BGP Advertise-map with dual ISP

Unanswered Question
May 10th, 2008
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I have two upstream on my BGP and I want to make failover when either of them goes down . The attached diagram will explain my scenario and the config I did .


I want to acheive the following this


Advertise my Prefix_A thru ISP_A and Prefix_B thru ISP_B in normal condition

Advertise both Prefixes thru ISP_A when ISP_B is down and vice versa


I did the config. as attached on the diagram . Please tell me if I'nm wrong



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Haris,


To be honest -I think that would be really tricky. What I would do - is just prepend my AS to one of the upstream peers.


That way I can send my AS to both peers, and all my subnets - and just make one peer better than the other.


set as-path prepend 65003 65003 65003


Place the above in with ever route map you want for the secondary peer - and that peer with receve your subnets with an AS cost of 3.


HTH.

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