[168535] in North American Network Operators' Group
Re: BGP multihoming with two address spaces
daemon@ATHENA.MIT.EDU (Jakob Heitz)
Wed Jan 29 10:35:50 2014
From: Jakob Heitz <jakob.heitz@ericsson.com>
To: "<nanog@nanog.org>" <nanog@nanog.org>
CC: "nanog@nanog.org" <nanog@nanog.org>
Date: Wed, 29 Jan 2014 15:35:29 +0000
In-Reply-To: <mailman.1.1390996800.98572.nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
It is likely that level3 is aggregating your route, but tw can't. Longest m=
atch wins.
--
Jakob Heitz.
> Date: Wed, 29 Jan 2014 03:32:17 -0800
> From: Joseph Jenkins <joe@breathe-underwater.com>
>=20
> I am seeking some feedback/help with my BGP configuration. I am peering =
with two providers level3 and tw. Unfortunately all of my address spaces a=
re preferring the route over tw rather than level3. I have tried Prependin=
g my AS and the carriers AS to the path on the tw side and I see those upda=
te being accepted by internet routers, but everyone is still preferring to =
install the tw routes rather than level3. I was trying to advertise each p=
rovider's address space out their connections and then use the other for ba=
ckup. Now however everything is coming in through tw and no one seems to l=
ike level3.
>=20
>=20
> Thanks in advance for any guidance or assistance.
>=20
> Joe
