From: Jonathan V Hays (jhays@xxxxxxxx)
Date: Wed Jul 10 2002 - 15:08:14 GMT-3
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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