)S 595 x(It)S 165 x(forwards)S 166 x(packets)S 166 x
(from)S 166 x(one)S 166 x(Ethernet)S 166 x(segment)S 167 x(to)S 166 x
(another)S -37 x(.)S 896 y 5991 X(\201)S 595 x(Only)S 217 x(packets)S
216 x(which)S 217 x(NEED)S 215 x(to)S 217 x(be)S 216 x(forwarded)S
216 x(ARE)S 216 x(forwarded-)S 216 x(Local)S 598 y 6888 X(traf\211c)S
166 x(is)S 166 x(kept)S 166 x(local.)S 897 y 5991 X(\201)S 595 x(It)S
235 x(participates)S 236 x(in)S 236 x(Spanning)S 238 x(T)S -31 x
(ree)S 236 x(Protocol)S 237 x(\(80-38\))S 236 x(along)S 237 x(with)S
235 x(LAN)S 598 y 6888 X(Bridge)S 165 x(100')S -19 x(s,)S 166 x(to)S
165 x(elect)S 165 x(a)S 166 x(Root)S 165 x(Bridge,)S 166 x(and)S
166 x(to)S 165 x(detect)S 165 x(and)S 165 x(preven)S 2 x(t)S 165 x
(loops)S 597 y 6888 X(in)S 166 x(the)S 166 x(extended)S 167 x(LAN.)S
897 y 5991 X(\201)S 595 x(It)S 165 x(has)S 166 x(\212ashing)S 167 x
(lights)S 166 x(on)S 167 x(the)S 166 x(front)S 166 x(panel.)S 29901 Y
14660 X F152(The)S 166 x(V)S -31 x(italink)S 166 x(T)S -44 x
(ranslan)S 167 x(bridge)S 499 x(3\2031)S
PP
EP
%%DOC$Page: 3-2 44
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(The)S 167 x(T)S -31 x(ranslan)S 167 x(differs)S
165 x(from)S 166 x(the)S 166 x(LB100)S 166 x(in)S 166 x(two)S 166 x
(MAJOR)S 165 x(respects:)S 897 y 5991 X(\201)S 595 x(A)S 181 x(T)S
-30 x(ranslan)S 182 x(bridge)S 183 x(is)S 182 x(usually)S 183 x
(used)S 182 x(to)S 182 x(link)S 182 x(Ethernet)S 183 x(segments)S
182 x(which)S 598 y 6888 X(are)S 123 x(more)S 124 x(than)S 124 x
(4.5)S 124 x(miles)S 123 x(apart)S 123 x(\(4.5)S 124 x(miles)S 122 x
(is)S 123 x(the)S 124 x(limit)S 123 x(of)S 123 x(the)S 124 x
(Metrowave)S 598 y 6888 X(bridge.\))S 312 x(A)S 196 x(T)S -46 x
(elco)S 197 x(link)S 196 x(of)S 196 x(some)S 196 x(kind)S 197 x
(\(56K)S 195 x(DDS,)S 196 x(T1,)S 204 x(etc.\))S 312 x(is)S 196 x
(typically)S 597 y 6888 X(used)S 166 x(to)S 166 x(link)S 166 x
(different)S 166 x(segments.)S 897 y 5991 X(\201)S 595 x(A)S 227 x
(T)S -31 x(ranslan)S 228 x(bridge)S 229 x(can)S 228 x(be)S 227 x
(multiported,)S 244 x(linking)S 229 x(MORE)S 226 x(than)S 228 x
(just)S 228 x(2)S 598 y 6888 X(segments)S 166 x(together)S -37 x(.)S
9947 Y 5991 X(In)S 277 x(addition,)S 305 x(with)S 276 x(the)S 277 x
(exception)S 278 x(of)S 276 x(the)S 277 x(T)S -30 x(ranslan)S 277 x
(IV)S 276 x(model,)S 305 x(T)S -31 x(ranslan)S 598 y 5991 X(bridges)S
150 x(permit)S 150 x(much)S 150 x(more)S 151 x(complex)S 150 x
(\211ltering)S 151 x(capabilities)S 149 x(than)S 150 x(the)S 150 x
(LB100)S 597 y 5991 X(\(Which)S 130 x(can)S 130 x(only)S 130 x(look)S
130 x(at)S 129 x(the)S 130 x(DESTINA)S -29 x(TION)S 129 x(\211eld)S
130 x(of)S 129 x(the)S 130 x(Ethernet)S 130 x(packet.\))S 598 y
5991 X(The)S 281 x(T)S -31 x(ranslan)S 281 x(IV)S 279 x(is)S 279 x
(a)S 280 x("stripped)S 280 x(down")S 279 x(version)S 281 x(of)S 280 x
(the)S 280 x(T)S -30 x(ranslan,)S 309 x(and)S 598 y 5991 X(has)S
253 x(NO)S 253 x(\211ltering)S 254 x(capabilities.)S 483 x(T)S -30 x
(ranslan)S 253 x(III)S 253 x(or)S 253 x(350)S 254 x(bridges)S 253 x
(can)S 254 x(make)S 598 y 5991 X(Filtering/F)S 2 x(orwarding)S 245 x
(decisions)S 245 x(based)S 244 x(upon)S 246 x(ANY)S 244 x(\211eld)S
245 x(of)S 245 x(the)S 245 x(Ethernet)S 597 y 5991 X(packet:)S 222 x
(Destination,)S 166 x(Source,)S 167 x(T)S -25 x(ype,)S 167 x(even)S
167 x(the)S 166 x(Data)S 165 x(\211eld.)S 14729 Y 4796 X F28(3.1.2)S
300 x(W)S -11 x(ould)S 200 x(you..)S 267 x(Could)S 200 x(you..)S
267 x(W)S -11 x(on't)S 200 x(you)S 200 x(be)S 200 x(my)S 200 x
(neighb)S 2 x(or?)S 16522 Y 5991 X F151(Let')S -19 x(s)S 189 x(take)S
188 x(a)S 189 x(look)S 189 x(at)S 188 x(the)S 189 x(typical)S 189 x
(T)S -31 x(ranslan)S 189 x(bridge.)S 290 x(ALL)S 189 x(T)S -31 x
(ranslan)S 189 x(bridges)S 598 y 5991 X(have)S 187 x(only)S 187 x(1)S
186 x(Ethernet)S 186 x(port,)S 192 x(as)S 186 x(opposed)S 185 x(to)S
186 x(the)S 187 x(LB100,)S 191 x(which)S 187 x(always)S 185 x(has)S
598 y 5991 X(2.)S 214 x("Only)S 144 x(1)S 144 x(Ethernet)S 144 x
(port?")S 144 x(I)S 143 x(hear)S 145 x(you)S 144 x(cry)S -54 x(.)S
214 x("What)S 144 x(good)S 144 x(is)S 143 x(a)S 144 x(BRIDG)S -2 x
(E)S 144 x(with)S 598 y 5991 X(1)S 146 x(port?")S 147 x(Ah,)S 151 x
(but)S 146 x(the)S 147 x(T)S -31 x(ranslan)S 147 x(DOES)S 145 x
(have)S 148 x(more)S 146 x(than)S 147 x(1)S 147 x(port-)S 146 x(it)S
146 x(just)S 147 x(has)S 146 x(1)S 597 y 5991 X(ETHERNET)S 185 x
(port.)S 280 x(It)S 185 x(will)S 184 x(always)S 185 x(have)S 187 x
(at)S 185 x(least)S 185 x(1)S 185 x(other)S 186 x(communications)S
598 y 5991 X(port,)S 217 x(either)S 208 x(a)S 206 x(V)S -64 x
(.35/RS449)S 207 x(port)S 206 x(or)S 207 x(a)S 207 x(Specialized)S
206 x(T)S -45 x(-1)S 206 x(port)S 207 x(called)S 207 x(a)S 207 x
(DS-1.)S 598 y 5991 X(\(Y)S -56 x(ou)S 215 x(can)S 214 x(also)S 214 x
(get)S 214 x(them)S 214 x(from)S 214 x(V)S -23 x(italink)S 214 x
(with)S 214 x(RS-232)S 213 x(ports,)S 226 x(but)S 214 x(we)S 213 x
(don')S -9 x(t)S 598 y 5991 X(support)S 166 x(them.\))S 222 x(Let')S
-19 x(s)S 166 x(look)S 166 x(at)S 166 x(a)S 166 x(BASIC)S 165 x(T)S
-31 x(ranslan)S 166 x(con\211g)S 2 x(uration:)S 29901 Y 4796 X F152
(3)S
(\2032)S 498 x(The)S 166 x(V)S -31 x(italink)S 166 x(T)S -44 x
(ranslan)S 167 x(bridge)S
PP
EP
%%DOC$Page: 3-3 45
1000 BP 39600 30600 PM 0 0 XY
3975 Y 5991 X F36(Figu)S 2 x(re)S 165 x(3\2031:)S 498 x(Example)S
167 x(of)S 166 x(a)S 166 x(BASIC)S 166 x(T)S -27 x(ranslan)S 167 x
(con)S
(\211gu)S 2 x(ration)S 5353 Y 8681 X F98(VAX)S 269 x(A)S 15944 X
(DECserver)S 498 y 8681 X(-----)S 15944 X(---------)S 499 y 9219 X
(|)S 17020 X(|)S 498 y 9219 X(|)S 17020 X(|)S 498 y 8143 X
(#==+++============+++===========+++======#)S 538 x(Segment)S 268 x
(1)S 538 x(\(Tulsa,)S 269 x(Ok.\))S 498 y 13254 X(|)S 498 y -269 x
(|)S 498 y 12178 X(Port)S 269 x(1)S 269 x(\(Ethernet\))S 498 y 10833 X
(Vitalink)S 269 x(Translan)S 269 x(Bridge)S 269 x(#1)S 498 y 12178 X
(Port)S 269 x(2)S 269 x(\(V.35\))S 499 y 13254 X(|)S 498 y -807 x
(Modem)S 498 y -807 x(\\)S 498 y -269 x(/)S 269 x(512)S 269 x(Kb)S
269 x(data)S 269 x(link)S 269 x(\(Telco)S 269 x(line\))S 498 y 13254 X
(\\)S 498 y -269 x(/)S 498 y -807 x(Modem)S 499 y -807 x(|)S 498 y
12447 X(Port)S 269 x(2)S 269 x(\(V.35\))S 498 y 10833 X(Vitalink)S
269 x(Translan)S 269 x(Bridge)S 269 x(#2)S 498 y 12447 X(Port)S 269 x
(1)S 269 x(\(Ethernet\))S 498 y 13254 X(|)S 498 y -269 x(|)S 498 y
7605 X(#=====+++===========+++============+++=======#)S 269 x
(Segment)S 268 x(2)S 538 x(\(Denver,)S 269 x(Co.\))S 498 y 9488 X(|)S
17289 X(|)S 499 y 9488 X(|)S 17289 X(|)S 498 y 8412 X(--------)S
16213 X(---------)S 498 y 8412 X(VAX)S 269 x(B)S 16751 X(VAX)S 269 x
(C)S 20895 Y 5991 X F151(This)S 122 x(con\211gur)S 2 x(ation)S 121 x
(illustrates)S 121 x(the)S 122 x(basic)S 121 x(concept)S 122 x(of)S
121 x(the)S 122 x(T)S -31 x(ranslan-)S 122 x(it)S 121 x(bridges)S
598 y 5991 X(Ethernet)S 157 x(segments)S 157 x(which)S 157 x(are)S
157 x(physically)S 158 x(distant.)S 218 x(Once)S 157 x(the)S 157 x
(T)S -31 x(ranslan)S 157 x(has)S 598 y 5991 X(determined)S 182 x
(that)S 181 x(an)S 182 x(Ethernet)S 181 x(packet)S 182 x(needs)S
182 x(to)S 181 x(be)S 181 x(forwarded)S 182 x(to)S 181 x(a)S 181 x
(remote)S 597 y 5991 X(segment)S 258 x(\(following)S 258 x(the)S
259 x(same)S 257 x(principles)S 258 x(as)S 258 x(a)S 258 x(LB100\),)S
281 x(he)S 259 x(bundles)S 258 x(the)S 598 y 5991 X(complete)S 144 x
(packet,)S 150 x(CRC)S 143 x(and)S 144 x(all,)S 149 x(into)S 145 x
(a)S 144 x(HDLC)S 144 x(frame)S 144 x(which)S 145 x(is)S 144 x(sent)S
144 x(out)S 144 x(port)S 598 y 5991 X(2,)S 166 x(the)S 166 x(serial)S
166 x(port.)S 221 x(At)S 166 x(the)S 165 x(other)S 167 x(end,)S 166 x
(the)S 166 x(receiving)S 168 x(T)S -31 x(ranslan)S 166 x
("Unbundles")S 598 y 5991 X(the)S 117 x(packet)S 116 x(coming)S 117 x
(in)S 117 x(his)S 116 x(Port)S 117 x(2,)S 127 x(and)S 116 x(sends)S
116 x(it)S 116 x(out)S 117 x(Port)S 116 x(1,)S 127 x(onto)S 117 x
(the)S 116 x(Ethernet)S 597 y 5991 X(segment.)S 26873 Y 5991 X(This)S
166 x(is)S 166 x(a)S 166 x(good)S 166 x(time)S 166 x(to)S 166 x
(consider)S 166 x(some)S 166 x(basic)S 166 x(concepts:)S 896 y 5991 X
(\201)S 595 x(The)S 166 x(Ethernet)S 167 x(is)S 165 x(capable)S 166 x
(of)S 166 x(sending)S 167 x(data)S 166 x(at)S 165 x(10)S 166 x
(Megabits)S 167 x(per)S 166 x(second.)S 29901 Y 14660 X F152(The)S
166 x(V)S -31 x(italink)S 166 x(T)S -44 x(ranslan)S 167 x(bridge)S
499 x(3\2033)S
PP
EP
%%DOC$Page: 3-4 46
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(\201)S 595 x(The)S 186 x(fastest)S 185 x(T)S -46 x
(elco)S 187 x(datalink)S 186 x(in)S 186 x(the)S 186 x(U.S.)S 187 x
(is)S 185 x(the)S 187 x(T1)S 186 x(link,)S 192 x(approx.)S 282 x
(1.544)S 598 y 6888 X(Megabits)S 166 x(per)S 166 x(second.)S 897 y
5991 X(\201)S 595 x(Many)S 160 x(T)S -30 x(ranslan)S 159 x(sites)S
159 x(will)S 159 x(use)S 159 x(T)S -45 x(elco)S 159 x(links)S 160 x
(slower)S 159 x(than)S 160 x(T1,)S 161 x(perhaps)S 160 x(as)S 598 y
6888 X(slow)S 165 x(as)S 166 x(56Kb,)S 165 x(since)S 167 x(T1)S 166 x
(is)S 166 x(expensive.)S 896 y 5991 X(\201)S 595 x(Since)S 274 x
(the)S 273 x(Ethernet)S 274 x(is)S 273 x(capable)S 274 x(of)S 273 x
(10)S 273 x(MB/sec.,)S 302 x(and)S 274 x(the)S 274 x(T)S -46 x(elco)S
274 x(link)S 598 y 6888 X(between)S 151 x(segments)S 151 x(will)S
151 x(be)S 151 x(less)S 150 x(than)S 152 x(10)S 151 x(MB/sec.,)S
156 x(The)S 152 x(T)S -31 x(ranslan)S 152 x(bridge)S 598 y 6888 X
(may)S 189 x(not)S 190 x(be)S 189 x(able)S 189 x(to)S 189 x(keep)S
190 x(up)S 190 x(with)S 189 x(the)S 189 x(data)S 189 x(rate,)S 196 x
(and)S 189 x(packets)S 189 x(can)S 190 x(be)S 597 y 6888 X(lost.)S
10545 Y 5991 X(W)S -28 x(e)S 166 x(can)S 167 x(minimize)S 165 x(the)S
167 x(number)S 166 x(of)S 166 x(packets)S 166 x(lost)S 166 x(by:)S
896 y 5991 X(\201)S 595 x(Keeping)S 125 x(the)S 125 x(Ethernet)S
125 x(utilization)S 124 x(\(saturation)S 124 x(of)S 125 x
(bandwidth\))S 124 x(low)S -46 x(.)S 208 x(Here)S 598 y 6888 X(at)S
304 x(the)S 305 x(CSC,)S 304 x(we)S 304 x(typically)S 305 x(see)S
304 x(only)S 305 x(2-5%)S 305 x(utilization)S 304 x(of)S 304 x(our)S
305 x(local)S 598 y 6888 X(segment.)S 896 y 5991 X(\201)S 595 x
(Using)S 112 x(as)S 111 x(HIGH)S 110 x(speed)S 112 x(a)S 111 x(T)S
-46 x(elco)S 112 x(link)S 112 x(as)S 111 x(possible)S 111 x(or)S
112 x(economically)S 112 x(feasible.)S 897 y 5991 X(\201)S 595 x
(Making)S 224 x(the)S 223 x(best)S 222 x(use)S 223 x(of)S 223 x(the)S
223 x(Filtering)S 223 x(options)S 223 x(available)S 223 x(to)S 222 x
(us.)S 393 x(The)S 598 y 6888 X(more)S 225 x(we)S 225 x(\211lter)S
226 x(\(and)S 225 x(don')S -9 x(t)S 225 x(forward)S 225 x(from)S
225 x(the)S 226 x(Ethernet\),)S 241 x(the)S 225 x(less)S 225 x(we)S
598 y 6888 X(send)S 139 x(over)S 141 x(the)S 139 x(Serial)S 140 x
(link,)S 146 x(the)S 139 x(more)S 140 x(bandwidth)S 139 x(available)S
140 x(on)S 140 x(the)S 140 x(serial)S 597 y 6888 X(link)S 166 x(for)S
166 x(NECESSAR)S -20 x(Y)S 166 x(traf\211c.)S 18017 Y 5991 X(For)S
115 x(instance,)S 126 x(if)S 115 x(we)S 114 x(have)S 116 x(a)S 115 x
(Local)S 115 x(Area)S 114 x(V)S -55 x(AXcluster)S 114 x(\(LA)S -56 x
(VC\))S 114 x(on)S 116 x(the)S 115 x(Ethernet,)S 597 y 5991 X(we)S
