Date: Sat, 17 Apr 2004 17:54:34 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Robert Watson <rwatson@freebsd.org> Cc: FreeBSD current mailing list <current@freebsd.org> Subject: Re: RFC: ported NetBSD if_bridge Message-ID: <Pine.BSF.4.53.0404171744160.9278@e0-0.zab2.int.zabbadoz.net> In-Reply-To: <Pine.NEB.3.96L.1040417132536.8431D-100000@fledge.watson.org> References: <Pine.NEB.3.96L.1040417132536.8431D-100000@fledge.watson.org>
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On Sat, 17 Apr 2004, Robert Watson wrote: > > On Sat, 17 Apr 2004, Robert Watson wrote: > > > On 17 Apr 2004, Lowell Gilbert wrote: > > > > > They're referring to IEEE 802.1d. This is an important feature for > > > building large bridged networks. > > > > And it's an important part of many ethernet-layer redundancy solutions, > > since it allows fail-over when one bridging element or graph edge goes > > offline. It's something we really missed in some research work I was > > working on to build link layer filters, since it was an easy way to > > provide basic fail-over in the presence of ethernet link failures (and > > they happen a lot!) > > Just as a followup for those not familiar with spanning tree in the > context of ethernet, here's a URL in one of Cisco's product manuals: > > http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/config/spantree.htm > > It talks a bit about how the spanning tree algorithm applies to ethernet, > and applications of spanning tree. here are the other resources that come to my mind for those how like standards: http://www.ieee802.org/1/pages/802.1s.html http://www.ieee802.org/1/pages/802.1w.html and 'the thread' I remember about spanning tree is this one ;-) (and perhaps related threads; don't remember): "Spanning tree melt down ?" starting at http://www.merit.edu/mail.archives/nanog/2002-11/msg00655.html -- Greetings Bjoern A. Zeeb bzeeb at Zabbadoz dot NeT 56 69 73 69 74 http://www.zabbadoz.net/
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