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Date:      Fri, 04 Feb 2011 15:51:42 +0200
From:      Nikos Vassiliadis <nvass@gmx.com>
To:        Damien Fleuriot <ml@my.gd>
Cc:        freebsd-stable@freebsd.org, Pete French <petefrench@ingresso.co.uk>
Subject:   Re: link aggregation - bundling 2 lagg interfaces together
Message-ID:  <4D4C046E.9010107@gmx.com>
In-Reply-To: <4D4BF293.9010604@my.gd>
References:  <E1PlKdH-0000hK-6J@dilbert.ticketswitch.com> <4D4BF293.9010604@my.gd>

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On 2/4/2011 2:35 PM, Damien Fleuriot wrote:
> Even if I can't concatenate my 2 lagg interfaces into a failover one
> over the 2 switches, the new setup will still be an improvement.

Did you consider using STP? Are these switches RSTP capable?

You could create a low priority bridge acting as leaf node in the STP
domain. This will provide redundancy between different ethernet switches,
I just don't know if RSTP converges fast enough for your needs. Just be
a bit careful selecting the bridge's priority. A priority of 61440 will
be probably fine.

I am *almost* sure, that if_bridge works over if_laggs, perhaps you could
combine the two.

HTH, Nikos



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