228 x(don')S -9 x(t)S 228 x(need)S 228 x(to)S 228 x(send)S 228 x
(that)S 228 x(traf\211c)S 228 x(across)S 228 x(the)S 228 x(T)S -30 x
(ranslan)S 228 x(\(LA)S -55 x(VC)S 227 x(is)S 227 x(NOT)S 598 y
5991 X(supportable)S 168 x(across)S 169 x(T)S -31 x(ranslan,)S 170 x
(due)S 169 x(to)S 168 x(timing)S 169 x(delays.\))S 230 x(So)S 168 x
(we)S 168 x(can)S 169 x(\211lter)S 169 x(out)S 598 y 5991 X
(protocol)S 166 x(type)S 167 x(60-07)S 165 x(\(LA)S -55 x(VC\))S
165 x(traf\211c.)S 21603 Y 5991 X(On)S 134 x(some)S 134 x(T)S -31 x
(ranslan)S 135 x(sites,)S 140 x(only)S 135 x(DECs)S -2 x(ervers)S
135 x(will)S 133 x(be)S 135 x(on)S 134 x(the)S 134 x(remote)S 135 x
(segment,)S 598 y 5991 X(so)S 203 x(the)S 204 x(only)S 204 x
(purpose)S 204 x(in)S 204 x(life)S 203 x(the)S 204 x(T)S -31 x
(ranslan)S 204 x(has)S 203 x(is)S 203 x(forwarding)S 204 x(LA)S -27 x
(T)S 203 x(traf\211c.)S 598 y 5991 X(In)S 214 x(this)S 213 x(case,)S
226 x(we)S 213 x(would)S 214 x(want)S 213 x(to)S 213 x(\211lter)S
214 x(out)S 214 x(all)S 213 x(protocol)S 214 x(types)S 214 x(other)S
214 x(than)S 598 y 5991 X(60-04)S 180 x(\(LA)S -28 x(T\),)S 181 x
(and)S 180 x(possibly)S 179 x(60-01)S 180 x(\(MOP\),)S 180 x(if)S
180 x(no)S 180 x(V)S -56 x(AX)S 180 x(was)S 179 x(available)S 180 x
(on)S 180 x(the)S 597 y 5991 X(local)S 120 x(segment)S 120 x(to)S
119 x(Downline)S 120 x(Load)S 120 x(the)S 120 x(DEC)S -2 x(servers.)S
207 x(It')S -19 x(s)S 119 x(always)S 119 x(STRONGL)S -46 x(Y)S 598 y
5991 X(reccomended,)S 164 x(however)S -36 x(,)S 163 x(that)S 162 x
(a)S 161 x(LOCAL)S 161 x(load)S 162 x(host)S 162 x(be)S 161 x
(available,)S 164 x(so)S 161 x(that)S 162 x(we)S 598 y 5991 X(CAN)S
165 x(\211lter)S 167 x(out)S 166 x(60-01.)S 26983 Y 5991 X(In)S 163 x
(summary)S -55 x(,)S 164 x(the)S 163 x("Bandwidt)S -2 x(h")S 163 x
(issue)S 163 x(is)S 162 x(one)S 163 x(of)S 163 x(trying)S 164 x(to)S
162 x(\211t)S 163 x(10)S 163 x(lbs.)S 220 x(of)S 163 x(data)S 598 y
5991 X(into)S 116 x(a)S 115 x(1)S 116 x(lb.)S 204 x(bag.)S 206 x
(The)S 116 x(T)S -45 x(elco)S 115 x(comm)S 116 x(link)S 116 x(can)S
116 x(be)S 115 x(a)S 116 x(BOTTLENECK)S -2 x(,)S 116 x(depending)S
598 y 5991 X(on)S 167 x(the)S 166 x(above)S 166 x(factors.)S 29901 Y
4796 X F152(3\2034)S 498 x(The)S 166 x(V)S -31 x(italink)S 166 x(T)S
-44 x(ranslan)S 167 x(bridge)S
PP
EP
%%DOC$Page: 3-5 47
1000 BP 39600 30600 PM 0 0 XY
4497 Y 5991 X F151(Another)S 162 x(factor)S 162 x(related)S 162 x
(to)S 161 x(link)S 163 x(speed)S 161 x(is)S 161 x(P)S -36 x(ACK)S
-2 x(ET)S 162 x(DELA)S -47 x(Y)S -55 x(.)S 162 x(Some)S 161 x
(protocols)S 597 y 5991 X(were)S 227 x(designed)S 228 x(to)S 227 x
(run)S 228 x(throug)S 2 x(h)S 227 x(links)S 228 x(of)S 227 x
(various)S 228 x(speeds.)S 405 x(DECNET)S 226 x(is)S 227 x(a)S 598 y
5991 X(good)S 229 x(example)S 228 x(of)S 228 x(such)S 229 x(a)S 228 x
(protocol.)S 408 x(DECNE)S -2 x(T)S 229 x(can)S 228 x(be)S 228 x
(con\211g)S 2 x(ured)S 228 x(to)S 228 x(deal)S 598 y 5991 X(with)S
169 x(slow)S 169 x(links)S 170 x(\(Asynchronous)S 170 x(DECNET)S
169 x(through)S 171 x(DZ1)S -28 x(1')S -19 x(s)S 169 x(@1200)S 170 x
(baud)S 170 x(is)S 598 y 5991 X(one)S 119 x(example.\))S 205 x
(Other)S 118 x(protocols,)S 128 x(which)S 119 x(were)S 117 x
(designed)S 119 x(to)S 118 x(run)S 118 x(STRICTL)S -46 x(Y)S 118 x
(on)S 597 y 5991 X(the)S 139 x(LOCAL)S 138 x(Ethernet)S 138 x(LAN,)S
139 x(may)S 139 x(be)S 139 x(less)S 138 x(tolerant)S 138 x(of)S 139 x
(delays)S 138 x(caused)S 139 x(by)S 139 x(slow)S 598 y 5991 X(link)S
177 x(speeds.)S 253 x(LA)S -28 x(T)S 177 x(is)S 176 x(one)S 177 x
(such)S 177 x(protocol.)S 254 x(LA)S -28 x(T)S 177 x(was)S 175 x
(designed)S 177 x(to)S 177 x(run)S 177 x(on)S 177 x(the)S 598 y
5991 X(10)S 180 x(MB/sec.)S 265 x(Ethernet,)S 184 x(and)S 181 x
(there)S 180 x(are)S 181 x(no)S 181 x(adjustable)S 180 x(timers)S
179 x(which)S 181 x(we)S 180 x(can)S 598 y 5991 X(diddle)S 181 x
(with)S 181 x(to)S 182 x(tell)S 181 x(it)S 181 x(that)S 182 x(it')S
-20 x(s)S 182 x(on)S 182 x(a)S 181 x(slower)S 181 x(medium.)S 268 x
(There')S -18 x(s)S 182 x(an)S 181 x(excellent)S 597 y 5991 X
(article)S 203 x(in)S 204 x(the)S 203 x(LA)S -27 x(T)S 203 x(notes)S
203 x(\211le)S 204 x(which)S 203 x(discusses)S 203 x(LA)S -28 x(T)S
204 x(considerations)S 203 x(when)S 598 y 5991 X(runnin)S 2 x(g)S
210 x(over)S 212 x(a)S 210 x(T)S -31 x(ranslan.)S 355 x(In)S 211 x
(general,)S 223 x(1-2)S 210 x(KB)S 209 x(of)S 211 x(serial)S 210 x
(link)S 211 x(bandwidth)S 598 y 5991 X(should)S 277 x(be)S 276 x
(allowed)S 276 x(for)S 276 x(EACH)S 275 x(DECs)S -2 x(erver)S 278 x
(user)S 276 x(going)S 278 x(across)S 276 x(the)S 276 x(link.)S 598 y
5991 X(This)S 225 x(is)S 223 x(in)S 225 x(ADDITIO)S -2 x(N)S 224 x
(to)S 225 x(any)S 225 x(bandwidth)S 224 x(needed)S 225 x(for)S 224 x
(DECNET)S -47 x(,)S 225 x(TCPIP)S -64 x(,)S 597 y 5991 X(or)S 166 x
(whatever)S 167 x(else)S 166 x(might)S 166 x(be)S 166 x(runnin)S
2 x(g)S 166 x(across)S 166 x(the)S 166 x(link.)S 13463 Y 4796 X F28
(3.1.3)S 300 x(In)S 199 x(an)S 200 x(Octopus)S 2 x(')S -22 x(s)S
199 x(garden-)S 201 x(with)S 199 x(you.)S 15256 Y 5991 X F151(The)S
160 x(second)S 160 x(important)S 160 x(attribute)S 159 x(of)S 159 x
(the)S 160 x(T)S -30 x(ranslan)S 160 x(is)S 159 x(that)S 159 x(it)S
160 x(can)S 160 x(have)S 160 x(more)S 598 y 5991 X(than)S 190 x(one)S
190 x("Serial")S 189 x(Port.)S 293 x(In)S 189 x(the)S 190 x
(previous)S 190 x(\211gure)S 2 x(,)S 195 x(we)S 190 x(looked)S 190 x
(at)S 189 x(2)S 189 x(SINGLE)S 598 y 5991 X(PORT)S 157 x(T)S -30 x
(ranslan)S 158 x(bridges,)S 159 x(in)S 158 x(a)S 158 x(BASIC)S 156 x
(con)S
(\211gu)S 2 x(ration.)S 219 x(\(Note:)S 217 x(The)S 159 x(T)S -31 x
(ranslan)S 598 y 5991 X(4)S 177 x(will)S 176 x(AL)S -37 x(W)S -46 x
(A)S -46 x(YS)S 177 x(have)S 178 x(only)S 178 x(1)S 177 x(serial)S
176 x(port-)S 177 x(The)S 178 x(T)S -31 x(ranslan)S 178 x(4)S 177 x
(is)S 176 x(the)S 178 x(Economy)S 597 y 5991 X(model.\))S 216 x(T)S
-31 x(ranslan)S 150 x(III)S 148 x(and)S 149 x(350)S 149 x(bridges)S
150 x(can)S 149 x(have)S 150 x(up)S 150 x(to)S 149 x(8)S 149 x
(serial)S 149 x(ports.)S 215 x(Let')S -18 x(s)S 598 y 5991 X(look)S
210 x(at)S 209 x(a)S 209 x(sample)S 208 x(con\211g)S 2 x(,)S 220 x
(in)S 209 x(which)S 210 x(a)S 209 x(T)S -31 x(ranslan)S 210 x(III)S
208 x(with)S 209 x(2)S 209 x(serial)S 209 x(ports)S 209 x(is)S 598 y
5991 X(talking)S 167 x(to)S 166 x(2)S 166 x(single-port)S 166 x
(bridges:)S 29901 Y 14660 X F152(The)S 166 x(V)S -31 x(italink)S
166 x(T)S -44 x(ranslan)S 167 x(bridge)S 499 x(3\2035)S
PP
EP
%%DOC$Page: 3-6 48
1000 BP 39600 30600 PM 0 0 XY
3975 Y 5991 X F36(Figu)S 2 x(re)S 165 x(3\2032:)S 498 x(Example)S
167 x(of)S 166 x(a)S 166 x(Multi)S 2 x(ported)S 166 x(T)S -27 x
(ranslan)S 167 x(Con\211gu)S 2 x(ration)S 5084 Y 13523 X F98
(#====+++====#)S 538 x(Ethernet)S 269 x(Segment)S 268 x(1)S 499 y
15137 X(|)S 498 y -269 x(|)S 498 y 14330 X(Port)S 269 x(1)S 269 x
(\(Ethernet\))S 498 y 13254 X(Translan)S 269 x(III)S 269 x(\(Bridge)S
269 x(#1\))S 498 y 12447 X(Port)S 269 x(2)S 17289 X(Port)S 269 x(3)S
498 y 12716 X(/)S 17827 X(\\)S 498 y 11640 X(CSU-DSU)S 17289 X
(Modem)S 498 y 11909 X(/)S 18096 X(\\)S 499 y 9757 X(T1)S 269 x
(Link)S 269 x(\\)S 18145 X(/)S 538 x(56)S 269 x(Kb)S 269 x(Telco)S
269 x(Line)S 498 y 11909 X(/)S 18365 X(\\)S 498 y 11371 X(/)S 18634 X
(\\)S 498 y 10564 X(CSU-DSU)S 18903 X(Modem)S 498 y 11102 X(/)S
19441 X(\\)S 498 y 9757 X(Port)S 269 x(2)S 18634 X(Port)S 269 x(2)S
498 y 8143 X(Translan)S 269 x(III)S 269 x(\(Bridge)S 269 x(#2\))S
17289 X(Translan)S 269 x(IV)S 269 x(\(Bridge)S 268 x(#3\))S 499 y
9757 X(Port)S 269 x(1)S 269 x(\(Ethernet\))S 18634 X(Port)S 269 x(1)S
269 x(\(Ethernet\))S 498 y 10295 X(|)S 19441 X(|)S 498 y 10295 X(|)S
19441 X(|)S 498 y 8412 X(#=====+++=====#)S 17827 X(#====+++====#)S
498 y 8950 X(Segment)S 269 x(2)S 18634 X(Segment)S 269 x(3)S 17438 Y
5991 X F151(Remember)S -37 x(,)S 321 x(ALL)S 290 x(T)S -31 x
(ranslan)S 290 x(bridges)S 290 x(LEARN)S 289 x(about)S 290 x
(Ethernet)S 290 x(node)S 291 x(ad-)S 598 y 5991 X(dresses)S 231 x
(the)S 232 x(same)S 231 x(way)S 232 x(that)S 232 x(LAN)S 231 x
(Bridge)S 232 x(100')S -19 x(s)S 232 x(do,)S 248 x(and)S 232 x
(maintain)S 232 x(Node)S 598 y 5991 X(Address)S 218 x(tables)S 218 x
(just)S 219 x(like)S 219 x(the)S 219 x(LB100.)S 379 x(The)S 220 x
(difference)S 219 x(is)S 218 x(that)S 219 x(the)S 218 x(LB100)S 597 y
5991 X(only)S 145 x(needs)S 143 x(to)S 144 x(keep)S 144 x(track)S
144 x(of)S 144 x(2)S 143 x(ports.)S 214 x(A)S 144 x(T)S -31 x
(ranslan)S 144 x(might)S 144 x(need)S 144 x(to)S 144 x(keep)S 144 x
(track)S 598 y 5991 X(of)S 166 x(as)S 166 x(many)S 166 x(as)S 166 x
(8)S 166 x(serial)S 166 x(ports)S 165 x(+)S 166 x(1)S 166 x
(Ethernet)S 166 x(port.)S 897 y 5991 X(For)S 172 x(instance,)S 173 x
(Bridge)S 172 x(#1)S 171 x(in)S 172 x(the)S 172 x(above)S 172 x
(\211gure)S 172 x(will)S 171 x(see)S 171 x(all)S 171 x(the)S 172 x
(nodes)S 172 x(on)S 171 x(his)S 598 y 5991 X(ethernet)S 186 x(port)S
186 x(as)S 186 x(being)S 186 x(on)S 187 x(Port)S 186 x(1.)S 281 x
(He)S 186 x(will)S 185 x(see)S 185 x(all)S 186 x(nodes)S 186 x(out)S
186 x(on)S 186 x(segment)S 597 y 5991 X(2)S 218 x(as)S 218 x(being)S
219 x(on)S 219 x(port)S 219 x(2,)S 231 x(and)S 219 x(all)S 218 x
(nodes)S 219 x(on)S 218 x(segment)S 219 x(3)S 218 x(as)S 218 x
(being)S 219 x(on)S 219 x(Port)S 219 x(3.)S 598 y 5991 X(Likewise,)S
153 x(Bridge)S 150 x(#2)S 149 x(will)S 149 x(see)S 149 x(all)S 149 x
(nodes)S 150 x(on)S 149 x(Segment)S 150 x(2)S 150 x(as)S 149 x
(being)S 150 x(on)S 150 x(his)S 149 x(Port)S 598 y 5991 X(1,)S 156 x
(and)S 152 x(all)S 153 x(nodes)S 152 x(on)S 153 x(Segments)S 152 x
(1)S 153 x(and)S 152 x(3)S 153 x(as)S 152 x(being)S 153 x(on)S 153 x
(his)S 152 x(port)S 153 x(2.)S 217 x(Remember)S -37 x(,)S 598 y
5991 X(bridges)S 175 x(don')S -9 x(t)S 174 x(know)S 175 x(how)S 175 x
(far)S 174 x(away)S 175 x(any)S 175 x(node)S 175 x(is,)S 177 x(or)S
175 x(how)S 174 x(many)S 175 x(bridges)S 175 x(are)S 597 y 5991 X
(between)S 134 x(the)S 134 x(node)S 134 x(and)S 134 x(itself.)S 210 x
(The)S 135 x(Bridge)S 134 x(only)S 135 x(knows)S 133 x(WHICH)S 133 x
(port)S 134 x(he)S 134 x(saw)S 598 y 5991 X(a)S 166 x(packet)S 166 x
(come)S 167 x(in)S 166 x(on)S 166 x(with)S 166 x(an)S 166 x(address)S
166 x(in)S 166 x(the)S 166 x(SOURCE)S 165 x(\211eld.)S 222 x(Okay?)S
29901 Y 4796 X F152(3\2036)S 498 x(The)S 166 x(V)S -31 x(italink)S
166 x(T)S -44 x(ranslan)S 167 x(bridge)S
PP
EP
%%DOC$Page: 3-7 49
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Let')S -19 x(s)S 216 x(consider)S 217 x(some)S
216 x(scenarios)S 216 x(from)S 217 x(the)S 216 x(previous)S 217 x
(\211gure,)S 231 x(assuming)S 216 x(that)S 598 y 5991 X(NO)S 166 x
(\211lters)S 166 x(have)S 166 x(been)S 167 x(set)S 165 x(up)S 167 x
(on)S 166 x(the)S 167 x(bridges:)S 897 y 5991 X(\201)S 595 x(A)S
163 x(node)S 163 x(on)S 164 x(Segment)S 164 x(1)S 163 x(sends)S 163 x
(a)S 163 x(packet)S 164 x(to)S 163 x(another)S 164 x(node)S 163 x
(on)S 164 x(Segment)S 164 x(1.)S 598 y 6888 X(Bridge)S 200 x(#1)S
199 x(sees)S 199 x(the)S 200 x(packet,)S 209 x(determines)S 200 x
(both)S 200 x(nodes)S 200 x(are)S 200 x(on)S 200 x(the)S 200 x(same)S
