[rbridge] VLAN Scoping / MAC Uniqueness

[Erik Nordmark]

Radia.Perlman at sun.com wrote:
> I don't agree that we have to explicitly advertise which VLAN a MAC address belongs to, because
> each VLAN runs its own instance of IS-IS in which endnodes are announced. This could be looked
> at as implicitly advertising the VLAN. In other words, the endnode information is announced in
> an instance of IS-IS distinguished by having an inner VLAN tag (I think that's how we differentiate it).
> Core RBridges forward it like a multicast packet for that VLAN. Only border RBridges of that VLAN actually
> store the information.

That is true if you are required to have N IS-IS VLAN instances when 
there are N VLANs in use.

I don't know if that is overkill when all the RBridges are all part of 
all N VLANs - basically when it is just different subsets of 
stations/hosts that make up the different VLANs.

    Erik