[rbridge] Orphaned endnodes with partitioned VLANs on a cloud
anoop at brocade.com
Thu Dec 6 19:08:55 PST 2007
> -----Original Message-----
> From: Russ White [mailto:riw at cisco.com]
> Sent: Thursday, December 06, 2007 10:03 PM
> To: Anoop Ghanwani
> Cc: Radia Perlman; Developing a hybrid router/bridge.
> Subject: Re: [rbridge] Orphaned endnodes with partitioned
> VLANs on a cloud
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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.
Because they don't have to send 4000 BDPUs if they have
4000 VLANs configured on that port.
> 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.
Just the same example above. RB1 & RB2 are edges to the
RBridge core but they are each connected to bridged LANs
configured with 4K VLANs.
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