597 y 6888 X(port,)S 166 x(so)S 166 x(he)S 166 x(doesn')S -9 x(t)S
166 x(forward)S 166 x(the)S 166 x(packet)S 166 x(out)S 166 x(either)S
167 x(of)S 166 x(his)S 166 x(serial)S 165 x(ports.)S 897 y 5991 X
(\201)S 595 x(A)S 179 x(node)S 181 x(on)S 180 x(Segment)S 180 x(1)S
180 x(sends)S 180 x(an)S 180 x(ugly)S 182 x(TCPIP)S 180 x(BROA)S
-2 x(DCAST)S 179 x(message.)S 598 y 6888 X(Bridge)S 136 x(#1)S 135 x
(sees)S 136 x(the)S 136 x(BROA)S -2 x(DCAST)S 135 x(destination)S
135 x(address,)S 142 x(so)S 136 x(he)S 136 x(forwards)S 597 y 6888 X
(the)S 166 x(packet)S 166 x(out)S 166 x(BOTH)S 166 x(ports)S 166 x
(2)S 166 x(and)S 166 x(3.)S 897 y 5991 X(\201)S 595 x(A)S 145 x
(node)S 145 x(on)S 146 x(Segment)S 146 x(1)S 145 x(sends)S 145 x(a)S
146 x(packet)S 145 x(to)S 145 x(a)S 146 x(node)S 146 x(on)S 145 x
(Segment)S 146 x(3.)S 215 x(Bridge)S 598 y 6888 X(#1)S 204 x
(examines)S 205 x(the)S 204 x(packet,)S 215 x(sees)S 204 x(that)S
204 x(it')S -19 x(s)S 204 x(going)S 205 x(to)S 204 x(a)S 205 x(node)S
205 x(out)S 204 x(his)S 204 x(port)S 598 y 6888 X(3,)S 183 x(and)S
179 x(forwards)S 178 x(the)S 180 x(packet)S 179 x(out)S 180 x(port)S
179 x(3,)S 182 x(but)S 180 x(NOT)S 179 x(Port)S 179 x(2.)S 261 x
(The)S 180 x(packet)S 597 y 6888 X(arrives)S 154 x(at)S 154 x
(Bridge)S 155 x(#3')S -19 x(s)S 154 x(Port)S 154 x(2,)S 157 x(where)S
154 x(he)S 155 x(examines)S 155 x(it,)S 156 x(then)S 155 x(forwards)S
154 x(it)S 598 y 6888 X(out)S 166 x(his)S 166 x(Port)S 166 x(1.)S
897 y 5991 X(\201)S 595 x(A)S 141 x(node)S 142 x(on)S 143 x(Segment)S
142 x(2)S 142 x(sends)S 141 x(a)S 142 x(Packet)S 143 x(to)S 142 x(a)S
141 x(node)S 143 x(on)S 142 x(Segment)S 142 x(3.)S 214 x(Bridge)S
597 y 6888 X(#2)S 136 x(sees)S 135 x(the)S 137 x(packet)S 136 x
(come)S 136 x(in,)S 143 x(and)S 137 x(sees)S 135 x(the)S 137 x
(Destination)S 135 x(address)S 136 x(belongs)S 598 y 6888 X(to)S
159 x(a)S 160 x(node)S 161 x(out)S 160 x(port)S 159 x(2,)S 162 x(so)S
160 x(he)S 160 x(sends)S 159 x(it)S 160 x(out)S 160 x(port)S 160 x
(2.)S 220 x(It)S 159 x(comes)S 160 x(in)S 160 x(on)S 160 x(Bridge)S
598 y 6888 X(#1')S -19 x(s)S 177 x(Port)S 178 x(2,)S 181 x(where)S
178 x(Bridge)S 178 x(#1)S 178 x(sees)S 177 x(that)S 177 x(it)S 178 x
(belongs)S 178 x(to)S 177 x(a)S 178 x(node)S 178 x(out)S 178 x(Port)S
598 y 6888 X(3.)S 488 x(So)S 255 x(Bridge)S 256 x(#1)S 254 x(sends)S
255 x(it)S 255 x(out)S 255 x(Port)S 255 x(3,)S 278 x(but)S 255 x
(NOT)S 255 x(out)S 255 x(port)S 255 x(1.)S 489 x(The)S 598 y 6888 X
(packet,)S 257 x(weary)S 238 x(with)S 238 x(Jet)S 238 x(Lag,)S 258 x
(arrives)S 238 x(at)S 238 x(Bridge)S 239 x(#3')S -19 x(s)S 238 x
(Port)S 238 x(2,)S 257 x(where)S 597 y 6888 X(it)S 165 x(is)S 166 x
(examined,)S 167 x(then)S 167 x(forwarded)S 165 x(out)S 167 x(Port)S
166 x(1,)S 167 x(the)S 166 x(Ethernet)S 166 x(port.)S 897 y 5991 X
(\201)S 595 x(A)S 184 x(node)S 186 x(on)S 185 x(Segment)S 186 x(3)S
185 x(\(Say)S -56 x(,)S 191 x(a)S 185 x(DECs)S -2 x(erver\))S 186 x
(sends)S 185 x(out)S 185 x(a)S 185 x(MUL)S -27 x(TICAST)S 598 y
6888 X(message)S 264 x(requesting)S 266 x(a)S 265 x(Downline)S 265 x
(load.)S 519 x(Unless)S 264 x(\211ltering)S 266 x(is)S 265 x(set)S
265 x(up,)S 597 y 6888 X(Multicasts)S 178 x(are)S 180 x(treated)S
179 x(like)S 179 x(Broadcasts.)S 260 x(So)S 179 x(the)S 180 x
(packet)S 179 x(goes)S 180 x(out)S 179 x(Port)S 598 y 6888 X(2)S
144 x(to)S 145 x(Bridge)S 145 x(#1,)S 149 x(who)S 145 x(sends)S 144 x
(it)S 145 x(out)S 145 x(both)S 145 x(Ports)S 144 x(1)S 145 x(and)S
145 x(2,)S 149 x(so)S 145 x(it)S 144 x(is)S 145 x("Flooded")S 598 y
6888 X(to)S 166 x(all)S 165 x(segments.)S 222 x(Y)S -55 x(echh!)S
21603 Y 5991 X(The)S 240 x(previous)S 240 x(\211gure)S 240 x
(represents)S 240 x(a)S 239 x("fairly)S 239 x(small")S 238 x
(Extended)S 240 x(LAN.)S 239 x(Large)S 598 y 5991 X(extended)S 267 x
(LANs)S 266 x(may)S 267 x(have)S 267 x(70)S 266 x(or)S 267 x(more)S
266 x(bridges)S 267 x(in)S 266 x(them.)S 523 x(The)S 267 x(SAME)S
598 y 5991 X(RULES)S 282 x(apply)S 283 x(as)S 282 x(illustrated)S
282 x(above.)S 573 x(My)S 284 x(line)S 283 x(editor)S 282 x
(artistic)S 282 x(abilities)S 598 y 5991 X(prevent)S 163 x(me)S 163 x
(from)S 162 x(drawing)S 163 x(such)S 163 x(a)S 162 x(LAN)S 163 x
(here,)S 164 x(however)S -36 x(.)S 221 x(Further)S 163 x(examples)S
597 y 5991 X(of)S 166 x(LARGE)S 165 x(LANs)S 165 x(are)S 167 x
(furnished)S 166 x(in)S 167 x(the)S 166 x(addendum)S 166 x(to)S 166 x
(this)S 166 x(guide.)S 29901 Y 14660 X F152(The)S 166 x(V)S -31 x
(italink)S 166 x(T)S -44 x(ranslan)S 167 x(bridge)S 499 x(3\2037)S
PP
EP
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1000 BP 39600 30600 PM 0 0 XY
4032 Y 4796 X F28(3.1.4)S 300 x(Using)S 200 x(multiple)S 201 x(data)S
200 x(links)S 200 x(betwe)S 2 x(en)S 199 x(segm)S 2 x(ents)S 5825 Y
5991 X F151(Let')S -19 x(s)S 248 x(consider)S 249 x(another)S 249 x
(situation:)S 387 x(Due)S 248 x(to)S 249 x(\211nancial)S 249 x(or)S
249 x(local)S 248 x(Phon)S 2 x(e)S 248 x(Co.)S 598 y 5991 X
(limitations,)S 205 x(the)S 198 x(fastest)S 196 x(line)S 198 x
(speed)S 197 x(available)S 197 x(between)S 198 x(two)S 197 x(sites)S
196 x(is)S 197 x(56Kb.)S 597 y 5991 X(But)S 292 x(the)S 292 x
(amount)S 292 x(of)S 292 x(traf\211c)S 292 x(sent)S 292 x(between)S
291 x(the)S 292 x(sites)S 291 x(necessitates)S 291 x(more)S 598 y
5991 X(through)S 2 x(put)S 116 x(than)S 117 x(a)S 117 x(single)S
117 x(56Kb)S 116 x(link)S 117 x(gives)S 117 x(us.)S 205 x(Look)S
118 x(at)S 116 x(the)S 117 x(following)S 116 x(\211gu)S 2 x(re:)S
29901 Y 4796 X F152(3\2038)S 498 x(The)S 166 x(V)S -31 x(italink)S
166 x(T)S -44 x(ranslan)S 167 x(bridge)S
PP
EP
%%DOC$Page: 3-9 51
1000 BP 39600 30600 PM 0 0 XY
3960 Y 5991 X F36(Figu)S 2 x(re)S 165 x(3\2033:)S 498 x(Example)S
167 x(of)S 166 x(T)S -27 x(ranslan)S 167 x(Parallel)S 168 x(Link)S
167 x(Utilizatio)S 2 x(n)S 5069 Y 13523 X F98(#====+++====#)S 538 x
(Ethernet)S 269 x(Segment)S 268 x(1)S 498 y 15137 X(|)S 498 y -269 x
(|)S 498 y 12447 X(----------------------------------)S 499 y 14330 X
(Port)S 269 x(1)S 269 x(\(Ethernet\))S 498 y 13254 X(Translan)S 269 x
(III)S 269 x(\(Bridge)S 269 x(#1\))S 498 y 12447 X(Port)S 269 x(2)S
17289 X(Port)S 269 x(3)S 19979 X(Port)S 269 x(4)S 498 y 12447 X
(----------------------------------)S 498 y 12716 X(/)S 17827 X(\\)S
20566 X(\\)S 498 y 11640 X(CSU-DSU)S 17289 X(Modem)S 19979 X(Modem)S
498 y 11909 X(/)S 18096 X(\\)S 20835 X(\\)S 498 y 9757 X(T1)S 269 x
(Link)S 269 x(\\)S 18145 X(/)S 538 x(56Kb)S 807 x(/)S 538 x(56Kb)S
499 y 11909 X(/)S 18365 X(\\)S 20835 X(\\)S 498 y 11371 X(/)S 18634 X
(\\)S 21104 X(\\)S 498 y 10564 X(CSU-DSU)S 18903 X(Modem)S 21324 X
(Modem)S 498 y 11102 X(/)S 19441 X(\\)S 21642 X(\\)S 498 y 7605 X
(--------------------------)S 17289 X(-----------------------)S 498 y
9757 X(Port)S 269 x(2)S 18096 X(Port)S 269 x(2)S 807 x(Port)S 269 x
(3)S 498 y 8143 X(Translan)S 269 x(III)S 269 x(\(Bridge)S 269 x
(#2\))S 17289 X(Translan)S 269 x(IV)S 269 x(\(Bridge)S 268 x(#3\))S
498 y 9757 X(Port)S 269 x(1)S 269 x(\(Ethernet\))S 18634 X(Port)S
269 x(1)S 269 x(\(Ethernet\))S 499 y 7605 X
(--------------------------)S 17289 X(-----------------------)S 498 y
10295 X(|)S 19441 X(|)S 498 y 10295 X(|)S 19441 X(|)S 498 y 8412 X
(#=====+++=====#)S 17289 X(#======+++======#)S 498 y 8950 X(Segment)S
269 x(2)S 18096 X(Segment)S 269 x(3)S 19415 Y 5991 X F151(As)S 181 x
(you)S 183 x(can)S 183 x(see,)S 186 x(we)S 182 x(have)S 183 x(two)S
181 x(56Kb)S 181 x(links)S 183 x(between)S 182 x(Segments)S 182 x(1)S
182 x(and)S 182 x(3.)S 270 x(If)S 598 y 5991 X(we)S 201 x(left)S
201 x(these)S 202 x(links)S 202 x("as)S 200 x(is",)S 211 x(we)S 201 x
(would)S 201 x(have)S 203 x(a)S 201 x("Loop")S 202 x(between)S 201 x
(segments,)S 598 y 5991 X(which)S 160 x(is)S 159 x(illegal.)S 220 x
(What)S 159 x(would)S 159 x(then)S 160 x(happen)S 160 x(is)S 159 x
(that)S 160 x(one)S 160 x(link)S 160 x(would)S 159 x(go)S 160 x
(into)S 597 y 5991 X("Backup",)S 163 x(breaking)S 163 x(the)S 162 x
(loop.)S 220 x(If)S 162 x(the)S 162 x("primary")S 161 x(link)S 163 x
(went)S 161 x(down,)S 163 x(the)S 162 x(other)S 598 y 5991 X(link)S
241 x(would)S 240 x(come)S 240 x(out)S 240 x(of)S 240 x("backup",)S
260 x(and)S 240 x(traf\211c)S 240 x(would)S 240 x(still)S 239 x(run)S
241 x(between)S 598 y 5991 X(segments.)S 303 x(This)S 194 x(assures)S
192 x(maximum)S 194 x(link)S 193 x(availablity)S -55 x(,)S 201 x
(but)S 193 x(does)S 193 x(nothing)S 194 x(to)S 598 y 5991 X
(increase)S 166 x(our)S 167 x(through)S 2 x(put)S 166 x(between)S
166 x(segments.)S 24795 Y 5991 X(The)S 114 x(T)S -31 x(ranslan)S
114 x(offers)S 112 x(us)S 113 x(another)S 114 x(choice;)S 132 x(we)S
113 x(can)S 114 x(tell)S 112 x(it)S 113 x(to)S 113 x(use)S 113 x
(BOTH)S 113 x(links,)S 124 x(in)S 598 y 5991 X(parallel,)S 144 x
(splitting)S 138 x(the)S 138 x(traf\211c)S 138 x(between)S 138 x
(links.)S 213 x(W)S -28 x(e)S 138 x(do)S 138 x(this)S 138 x(with)S
137 x("NETWORK)S 598 y 5991 X(GROUPS".)S 29901 Y 14660 X F152(The)S
166 x(V)S -31 x(italink)S 166 x(T)S -44 x(ranslan)S 167 x(bridge)S
499 x(3\2039)S
PP
EP
%%DOC$Page: 3-10 52
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Each)S 166 x(port)S 166 x(on)S 167 x(a)S 166 x(T)S
-31 x(ranslan)S 166 x(bridge)S 167 x(has)S 166 x(an)S 166 x
(associated)S 166 x("Network)S 165 x(Group".)S 5215 Y 4796 X F36(T)S
-37 x(able)S 150 x(3\2031:)S 498 x(T)S -27 x(ranslan)S 150 x
(Network)S 149 x(Group)S 150 x(IDs)S 224 y 4796 X 17928 24 R 598 y
4796 X F157(T)S -29 x(ranslan)S 150 x(Port)S 12367 X(Default)S 151 x
(Network)S 149 x(Group)S 298 y 4796 X 17928 24 R 648 y 4796 X F155
(Port)S 150 x(1)S 149 x(\(Ethernet\))S 12367 X(1)S 897 y 4796 X
(Port)S 150 x(2)S 149 x(\(1st)S 150 x(Serial)S 151 x(Port\))S 12367 X
(2)S 896 y 4796 X(Port)S 150 x(3)S 149 x(\(2nd)S 151 x(Serial)S 150 x
(Port)S
(\))S 12367 X(3)S 897 y 4796 X(Port)S 150 x(4)S 149 x(\(3rd)S 151 x
(Serial)S 150 x(Port\))S 12367 X(4)S 897 y 4796 X(Port)S 150 x(5)S
149 x(\(4th)S 151 x(Serial)S 150 x(Port\))S 12367 X(5)S 398 y 4796 X
17928 24 R 12064 Y 5991 X F151(And)S 136 x(so)S 136 x(on,)S 143 x
(for)S 136 x(ports)S 135 x(6-9,)S 143 x(if)S 136 x(a)S 135 x(second)S
137 x(serial)S 135 x(port)S 136 x(card)S 137 x(is)S 135 x(installed)S
136 x(\(T)S -31 x(ranslan)S 598 y 5991 X(III)S 165 x(and)S 167 x
(350)S 166 x(only)S -55 x(.\))S 14455 Y 5991 X(By)S 271 x
(associating)S 270 x(two)S 270 x(or)S 271 x(more)S 271 x(physical)S
271 x(ports)S 270 x(with)S 271 x(the)S 270 x(SAME)S 270 x(Network)S
598 y 5991 X(Group,)S 192 x(we)S 186 x(tell)S 186 x(the)S 187 x(T)S
-31 x(ranslan)S 187 x(that)S 187 x(we)S 186 x(want)S 186 x(both)S
186 x(ports)S 186 x(to)S 187 x(go)S 187 x(to)S 186 x(the)S 187 x
(same)S 598 y 5991 X(place,)S 182 x(and)S 179 x(both)S 179 x(to)S
178 x(be)S 179 x(used.)S 260 x(Looking)S 180 x(at)S 178 x(\211gur)S
2 x(e)S 178 x(3.3,)S 183 x(if)S 178 x(we)S 179 x(assign)S 178 x
(Network)S 597 y 5991 X(Group)S 171 x(3)S 170 x(to)S 170 x(BOTH)S
170 x(Ports)S 170 x(3)S 171 x(and)S 170 x(4)S 171 x(on)S 171 x(T)S
-31 x(ranslan)S 171 x(#1,)S 172 x(T)S -31 x(ranslan)S 171 x(#1)S
170 x(will)S 170 x(know)S 598 y 5991 X(that)S 236 x(we)S 236 x(want)S
