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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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