[rbridge] Max Network size / ARP servers

[Joe Touch]

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Guillermo Ibáñez wrote:
...
>>>>>Some measurements on ARP load are available at:   
>>>>>http://100x100network.org/papers/myers-hotnets2004.pdf
>>>>>       
>> 
>>> Myers extrapolations in the paper are higher ( I do not know his 
>>> rationale) than mine.
>> 
>> There are also other economies of scale possible in an RBridge -
>> broadcasts can be more efficient than in a spanning tree because there
>> can be multiple broadcast trees inside the RBridge campus.
>> 
> Sorry, I do not catch this argument. Multiple spanning trees are not 
> exclusive of Rbridges, any bridge can use them (with MSTP or future 
> simplifications or evolutions of it).

We already note the need to use multiple spanning trees in RBridge to
match the way routing supports multiple paths, as well as for different
VLANs.

I.e., the need for multiple spanning trees is already assumed in
RBridges for other reasons. Agreed, it's not unique to RBridges, but
it's already there at least.

Joe
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