BGP Traffic Engineering question

Drew Weaver drew.weaver at
Tue Nov 10 18:36:17 UTC 2009

Sure, it still works however (for now).


-----Original Message-----
From: jeffrey.lyon at [mailto:jeffrey.lyon at] On Behalf Of Jeffrey Lyon
Sent: Tuesday, November 10, 2009 1:34 PM
To: Drew Weaver
Cc: nanog at
Subject: Re: BGP Traffic Engineering question

Isn't Route Science EOL?


On Tue, Nov 10, 2009 at 1:31 PM, Drew Weaver <drew.weaver at> wrote:
> 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 prefer 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" selection method.
> We have 6 transit providers, and Level3 always wins because it is 4/8, normally this isn't a problem because we have traffic engineering systems (route 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?
> -Drew

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