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Sender: Bernhard Schmidt <bschmidt@techwires.net>
From: Bernhard Schmidt <bschmidt@freebsd.org>
To: Damien Fleuriot <ml@my.gd>
Date: Fri, 4 Feb 2011 13:42:03 +0100
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Cc: freebsd-stable@freebsd.org
Subject: Re: link aggregation - bundling 2 lagg interfaces together
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On Friday 04 February 2011 13:13:52 Damien Fleuriot wrote:
> Hello list,
> 
> 
> 
> I have a firewall with 2x Intel pro dual port cards.
> 
> On Intel A , port 1 goes to switch 1, port 2 goes to switch 2
> On Intel B , port 1 goes to switch 1, port 2 goes to switch 2
> 
> 
> I have created the following 2 lagg devices using LACP:
> 
> lagg0 = A1 + B1
> lagg1 = A2 + B2
> 
> This works fine.
> 
> 
> Now, what I had in mind was creating a lagg2 device using lagg0 and
> lagg1 with failover.
> 
> That would provide redundancy in case of a switch failure.
> 
> ifconfig won't let me though:
> 
> # ifconfig lagg2 laggproto failover laggport lagg0 laggport lagg1
> ifconfig: SIOCSLAGGPORT: Invalid argument
> 
> 
> 
> I suppose it's not possible to aggregate lagg interfaces ?
> 
> That would shatter my dreams :(

I have no clue if that is at all possible, or makes any sense at all, 
but can't you just add all 4 ports one lagg interface?

-- 
Bernhard