237 x(these)S 236 x(links)S 237 x(to)S 236 x(work)S 237 x(in)S 236 x
(parallel.)S 433 x(W)S -27 x(e)S 236 x(also)S 236 x(need)S 237 x(to)S
236 x(go)S 237 x(to)S 598 y 5991 X(T)S -31 x(ranslan)S 166 x(#3)S
166 x(and)S 166 x(tell)S 166 x(HIM)S 165 x(that)S 166 x(ports)S 165 x
(2)S 166 x(and)S 166 x(3)S 165 x(should)S 166 x(be)S 166 x(used)S
166 x(in)S 166 x(parallel,)S 598 y 5991 X(by)S 167 x(giving)S 167 x
(them)S 166 x(both)S 167 x(Network)S 166 x(Groups)S 165 x(of)S 166 x
(2.)S 19835 Y 5991 X(Note:)S 214 x(In)S 149 x(these)S 150 x
(Examples,)S 153 x(we've)S 150 x(matched)S 149 x(port)S 150 x
(numbers)S 150 x(between)S 150 x(bridges,)S 598 y 5991 X(where)S
193 x(possible)S 193 x(\(Port)S 193 x(2)S 193 x(on)S 193 x(T)S -30 x
(ranslan)S 193 x(1)S 193 x(to)S 193 x(Port)S 193 x(2)S 193 x(on)S
194 x(T)S -31 x(ranslan)S 194 x(2.\))S 302 x(This)S 194 x(is)S 597 y
5991 X(NOT)S 191 x(necessary-)S 191 x(T)S -30 x(ranslans)S 191 x
(have)S 191 x(NO)S 191 x(IDEA)S 189 x(which)S 192 x(port)S 191 x(is)S
190 x(being)S 192 x(used)S 191 x(on)S 598 y 5991 X(a)S 156 x(remote)S
157 x(bridge,)S 159 x(and)S 157 x(couldn')S -9 x(t)S 156 x(care)S
157 x(less.)S 218 x(As)S 155 x(long)S 157 x(as)S 156 x(port)S 157 x
(SPEEDS)S 155 x(match,)S 598 y 5991 X(Port)S 249 x(2)S 248 x(on)S
249 x(one)S 249 x(bridge)S 249 x(will)S 248 x(talk)S 248 x(quite)S
249 x(happily)S 249 x(with)S 248 x(port)S 249 x(7)S 248 x(on)S 249 x
(another)S -36 x(.)S 598 y 5991 X(Similarly)S -55 x(,)S 219 x(since)S
208 x("Network)S 208 x(Groups")S 207 x(are)S 209 x(con\211gu)S 2 x
(rable,)S 219 x(we)S 207 x(could)S 209 x(do)S 208 x(nasty)S 597 y
5991 X(and)S 155 x(creative)S 156 x(things)S 155 x(like)S 155 x
(putting)S 156 x(both)S 155 x(Ports)S 154 x(2)S 155 x(and)S 155 x(3)S
155 x(in)S 155 x(Network)S 155 x(Group)S 155 x(7,)S 598 y 5991 X
(and)S 133 x(Port)S 132 x(7)S 133 x(in)S 133 x(Network)S 132 x
(Group)S 132 x(2)S 133 x(\(Just)S 132 x(leave)S 133 x(the)S 132 x
(Ethernet)S 133 x(port)S 133 x(as)S 132 x(group)S 133 x(1)S 132 x(-)S
598 y 5991 X(O.K.?\))S 207 x(But,)S 131 x(whenever)S 122 x
(possible,)S 130 x(it)S 122 x(makes)S 121 x(thing)S 123 x(a)S 122 x
(lot)S 121 x(easier)S 122 x(to)S 121 x(troubleshoot)S 598 y 5991 X
(if)S 144 x(we)S 144 x(use)S 144 x(Network)S 144 x(Groups)S 144 x
(that)S 144 x(make)S 145 x(sense.)S 214 x(Also,)S 148 x(if)S 144 x
(you)S 145 x(wanna)S 145 x(see)S 144 x(some)S 597 y 5991 X(WIERD)S
202 x(symptoms,)S 212 x(put)S 203 x(the)S 204 x(Ethernet)S 204 x
(port)S 203 x(in)S 203 x(the)S 204 x(same)S 203 x(Network)S 203 x
(Group)S 598 y 5991 X(as)S 166 x(one)S 166 x(of)S 166 x(the)S 166 x
(Serial)S 166 x(ports-)S 166 x(UGL)S -46 x(Y!)S 29901 Y 4796 X F152
(3)S
(\20310)S 498 x(The)S 166 x(V)S -31 x(italink)S 166 x(T)S -44 x
(ranslan)S 167 x(bridge)S
PP
EP
%%DOC$Page: 3-11 53
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Oh)S 217 x(yeah,)S 231 x(another)S 217 x(thing)S
218 x(\(as)S 216 x(long)S 218 x(as)S 216 x(we're)S 217 x(discussing)S
216 x(confusing)S 218 x(topics\),)S 598 y 5991 X(when)S 168 x(you)S
168 x(look)S 168 x(at)S 167 x(port)S 167 x(displays)S 167 x(using)S
168 x(the)S 168 x(T)S -31 x(ranslan)S 168 x(console)S 168 x(port)S
167 x(\(i.e.,)S 2 x(The)S 598 y 5991 X(DSDL)S 157 x(command\),)S
160 x(The)S 158 x(Ethernet)S 158 x(port)S 158 x(is)S 157 x(NOT)S
158 x(CALLED)S 157 x(Port)S 158 x(1-)S 157 x(It')S -19 x(s)S 157 x
(called)S 598 y 5991 X("Ethernet".)S 537 x(Port)S 272 x(2,)S 298 x
(the)S 272 x(\211rst)S 271 x(serial)S 271 x(port,)S 298 x(is)S 271 x
(called)S 271 x("Card)S 271 x(1,)S 298 x(port)S 271 x(1".)S 597 y
5991 X(Likewise,)S 236 x(Port)S 222 x(6)S 221 x(\(the)S 222 x
(\211rst)S 222 x(port)S 221 x(on)S 223 x(the)S 221 x(Second)S 222 x
(line)S 222 x(card,)S 237 x(if)S 221 x(present\))S 222 x(is)S 598 y
5991 X(called)S 166 x("Card)S 166 x(2,)S 166 x(port)S 166 x(1".)S
222 x(Got)S 165 x(it?)S 8751 Y 5991 X(Back)S 173 x(to)S 173 x(our)S
174 x(Hero,)S 175 x(who)S 173 x(was)S 172 x(last)S 172 x(seen)S 174 x
(splitti)S -2 x(ng)S 174 x(traf\211c)S 174 x(between)S 172 x(two)S
173 x(56Kb)S 598 y 5991 X(links.)S 413 x(Depending)S 230 x(on)S 230 x
(traf)S
(\211c)S 230 x(type)S 230 x(and)S 230 x(load,)S 245 x(putting)S 231 x
(the)S 229 x(two)S 229 x(links)S 230 x(into)S 598 y 5991 X(the)S
241 x(same)S 241 x(Network)S 241 x(Group)S 241 x(MA)S -46 x(Y)S 240 x
(or)S 242 x(MA)S -46 x(Y)S 240 x(not)S 241 x(make)S 242 x(everyone)S
242 x(happy)S 242 x(in)S 598 y 5991 X(LANland.)S 222 x(Consider:)S
12338 Y 5991 X(Even)S 214 x(though)S 216 x(we)S 213 x(have)S 215 x
(two)S 213 x(or)S 214 x(more)S 214 x(links)S 214 x(running)S 216 x
(in)S 214 x(parallel,)S 226 x(traf\211c)S 214 x(is)S 598 y 5991 X
(not)S 222 x(AUTOMA)S -28 x(TICALL)S -46 x(Y)S 221 x(split)S 221 x
(between)S 222 x(them.)S 389 x(The)S 223 x(T)S -31 x(ranslan)S 223 x
(bridge)S 222 x(will)S 597 y 5991 X(STILL)S 204 x(learn)S 204 x
(speci\211c)S 203 x(node)S 204 x(addresses)S 203 x(over)S 204 x
(whichever)S 204 x(physical)S 204 x(port)S 203 x(that)S 598 y 5991 X
(node')S -18 x(s)S 165 x(\211rst)S 166 x(packet)S 167 x(comes)S 165 x
(in)S 167 x(on.)S 29901 Y 14419 X F152(The)S 167 x(V)S -31 x
(italink)S 166 x(T)S -44 x(ranslan)S 167 x(bridge)S 499 x(3\2031)S
-37 x(1)S
PP
EP
%%DOC$Page: 3-12 54
1000 BP 39600 30600 PM 0 0 XY
3960 Y 5991 X F36(Figu)S 2 x(re)S 165 x(3\2034:)S 498 x(Node)S 167 x
(Address)S 166 x(learning)S 167 x(in)S 167 x(a)S 166 x(T)S -27 x
(ranslan)S 167 x(Environ)S 2 x(ment)S 5020 Y 17020 X F98(VAX)S 269 x
(A)S 498 y 17020 X(-----)S 499 y -807 x(|)S 498 y -269 x(|)S 498 y
13523 X(#====+++======+++==============#)S 537 x(Ethernet)S 269 x
(Segment)S 269 x(1)S 498 y 15137 X(|)S 498 y -269 x(|)S 498 y 12447 X
(----------------------------------)S 498 y 14330 X(Port)S 269 x(1)S
269 x(\(Ethernet\))S 499 y 13254 X(Translan)S 269 x(III)S 269 x
(\(Bridge)S 269 x(#1\))S 498 y 12447 X(Port)S 269 x(2)S 17289 X
(Port)S 269 x(3)S 19979 X(Port)S 269 x(4)S 498 y 12447 X
(----------------------------------)S 498 y 12716 X(/)S 17827 X(\\)S
20566 X(\\)S 498 y 11640 X(CSU-DSU)S 17289 X(Modem)S 19979 X(Modem)S
498 y 11909 X(/)S 18096 X(\\)S 20835 X(\\)S 498 y 9757 X(T1)S 269 x
(Link)S 269 x(\\)S 18145 X(/)S 538 x(56Kb)S 807 x(/)S 538 x(56Kb)S
498 y 11909 X(/)S 18365 X(\\)S 20835 X(\\)S 499 y 11371 X(/)S 18634 X
(\\)S 21104 X(\\)S 498 y 10564 X(CSU-DSU)S 18903 X(Modem)S 21324 X
(Modem)S 498 y 11102 X(/)S 19441 X(\\)S 21642 X(\\)S 498 y 7605 X
(--------------------------)S 17289 X(-----------------------)S 498 y
9757 X(Port)S 269 x(2)S 18096 X(Port)S 269 x(2)S 807 x(Port)S 269 x
(3)S 498 y 8143 X(Translan)S 269 x(III)S 269 x(\(Bridge)S 269 x
(#2\))S 17289 X(Translan)S 269 x(350)S 269 x(\(Bridge)S 268 x(#3\))S
498 y 9757 X(Port)S 269 x(1)S 269 x(\(Ethernet\))S 18634 X(Port)S
269 x(1)S 269 x(\(Ethernet\))S 499 y 7605 X
(--------------------------)S 17289 X(-----------------------)S 498 y
10295 X(|)S 19441 X(|)S 498 y 10295 X(|)S 19441 X(|)S 498 y 8412 X
(#=====+++=====#)S 13523 X
(#===+++===+++========+++==========+++====#)S 498 y 8950 X(Segment)S
269 x(2)S 14868 X(|)S 16482 X(|)S 18096 X(Segment)S 269 x(3)S 22937 X
(|)S 498 y 14868 X(|)S 16482 X(|)S 22937 X(|)S 498 y 14330 X(-----)S
269 x(-----)S 21593 X(-------------)S 498 y 14330 X(VAX)S 269 x(B)S
269 x(VAX)S 269 x(C)S 21593 X(DECserver)S 268 x(200)S 22256 Y 5991 X
F151(For)S 233 x(instance,)S 249 x(let')S -19 x(s)S 232 x(say)S 233 x
(that)S 232 x(the)S 232 x(\211rst)S 232 x(packet)S 233 x(sent)S 232 x
(by)S 233 x(V)S -56 x(AX)S 232 x(B)S 232 x(to)S 232 x(V)S -56 x(AX)S
232 x(A)S 597 y 5991 X(comes)S 230 x(in)S 231 x(on)S 231 x(T)S -30 x
(ranslan)S 230 x(1')S -18 x(s)S 230 x(port)S 230 x(3.)S 416 x(T)S
-31 x(ranslan)S 231 x(1)S 231 x(now)S 230 x("Knows")S 229 x(V)S -55 x
(AX)S 230 x(B)S 230 x(as)S 598 y 5991 X(being)S 163 x(out)S 162 x
(Port)S 162 x(3.)S 221 x(The)S 162 x(DECserver)S 162 x(200)S 162 x
(might)S 162 x(also)S 162 x(come)S 162 x(in)S 162 x(on)S 163 x(Port)S
162 x(3,)S 163 x(and)S 598 y 5991 X(V)S -56 x(AX)S 183 x(C)S 184 x
(might)S 184 x(come)S 184 x(in)S 184 x(on)S 184 x(Port)S 184 x(4.)S
274 x(So)S 184 x(T)S -31 x(ranslan)S 184 x(#1)S 184 x(associates)S
182 x(V)S -55 x(AX)S 183 x(B)S 183 x(and)S 598 y 5991 X(the)S 156 x
(DECserver)S 155 x(with)S 156 x(Port)S 156 x(3,)S 158 x(and)S 156 x
(V)S -55 x(AX)S 155 x(C)S 155 x(with)S 156 x(Port)S 156 x(4.)S 218 x
(If)S 156 x(V)S -56 x(AX)S 155 x(A)S 156 x(sends)S 155 x(any)S 598 y
5991 X(packets)S 163 x(to)S 163 x(V)S -56 x(AX)S 162 x(B,)S 163 x
(it)S 163 x(will)S 162 x(go)S 164 x(OUT)S 162 x(Port)S 163 x(3.)S
221 x(Packets)S 163 x(for)S 163 x(V)S -55 x(AX)S 162 x(C)S 163 x
(will)S 162 x(always)S 597 y 5991 X(go)S 167 x(out)S 166 x(Port)S
166 x(4,)S 167 x(etc.)S 29901 Y 4796 X F152(3\20312)S 498 x(The)S
166 x(V)S -31 x(italink)S 166 x(T)S -44 x(ranslan)S 167 x(bridge)S
PP
EP
%%DOC$Page: 3-13 55
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Now)S -46 x(,)S 163 x(let')S -19 x(s)S 161 x(say)S
162 x(that)S 162 x(V)S -55 x(AX)S 161 x(A)S 161 x(and)S 163 x(V)S
-56 x(AX)S 161 x(B)S 162 x(typically)S 162 x(do)S 162 x(HEA)S -56 x
(VY)S 161 x(DECNET)S 161 x(\211le)S 598 y 5991 X(transfers)S 163 x
(to)S 163 x(each)S 163 x(other)S -36 x(,)S 164 x(while)S 163 x(V)S
-56 x(AX)S 163 x(C)S 163 x(doesn')S -10 x(t)S 163 x(do)S 163 x
(much,)S 165 x(maybe)S 164 x(some)S 163 x(SET)S 598 y 5991 X(HOST')S
-19 x(s)S 129 x(now)S 129 x(and)S 130 x(then.)S 210 x(In)S 129 x
(this)S 129 x(scenario,)S 138 x(the)S 129 x(DECserver)S -37 x(,)S
137 x(which)S 129 x(is)S 129 x(runn)S 2 x(ing)S 598 y 5991 X(LA)S
-27 x(T)S -46 x(,)S 207 x(is)S 206 x(sharing)S 207 x(a)S 206 x(56Kb)S
206 x(link)S 207 x(with)S 206 x(heavy)S 207 x(DECNET)S 205 x(\211le)S
207 x(transfers,)S 216 x(while)S 597 y 5991 X(V)S -56 x(AX)S 189 x
(C)S 189 x(has)S 190 x(the)S 189 x(other)S 190 x(link)S 190 x(all)S
189 x(to)S 190 x(himself,)S 195 x(but)S 190 x(hardly)S 190 x(uses)S
189 x(it.)S 292 x(Since)S 190 x(LA)S -28 x(T)S 598 y 5991 X(is)S
197 x(delay)S 198 x(sensitive)S 198 x(\(compared)S 197 x(to)S 198 x
(DECNE)S -2 x(T\),)S 199 x(we)S 197 x(might)S 198 x(start)S 197 x
(getting)S 199 x(LA)S -28 x(T)S 598 y 5991 X(users)S 138 x(knocked)S
139 x(off)S 138 x(periodically)S 138 x(while)S 138 x(DECNE)S -2 x(T)S
138 x(\211le)S 138 x(transfers)S 138 x(are)S 138 x(occuring)S 2 x(.)S
9947 Y 5991 X(W)S -28 x(e)S 167 x(have)S 167 x(numerous)S 167 x
(options)S 166 x(available)S 166 x(to)S 166 x(us)S 166 x(to)S 166 x
(mitigate)S 166 x(this)S 166 x(problem.)S 222 x(W)S -28 x(e)S 598 y
5991 X(can)S 114 x(manually)S 115 x(\211lter)S 114 x(the)S 114 x
(node)S 114 x(addresses,)S 124 x(forcing)S 115 x(speci\211c)S 114 x
(nodes)S 114 x(onto)S 114 x(speci\211c)S 597 y 5991 X(lines,)S 188 x
(assuring)S 184 x(that)S 184 x(the)S 184 x(DECs)S -2 x(ervers)S 184 x
(don')S -9 x(t)S 184 x(use)S 183 x(the)S 184 x(same)S 183 x(line)S
184 x(as)S 183 x(the)S 184 x(two)S 598 y 5991 X(heavy)S 218 x(DECNE)S
-2 x(T)S 217 x(nodes.)S 372 x(The)S 217 x(BEST)S 216 x(solution)S
216 x(for)S 216 x(this)S 216 x(problem)S 217 x(might)S 216 x(be)S
598 y 5991 X(to)S 210 x(\211lter)S 210 x(the)S 210 x(packets)S 210 x
