From owner-freebsd-net@freebsd.org  Thu Sep 22 18:02:34 2016
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Date: Thu, 22 Sep 2016 21:02:30 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Steven Hartland <killing@multiplay.co.uk>
Cc: Gleb Smirnoff <glebius@FreeBSD.org>, Kubilay Kocak <koobs@freebsd.org>,
 Ryan Stone <rysto32@gmail.com>, Karl Pielorz <kpielorz_lst@tdx.co.uk>,
 freebsd-net <freebsd-net@freebsd.org>
Subject: Re: lagg Interfaces - don't do Gratuitous ARP?
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On Thu, Sep 22, 2016 at 05:50:09PM +0100, Steven Hartland wrote:

> Having tested with a number of vendor switches Cisco, Extreme and more 
> recently Arista only sending gratuitous ARP for IPv4 and unsolicited NA 
> for IPv6 reliably resulted in rapid failover between LAGG ports.
> 
> Other methods like sending correctly addressed output from the new port 
> helped, we tested this with outbound pings from IPMI, but still resulted 
> in noticeable recovery delay.

Can you give network diagram and switchs configs for this?
Recovery delay on lagg interface and lacp protocol must be about 2s by
default configuration.