BGP Traffic Engineering question

Drew Weaver drew.weaver at thenap.com
Tue Nov 10 12:31:01 CST 2009


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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