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Date: Wed, 18 Jun 2008 15:04:22 -0700
From: Andrew Thompson <thompsa@FreeBSD.org>
To: Alexandre Biancalana <biancalana@gmail.com>
Message-ID: <20080618220422.GB76058@citylink.fud.org.nz>
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Cc: freebsd-net@freebsd.org
Subject: Re: Use lagg(4) multiple switches
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On Wed, Jun 18, 2008 at 04:20:48PM -0300, Alexandre Biancalana wrote:
> Hi list,
> 
>  We have one machine with 3 nics configured with lagg(4). Each nic is
> connected to a different switch, but only one is in active mode.
> 
> $ ifconfig -v lagg0
> lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
>         ether 00:15:17:6f:f1:9e
>         media: Ethernet autoselect
>         status: active
>         groups: lagg
>         laggproto lacp
>         lag id: [(8000,00-15-17-6F-F1-9E,00F0,0000,0000),
>                  (0001,00-1E-C9-86-9D-6F,0272,0000,0000)]
>         laggport: local3 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING> state=3D
>                 [(8000,00-15-17-6F-F1-9E,00F0,8000,0001),
>                  (0001,00-1E-C9-86-9D-6F,0272,0001,0001)]
>         laggport: local2 flags=18<COLLECTING,DISTRIBUTING> state=3D
>                 [(8000,00-15-17-6F-F1-9E,00F0,8000,0003),
>                  (0001,00-1E-C9-86-9D-60,0272,0001,0001)]
>         laggport: local1 flags=18<COLLECTING,DISTRIBUTING> state=3D
>                 [(8000,00-15-17-6F-F1-9E,00F0,8000,0002),
>                  (0001,00-1E-4F-08-ED-3A,0272,0001,0001)]
> 
> Is possible make all the nics work together ??

LACP can only work with one switch at a time. It will pick the path with
the best priority/speed and will failover to a better path, but only one
switch at a time.


Andrew