[119235] in North American Network Operators' Group
BGP Traffic Engineering question
daemon@ATHENA.MIT.EDU (Drew Weaver)
Tue Nov 10 13:32:41 2009
From: Drew Weaver <drew.weaver@thenap.com>
To: "'nanog@nanog.org'" <nanog@nanog.org>
Date: Tue, 10 Nov 2009 13:31:01 -0500
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Howdy,
If you have several transit providers connected to your network and much of=
your traffic is generally directed by the "BGP tiebreaker" (i.e. lowest IP=
address) is there a way, without specifying on a per-prefix basis to prefe=
r the "tie breaker winner" slightly less often? I don't want to "completely=
flip" the preference so that it just saturates a different link, I am just=
trying to see if there is any good way to influence the "natural" selectio=
n method.
We have 6 transit providers, and Level3 always wins because it is 4/8, norm=
ally this isn't a problem because we have traffic engineering systems (rout=
e science/avaya) which move traffic away from that link, but if we need to =
reboot the RS, or something catastrophic happens we would like it to spread=
out a little more evenly.
Anyone have any thoughts on this?=20
-Drew
