From: Jean-Francois Vaillancourt (hans@cam.org)
Date: Mon Jun 30 2003 - 19:44:31 GMT-3
At 2003-06-30, you wrote:
>3550-fa0/2-[vlan2]-e0-R2-s0-WAN-s0-R4-e0-[vlan4]-fa0/4-3550
>
>The ports R1-e0 and R3-e0 and have "bridge-group 1" configured and are
You mean R2 & R4, right? The routers straight on the 3550?
>However, the point is that the 3550 switch is not bridging anything. If
>I had a hosts plugged into vlans 2 and 4 the frames would be forwarded
>to the routers by the 3550, bridged by the routers and forwarded across
>the WAN using DLSW. In fact there are no SNA or NetBIOS frames being
>generated on either vlan. Nonetheless, as soon as I configure
>"bridge-group 1" on the ethernet ports of the routers, the 3550 starts
>acting up by removing those ports from their respective vlans (and later
>reinstating them for a few seconds before removing them again.). This
>will happen even before I configure any dlsw commands.
I had a similar problem, but on a 3524XL. In my case it turned out that the
switch was getting confused by learning the same MACs from 2 vlans. I
didn't try without the DLSW, though.
Are you getting ADDR_FLAP error messages on the 3550, like "relearning zyx
addresses per minute"? If not, it would be interesting to see your STP debugs.
JF
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