(based)S 210 x(on)S 210 x(PROTOCOL)S 209 x(TYPE.)S 210 x(W)S -28 x
(e)S 210 x(can)S 211 x(put)S 210 x(all)S 210 x(LA)S -28 x(T)S 598 y
5991 X(\(60-04\))S 188 x(traf\211c)S 189 x(on)S 189 x(one)S 189 x
(line,)S 195 x(and)S 189 x(all)S 188 x(other)S 189 x(traf\211c)S
189 x(\(including)S 190 x(DECNE)S -2 x(T\))S 189 x(on)S 597 y 5991 X
(the)S 166 x(other)S -36 x(.)S 897 y 5991 X(Another)S 143 x
(solution)S 142 x(is)S 142 x(available)S 142 x(with)S 142 x(the)S
142 x(latest)S 142 x(versions)S 142 x(of)S 143 x(T)S -31 x(ranslan)S
143 x(III)S 141 x(and)S 598 y 5991 X(350)S 124 x(software)S 123 x
(\(remember)S -37 x(,)S 133 x(the)S 124 x(T)S -31 x(ranslan)S 124 x
(IV)S 123 x(does)S 124 x(NO)S 123 x(Filtering.)S 2 x(\))S 207 x
(There)S 125 x(is)S 123 x(an)S 598 y 5991 X(internal)S 175 x
("Queue")S 174 x(in)S 174 x(the)S 174 x(T)S -30 x(ranslan)S 174 x
(III)S 173 x(and)S 175 x(350)S 174 x(called)S 174 x(the)S 174 x
("SQMS")S 173 x(queue.)S 597 y 5991 X(Any)S 184 x(packets)S 184 x
(put)S 184 x(into)S 184 x(the)S 185 x(SQMS)S 183 x(queue)S 185 x
(are)S 184 x(given)S 185 x(a)S 184 x(LOWER)S 183 x(PRIORI)S -2 x(TY)S
598 y 5991 X(than)S 164 x(non-SQMS)S 164 x(packets.)S 221 x(So)S
163 x(if)S 164 x(we)S 163 x(put)S 163 x(DECNET)S 163 x(traf\211c)S
164 x(\(60-03\),)S 164 x(which)S 164 x(is)S 598 y 5991 X(DELA)S -47 x
(Y)S 144 x(TOLERANT)S -47 x(,)S 145 x(into)S 144 x(the)S 144 x(SQMS)S
143 x(queue,)S 150 x(then)S 144 x(LA)S -27 x(T)S 144 x(will)S 143 x
(have)S 145 x(a)S 144 x(higher)S 598 y 5991 X(priority)S -55 x(,)S
167 x("cutting)S 166 x(in)S 167 x(line")S 166 x(ahead)S 166 x(of)S
166 x(DECNET)S -47 x(.)S 896 y 5991 X(Note:)S 222 x(NEVER)S 164 x
(put)S 167 x(LA)S -28 x(T)S 166 x(into)S 166 x(the)S 167 x(SQMS)S
165 x(queue.)S 897 y 5991 X(I'm)S 192 x(tired)S 192 x(of)S 193 x
(writing)S 192 x(about)S 193 x(T)S -31 x(ranslan)S 193 x(con\211g)S
2 x(uration)S 193 x(guidelines.)S 302 x(Let')S -19 x(s)S 192 x(talk)S
598 y 5991 X(about:)S 21902 Y 4796 X F24(3.2)S 348 x(T)S -39 x
(ranslan)S 232 x(and)S 233 x(Spanning)S 233 x(T)S -39 x(ree)S 23695 Y
5991 X F151(As)S 296 x(mentioned)S 297 x(previously)S -55 x(,)S 330 x
(the)S 297 x(T)S -31 x(ranslan)S 297 x(bridges)S 297 x(participate)S
296 x(in)S 296 x(Span-)S 598 y 5991 X(ning)S 272 x(T)S -30 x(ree)S
271 x(Protocol)S 271 x(\(and)S 271 x("Root")S 271 x(election\))S
271 x(along)S 271 x(with)S 271 x(the)S 271 x(LAN)S 271 x(Bridge)S
598 y 5991 X(100')S -19 x(s.)S 433 x(What)S 236 x(wasn')S -10 x(t)S
236 x(mentioned)S 237 x(is)S 235 x(that)S 237 x(\(barring)S 237 x
(external)S 237 x(intervention\))S 598 y 5991 X(the)S 166 x(T)S -30 x
(ranslan)S 166 x(AL)S -37 x(W)S -46 x(A)S -46 x(YS)S 165 x(WINS)S
166 x(\(gets)S 165 x(elected)S 166 x(Root.\))S 29901 Y 14383 X F152
(The)S 166 x(V)S -31 x(italink)S 166 x(T)S -44 x(ranslan)S 167 x
(bridge)S 499 x(3\20313)S
PP
EP
%%DOC$Page: 3-14 56
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(Y)S -56 x(ou'll)S 154 x(remember)S 153 x(that)S
153 x(the)S 154 x(bridge)S 154 x(with)S 153 x(the)S 153 x(lowest)S
153 x("Root)S 153 x(Priority")S 153 x(becomes)S 598 y 5991 X(Root.)S
220 x(Since)S 160 x(all)S 160 x(LAN)S 161 x(Bridge)S 160 x(100')S
-19 x(s)S 161 x(have)S 161 x(the)S 160 x(same)S 160 x(Root)S 160 x
(Priority)S 161 x(\(128\),)S 162 x(the)S 598 y 5991 X(bridge)S 191 x
(with)S 190 x(the)S 190 x(lowest)S 190 x(Ethernet)S 190 x(address)S
190 x(becomes)S 190 x(Root.)S 294 x(W)S -27 x(ell,)S 197 x(T)S -31 x
(ranslan)S 598 y 5991 X(bridges)S 127 x(USUALL)S -45 x(Y)S 127 x
(start)S 126 x(out)S 128 x(with)S 126 x(a)S 128 x(Root)S 126 x
(priority)S 128 x(of)S 127 x(127,)S 136 x(and)S 127 x(lower)S 127 x
(it)S 127 x(from)S 597 y 5991 X(there!)S 8154 Y 5991 X(A)S 212 x(T)S
-30 x(ranslan)S 213 x(bridge')S -19 x(s)S 213 x("Root)S 212 x
(Priority")S 213 x(is)S 212 x(settable)S 212 x(via)S 213 x(the)S
212 x(console)S 213 x(port.)S 362 x(It)S 597 y 5991 X(can)S 241 x
(be)S 240 x(set)S 239 x(anywhere)S 241 x(from)S 240 x(0)S 240 x(to)S
240 x(255.)S 443 x(If)S 240 x(the)S 240 x(priority)S 241 x(is)S 239 x
(set)S 240 x(to)S 240 x(a)S 239 x(value)S 598 y 5991 X(greater)S
203 x(than)S 203 x(3,)S 212 x(then)S 204 x(the)S 202 x(T)S -30 x
(ranslan)S 203 x(retains)S 202 x(that)S 203 x(priority)S 203 x
(until)S 202 x(manually)S 598 y 5991 X(recon\211g)S 2 x(ured)S 167 x
(with)S 167 x(a)S 167 x(different)S 167 x(value.)S 225 x(Setting)S
168 x(the)S 167 x(value)S 167 x(to)S 167 x(0-3)S 167 x(however)S
-36 x(,)S 168 x(is)S 598 y 5991 X(a)S 178 x(bit)S 178 x(different.)S
259 x(When)S 179 x(a)S 178 x(T)S -30 x(ranslan')S -19 x(s)S 178 x
(Root)S 178 x(priority)S 179 x(is)S 178 x(con\211gur)S 2 x(ed)S 178 x
(to)S 178 x(0,)S 182 x(1,)S 182 x(2,)S 597 y 5991 X(or)S 208 x(3,)S
219 x(that)S 207 x(tells)S 207 x(the)S 208 x(bridge)S 209 x(to)S
207 x(start)S 208 x(out)S 208 x(with)S 207 x(a)S 208 x(Root)S 207 x
(Priority)S 209 x(of)S 207 x(63,)S 219 x(127,)S 598 y 5991 X(191,)S
194 x(or)S 189 x(255,)S 195 x(respectively)S -55 x(.)S 289 x(This)S
189 x(value)S 189 x(will)S 188 x(be)S 188 x(then)S 189 x
(decremented)S 189 x(by)S 189 x(2)S 188 x(for)S 598 y 5991 X(each)S
217 x(active)S 216 x(Network)S 216 x(Group.)S 372 x(The)S 217 x
(more)S 216 x(network)S 216 x(groups,)S 230 x(the)S 216 x(lower)S
216 x(the)S 598 y 5991 X(\211nal)S 186 x(Root)S 184 x(priority)S
-55 x(,)S 191 x(the)S 185 x(more)S 185 x(likely)S 186 x(it)S 184 x
(is)S 185 x(that)S 185 x(the)S 185 x(bridge)S 186 x(will)S 184 x
(become)S 185 x(the)S 597 y 5991 X(Root)S 166 x(bridge.)S 14779 Y
4796 X F36(T)S -37 x(able)S 150 x(3\2032:)S 498 x(T)S -27 x(ranslan)S
150 x(Con\211gu)S 2 x(red)S 149 x(priori)S 2 x(ty)S 149 x(vs.)S 224 x
(Root)S 150 x(priority)S 224 y 4796 X 17928 24 R 598 y 4796 X F157
(Con)S
(\211gured)S 149 x(Priority)S 10624 X(Starting)S 149 x(Root)S 149 x
(Priority)S 299 y 4796 X 17928 24 R 647 y 4796 X F155(0)S 10624 X
(63)S 897 y 4796 X(1)S 10624 X(127)S 896 y 4796 X(2)S 10624 X(191)S
897 y 4796 X(3)S 10624 X(255)S 897 y 4796 X(4-255)S 10624 X(4-255)S
150 x(\(Hard)S 2 x(wired\))S 398 y 4796 X 17928 24 R 22525 Y 5991 X
F151(Let')S -19 x(s)S 166 x(look)S 166 x(at)S 166 x(a)S 166 x
(picture:)S 29901 Y 4796 X F152(3\20314)S 498 x(The)S 166 x(V)S -31 x
(italink)S 166 x(T)S -44 x(ranslan)S 167 x(bridge)S
PP
EP
%%DOC$Page: 3-15 57
1000 BP 39600 30600 PM 0 0 XY
3975 Y 5991 X F36(Figu)S 2 x(re)S 165 x(3\2035:)S 498 x(T)S -27 x
(ranslan)S 167 x(Spanni)S 2 x(ng)S 167 x(T)S -27 x(ree,)S 166 x
(Root)S 166 x(Electio)S 2 x(n)S 811 y 14330 X F98
(#==========+++========#)S 498 y 17558 X(|)S 498 y -269 x(|)S 498 y
-538 x(Port)S 269 x(A)S 498 y 17020 X(LAN)S 269 x(Bridge)S 269 x
(100)S 538 x(\(priority)S 268 x(128\))S 498 y 17289 X(Port)S 269 x
(B)S 498 y 17558 X(|)S 498 y -269 x(|)S 499 y 13523 X
(#====+++======+++==============#)S 537 x(Ethernet)S 269 x(Segment)S
269 x(1)S 498 y 15137 X(|)S 498 y -269 x(|)S 498 y 12447 X
(----------------------------------)S 498 y 14330 X(Port)S 269 x(1)S
269 x(\(Ethernet\))S 498 y 13254 X(Translan)S 269 x(III)S 269 x
(\(Bridge)S 269 x(#1\))S 807 x(\(priority)S 268 x(121\))S 498 y
12447 X(Port)S 269 x(2)S 17289 X(Port)S 269 x(3)S 19979 X(Port)S
269 x(4)S 499 y 12447 X(----------------------------------)S 498 y
12716 X(/)S 17827 X(\\)S 20566 X(\\)S 498 y 11640 X(CSU-DSU)S 17289 X
(Modem)S 19979 X(Modem)S 498 y 11909 X(/)S 18096 X(\\)S 20835 X(\\)S
498 y 9757 X(T1)S 269 x(Link)S 269 x(\\)S 18145 X(/)S 538 x(56Kb)S
807 x(/)S 538 x(56Kb)S 498 y 11909 X(/)S 18365 X(\\)S 20835 X(\\)S
498 y 11371 X(/)S 18634 X(\\)S 21104 X(\\)S 498 y 10564 X(CSU-DSU)S
18903 X(Modem)S 21324 X(Modem)S 499 y 11102 X(/)S 19441 X(\\)S 21642 X
(\\)S 498 y 7605 X(--------------------------)S 17289 X
(-----------------------)S 498 y 9757 X(Port)S 269 x(2)S 18096 X
(Port)S 269 x(2)S 807 x(Port)S 269 x(3)S 498 y 8143 X(Translan)S
269 x(III)S 269 x(\(Bridge)S 269 x(#2\))S 269 x(\(123\))S 17827 X
(Translan)S 269 x(350)S 269 x(\(Bridge)S 268 x(#3\))S 269 x(\(123\))S
498 y 9757 X(Port)S 269 x(1)S 269 x(\(Ethernet\))S 18634 X(Port)S
269 x(1)S 269 x(\(Ethernet\))S 498 y 7605 X
(--------------------------)S 17289 X(-----------------------)S 498 y
10295 X(|)S 19441 X(|)S 499 y 10295 X(|)S 19441 X(|)S 498 y 8412 X
(#=====+++=====#)S 16213 X(#==========+++==============#)S 498 y
8950 X(Segment)S 269 x(2)S 17020 X(Segment)S 269 x(3)S 896 y 5991 X
F151(In)S 165 x(the)S 165 x(above)S 165 x(\211gure,)S 167 x(the)S
165 x(LAN)S 164 x(Bridge)S 165 x(100,)S 166 x(as)S 164 x(always,)S
165 x(has)S 165 x(a)S 164 x(Root)S 165 x(Priority)S 598 y 5991 X(of)S
251 x(128.)S 477 x(T)S -31 x(ranslan)S 252 x(#2)S 251 x(and)S 251 x
(T)S -31 x(ranslan)S 252 x(#3)S 251 x(each)S 251 x(have)S 252 x(2)S
251 x(Network)S 251 x(Groups.)S 598 y 5991 X(The)S 180 x(Ethernet)S
180 x(port)S 179 x(is)S 179 x(Group)S 180 x(1,)S 183 x(and)S 180 x
(the)S 180 x(Serial)S 179 x(Port)S 180 x(is)S 179 x(Network)S 179 x
(Group)S 180 x(2.)S 598 y 5991 X(Remember)S -37 x(,)S 152 x(we)S
147 x(put)S 148 x(T)S -31 x(ranslan)S 148 x(#3')S -19 x(s)S 148 x
(two)S 147 x(serial)S 147 x(ports)S 147 x(into)S 148 x(the)S 148 x
(same)S 147 x(Network)S 597 y 5991 X(Group.)S 211 x(For)S 135 x
(Root)S 133 x(calculation,)S 142 x(we)S 133 x(look)S 135 x(at)S 133 x
(active)S 135 x(NETWOR)S -2 x(K)S 134 x(GROUPS,)S 133 x(not)S 598 y
5991 X(physical)S 178 x(lines.)S 255 x(So,)S 181 x(assuming)S 177 x
(that)S 178 x(these)S 177 x(bridges)S 177 x(started)S 177 x(out)S
178 x(with)S 176 x(a)S 178 x(Root)S 598 y 5991 X(priority)S 177 x
(set)S 175 x(to)S 176 x(1)S 176 x(\(default\),)S 179 x(that)S 176 x
(means)S 176 x(they)S 176 x(subtract)S 176 x(2)S 176 x(for)S 177 x
(each)S 176 x(Network)S 598 y 5991 X(Group)S 166 x(from)S 166 x
(127,)S 167 x(giving)S 167 x(them)S 166 x(a)S 166 x(priority)S 167 x
(of)S 166 x(123)S 166 x(\(127)S 166 x(-)S 165 x(\(2X2\)\).)S 29901 Y
14383 X F152(The)S 166 x(V)S -31 x(italink)S 166 x(T)S -44 x
(ranslan)S 167 x(bridge)S 499 x(3\20315)S
PP
EP
%%DOC$Page: 3-16 58
1000 BP 39600 30600 PM 0 0 XY
3969 Y 5991 X F151(T)S -31 x(ranslan)S 213 x(#1)S 213 x(has)S 213 x
(3)S 212 x(active)S 213 x(Network)S 213 x(Groups-)S 212 x(the)S 213 x
(Ethernet)S 213 x(port)S 213 x(and)S 213 x(two)S 598 y 5991 X
(Serial)S 173 x(Port)S 173 x(Groups)S 173 x(\(Ports)S 173 x(3)S 173 x
(&)S 173 x(4)S 173 x(were)S 173 x(both)S 174 x(set)S 172 x(to)S 173 x
(Network)S 173 x(Group)S 173 x(3.\))S 243 x(So)S 598 y 5991 X(he)S
121 x(subtracts)S 120 x(6)S 121 x(from)S 121 x(127,)S 130 x(ends)S
121 x(up)S 121 x(with)S 120 x(a)S 121 x(Root)S 120 x(Priority)S 122 x
(of)S 120 x(121,)S 130 x(and)S 121 x(becomes)S 598 y 5991 X(the)S
166 x(Root)S 166 x(Bridge.)S 222 x(That)S 166 x(wasn')S -9 x(t)S
165 x(so)S 166 x(tough,)S 168 x(was)S 165 x(it?)S 7556 Y 5991 X(Now)S
-46 x(,)S 141 x(after)S 135 x(the)S 135 x(bridges)S 134 x(elect)S
135 x(a)S 135 x(ROO)S -2 x(T)S 135 x(bridge,)S 142 x(T)S -30 x
(ranslan)S 135 x(bridges)S 134 x(also)S 135 x(elect)S 134 x(a)S 598 y
5991 X("BACK)S -2 x(UP)S 157 x(ROOT")S 155 x(bridge.)S 220 x(Just)S
156 x(like)S 157 x(the)S 157 x(1st)S 155 x(runn)S 2 x(er)S 157 x(up)S
156 x(for)S 157 x(Miss)S 156 x(America,)S 597 y 5991 X(in)S 197 x
(the)S 197 x(event)S 198 x(that)S 197 x(the)S 197 x(root)S 197 x
