From owner-freebsd-hackers@freebsd.org  Mon Feb 20 20:41:47 2017
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Date: Mon, 20 Feb 2017 23:41:43 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Steven Hartland <killing@multiplay.co.uk>
Cc: Gleb Popov <6yearold@gmail.com>,
 freebsd-hackers <freebsd-hackers@freebsd.org>
Subject: Re: FreeBSD CARP load balancing.
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On Mon, Feb 20, 2017 at 07:16:30PM +0000, Steven Hartland wrote:

> On 20/02/2017 19:07, Gleb Popov wrote:
> >
> > On Mon, Feb 20, 2017 at 12:01 PM, Steven Hartland 
> > <killing@multiplay.co.uk <mailto:killing@multiplay.co.uk>> wrote:
> >
> >     Does LAGG do what you need?
> >
> >
> > Doesn't seem so. I need to balance incoming traffic between several 
> > hosts. If I understood it correctly, lagg can be used to load-balance 
> > outgoing traffic only.
> 
> LAGG does incoming and outgoing but only on a single host, so it does 
> sound like it won't help you.
> 
> That said what your doing does sound quite out of the ordinary, is there 
> a reason you're trying to copy the traffic to multiple hosts?

Just for record: multichassis lacp exist (not for FreeBSD).
http://www.cisco.com/c/en/us/td/docs/ios/cether/configuration/guide/ce_mlacp.html