On Wed, 2011-08-03 at 11:51 -0430, Juan C. Crespo R. wrote:
> This switch will be used by one ISP, with a medium load (close to 20k 
> customers)

Still not enough information. :-) Try asking yourself this:

 - Total forwarding capacity, all ports (800 Mbps x 2 (in/out)?)

 - QoS requirements? (Classification (CoS, DSCP?), scheduling (priority
   queueing?), marking)

 - STP? PVST+? Rapid-PVST+? MST?

 - MAC address table size? Would it just forward between a number of
   routers, or also forward customer traffic? Should it be able to hold
   20k unique MAC addresses?

 - Just L2 switching?

There's probably many times more questions that would be relevant, but
it's hard reading minds at a distance. ;-)

-- 
Peter


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