[rbridge] Orphaned endnodes with partitioned VLANs on a cloud

[Russ White]

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> Rbridge core
> |         |
> RB1      RB2
> |         |
> +---------+
> 
> This is the case...RB1 and RB2 are connected
> to the core on the top and at the bottom they
> are supposedly edge ports.  However, these 
> accidentally get connected.  What we have is 
> loop and multicast traffic which gets sent
> into the core by both RB1 and RB2.

Two things:

1. There are other ways to resolve this. uRPF would probably would, in
fact. Or, perhaps, sending out hellos marked so they don't form an
adjacency in IS-IS. I should point out that modern bridges don't seem to
have a problem with the bpdu transmissions in this situation, so I don't
see why they would have a problem with IS-IS hellos.

2. We seem to tolerate this misconfiguration problem in modern day
switches all the time, and everyone just seems to live with it.

I would point out that the link here is not intended to transit traffic.
I'm waiting for an example where you'd have 4000 VLANs connected between
two rbridges which are intended to transit traffic.

:-)

Russ

- --
riw at cisco.com CCIE <>< Grace Alone

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