10-07-2014 12:41 PM
when I have dual route reflectors for redundancy purpose, how can I specify one as primary route reflector for all clients?
James
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10-08-2014 03:20 AM
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
--Pls dont forget to rate helpful posts--
Regards,
Akash
10-08-2014 03:20 AM
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
--Pls dont forget to rate helpful posts--
Regards,
Akash
10-08-2014 07:17 AM
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,
10-09-2014 06:40 AM
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
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