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Thread-Topic: ECMP Support
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From: "Li, Qing" <qing.li@bluecoat.com>
To: "Alexandre Biancalana" <biancalana@gmail.com>
Cc: freebsd-net@freebsd.org, Julian Elischer <julian@elischer.org>,
	Qing Li <qingli@freebsd.org>
Subject: RE: ECMP Support
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>=20
>   My idea is use ECMP on 7.x branch to balance 100Mbit=20
> Lan-2-Lan links between our enterprise network and IDC network.
>=20

	I can merge those changes into 7.x. Frankly I have lost
	track of the release schedule so I do need to talk
	to the FreeBSD release team to figure out where and
	when I should integrate the code.

>=20
> In this case the route table only change when a link goes=20
> down, so I will remove this from routing table until this=20
> goes up again. This is a problem with current ECMP implementation ?
>=20

	The route selection uses a hash and because the number of route=20
	entries changes when you remove that route from the routing
table,
	and depending on the hash key, you may get a different route=20
	entry.

	In earlier 5.x releases when "inp_route" is present (route
	is sticky), tcp_output() provides that value and route
	lookup is bypassed.
=09
	This is something we are working on for a fix in -current.

> >
> > The "route" and "netstat" commands work with ECMP.=20
> > There isn't much documentation but I do intend to update the=20
> > manpages soon.
> > Please indicate if there is any other command that you need.
>=20
> I think this is enough for me.
>=20

	Okay.

	-- Qing