nanog mailing list archives

Re: switch speed question


From: David Barak <thegameiam () yahoo com>
Date: Wed, 25 Feb 2009 05:48:04 -0800 (PST)


Doesn&#39;t that assume that the communicarion is unidirectional?

If two hosts are exchanging 1Gbps flows, the traffic across the bus will be 2Gbps, right?

And of course, this doesn&#39;t include any bus-intensive operations like multicast
or things which require cpu processing - those can consume a lot more resources than the input rate of the port.

-David Barak

Tom Storey wrote: 
Not every bit in results in just one bit out.  Broadcast, multicast,
flooding for unknown MACs (or switching failures), ...
They were talking about a simple scenario where a bit that enters a port
will leave a port. With 24 gigabit ports, for all intents and purposes,
you will only ever have 24 gigabits at the most traversing the backplane.



      


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