| Title: | DEChub/HUBwatch/PROBEwatch CONFERENCE |
| Notice: | Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7 |
| Moderator: | NETCAD::COLELLA DT |
| Created: | Wed Nov 13 1991 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 4455 |
| Total number of notes: | 16761 |
Hi..
I was looking for some clarifiaction on the configuration of the HUB
family of network items and read some alarming notes on what can and can't
be placed in a HUB900.
We have the task of configuring a customers remote network of 18
buildings (4 major groups) and had hoped to use a DECHUB 900 with bridges
feeding Hub90's and then spaning out from that point. One note I read
stated I could not place more thatn one bridge in the Hub900. This made me
think I might get away with putting the bridges in the Hub90's and the
repeaters in the Hub900. Is this feasible ?
Another point in question is the WAN source which we will receive from a
LB150 via fiber. Is thers a restriction on what it can feed ?. REv levels
and the assorted concerns.
We also need to get a demper hooked off a delni in the main building (
HUB900 area). Can this be done ? What are the restrictions other than the
300M rule ?
This LAN was designed by our MCS net person but he has now left for
greener pastures and we are left with the implementation. Originally the
bridges were in the HUB900 and we would like to keep them there since the
parts have been ordered. Again.. IS this supported ?
There is mention of this config in 1424, any clarification would help..
Thanks for any and all information .....
This note also posted in the ethernet conference (547) thanks..
RP = DEC900 Fiber Repeater
BD = DEC900/90 Fiber Bridge
LB = Lan Bridge 150
WAN = Wide are network source.
+----------+
| WAN | LB --------------------------------------+
+----------+ |
|
|
+----------------------+ |
| HUB900 | |
+-------+ |----------------------| |
|DELNI -----|RP | RP | RP | RP| BD | |
+-|-----+ | | | | | | |
+-----|-+ +-|---|----|----|-+--|-+ |
|DEMPER | | | | | | |
+-------+ | | | | +----------+
+------------+ | | +--------------------+
+|-----+ | +--+ +------|-+
|BD | | | | | |BD |
|------+ +----|-+ +-|----+ |--------|
|Hub90 | | |BD| |BD| | |Hub 90 |
+------+ |------| |------| +--------+
|Hub 90| |Hub 90|
+------+ +------+
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1497.1 | comments | CGOS01::DMARLOWE | Have you been HUBbed lately? | Fri Sep 30 1994 13:36 | 72 |
> feeding Hub90's and then spaning out from that point. One note I read
> stated I could not place more thatn one bridge in the Hub900. This made me
> think I might get away with putting the bridges in the Hub90's and the
> repeaters in the Hub900. Is this feasible ?
There is a note, not that far back that discusses how many 90/900
modules that can be put in a 900 hub. You could put up to 6 900EF
switches into a single hub.
You could have a central 900 feeding a 900 in each building. The
building 900's could then feed 90 hubs on each floor. Considering
the 200 node address in the 90 bridge, I would not use it to accept
the fiber coming from the central 900 hub.
> Another point in question is the WAN source which we will receive from a
> LB150 via fiber. Is thers a restriction on what it can feed ?. REv levels
> and the assorted concerns.
A LB150 does talk foirl or 10BaseFL so you will need another LB150
or a DECrepeater 200?? to handle this. Or get rid of the LB150
and use a DEFAR.
> We also need to get a demper hooked off a delni in the main building (
> HUB900 area). Can this be done ? What are the restrictions other than the
> 300M rule ?
Heartbeat must be disabled on the transceiver/MAU which means any other
devices will complain about missing heartbeat. Does really hurt
things like terminal servers, just increments a counter.
> This LAN was designed by our MCS net person but he has now left for
> greener pastures and we are left with the implementation. Originally the
> bridges were in the HUB900 and we would like to keep them there since the
> parts have been ordered. Again.. IS this supported ?
Yes, up to 6 because of power consumption of the 900EF's.
RP = DEC900 Fiber Repeater
BD = DEC900/90 Fiber Bridge
LB = Lan Bridge 150
WAN = Wide are network source.
+----------+
| WAN | LB --------------------------------------+
+----------+ |
|
+----------------------+ |
| HUB900 | |
+-------+ |----------------------| |
|DELNI -----|RP | RP | RP | RP| BD |<---------- will not talk to
+-|-----+ | | | | | | | a LB150.
+-----|-+ +-|---|----|----|-+--|-+ |
|DEMPER | | | | | | |
+-------+ | | | | +----------+
+------------+ | | +--------------------+
+|-----+ | +--+ +------|-+
|BD | | | | | |BD |
|------+ +----|-+ +-|----+ |--------|
|Hub90 | | |BD| |BD| | |Hub 90 |
+------+ |------| |------| +--------+
|Hub 90| |Hub 90|
+------+ +------+
Looks OK other than the LB150.
dave
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| 1497.2 | NETCAD::SLAWRENCE | Tue Oct 04 1994 16:52 | 11 | ||
The restriction is that you can't put more than one DECbridge 90 in any
hub because the workgroup side will become the network backbone and
they don't support that.
The configuration as diagramed can work.
You might compare the proposal to putting a DEFBR and a DEFMM in the
900 with DEFAR in each 90. All the bridging gets done in one
multi-port bridge that has much better reliability and management.
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