On Tue, May 22, 2012 at 12:24 PM, Cyn D. <cynthia_...@yahoo.ca> wrote: > Network connections: > > We have router A(M120, 10.4), B(MX240, 11.4) and C(M7i, 10.4) connected as a > triangle. Router A and B are in OSPF area 0 and also run IBGP between them. > Router C is connected to A and B via OSPF area 5. > > Problem: > > Router A has a lot of EBGP learned routes. These routes are redistributed to > router B using IBGP and OSPF. My intension is to redistribute these routes to > Router C with OSPF from BOTH A and B. Therefore if A-C link fail, Router C > will learn all routes from B. The problem is now Router C only learned these > routes from A but can not learn from router B. Did I miss anything or is it > Router B not working properly?
Assuming that B and C are both in the same AS and speaking iBGP, B wont re-announce the NLRIs back into itself without being set as a route reflector. However, I'd recommend making a full-mesh of BGP sessions over OSPF-learned loopback addresses. Whether that's hauled over MPLS or some other L2 transport mechanism, or using routing and multi-hop BGP is up to you. That way, C will still learn the routes coming into A, even if the path is via B to get to the next-hops. Cheers, jof _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
