[rbridge] MAC aggregation in rbridge?
Harald Tveit Alvestrand
harald at alvestrand.no
Wed Dec 7 11:44:53 PST 2005
My thought would be that transporting the source and destination MAC
end-to-end is part of the Ethernet model, and we therefore have to respect
it in any viable Rbridge design.
Of course, if you use encapsulation, the rbridges are free to do whatever
they want to do with the MAC of the "envelope" (if there is one).
(note: encapsulating in IPv4 gives you hierarchy for free, and makes the
envelope have 32 bits less space used on address than Mac-in-Mac.... tongue
only slightly in cheek....)
--On onsdag, desember 07, 2005 12:32:35 +0200 Saku Ytti
<saku+rbridge at ytti.fi> wrote:
> I was thinking about the feasibility of supporting MAC address
> aggregation in rbridges. How I think it could work in most simple way is
> that each rbridge has it's own MAC 'prefix' and it then performs MAC
> rewrite on it's 'edge' port, effectively changing the original MAC to
> rbridge prefix+ifindex. Then you'd have aggregated MAC TLV with mask to
> propagate the information.
> In more complex scenario, there could be more hierarchy and aggregation
> depending on topology got from SPF.
> Is this feasible? Is this needed or is it more sane to just grow
> TCAM sizes?
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