(bridge)S 197 x(is)S 197 x(unable)S 197 x(to)S 197 x(ful\211ll)S
197 x(his/her)S 198 x(duties,)S 205 x(etc,)S 598 y 5991 X(etc.)S
370 x(In)S 215 x(other)S 216 x(words,)S 227 x(If)S 215 x(the)S 216 x
(Root)S 214 x(bridge)S 216 x(DIES,)S 215 x(the)S 215 x(backup)S 216 x
(root)S 216 x(will)S 214 x(be)S 598 y 5991 X(standing)S 153 x(by)S
-55 x(,)S 156 x(ready)S 154 x(to)S 152 x(take)S 153 x(the)S 153 x
(Root')S -19 x(s)S 152 x(place)S 153 x(as)S 152 x(Don)S 153 x
(Corleone,)S 156 x(Big)S 153 x(Cheese.)S 12338 Y 5991 X(Only)S 244 x
(T)S -31 x(ranslans)S 243 x(which)S 244 x(have)S 244 x(DIREC)S -2 x
(T)S 244 x(LINKS)S 242 x(to)S 243 x(the)S 244 x(Root)S 242 x(Bridge)S
244 x(\(i.e.,)S 598 y 5991 X(only)S 244 x(1)S 244 x(hop)S 244 x
(away\))S 243 x(participate)S 244 x(in)S 243 x(the)S 244 x("Backup)S
244 x(Root")S 243 x(election.)S 455 x(For)S 244 x(the)S 597 y 5991 X
(Root)S 169 x(Election,)S 170 x(all)S 169 x(T)S -31 x(ranslans)S
169 x(decrement)S 170 x(their)S 169 x(Root)S 169 x(Priority)S 170 x
(by)S 169 x(2)S 169 x(for)S 170 x(each)S 598 y 5991 X(Network)S 199 x
(Group.)S 319 x(In)S 199 x(the)S 199 x(Backup)S 199 x(Root)S 198 x
(election,)S 207 x(all)S 199 x(competing)S 199 x(T)S -31 x(ranslans)S
598 y 5991 X(subtract)S 252 x(1)S 252 x(from)S 253 x(their)S 252 x
(Root)S 252 x(priority)S 253 x(for)S 252 x(each)S 253 x(Network)S
252 x(Group.)S 481 x(In)S 252 x(the)S 598 y 5991 X(previous)S 205 x
(\211gure,)S 215 x(T)S -30 x(ranslans)S 204 x(2)S 204 x(and)S 204 x
(3)S 204 x(are)S 204 x(both)S 205 x(only)S 205 x(1)S 204 x(hop)S
204 x(away)S 204 x(from)S 204 x(the)S 598 y 5991 X(Root,)S 230 x
(and)S 218 x(they)S 218 x(will)S 216 x(both)S 217 x(re-calculate)S
218 x(their)S 218 x(Root)S 216 x(Priority)S 218 x(for)S 218 x(the)S
217 x(honor)S 597 y 5991 X(of)S 174 x(Backup)S 175 x(Root.)S 246 x
(They)S 175 x(each)S 175 x(subtract)S 174 x(2)S 175 x(\(1)S 174 x
(for)S 174 x(each)S 175 x(Network)S 174 x(Group\))S 174 x(from)S
598 y 5991 X(127,)S 167 x(and)S 167 x(arrive)S 168 x(at)S 166 x(a)S
167 x(Root)S 166 x(priority)S 167 x(of)S 167 x(125.)S 224 x(Like)S
167 x(all)S 166 x(other)S 168 x(tiebreakers,)S 167 x(the)S 598 y
5991 X(T)S -31 x(ranslan)S 131 x(with)S 129 x(the)S 130 x(LOWER)S
129 x(Ethernet)S 130 x(address)S 129 x(wins,)S 137 x(and)S 130 x
(gets)S 130 x(to)S 130 x(be)S 129 x(backup)S 598 y 5991 X(root.)S
219 x(LAN)S 157 x(Bridge)S 158 x(100')S -19 x(s)S 157 x(do)S 157 x
(not)S 158 x(participate)S 157 x(in)S 158 x(the)S 157 x("Backup)S
158 x(Root")S 156 x(election.)S 29901 Y 4796 X F152(3\20316)S 498 x
(The)S 166 x(V)S -31 x(italink)S 166 x(T)S -44 x(ranslan)S 167 x
(bridge)S
PP
EP
%%DOC$Page: 3-17 59
1000 BP 39600 30600 PM 0 0 XY
4497 Y 5991 X F151(Let')S -19 x(s)S 166 x(look)S 166 x(at)S 166 x
(another)S 167 x(con\211gu)S 2 x(ration:)S 5708 Y 5991 X F36(Figu)S
2 x(re)S 165 x(3\2036:)S 498 x(T)S -27 x(ranslan)S 167 x(Spanni)S
2 x(ng)S 167 x(T)S -27 x(ree)S 165 x(&)S 166 x(Loop)S 168 x
(Detection)S 6817 Y 13523 X F98(#====+++====#)S 538 x(Ethernet)S
269 x(Segment)S 268 x(1)S 498 y 15137 X(|)S 498 y -269 x(|)S 498 y
12447 X(----------------------------------)S 498 y 14330 X(Port)S
269 x(1)S 269 x(\(Ethernet\))S 499 y 13254 X(Translan)S 269 x(III)S
269 x(\(Bridge)S 269 x(#1\))S 498 y 12447 X(Port)S 269 x(2)S 17289 X
(Port)S 269 x(3)S 19979 X(Port)S 269 x(4)S 498 y 12447 X
(----------------------------------)S 498 y 12716 X(/)S 17827 X(\\)S
20566 X(\\)S 498 y 11640 X(CSU-DSU)S 17289 X(Modem)S 19979 X(Modem)S
498 y 11909 X(/)S 18096 X(\\)S 20835 X(\\)S 498 y 9757 X(T1)S 269 x
(Link)S 269 x(\\)S 18145 X(/)S 538 x(56Kb)S 807 x(/)S 538 x(56Kb)S
499 y 11909 X(/)S 18365 X(\\)S 20835 X(\\)S 498 y 11371 X(/)S 18634 X
(\\)S 21104 X(\\)S 498 y 10564 X(CSU-DSU)S 18903 X(Modem)S 21324 X
(Modem)S 498 y 11102 X(/)S 19441 X(\\)S 21642 X(\\)S 498 y 5991 X
(------------------------)S 19710 X(-------------------------)S 498 y
7336 X(Port)S 269 x(2)S 12447 X(|)S 13792 X(56Kb)S 269 x(Telco)S
269 x(Link)S 19441 X(|)S 269 x(Port)S 269 x(2)S 806 x(Port)S 269 x
(3)S 498 y 5991 X(Translan)S 269 x(III)S 269 x(\(Bridge)S 269 x
(#2\)|-------------------------|)S 269 x(Translan)S 268 x(350)S 269 x
(\(Bridge)S 269 x(#3\))S 498 y 7336 X(Port)S 269 x(1)S 269 x
(\(Ethernet\))S 538 x(|Port)S 269 x(3)S 17827 X(Port)S 269 x
(4|-------------------------)S 499 y 5991 X
(------------------------)S 20517 X(|)S 269 x(Port)S 268 x(1)S 269 x
(\(Ethernet\))S 498 y 10295 X(|)S 20517 X(|)S 498 y 10295 X(|)S
20517 X(|)S 498 y 8412 X(#=====+++=====#)S 17289 X
(#==========+++=============#)S 498 y 8950 X(Segment)S 269 x(2)S
18096 X(Segment)S 269 x(3)S 20864 Y 5991 X F151(Notice)S 166 x(the)S
166 x(new)S 166 x(link)S 167 x(between)S 166 x(bridges)S 166 x(2)S
166 x(and)S 166 x(3.)S 897 y 5991 X(If)S 175 x(we)S 176 x(assume)S
175 x(all)S 175 x(bridges)S 176 x(are)S 176 x(precon\211gu)S 2 x
(red)S 175 x(for)S 176 x(priority)S 176 x(1)S 176 x(\(Root)S 175 x
(starts)S 175 x(at)S 598 y 5991 X(127\),)S 198 x(and)S 192 x(that)S
191 x(the)S 191 x(2)S 192 x(links)S 191 x(between)S 191 x(bridges)S
192 x(1)S 191 x(and)S 192 x(3)S 191 x(belong)S 192 x(to)S 191 x(the)S
192 x(same)S 597 y 5991 X(Network)S 188 x(Group,)S 193 x(then)S 188 x
(all)S 187 x(bridges)S 188 x(will)S 187 x(have)S 188 x(the)S 188 x
(same)S 187 x(Root)S 187 x(Priority-)S 188 x(121)S 598 y 5991 X
(\(127-\(3X2\)\).)S 383 x(The)S 220 x(bridge)S 221 x(with)S 219 x
(the)S 220 x(lowest)S 219 x(Ethernet)S 221 x(address)S 219 x(would)S
220 x(then)S 598 y 5991 X(become)S 145 x(the)S 146 x(Root.)S 214 x
(Let')S -19 x(s)S 145 x(assume)S 145 x(that)S 145 x(T)S -31 x
(ranslan)S 145 x(#1)S 145 x(has)S 145 x(the)S 146 x(lowest)S 144 x
(Address,)S 598 y 5991 X(and)S 226 x(thus)S 226 x(becomes)S 226 x
(Root.)S 401 x(His)S 226 x(\211rst)S 225 x(job)S 227 x(as)S 225 x
(Root)S 226 x(Bridge)S 226 x(is)S 226 x(to)S 225 x(detect)S 226 x
(and)S 597 y 5991 X("Break")S 186 x(any)S 188 x(loops)S 186 x(in)S
187 x(the)S 186 x(LAN.)S 187 x(And)S 187 x(you)S 187 x(can)S 187 x
(see)S 187 x(that)S 186 x(there)S 187 x(IS)S 186 x(a)S 186 x(loop)S
187 x(in)S 598 y 5991 X(the)S 166 x(above)S 167 x(LAN.)S 29901 Y
14383 X F152(The)S 166 x(V)S -31 x(italink)S 166 x(T)S -44 x
(ranslan)S 167 x(bridge)S 499 x(3\20317)S
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3969 Y 5991 X F151(Once)S 185 x(a)S 185 x(root)S 186 x(is)S 184 x
(elected,)S 191 x(all)S 185 x(the)S 185 x(other)S 185 x(bridges)S
186 x(report)S 185 x(their)S 185 x("Cost)S 184 x(to)S 185 x(Root".)S
598 y 5991 X(For)S 168 x(T)S -31 x(ranslan)S 168 x(bridges,)S 168 x
(the)S 167 x("Cost)S 167 x(to)S 167 x(Root")S 166 x(is)S 167 x(a)S
167 x(function)S 168 x(of)S 168 x(datalink)S 167 x(speed.)S 598 y
5991 X(Since)S 213 x(we're)S 213 x(going)S 214 x(to)S 213 x(have)S
214 x(to)S 213 x(shut)S 213 x(off)S 213 x(a)S 213 x(link)S 214 x
(somewhere)S 213 x(to)S 213 x("break")S 213 x(the)S 598 y 5991 X
(loop,)S 221 x(we)S 209 x(want)S 210 x(to)S 209 x(be)S 210 x(sure)S
210 x(the)S 210 x(highest)S 210 x(speed)S 210 x(Link)S 210 x(is)S
210 x(left)S 209 x(functional.)S 354 x(T)S -46 x(o)S 597 y 5991 X
(determine)S 188 x(the)S 188 x("cost")S 186 x(of)S 188 x(a)S 187 x
(data)S 187 x(link,)S 194 x(we)S 188 x(divide)S 187 x(the)S 188 x
(baud)S 188 x(rate)S 187 x(of)S 188 x(the)S 188 x(link)S 598 y 5991 X
(into)S 166 x(100,000.)S 222 x(Thus;)S 8203 Y 4796 X F36(T)S -37 x
(able)S 150 x(3\2033:)S 498 x(Line)S 151 x(Speeds)S 150 x(and)S 150 x
(Cost)S 149 x(Calculati)S 2 x(ons)S 225 y 4796 X 17928 24 R 597 y
4796 X F157(BAUD)S 150 x(RA)S -24 x(TE)S 10624 X(COST)S 299 y 4796 X
17928 24 R 648 y 4796 X F155(9600)S 10624 X(10416)S 896 y 4796 X
(19,200)S 10624 X(5208)S 897 y 4796 X(56,000)S 10624 X(1785)S 897 y
4796 X(1)S -25 x(12,000)S 10624 X(892)S 896 y 4796 X(224,000)S 10624 X
(446)S 897 y 4796 X(512,000)S 10624 X(195)S 897 y 4796 X(1,544,000)S
10624 X(64)S 896 y 4796 X(2,048,000)S 10624 X(48)S 897 y 4796 X
(10,000,000)S 10624 X(10)S 398 y 4796 X 17928 24 R 19536 Y 5991 X
F151(Links)S 149 x(in)S 150 x(parallel)S 148 x(Network)S 149 x
(Groups)S 149 x(\(such)S 149 x(as)S 148 x(between)S 149 x(T)S -31 x
(ranslan)S 150 x(#1)S 148 x(and)S 149 x(#3\))S 598 y 5991 X(are)S
139 x(\211rst)S 139 x(added)S 139 x(together)S -36 x(,)S 144 x(then)S
140 x(divided)S 139 x(into)S 139 x(100K.)S 139 x(If)S 138 x(a)S 139 x
(Bridge)S 139 x(is)S 139 x(more)S 139 x(than)S 598 y 5991 X(1)S 152 x
("hop")S 152 x(away)S 152 x(from)S 152 x(the)S 152 x(root,)S 156 x
(the)S 152 x(Link)S 153 x(costs)S 151 x(are)S 152 x(added)S 152 x
(together)S -36 x(,)S 155 x(plus)S 152 x(1)S 152 x(for)S 597 y 5991 X
(each)S 167 x(bridge.)S 222 x(So:)S 897 y 5991 X(\201)S 595 x(The)S
189 x(cost)S 188 x(of)S 188 x(the)S 188 x(path)S 189 x(between)S
188 x(the)S 188 x(Root)S 188 x(and)S 189 x(T)S -31 x(ranslan)S 189 x
(2)S 188 x(would)S 188 x(be)S 188 x(64)S 598 y 6888 X(\(T1\).)S 896 y
5991 X(\201)S 595 x(The)S 167 x(cost)S 167 x(of)S 167 x(the)S 167 x
(path)S 167 x(between)S 167 x(the)S 167 x(Root)S 167 x(and)S 167 x
(T)S -31 x(ranslan)S 168 x(3)S 167 x(would)S 166 x(be)S 167 x(892)S
598 y 6888 X(\(100,000/\(56+56\)\).)S 897 y 5991 X(\201)S 595 x(The)S
151 x(cost)S 150 x(of)S 151 x(the)S 150 x(path)S 151 x(to)S 150 x
(the)S 151 x(Root-through)S 152 x(T)S -31 x(ranslan)S 151 x(2)S 151 x
(from)S 150 x(T)S -31 x(ranslan)S 151 x(3)S 597 y 6888 X(would)S
166 x(be)S 166 x(1850)S 165 x(\(64)S 166 x(+)S 166 x(1)S 166 x(+)S
166 x(1785\).)S 897 y 5991 X(\201)S 595 x(The)S 151 x(cost)S 150 x
(of)S 151 x(the)S 150 x(path)S 151 x(to)S 150 x(the)S 151 x
(Root-through)S 152 x(T)S -31 x(ranslan)S 151 x(3)S 151 x(from)S
150 x(T)S -31 x(ranslan)S 151 x(2)S 598 y 6888 X(would)S 166 x(be)S
166 x(2678)S 165 x(\(892)S 166 x(+)S 166 x(1)S 166 x(+)S 166 x
(1785\).)S 29901 Y 4796 X F152(3\20318)S 498 x(The)S 166 x(V)S -31 x
(italink)S 166 x(T)S -44 x(ranslan)S 167 x(bridge)S
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3969 Y 5991 X F151(So,)S 239 x(the)S 225 x(Root)S 224 x(bridge)S
225 x(\(being)S 225 x(in\211nitely)S 226 x(wise\),)S 238 x(looks)S
225 x(at)S 224 x(all)S 224 x(these)S 225 x("Path)S 224 x(to)S 598 y
5991 X(Root")S 282 x(costs,)S 312 x(and)S 284 x(instructs)S 282 x(T)S
-30 x(ranslan)S 283 x(#2)S 283 x(to)S 283 x(put)S 283 x(Port)S 283 x
(3)S 283 x(into)S 283 x("Backup")S 598 y 5991 X(state,)S 313 x
(breaking)S 286 x(the)S 284 x(loop,)S 314 x(and)S 284 x(keeping)S
286 x(the)S 284 x("Spanning)S 285 x(T)S -31 x(ree")S 284 x(topology)S
598 y 5991 X(intact.)S 214 x(A)S 144 x(link)S 144 x(in)S 144 x
("BACKUP")S 143 x(state)S 143 x(will)S 143 x(NOT)S 143 x(pass)S 143 x
(packets)S 144 x(between)S 144 x(nodes,)S 597 y 5991 X(but)S 227 x
(can)S 227 x(still)S 226 x(carry)S 228 x(special)S 227 x("Bridge)S
227 x(Management")S 227 x(\(Protocol)S 228 x(type)S 227 x(80-80\))S
598 y 5991 X(messages.)S 454 x(In)S 243 x(the)S 244 x(event)S 245 x
(that)S 243 x(the)S 244 x("Primary")S 244 x(path)S 243 x(to)S 244 x
(the)S 243 x(Root)S 244 x(breaks,)S 598 y 5991 X(the)S 171 x(link)S
172 x(between)S 171 x(T)S -31 x(ranslans)S 171 x(2)S 171 x(and)S
171 x(3)S 171 x(can)S 172 x(come)S 171 x(out)S 171 x(of)S 171 x
("Backup",)S 173 x(assuring)S 598 y 5991 X(continued)S 201 x
