Date: Wed, 19 Jun 2002 09:41:41 -0700 From: "Kevin Oberman" <oberman@es.net> To: freebsd-mobile@freebsd.org Subject: Re: wireless lans with multiple accesspoints Message-ID: <20020619164141.53C4A5D04@ptavv.es.net> In-Reply-To: Your message of "Wed, 19 Jun 2002 11:18:43 EDT." <20020619151842.GD23903@pir.net>
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> Date: Wed, 19 Jun 2002 11:18:43 -0400 > From: Peter Radcliffe <pir@pir.net> > Sender: owner-freebsd-mobile@FreeBSD.ORG > > Kevin Oberman <oberman@es.net> probably said: > > Simply stated, no. Per 802.3, collisions are a local event. There is > > no way for a switch to "send a collision" and the section of 802.3 on > > full-duplex is specific that collision detection MUST be disabled. A > > switch does not divide a broadcast domain, but does divide a collision > > domain. > > In theory, theory and practice are the same. In practice, they are not. > > Collision detection is not always disabled, collisions do happen if > they are supposed to or not. This is simply not true. If any equipment running full-duplex EVER reports a collision it is BADLY broken. This is cast in stone and central to the full-duplex spec. I have LOTS of switches and hundreds of nodes and have never seen a collision on an interface that was running full-duplex. R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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