[rbridge] Max Network size

[Joe Touch]

Greg Daley wrote:
> Hi Joe,
> 
> Joe Touch wrote:
> 
>>Guillermo Ibáñez wrote:
>>
>>
>>>I have a question:
>>>  What is the maximum network size (number of hosts) required/expected 
>>>in TRILL? May be it was already stated somewhere, I am not aware of it.
>>>Regards
>>>Guillermo Ibáñez
>>
>>
>>There is no limit of design; it is based on the capability of edge
>>RBridges to handle encapsulation tables, as well as of interior RBridges
>>to have scalable routing.
>>
>>We expect to scale to numbers of hosts much higher than current bridges,
>> but it's hard to predict what the knee of the design curve will be (IMO).
> 
> 
> If I recall, the only explicit mentions about size (apart from Alex's
> routing cost overview) are that we don't want to scale to metropolis
> (Sydney?) size.
> 
> Greg

I believe there may be limits to the geographic scale, since some
protocols (e.g., MAC, ARP) have timing expectations. There are systems
that have tried to overcome this (L2VPN), but I'm not as familiar with
how well their results work in that regard.

But the question focused on number of hosts, and I believe that
limitation is based on engineering, not architecture.

Joe

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