From owner-freebsd-stable@FreeBSD.ORG  Tue Aug 12 10:55:56 2008
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 99653106564A
	for <stable@freebsd.org>; Tue, 12 Aug 2008 10:55:56 +0000 (UTC)
	(envelope-from eugen@kuzbass.ru)
Received: from www.svzserv.kemerovo.su (www.svzserv.kemerovo.su
	[213.184.65.80])
	by mx1.freebsd.org (Postfix) with ESMTP id EFE558FC13
	for <stable@freebsd.org>; Tue, 12 Aug 2008 10:55:55 +0000 (UTC)
	(envelope-from eugen@kuzbass.ru)
Received: from www.svzserv.kemerovo.su (eugen@localhost [127.0.0.1])
	by www.svzserv.kemerovo.su (8.13.8/8.13.8) with ESMTP id m7CAtqn5090007;
	Tue, 12 Aug 2008 18:55:52 +0800 (KRAST)
	(envelope-from eugen@www.svzserv.kemerovo.su)
Received: (from eugen@localhost)
	by www.svzserv.kemerovo.su (8.13.8/8.13.8/Submit) id m7CAtqJJ090006;
	Tue, 12 Aug 2008 18:55:52 +0800 (KRAST) (envelope-from eugen)
Date: Tue, 12 Aug 2008 18:55:52 +0800
From: Eugene Grosbein <eugen@kuzbass.ru>
To: Marian Hettwer <mh@kernel32.de>
Message-ID: <20080812105552.GA89695@svzserv.kemerovo.su>
References: <a588673badeccac53d23f7964c216f62@localhost>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <a588673badeccac53d23f7964c216f62@localhost>
User-Agent: Mutt/1.4.2.3i
Cc: stable@freebsd.org
Subject: Re: lagg(4) and failover
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 12 Aug 2008 10:55:56 -0000

On Tue, Aug 12, 2008 at 12:37:15PM +0200, Marian Hettwer wrote:

> I'm using lagg(4) on some of our servers and I'm just wondering how the
> failover is implemented.
> The manpage isn't quite clear:
> 
>      failover     Sends and receives traffic only through the master port. 
> If
>                   the master port becomes unavailable, the next active port
> is
>                   used.  The first interface added is the master port; any
>                   interfaces added after that are used as failover devices.
> 
> What is meant by "becomes unavailable"? Is it just the physical link which
> needs to become unavailable to trigger a failover?

Yes. It seems you need lacp protocol described later in the manual.

Eugene Grosbein