(communication)S 200 x(between)S 199 x(all)S 200 x(Segments.)S 322 x
(If)S 199 x(the)S 200 x("Primary")S 200 x(link)S 597 y 5991 X(is)S
185 x(later)S 185 x(restored,)S 190 x(the)S 186 x(path)S 185 x
(between)S 185 x(T)S -30 x(ranslans)S 185 x(2)S 185 x(and)S 186 x(3)S
185 x(will)S 185 x(again)S 186 x(revert)S 598 y 5991 X(to)S 166 x
("Backup".)S 11142 Y 5991 X(As)S 158 x(mentioned)S 160 x(before,)S
161 x(the)S 160 x(Larger)S 160 x(an)S 159 x(extended)S 160 x(LAN,)S
160 x(the)S 159 x(more)S 159 x(T)S -30 x(ranslans,)S 598 y 5991 X
(The)S 253 x(more)S 252 x(complex)S 253 x(the)S 252 x(Spanning)S
253 x(T)S -30 x(ree)S 252 x(topology)S -55 x(.)S 481 x(GET)S 251 x
(A)S 252 x(TOPOLOGY)S 598 y 5991 X(MAP!!)S 250 x(T)S -31 x(rying)S
177 x(to)S 174 x(understand)S 176 x(or)S 175 x(troubleshoot)S 176 x
(an)S 175 x(Extended)S 176 x(LAN)S 174 x(without)S 598 y 5991 X(a)S
166 x(topology)S 167 x(MAP)S 166 x(can)S 167 x(be)S 166 x(an)S 166 x
(excercise)S 167 x(in)S 166 x(frustration.)S 14131 Y 4796 X F28
(3.2.1)S 300 x(Forget)S 200 x(everything)S 201 x(Y)S -45 x(ou've)S
201 x(learned-)S 200 x(BROUTERS)S 198 x(are)S 199 x(here!)S 15925 Y
5991 X F151(Got)S 174 x(Spanning)S 175 x(T)S -30 x(ree)S 174 x(down)S
175 x(pat,)S 176 x(eh?)S 247 x(I've)S 174 x(got)S 175 x(some)S 174 x
(bad)S 174 x(news.)S 246 x(Let')S -18 x(s)S 174 x(look)S 175 x(at)S
597 y 5991 X(our)S 200 x(topology)S 201 x(again,)S 209 x(but)S 200 x
(drop)S 199 x(the)S 200 x(T1)S 200 x(link)S 200 x(speed)S 200 x(to)S
199 x(56Kb,)S 208 x(like)S 200 x(the)S 200 x(other)S 598 y 5991 X
(links.)S 29901 Y 14383 X F152(The)S 166 x(V)S -31 x(italink)S 166 x
(T)S -44 x(ranslan)S 167 x(bridge)S 499 x(3\20319)S
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3975 Y 5991 X F36(Figu)S 2 x(re)S 165 x(3\2037:)S 498 x(T)S -27 x
(ranslan)S 167 x(DLS)S 166 x(\(Distributed)S 167 x(Lin)S 2 x(e)S
166 x(Sharing\))S 5084 Y 13523 X F98(#====+++====#)S 538 x(Ethernet)S
269 x(Segment)S 268 x(1)S 499 y 15137 X(|)S 498 y -269 x(|)S 498 y
12447 X(----------------------------------)S 498 y 14330 X(Port)S
269 x(1)S 269 x(\(Ethernet\))S 498 y 13254 X(Translan)S 269 x(III)S
269 x(\(Bridge)S 269 x(#1\))S 498 y 12447 X(Port)S 269 x(2)S 17289 X
(Port)S 269 x(3)S 19979 X(Port)S 269 x(4)S 498 y 12447 X
(----------------------------------)S 498 y 12716 X(/)S 17827 X(\\)S
20566 X(\\)S 499 y 11640 X(Modem)S 17289 X(Modem)S 19979 X(Modem)S
498 y 11909 X(/)S 18096 X(\\)S 20835 X(\\)S 498 y 10295 X(56Kb)S
538 x(\\)S 18145 X(/)S 538 x(56Kb)S 807 x(/)S 538 x(56Kb)S 498 y
11909 X(/)S 18365 X(\\)S 20835 X(\\)S 498 y 11640 X(/)S 18634 X(\\)S
21104 X(\\)S 498 y 10564 X(Modem)S 18365 X(Modem)S 20786 X(Modem)S
498 y 11102 X(/)S 19441 X(\\)S 21642 X(\\)S 499 y 5991 X
(------------------------)S 14330 X(56Kb)S 269 x(Link)S 19710 X
(-------------------------)S 498 y 7336 X(Port)S 269 x(2)S 12447 X
(|)S 14330 X(\(In)S 269 x(BACKUP\))S 19441 X(|)S 269 x(Port)S 269 x
(2)S 806 x(Port)S 269 x(3)S 498 y 5991 X(Translan)S 269 x(III)S 269 x
(\(Bridge)S 269 x(#2\)|---------/)S 807 x(/-----------|)S 269 x
(Translan)S 268 x(350)S 269 x(\(Bridge)S 269 x(#3\))S 498 y 7336 X
(Port)S 269 x(1)S 269 x(\(Ethernet\))S 538 x(|Port)S 269 x(3)S 17827 X
(Port)S 269 x(4|-------------------------)S 498 y 5991 X
(------------------------)S 20517 X(|)S 269 x(Port)S 268 x(1)S 269 x
(\(Ethernet\))S 498 y 10295 X(|)S 20517 X(|)S 498 y 10295 X(|)S
20517 X(|)S 498 y 8412 X(#=====+++========+++===#)S 17020 X
(#==========+++======+++=======#)S 499 y 8950 X(Segment)S 269 x(2)S
13254 X(|)S 18365 X(Segment)S 269 x(3)S 22668 X(|)S 498 y 13254 X(|)S
22668 X(|)S 498 y 12447 X(-------)S 21862 X(-------)S 498 y 12716 X
(VAX)S 269 x(X)S 22130 X(VAX)S 269 x(Z)S 20626 Y 5991 X F151(As)S
205 x(you)S 206 x(can)S 206 x(see,)S 216 x(we)S 205 x(have)S 207 x
(a)S 205 x(beautiful)S 206 x(Spanning)S 207 x(T)S -31 x(ree)S 206 x
(topology)S -54 x(,)S 216 x(with)S 205 x(NO)S 598 y 5991 X(loops.)S
482 x(And)S 253 x(the)S 253 x(lower)S 253 x(link)S 254 x(speed)S
252 x(between)S 253 x(T)S -30 x(ranslans)S 253 x(1)S 253 x(and)S
253 x(2)S 253 x(doesn')S -10 x(t)S 598 y 5991 X(change)S 242 x(that)S
241 x(topology-)S 241 x(the)S 241 x(Link)S 242 x(between)S 240 x
(translans)S 241 x(2)S 240 x(&)S 241 x(3)S 241 x(will)S 240 x(still)S
240 x(go)S 597 y 5991 X(into)S 166 x(Backup.)S 223 x(But)S 165 x
(let')S -19 x(s)S 166 x(examine)S 167 x(some)S 165 x(implications)S
166 x(of)S 166 x(this)S 165 x(topology)S -54 x(.)S 897 y 5991 X(If)S
127 x(V)S -55 x(AX)S 126 x(X)S 127 x(sends)S 128 x(a)S 127 x(packet)S
128 x(to)S 127 x(V)S -55 x(AX)S 126 x(Z,)S 129 x(that)S 127 x
(packet)S 128 x(will)S 127 x(need)S 127 x(to)S 128 x(travel)S 128 x
(through)S 598 y 5991 X(one)S 116 x(56Kb)S 115 x(link)S 116 x(to)S
115 x(T)S -31 x(ranslan)S 116 x(1,)S 126 x(then)S 116 x(throug)S
2 x(h)S 115 x(a)S 116 x(second)S 115 x(56Kb)S 115 x(link)S 116 x(to)S
116 x(T)S -31 x(ranslan)S 598 y 5991 X(3.)S 220 x(Even)S 160 x(if)S
160 x(we)S 159 x(forget)S 160 x(about)S 160 x(the)S 160 x(time)S
159 x(spent)S 160 x(by)S 160 x(T)S -31 x(ranslan)S 160 x(#1)S 160 x
(examining)S 161 x(the)S 597 y 5991 X(packet,)S 143 x(and)S 136 x
(deciding)S 136 x(to)S 136 x(forward)S 136 x(it)S 135 x(to)S 136 x
(T)S -31 x(ranslan)S 136 x(3,)S 143 x(it)S 135 x(still)S 135 x(will)S
135 x(take)S 136 x(twice)S 136 x(as)S 598 y 5991 X(long)S 140 x(for)S
140 x(the)S 139 x(packet)S 140 x(to)S 139 x(get)S 139 x(between)S
139 x(bridges)S 140 x(2)S 139 x(&)S 139 x(3)S 139 x(as)S 139 x(it)S
139 x(would)S 139 x(if)S 139 x(T)S -30 x(ranslan)S 139 x(2)S 598 y
5991 X(could)S 156 x(send)S 156 x(it)S 156 x(DIREC)S -2 x(TL)S -45 x
(Y)S 156 x(to)S 155 x(T)S -30 x(ranslan)S 156 x(3)S 156 x(over)S
157 x(the)S 156 x(BACKUP)S 155 x(link.)S 219 x(But)S 156 x(this)S
598 y 5991 X(is)S 137 x(impossible,)S 143 x(right?)S 213 x(It)S 137 x
(would)S 138 x(V)S -22 x(iolate)S 137 x(Spanning)S 139 x(T)S -30 x
(ree)S 138 x(to)S 138 x(use)S 137 x(the)S 139 x(BAC)S -2 x(KUP)S
597 y 5991 X(link!)S 29901 Y 4796 X F152(3\20320)S 498 x(The)S 166 x
(V)S -31 x(italink)S 166 x(T)S -44 x(ranslan)S 167 x(bridge)S
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3969 Y 5991 X F151(W)S -28 x(ell,)S 251 x(V)S -23 x(italink)S 234 x
(came)S 233 x(up)S 233 x(with)S 233 x(something)S 234 x(they)S 234 x
(call)S 233 x(DLS,)S 233 x(or)S 233 x(Distributed)S 598 y 5991 X
(Load)S 247 x(Sharing.)S 465 x(What)S 246 x(DLS)S 247 x(does)S 246 x
(is)S 246 x(to)S 247 x(utilize)S 246 x(a)S 247 x(link)S 247 x(which)S
247 x(is)S 246 x(in)S 247 x("STP)S 598 y 5991 X(Backup")S 173 x
(mode,)S 176 x(to)S 173 x(forward)S 173 x(packets)S 173 x(between)S
173 x(bridges,)S 176 x(rather)S 174 x(than)S 173 x(forcing)S 598 y
5991 X(the)S 240 x(packet)S 239 x(to)S 239 x(take)S 240 x(the)S 239 x
(long)S 240 x(way)S 240 x(around.)S 442 x(Strictly)S 239 x
(speaking,)S 259 x(they)S 240 x(DO)S 597 y 5991 X(violate)S 131 x
(Spanning)S 133 x(T)S -31 x(ree)S 131 x(protocol.)S 211 x(But)S 131 x
(Looping)S 132 x(of)S 131 x(packets)S 131 x(is)S 131 x(still)S 130 x
(prevented,)S 598 y 5991 X(because)S 147 x(the)S 148 x(bridges)S
147 x(make)S 147 x(sure)S 147 x(that)S 147 x(the)S 147 x(ONL)S -46 x
(Y)S 147 x(traf\211c)S 147 x(forwarded)S 147 x(over)S 148 x(the)S
598 y 5991 X(DLS)S 138 x(link)S 140 x(is)S 138 x(traf\211c)S 139 x
(which)S 139 x(is)S 139 x(NOT)S 138 x(sent)S 139 x(over)S 139 x(the)S
139 x(main)S 139 x(Spanning)S 140 x(T)S -30 x(ree)S 139 x(path.)S
598 y 5991 X(The)S 208 x(rule)S 208 x(used)S 208 x(by)S 207 x(the)S
208 x(bridge)S 208 x(in)S 208 x(determining)S 208 x(whether)S 208 x
(or)S 208 x(not)S 207 x(to)S 208 x(make)S 207 x(a)S 597 y 5991 X
(link)S 167 x(a)S 166 x(DLS)S 165 x(path)S 166 x(is)S 166 x(simply:)S
897 y 5991 X(\201)S 595 x(If)S 133 x(the)S 133 x(Path)S 134 x(Cost)S
133 x(of)S 133 x(a)S 133 x("STP)S 134 x(Backup")S 133 x(link)S 134 x
(between)S 133 x(two)S 133 x(bridges)S 134 x(is)S 133 x(LESS)S 598 y
6888 X(than)S 169 x(the)S 168 x(Normal)S 169 x(STP)S 169 x(path)S
168 x(between)S 168 x(those)S 169 x(Bridges,)S 169 x(then)S 169 x
(that)S 169 x(link)S 169 x(is)S 598 y 6888 X(a)S 166 x(candidate)S
166 x(for)S 166 x(DLS.)S 896 y 5991 X(In)S 147 x(the)S 148 x
(previous)S 148 x(\211gure,)S 153 x(the)S 147 x(STP)S 147 x(path)S
148 x(between)S 147 x(T)S -31 x(ranslan)S 148 x(2)S 147 x(and)S 147 x
(T)S -30 x(ranslan)S 147 x(3)S 598 y 5991 X(has)S 149 x(a)S 150 x
(cost)S 148 x(of)S 150 x(\(1785)S 149 x(+)S 149 x(1)S 149 x(+)S 149 x
(892)S
(\))S 149 x(2678)S 149 x(.)S 217 x(The)S 150 x(Backup)S 149 x(link)S
150 x(has)S 150 x(a)S 149 x(cost)S 149 x(of)S 149 x(1785,)S 598 y
5991 X(and)S 166 x(thus)S 166 x(is)S 166 x(a)S 166 x(candidate)S
166 x(for)S 166 x(DLS.)S 896 y 5991 X(If)S 186 x(the)S 187 x(link)S
187 x(between)S 186 x(T)S -30 x(ranslan)S 187 x(1)S 186 x(and)S 187 x
(2)S 187 x(was)S 185 x(T1,)S 193 x(as)S 186 x(in)S 187 x(previous)S
187 x(examples,)S 598 y 5991 X(the)S 151 x(STP)S 151 x(path)S 150 x
(cost)S 151 x(would)S 150 x(be)S 151 x(\(64)S 150 x(+)S 150 x(1)S
151 x(+)S 150 x(892\))S 151 x(957.)S 216 x(Since)S 151 x(this)S 151 x
(is)S 150 x(a)S 150 x(lower)S 151 x(cost)S 598 y 5991 X(than)S 181 x
(the)S 181 x(Backup)S 180 x(link)S 181 x(\(1785\),)S 185 x(the)S
180 x(backup)S 181 x(link)S 181 x(would)S 181 x(not)S 180 x(be)S
181 x(a)S 180 x(candidate)S 598 y 5991 X(for)S 166 x(DLS.)S 17419 Y
5991 X(For)S 123 x(a)S 122 x(more)S 122 x(intelligent)S 123 x
(discussion)S 121 x(of)S 122 x(DLS,)S 122 x(and)S 123 x(some)S 122 x
(frighteningly)S 124 x(complex)S 598 y 5991 X(topology)S 167 x
(examples,)S 166 x(refer)S 167 x(to)S 166 x(the)S 166 x(addendum.)S
29901 Y 14383 X F152(The)S 166 x(V)S -31 x(italink)S 166 x(T)S -44 x
(ranslan)S 167 x(bridge)S 499 x(3\20321)S
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4796 16607 XY F22(A)S 299 y -465 x 7776 24 R 548 y 4796 X F155
(Additional)S 151 x(reading,)S 349 x(ii)S 548 y 4796 X(Address)S
548 y 5393 X(Filteri)S 2 x(ng,)S 348 x(3\20313)S 548 y 5393 X
(Multica)S 2 x(st)S 548 y 6290 X(Broadcast,)S 349 x(1\2031)S -24 x
(1)S 548 y 4796 X(Address,)S 148 x(DECNET)S 149 x(Ethernet,)S 349 x
(1)S
(\2031)S -24 x(1)S 548 y 4796 X(Address,)S 148 x(Ethernet,)S 349 x
(1)S
(\20310)S 548 y 4796 X(Address,)S 170 x(Globally)S 167 x
(administered,)S 548 y 5991 X(1\2031)S -24 x(1)S 548 y 4796 X
(Address,)S 143 x(Locally)S 143 x(administered,)S 344 x(1\2031)S
-24 x(1)S 548 y 4796 X(ALOHANET,)S 348 x(1\2031)S 23986 Y 4796 X F22
(B)S 299 y -465 x 7776 24 R 548 y 4796 X F155(Backup)S 149 x(Root)S
548 y 5393 X(T)S -27 x(ranslan,)S 348 x(3\20316)S 548 y 4796 X
(Barrel)S 149 x(connectors,)S 349 x(2\2031)S 548 y 4796 X(Blue)S
149 x(Book,)S 149 x(the,)S 349 x(1\2032)S 548 y 4796 X(Bottleneck,)S
150 x(T)S -42 x(elco,)S 349 x(3\2034)S 548 y 4796 X(Bridge)S 11205 Y
14957 X(Bridge)S 150 x(\(cont'd)S 2 x(.\))S 640 y 15555 X
(Metrowave,)S 349 x(3\2032)S 548 y 15555 X(Root)S 150 x
(de\211nition,)S 350 x(2\20314)S 548 y 14957 X(Bridge,)S 150 x
(LB100,)S 348 x(2\2037)S 548 y 14957 X(Broadcast)S 151 x(address,)S
348 x(1\2031)S -24 x(1)S 548 y 15555 X(TCPIP)S 150 x(and,)S 349 x
(2\2031)S -24 x(1)S 548 y 14957 X(Brouters,)S 349 x(3\20319)S 300 x
