From: Peter Simmons (psimmons@xxxxxxxxxxxxxx)
Date: Sun Jun 10 2001 - 15:26:57 GMT-3
Jim,
Have you got the "source-bridge spanning" command on the TR interfaces?
By default, NetBIOS uses spanning explorers, and SNA uses All-routes
explorers. If you don't use the IBM spanning tree protocol to build a
spanning tree path for STE explorers, then the interface drops them, as it
regards itself to be in "blocking" mode for these frames. Using the
"source-bridge spanning" command puts the interface automatically into
"forwarding" mode for the NetBIOS STE frames, and allows them to be
forwarded onto the DLSw process (or wherever else).
This is an SRB thing, as you've seen TB just forwards the frames as you
expect.
Try a "debug DLSw reach" before and after applying the command and see the
difference.....
Lots more info on this on CCO, search on "source-bridge spanning" as a
starter.
Hope this helps,
Regards
Pete S.
(Four days 'til Brussels.......)
-----Original Message-----
From: Jim Mathers <jmathers@inflow.com>
To: Jim Mathers <jmathers@inflow.com>; 'ccielab@groupstudy.com'
<ccielab@groupstudy.com>
Date: 17 June 2001 17:21
Subject: RE: question about NETBIOS, RIF fields, and DLSw+
>Further, I just changed the Token Ring interfaces from SRB to Transparent
>bridging by removing the statement "source-bridge 20 1 100" and adding the
>statement "bridge-group 20" on both of the routers and it works fine. I
also
>had to remove the "source-bridge ring-group 100" from the DLSw+ configs and
>add a "dlsw bridge-group 20". Now everything is working fine. I am forced
to
>assume that WIN98 is NOT generating a RIF, but instead is sending a NETBIOS
>name-query. I am still looking for feedback on this. Any help would be
>appreciated. Also, all Cisco documentation that I have read says that you
>have to do SRB for Token Ring. I guess that I am misunderstanding something
>because I am successfully doing transparent bridging between two remote
>Token-Rings. Any feedback? Please comment. Jim
>
>-----Original Message-----
>From: Jim Mathers
>Sent: Sunday, June 17, 2001 10:35 AM
>To: 'ccielab@groupstudy.com'
>Subject: question about NETBIOS, RIF fields, and DLSw+
>
>
>Hello,
>
>I have two hosts connected to two different MAUs that in turn connect to
two
>different routers via Token-Ring interfaces in my lab. The two routers are
>separated via an IP backbone. I have configured DLSw+ to bridge between the
>two Token Rings. The hosts are running WIN98 with only NETBEUI configured.
>When I click on Network Neighborhood, the hosts do not find each other. Nor
>does DLSw build a circuit from end to end. I get my DLSw+ Peers to connect
>fine. I have been troubleshooting this all night and after getting very
>frustrated, I pulled up the DLSw+ troubleshooting document on Cisco's web
>site. It says that it is possible that the Operating System (WIN 98) on my
>hosts will not generate a RIF, and, if this is the case, DLSw+ will fail
>because the router will look for a RIF on the incoming frames. If the
frames
>do not contain RIFs, then the router will not be able to source-route
bridge
>the packet onto the virtual ring. Has anyone seen this? I want to put this
>behind me. I just finally joined the list and thought it would be a good
>idea to bounce this of off the crowd. My lab is scheduled for September
23rd
>in San Jose. Thanks in advance.
>
>Jim Mathers
>**Please read:http://www.groupstudy.com/list/posting.html
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