From: Landon Fitts (l.fitts@xxxxxxxxxxxxxx)
Date: Wed Jul 10 2002 - 15:58:06 GMT-3
Jonathon,
Are you configured for SRB or SRT on the 3920? If configured for
SRB, I believe that you have to configure "multiring IP" on the router
TR interafaces when you have multiple TrCRFs configured under one
TrBRF.
Regards,
Landon
----- Original Message -----
From: "Jonathan V Hays" <jhays@jtan.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, July 10, 2002 2:08 PM
Subject: 3920 TrBRF won't bridge ? HELP!
> Hi Everyone,
>
> I'm having trouble getting a newly created TrBRF on a 3920 to bridge
> traffic between two child TrCRF's - each TrCRF being on a separate port.
> I think I'm missing something.
>
> I'm on a remote rack today and my plan was to spend most of the day on
> the 3920, the ATM, and voice and here I am still stuck on the 3920. I've
> worked with Cisco routers and switches for many years (including two and
> a half years at a Cisco reseller) but I have never seen a 3920.
>
> I *have* read some of Cisco's 3920 docs and I have just now re-read
> Appendix A, "Catalyst 3920 VLAN Tutorial" which walks you through a
> simple TrCRF and TrBRF config.
>
> The details:
>
> I assigned IP addresses to tokenRing 0 on routers R3 and R8 (38.3.3.3/8
> 38.8.8.8/8). BEFORE I configured the switch I was able to ping between
> the routers. I created a new TrBRF (BRF100, VLAN=100, Bridge 0x1) and
> gave it address 38.1.1.1/8. I could also ping this address from the
> routers.
>
> AFTER I put each port in its own virtual ring (TrCRF) and made BRF100
> the parent of each TrCRF I could no longer ping. Why?
>
> My understanding is that the newly created TrBRF (BRF100) is supposed to
> bridge traffic among all its child TrCRFs but it's not doing it. I reset
> NVRAM on the 3920 and tried it again with the same results.
>
> According to the bottom of page A-4 Appendix A of the Catalyst 3920
> Token Ring Switch User Guide (Ver 4.1): "Frames can be switched between
> ports within a single TrCRF. As shown in Figure A-1, multiple TrCRFs can
> be interconnected using a single Token Ring Bridge Relay Function
> (TrBRF)."
>
> As a troubleshooting step, I then created a new TrCRF (CRF10) which also
> has BRF100 as its parent and changed all the ports to be in that new
> TrCRF, instead of each port in its own TrCRF. Once more ping was
> successfull. But this isn't surprising since all ports are in the same
> virtual ring and they don't need the TrBRF anyway. It seems like I am
> missing a step to get the TrBRF to bridge traffic.
>
> [I hadn't planned to spend this much time on the 3920, but I guess I've
> got something to learn here].
>
> What am I missing?
>
> Thanks in advance,
>
> Jonathan
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