(to)S 299 x(3\20321)S 15659 Y 14957 X F22(C)S 299 y -504 x
7776 24 R 548 y 14957 X F155(Cable)S 548 y -589 x(T)S -32 x(wisted)S
150 x(pair)S 548 y 16452 X(Thinwire,)S 348 x(1\2038)S 548 y 14957 X
(Cables)S 548 y -797 x(Coaxial,)S 349 x(1\2035)S 548 y 15555 X
(Ethernet)S 150 x(Thickwire)S 547 y 16452 X(Ethernet)S 150 x(T)S
-32 x(wisted)S 150 x(Pair)S 548 y 17348 X(Ethernet)S 151 x
(Thinwire,)S 348 x(1\2035)S 548 y 14957 X(Carrier)S 150 x(Detect)S
151 x(Check,)S 348 x(1\2037)S 548 y 14957 X(Cheapernet,)S 350 x
(1\2038)S 548 y 14957 X(Cheese,)S 149 x(Big,)S 348 x(2\20314)S 548 y
14957 X(Coaxial)S 150 x(cable,)S 350 x(1\2035)S 548 y 14957 X
(Collision)S 548 y 15555 X(De\211nition)S 150 x(of,)S 349 x(1\2034)S
548 y 15555 X(on)S 150 x(ALOHANET,)S 348 x(1\2032)S 548 y 14957 X
(Collisions)S 548 y 15555 X(T)S -28 x(ranceiver)S 150 x(dete)S 2 x
(ction,)S 349 x(1\2036)S 548 y 14957 X(Cost,)S 149 x(root)S 150 x
(path,)S 350 x(2\20316)S 548 y 14957 X(Cost)S 150 x(to)S 150 x(root)S
548 y 15555 X(T)S -28 x(ranslan,)S 349 x(3\20318)S 548 y 14957 X
(CSMA-CD,)S 349 x(1\2034)S
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20921 29901 XY F152(Index\2031)S
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%%DOC$Page: INDEX-2 65
1000 BP 39600 30600 PM 0 0 XY
4603 Y 4796 X F22(D)S 299 y -504 x 7776 24 R 548 y 4796 X F155
(DECconnect,)S 348 x(iii)S 547 y 4796 X(DECconnect)S 149 x(guide,)S
348 x(1\2037,)S 150 x(2\2034)S 548 y 4796 X(DECNET)S 148 x(Ethernet)S
150 x(address,)S 349 x(1\2031)S -24 x(1)S 548 y 4796 X(DEC)S 148 x
(STD)S 150 x(134,)S 349 x(ii,)S 149 x(1\2032,)S 150 x(1\2037,)S 150 x
(2)S
(\2034)S 548 y 4796 X(Delay)S 548 y -607 x(Through)S 149 x(T)S -27 x
(ranslan,)S 348 x(3\2034)S 548 y 4796 X(Delay)S -50 x(,)S 149 x
(propogati)S 2 x(on,)S 348 x(1\2037)S 548 y 4796 X(DELNI,)S 348 x
(2\2035)S 548 y 4796 X(DERE)S -2 x(P,)S 349 x(2\2033)S 299 x(to)S
300 x(2\2036)S 548 y 4796 X(Digression,)S 148 x(RBMS,)S 348 x
(2\20320)S 548 y 4796 X(DIP)S 149 x(Switches,)S 150 x(LB100,)S 349 x
(2)S
(\20318)S 548 y 4796 X(Distributed)S 166 x(Line)S 165 x(Sharing)S
166 x(\(DLS\),)S 548 y 5991 X(3\20319)S 300 x(to)S 299 x(3\20321)S
548 y 4796 X(DNA)S 548 y -441 x(Layers,)S 348 x(1\2033)S 548 y 4796 X
(Don)S 149 x(Corleone,)S 349 x(2\20314)S 548 y 4796 X(DS1,)S 348 x
(3)S
(\2032)S 15269 Y 4796 X F22(E)S 299 y -465 x 7776 24 R 548 y 4796 X
F155(Ethernet,)S 349 x(1\2032)S 548 y 5393 X(Addresses,)S 348 x
(1\20310)S 548 y 5393 X(Barrel)S 150 x(connectors,)S 349 x(2\2031)S
300 x(to)S 299 x(2\2033)S 548 y 5393 X(Cable)S 150 x(types,)S 349 x
(1)S
(\2035)S 548 y 5393 X(Distance)S 150 x(limitati)S 2 x(on,)S 348 x
(1\2037)S 548 y 5393 X(Linking)S 150 x(Segments,)S 149 x(intro,)S
349 x(2\2031)S 548 y 5393 X(Packet,)S 349 x(2\2031)S -24 x(1)S 548 y
5393 X(Packet)S 150 x(descript)S 2 x(ion,)S 348 x(1\2039)S 548 y
5393 X(Preamble,)S 349 x(1\2039)S 547 y 5393 X(Protocol)S 151 x
(types,)S 348 x(1\20312)S 548 y 5393 X(Repeaters,)S 349 x(2\2033)S
300 x(to)S 299 x(2\2036)S 548 y 5393 X(T)S -27 x(ranceiver,)S 348 x
(1)S
(\2036)S 548 y 5393 X(T)S -32 x(wisted)S 150 x(pair)S 548 y 6290 X
(Thinwire,)S 349 x(1\2038)S 548 y 4796 X(Ethernet)S 150 x(Packet,)S
349 x(1\2039,)S 150 x(2\2031)S -24 x(1)S 24840 Y 4796 X F22(F)S 299 y
-426 x 7776 24 R 548 y 4796 X F155(File)S 150 x(T)S -28 x(ransfers)S
547 y 5393 X(over)S 150 x(T)S -28 x(ranslan,)S 349 x(3\20312)S 4625 Y
14957 X F22(G)S 299 y -543 x 7776 24 R 547 y 14957 X F155(Globall)S
2 x(y)S 169 x(administered)S 171 x(address,)S 548 y 16153 X(1\2031)S
-24 x(1)S 7072 Y 14957 X F22(H)S 299 y -504 x 7776 24 R 548 y 14957 X
F155(H400)S 2 x(0,)S 348 x(1\2036)S 548 y 14957 X(H400)S 2 x(5,)S
348 x(1\2037)S 548 y 14957 X(Handshaking,)S 349 x(1\2031,)S 150 x
(1\2035)S 548 y 14957 X(Hard)S 2 x(ware)S 149 x(Description,)S 150 x
(LB100,)S 349 x(2\20317)S 548 y 14957 X(Heart)S 2 x(beat)S 547 y
15555 X(802.3,)S 349 x(1\20315)S 548 y 15555 X(De\211nition,)S 349 x
(1)S
(\2037)S 548 y 14957 X(Hello)S 151 x(message,)S 148 x(STP,)S 349 x
(2)S
(\20314)S 12807 Y 14957 X F22(I)S 299 y -194 x 7776 24 R 548 y 14957 X
F155(ISO)S 548 y -215 x(Layers,)S 348 x(1\2033)S 15254 Y 14957 X F22
(J)S 299 y -349 x 7776 24 R 548 y 14957 X F155(Jam,)S 150 x
(de\211nition,)S 349 x(1\2038)S 548 y 14957 X(Jam,)S 150 x(the,)S
348 x(1\2034)S 17701 Y 14957 X F22(L)S 299 y -388 x 7776 24 R 548 y
14957 X F155(LAN)S 150 x(Bridge)S 150 x(100)S 548 y 15555 X(Address)S
149 x(learning,)S 349 x(2\20312)S 548 y 15555 X(DIP)S 150 x
(switches,)S 348 x(2\20318)S 548 y 15555 X(Hardware)S 151 x
(description,)S 350 x(2\20317)S 548 y 15555 X(Kissing)S 149 x
(babies)S 548 y 16452 X(Pizza,)S 149 x(eating,)S 349 x(2\20314)S
548 y 15555 X(LED')S -16 x(s,)S 347 x(2\20318)S 548 y 15555 X(Loop)S
150 x(Detectio)S 2 x(n,)S 348 x(2\20314)S 548 y 15555 X(Node)S 151 x
(address)S 149 x(table)S 2 x(,)S 348 x(2\20312)S 548 y 15555 X
(Power)S 150 x(up)S 149 x(sequence,)S 349 x(2\20319)S 548 y 15555 X
(Spanning)S 150 x(T)S -27 x(ree)S 149 x(and,)S 349 x(2\20314)S 548 y
15555 X(T)S -41 x(echnical)S 150 x(Specs,)S 349 x(2\20317)S 548 y
14957 X(LAN)S 137 x(Bridge)S 136 x(100,)S 139 x(general)S 137 x
(descripti)S 2 x(on,)S 548 y 16153 X(2\2037)S 547 y 14957 X
(LANland,)S 150 x(happiness)S 150 x(in,)S 348 x(3\2031)S -23 x(1)S
548 y 14957 X(LA)S -50 x(VC)S 548 y -623 x(T)S -28 x(ranslan)S 150 x
(and,)S 349 x(3\2034)S 548 y 14957 X(Layer)S 29901 Y 4796 X F152
(Index\2032)S
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%%DOC$Page: INDEX-3 66
1000 BP 39600 30600 PM 0 0 XY
3932 Y 4796 X F155(Layer)S 149 x(\(cont'd)S 2 x(.\))S 640 y 5393 X
(Data)S 150 x(link)S 548 y 6290 X(Physical,)S 348 x(1\2033)S 548 y
4796 X(LED')S -17 x(s,)S 149 x(LB100,)S 348 x(2\20318)S 548 y 4796 X
(Locally)S 150 x(administered)S 150 x(address,)S 349 x(1\2031)S -24 x
(1)S 548 y 4796 X(Loop)S 150 x(detectio)S 2 x(n)S 548 y 5393 X(T)S
-27 x(ranslan,)S 348 x(3\20317)S 8365 Y 4796 X F22(M)S 298 y -581 x
7776 24 R 548 y 4796 X F155(Metrowave)S 150 x(Bridge,)S 348 x
(3\2032)S 548 y 4796 X(Multicast)S 150 x(address,)S 349 x(1\2031)S
-24 x(1)S 10812 Y 4796 X F22(N)S 299 y -504 x 7776 24 R 548 y 4796 X
F155(Network)S 150 x(Groups,)S 348 x(3\2039)S 548 y 4796 X(Node)S
150 x(Address)S 149 x(T)S -28 x(ables)S 547 y 5393 X(T)S -27 x
(ranslans)S 149 x(and,)S 349 x(3\2036)S 548 y 4796 X(Nutshell)S 548 y
5393 X(LAN)S 150 x(Bridge)S 149 x(100,)S 350 x(2\2037)S 548 y 5393 X
(LB100,)S 150 x(Larger,)S 348 x(2\2038)S 548 y 5393 X(Spanning)S
150 x(T)S -27 x(ree)S 150 x(Protocol,)S 349 x(2\20314)S 548 y 5393 X
(T)S -27 x(ranslan)S 149 x(Bridge,)S 349 x(3\2031)S 16547 Y 4796 X
F22(P)S 299 y -465 x 7776 24 R 548 y 4796 X F155(Packet)S 547 y -814 x
(802.3,)S 349 x(1\20314)S 548 y 5393 X(Store)S 151 x(and)S 150 x
(Forward,)S 349 x(2\2037)S 548 y 4796 X(Packet,)S 149 x(descripti)S
2 x(on,)S 348 x(1\2039)S 548 y 4796 X(Packet,)S 149 x(Ethernet,)S
349 x(1\2039,)S 150 x(2\2031)S -24 x(1)S 548 y 4796 X(Parallel)S
150 x(links)S 548 y 5393 X(Cost)S 150 x(to)S 149 x(root,)S 350 x
(3\20318)S 548 y 4796 X(Parallel)S 150 x(links)S 150 x(w/T)S -29 x
(ranslan,)S 349 x(3\2038)S 548 y 4796 X(Power)S 149 x(up)S 150 x
(Sequence,)S 150 x(LB100,)S 349 x(2\20319)S 548 y 4796 X(Preamble,)S
349 x(1\2039)S 548 y 4796 X(Protocol)S 150 x(T)S -23 x(ypes,)S 348 x
(1)S
(\20312)S 23926 Y 4796 X F22(R)S 298 y -504 x 7776 24 R 548 y 4796 X
F155(RBMS)S 548 y -756 x(And)S 150 x(LB100,)S 348 x(2\2039)S 548 y
5393 X(Digression)S 149 x(on,)S 349 x(2\20320)S 548 y 5393 X(User)S
25 x(')S -16 x(s)S 149 x(Guide,)S 349 x(iii)S 548 y 4796 X(Reading,)S
149 x(technical,)S 349 x(ii)S 548 y 4796 X(Repeaters,)S 149 x
(Ethernet,)S 349 x(2\2033)S 300 x(to)S 299 x(2\2036)S 548 y 4796 X
(Root)S 3932 Y 14957 X(Root)S 150 x(\(cont')S 2 x(d.\))S 605 y 15555 X
(root)S 150 x(priorit)S 2 x(y,)S 348 x(2\20316)S 548 y 14957 X
(Root,)S 150 x(backup,)S 349 x(3\20316)S 548 y 14957 X(Root)S 150 x
(priorit)S 2 x(y)S 548 y 15555 X(T)S -28 x(ranslan)S 150 x(and,)S
349 x(3\20314)S 548 y 14957 X(RS-449)S 2 x(,)S 348 x(3\2032)S 7803 Y
14957 X F22(S)S 299 y -465 x 7776 24 R 548 y 14957 X F155(Spanni)S
2 x(ng)S 149 x(T)S -28 x(ree)S 150 x(Protocol,)S 349 x(2\20314)S
548 y 15555 X(T)S -28 x(ranslan,)S 349 x(3\20313)S 300 x(to)S 299 x
(3)S
(\20319)S 548 y 14957 X(SQE,)S 349 x(1\20315)S 548 y 14957 X(SQMS)S
151 x(queue)S 548 y 15555 X(De\211nition,)S 349 x(3\20313)S 548 y
14957 X(Store)S 151 x(and)S 150 x(Forward,)S 349 x(2\2037)S 548 y
14957 X(STP)S 548 y -282 x(Hello)S 151 x(message,)S 347 x(2\20314)S
548 y 15555 X(T)S -28 x(ranslan,)S 349 x(3\20313)S 300 x(to)S 299 x
(3)S
(\20319)S 548 y 14957 X(SUN)S 151 x(Nodes,)S 349 x(2\20310)S 14634 Y
14957 X F22(T)S 299 y -426 x 7776 24 R 548 y 14957 X F155(T1,)S 349 x
(3)S
(\2032)S 548 y 14957 X(T)S -27 x(ap,)S 149 x(V)S -41 x(ampire,)S
349 x(1\2036)S 548 y 14957 X(TCPIP,)S 349 x(2\2031)S -24 x(1)S 548 y
14957 X(TDR,)S 348 x(1\2036)S 548 y 14957 X(T)S -41 x(elco)S 150 x
(bottl)S 2 x(eneck,)S 348 x(3\2034)S 548 y 14957 X(Thinwire)S 150 x
(cable,)S 349 x(1\2038)S 548 y 14957 X(T)S -11 x(ime)S 150 x(Domain)S
149 x(Re\212ectometer,)S 349 x(1\2036)S 548 y 14957 X(T)S -27 x
(ranceiver)S 548 y 15555 X(802.3,)S 349 x(1\20315)S 548 y 15555 X
(Description,)S 349 x(1\2036)S 547 y 15555 X(Heartb)S 2 x(eat,)S
349 x(1\2037)S 548 y 14957 X(T)S -27 x(ranslan)S 548 y 15555 X
(Address)S 149 x(learning,)S 349 x(3\2036)S 548 y 15555 X(Backup)S
150 x(Root)S 150 x(de\211nition,)S 349 x(3\20316)S 548 y 15555 X
(Cost)S 149 x(to)S 150 x(root,)S 349 x(3\20318)S 548 y 15555 X(DLS,)S
349 x(3\20319)S 300 x(to)S 299 x(3\20321)S 548 y 15555 X(File)S 150 x
(transfers)S 150 x(and,)S 349 x(3\20312)S 548 y 15555 X(LA)S -50 x
(VC)S 149 x(and,)S 349 x(3\2034)S 548 y 15555 X(Loop)S 150 x(detect)S
2 x(ion,)S 348 x(3\20317)S 548 y 15555 X(Network)S 150 x(Groups,)S
349 x(3\2039)S 548 y 15555 X(Overview,)S 348 x(3\2031)S 300 x(to)S
299 x(3\2032)S 548 y 15555 X(Parallel)S 151 x(links)S 149 x(and,)S
349 x(3\2038)S 548 y 15555 X(Root)S 150 x(priority,)S 349 x(3\20314)S
29901 Y 20921 X F152(Index\2033)S
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%%DOC$Page: INDEX-4 67
1000 BP 39600 30600 PM 0 0 XY
3932 Y 4796 X F155(T)S -28 x(ranslan)S 149 x(\(cont')S 2 x(d.\))S
605 y 5393 X(Spanning)S 152 x(T)S -28 x(ree)S 152 x(Protocol,)S 352 x
(3)S
(\20313)S 303 x(to)S 548 y 6589 X(3\20319)S 548 y 4796 X(T)S -28 x
(ranslan)S 149 x(IV)S 150 x(difference)S 2 x(s,)S 347 x(3\2032)S
548 y 4796 X(T)S -32 x(wisted)S 150 x(pair)S 150 x(cable,)S 349 x
(1\2038)S 7233 Y 4796 X F22(U)S 299 y -504 x 7776 24 R 548 y 4796 X
F155(UNIX)S 150 x(nodes,)S 348 x(2\20310)S 4603 Y 14957 X F22(V)S
299 y -465 x 7776 24 R 548 y 14957 X F155(V)S -58 x(.35,)S 349 x
(3\2032)S 547 y 14957 X(V)S -41 x(ampire,)S 349 x(1\2036)S 7050 Y
14957 X F22(W)S 299 y -658 x 7776 24 R 548 y 14957 X F155(W)S -24 x
(ebsters,)S 348 x(ii)S 8949 Y 14957 X F22(X)S 299 y -465 x
7776 24 R 548 y 14957 X F155(Xerox,)S 348 x(1\20310)S 548 y 14957 X
(XEROX)S 548 y 15555 X(P)S -33 x(ARC,)S 347 x(1\2032)S 29901 Y 4796 X
F152(Index\2034)S
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%%Trailer
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