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List:       ipfilter
Subject:    Re: Transparent Bridge with 3 nics.
From:       Vladimir Jirasek <vladimir.jirasek () centrum ! cz>
Date:       2001-09-26 9:15:57
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When you are thinking of STP on OpenBSD you probably have two OpenBSD machines
connected to one or more switches on each side. In this case switches have to
support STP or nothing will work.
And be carefull, I have tested STP on cisco switches and for example on 2948
there are no problems but on 4003 I had to set up same STP parameters also on
openbsd (Openbsd has more wide range for timeouts than Cisco).

Vladimir Jirasek

On Sat, 22 Sep 2001, Ryan Williams wrote:

> Date: Sat, 22 Sep 2001 22:26:12 -0400
> From: Ryan Williams <rgw@im1.net>
> To: ipfilter@coombs.anu.edu.au
> Subject: Re: Transparent Bridge with 3 nics.
> Resent-Date: Mon, 24 Sep 2001 12:32:24 +0200
> Resent-From: <vladimir.jirasek@centrum.cz>
>
> I was just reading through some archives to figure out my latest network
> problem and I came accross this post to the mailing list. I was wondering if
> instead of using openbsd with the spanning tree protocol, if I coud use the
> spanning tree protocol on the switches. I have never used the spanning tree
> protocol before. Is it something that us usually automagic on switches and
> in openbsd? More information about an actual setup would be nice.
>
> Regards,
>
> Ryan Williams
>
> ----- Original Message -----
> From: "Jim Sandoz" <sandoz@lucent.com>
> To: "Maikel Verheijen" <maikel@myst.dyn.dohd.org>
> Cc: <ipfilter@coombs.anu.edu.au>
> Sent: Wednesday, July 25, 2001 10:58 PM
> Subject: Re: Transparent Bridge with 3 nics.
>
>
> > maikel,
> >
> > you will need to use an OS and version that supports the spanning-tree
> > bridge protocol-- else you are facing and will continue to face the
> > classical looped ethernet network problem.
> >
> > according to
> > http://www.openbsd.org/29.html
> > openbsd 2.9 now supports spanning tree, see
> > http://www.openbsd.org/cgi-bin/man.cgi?query=bridge&sektion=4
> >
> > for more info on spanning tree itself, see for example
> > http://www.cisco.com/warp/public/473/5.html
> > http://www.cisco.com/warp/public/473/16.html
> >
> > and the product/catos/ios-specific info at
> >
> http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/config/s
> pantree.htm
> >
> >
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/ibm_c
> /bcprt1/bctb.htm
> >
> > you may be interested in the mechanics of cisco's "portfast" function.
> >
> > the foundation of spanning tree is found in IEEE 802.1D-1998.
> >
> > n.b.
> > be sure that your ipf rules on the bridge can pass the BPDU's.
> >
> > jim
> >
> > ps
> > the "other" question is-- why does the first bridge break? and if
> > you want you can save time booting the second machine by just
> > unplugging the CAT5 cables at the network interfaces... :*)
> >
> > pps
> > according to
> > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/bridging.html
> > http://www.FreeBSD.org/cgi/man.cgi?query=bridge&sektion=4
> > freebsd does not have native support for spanning tree.
> > there may be some patches or packages which do so.
> > the default on freebsd is that the interface is muted upon
> > detection of a loop.  see
> >
> http://www.FreeBSD.org/cgi/man.cgi?query=ng_bridge&sektion=4&apropos=0&manpa
> th=FreeBSD+4.3-RELEASE
> >
> >
> >
> >
> >
> >
> >
> > Maikel Verheijen wrote:
> >
> > > Hi all,
> > >
> > > Regarding to this question, I have another one concerning a bridge:
> > >
> > > I want to create a fail-over situation by using two identical filtering
> > > (openbsd) bridges like this:
> > >
> > > +---------------------------------------------------------------------+
> > > |                  Internet (Attached through cisco catalyst, vlan 1) |
> > > +---------------------------------------------------------------------+
> > >              |                                           |
> > >         +---------+    B-1: Bridge 1                +---------+
> > >         |   B-1   |    B-2: Bridge 2                |   B-2   |
> > >         +---------+                                 +---------+
> > >              |                                           |
> > > +---------------------------------------------------------------------+
> > > |                  LAN (Attached to Cisco catalyst, vlan 2)           |
> > > +---------------------------------------------------------------------+
> > >
> > > However, this situation gives me a headache, because whenever both
> bridges
> > > are enabled, the complete network gets cluttered by a broadcast storm. I
> am
> > > not familiar enough with openbsd and bridging to sort this out, so I
> hope
> > > someone on the list can help me out here.... I would REALLY like to get
> > > this thing up and running smoothly,  booting the second machine whenever
> > > the first machine breaks takes too long :(
> > >
> > > Thanks in advance,
> > >
> > > Maikel Verheijen.
> >
> >
>

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