dual route reflectors

[jamesma01]

when I have dual route reflectors for redundancy purpose, how can I specify one as primary route reflector for all clients?

James

[Akash Agrawal · Accepted solution]

Hi,

If both RRs are advertising same BGP prefix with next-hop information, i guess all BGP attributes will be same other than advertising router-id. You can use the 11th tie breaker in BGP best-path selection criteria. So the RR you want to make primary should have lowest router-id.

11. Prefer the route that comes from the BGP router with the lowest router ID.

http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html

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Regards,

Akash

[jamesma01]

Akash,

Your explanation makes sense to me. SO it seems the only way is to manipulate the router ID.

I would like to specify primary router reflector, because by looking at OSPF topology, I do prefer one RR over the other.

Thanks,

[Akash Agrawal]

While selecting best BGP path, router does consider IGP metric to next-hop but not to advertisign router, because ultimately traffic has to go to next-hop. So IGP cost to RR should not matter here AFAIK.

Regards,

Akash