From owner-freebsd-current@FreeBSD.ORG Sat Apr 17 10:54:54 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 74AAA16A4CE; Sat, 17 Apr 2004 10:54:54 -0700 (PDT) Received: from transport.cksoft.de (transport.cksoft.de [62.111.66.27]) by mx1.FreeBSD.org (Postfix) with ESMTP id B3ACD43D41; Sat, 17 Apr 2004 10:54:53 -0700 (PDT) (envelope-from bzeeb-lists@lists.zabbadoz.net) Received: from transport.cksoft.de (localhost [127.0.0.1]) by transport.cksoft.de (Postfix) with ESMTP id D37AD1FF91D; Sat, 17 Apr 2004 19:54:51 +0200 (CEST) Received: by transport.cksoft.de (Postfix, from userid 66) id D459B1FF90C; Sat, 17 Apr 2004 19:54:49 +0200 (CEST) Received: by mail.int.zabbadoz.net (Postfix, from userid 1060) id 84847155E4; Sat, 17 Apr 2004 17:54:33 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mail.int.zabbadoz.net (Postfix) with ESMTP id 7A087154E5; Sat, 17 Apr 2004 17:54:34 +0000 (UTC) Date: Sat, 17 Apr 2004 17:54:34 +0000 (UTC) From: "Bjoern A. Zeeb" X-X-Sender: bz@e0-0.zab2.int.zabbadoz.net To: Robert Watson In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Virus-Scanned: by AMaViS cksoft-s20020300-20031204bz on transport.cksoft.de cc: FreeBSD current mailing list Subject: Re: RFC: ported NetBSD if_bridge X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Apr 2004 17:54:54 -0000 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/