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Andrew,
> 1) Page 6-24, DECbridge 900MX port 3, "you can connect port 3 of the
> DECbridge 900MX to the Thinwire or any of the Ethernet flexible
> channels. You can only connect the other Ethernet ports to the
> Ethernet flexible channels."
> a) Does it mean, by default (without any configuration setup on the
> DECbridge 900MX), port 3 (1st UTP port) will be connected to Thinwire
> segment?
By default port 3 will face out the front. You need to point port 3 out
the back using the [configure] feature in HUBwatch. This is available
via the LAN Interconnect Window.
> b) Port 3 can be connected to any one of the 6 Ethernet flexible
> channels as well as Thinwire Segment while other Ethernet ports
> (2,4,5,6,7) can ONLY be configured to any one of the 6 Ethernet
> flexible channels BUT NOT TO Thinwire Segment?
Correct. Port 3 is special.
> c) Without any configuration set up, the FDDI ports (PHY A and PHY B)
> can be used to connect to external FDDI ring through the Front panel
> ports?
Correct. However in order to go through the DEChub 900's backplane you
need to configure the DECbridge 900MX via HUBwatch (create FDDI LAN, set
LIGO types, etc.).
> d) What is the default bridge priority of DECbridge 900MX?
It is 128.
> e) In a 'normal' bridge network environment, should DECbridge 900MX be
> the root bridge (if DECbridge 900MX plays a very important role in
> bridge network)?
Not sure I understand the question, but don't see any reason why a
DECbridge 900MX can't be the root bridge.
> 2) By default, port 1 of DECserver 900TM is configured to Thinwire
> Segment in DEChub900, can we put port 2 to another Ethernet flexible
> channels? Is there port grouping function with DECserver 900TM (P6-17,
> it seems to me that there are two ports (1 and 2) to DECserver 900TM?
There are 2 ports on the DECserver 900TM. Each of these ports can be
placed onto either the Thinwire or any of the Ethernet flexible
channels independantly. There is no port grouping function. You always
get 2 seperate ports. By default they are both placed onto the Thinwire.
Port 1 is used for "normal" operations such as connects and port 2 is used
for maintenance type operations such as downline load and upline dump. In
order to manage the DECserver 900TM it is important to remember that the
HUBwatch workstation must have network connectivity to the DECserver
900TM (through port 1), since it is not managed through IP Services.
> 3) In DECbridge 900MX manual Page 3:
> "When connected to a DEChub ONE docking station, one of the 10BASET
> pors (ports 3-6) can be switched to the DEChub ONE AUI connector.",
> could someone explain in more details? Does it mean, the AUI port of
> the DEChub ONE MUST be connected to DECbridge 900MX through any one of
> ports 3-6?
In a DEChub ONE one of the 10BASET ports can be switched to point out
the DEChub ONE's AUI port, similiar to pointing one of the ports to
the DEChub 900's backplane. It seems to me that this should be port 3,
rather than "any of the 10BASET ports", but I am not certain of that.
Someone care to confirm that?
Regards,
Bob
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| > e) In a 'normal' bridge network environment, should DECbridge 900MX be
> the root bridge (if DECbridge 900MX plays a very important role in
> bridge network)?
It would be a good idea to do so. In choosing the root for the spanning
tree, a couple of important considerations are: pick a robust,
high-performance bridge. It may decide how stable your network ends
up being. Secondly, pick a bridge in as central a place as possible,
directly connected to the backbone. Since the DB900 has an FDDI, it
will most likely end up being used as a backbone bridge.
> 3) In DECbridge 900MX manual Page 3:
> "When connected to a DEChub ONE docking station, one of the 10BASET
> pors (ports 3-6) can be switched to the DEChub ONE AUI connector.",
> could someone explain in more details? Does it mean, the AUI port of
> the DEChub ONE MUST be connected to DECbridge 900MX through any one of
> ports 3-6?
Only port 4 (not 3) can be switched to the ONE AUI connector.
(It doesn't matter much which port goes to the AUI as long as its one
of the 10BaseT ports, for media type conversion, and we picked this
one.) I'll try to make sure this is forwarded to the document author.
Anil
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| As I understand it, this pointing of port 4 to the HUB ONE AUI port is
simply to aid conversion to an AUI outlet - yes ?
If we don't point port 4 to the HUB ONE AUI, does this mean we have an 8
port bridge ? ie. 1 x FDDI, 6 ethernet (2 x AUI & 4 RJs) AND a further AUI
on the docking station ? Or is the latter AUI linked to one of the 6
ethernet segments ?
Confused...
Rog
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| The idea was that in stand-alone configuration. That is with
the DB900MX plugged into a DEChub ONE, we would have a configuration
of this HUB product that could directly replace a customer's DECbridge
600 series bridge. The DECbridge 600 series bridges have "3" AUI
ports along with the FDDI connections. Thus if we provide the ability
to direct one of the 10baseT ports of the DB900MX to the AUI port
available on the back of the DEChub ONE docking station, we have
provided some of our installed base customers with a replacement
bridge with far better performance than the DECbridge 600 generation
bridges, *AND* have also provided them with a migration path to our
HUB products. Makes sense eh?
Bob
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