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Conference netcad::hub_mgnt

Title:DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:NETCAD::COLELLADT
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

365.0. "Decbridge 90 configuration" by TMAWKO::PRESSLEY (pin heads are people too...) Mon Aug 30 1993 17:30

A customer presently has three isolated thinwire segments he would like to
connect together.  He would like to use bridges in order to keep traffic
isolated.  Can the decbridge 90 be used in this scenerio?  I feel comfortable
using the decbridge 90 connecting two thinwire segments but the third 
gives me some discomfort.

Assumptions about the decbridge 90
1) two decbridge 90's can't be on the same thinwire segment.
2) the decbridge 90 is an end node bridge.

There are about 7 nodes on each segment.

Any help appreciated
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365.1It should workCSC32::B_GOODWINMon Aug 30 1993 18:255
    It should work fine. There are several publications that state the
    configuration is invalid, this is because of the 200 node limit on the
    work group side of the bridge. But since you have a limited number of
    node, approx 21, you should have no problem making this work.
    
365.2TMAWKO::PRESSLEYpin heads are people too...Wed Sep 01 1993 09:3112
The only reference I've seen to the end node bridge restriction is in the
Open DECconnect Catalog.  Just look in the contents for decbridge 90. It states,
" The DEWGB is an end-node bridge, that is, no other bridge can exist on the 
workgroup side of the DECbridge 90."

Is this bit of documentation incorrect?  From what I'm hearing from this
notes file it is!

I was also told that there was no way to set the root priority on the
decbridge 90.  That would mean that the bridge with the lowest e-net 
address would be the root bridge if all the bridges in your network were
decbridge 90's.
365.3CSC32::B_GOODWINWed Sep 01 1993 13:4210
The documentation tell you what is supported, but will it work? Yes. They put 
that statement in the guide because they don't want the DB90's to be
used a full blown bridges because before you know it, they customer has
exceeded the 200 node limit on the work group side of the bridge. But as long
as the 200 node limit isn't exceeded it will work fine in a multibridge config.

As far as I can see, there is no way to set any spanning tree params on the 
DB90 other than turning it on or off.

Brad