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Over-riding BGP routing

Posted on 2015-01-29
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Last Modified: 2015-02-04
We have two ISPs into our building.  We have two identical Cisco routers, one for ISP A and one for ISP B.  They run BGP between them.  This results in most internet traffic traversing the ISP A circuit.  I have a high-bandwidth application that I'd like to run over ISP B to a particular, small subnet.

How can I override the default BGP routing that would traverse ISP A?  Is it a simple ip route statement pointing to the ISP B router as the gateway to that subnet?  Thank you for your help.
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Question by:sloth10k
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davorin earned 250 total points
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by:mikebernhardt
mikebernhardt earned 250 total points
ID: 40580211
It's easy to get your traffic to go via ISP B using local pref, etc. The part you can't easily control is having their traffic come BACK to you via ISP B, because that is dependent on the other party's routing table. But if that isn't an issue (most of the usage is outbound) then it's easy.

Note about the comment above: Weight is local to each router, not to your AS, so it will not help you in this case. I assume that you are running iBGP between your 2 routers, and if so local pref WILL help you.
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