From owner-freebsd-mobile  Wed Jun 19  7:56:21 2002
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Date: Wed, 19 Jun 2002 10:56:17 -0400
From: Peter Radcliffe <pir@pir.net>
To: freebsd-mobile@FreeBSD.ORG
Subject: Re: wireless lans with multiple accesspoints
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References: <20020619084119.C27055@gilberto.physik.rwth-aachen.de> <20020619140053.B1FA35D04@ptavv.es.net>
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Kevin Oberman <oberman@es.net> probably said:
> The use of that term goes way back and it really is no longer
> appropriate in the era of full-duplex where collision simply don't
> exist. But it matters here.

It is still appropriate in the era of full-duplex, and collisions do
exist even with full-duplex switches.

Switches are still the same broadcast domain, you can still get
collisions for any packet that is not unicast or is broadcast to all
ports by the switch for another reason. If the per port buffering
is small or there is just too much traffic ... it's much, much
less likely to happen, but can still happen.

Some switches produce collisions to signal the kit on that port to
back off if the egress port is highly congested, for example.

P.

-- 
pir                pir-sig@pir.net                 pir-sig@net.tufts.edu


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