redgoblin wrote: Hey guys, I've got a quick BGP question. Basically I'm using BGP as a failover solution on Primary and Secondary routers so that if the primary goes down, BGP will kick in and route LAN subnets down the secondary. When I test this (by shutting down the primary) the BGP kicks in and routes down the secondary as intended. Problem is, when I unshut the secondary, the BGP doesn't kick back to the primary until I do a 'Soft Reconfig' to clear the session which then rightfully recognises the primary as having the weightier route and starts routing down it. My question is, instead of having to do a manual 'soft-reconfig' command, is there some sort of dynamic command that can be used to automatically refresh a BGP session when it goes down?
tmlerdal wrote: I've got this sort of scenario setup in my network. What we've done is prepend the as path to the secondary path. Sadly I don't know BGP well enough right now to explain the specifics on how we did it, but here is a snippet of the config: router bgp 1031 no synchronization bgp always-compare-med bgp log-neighbor-changes bgp redistribute-internal network 10.31.0.0 mask 255.255.0.0 timers bgp 3 9 neighbor 10.31.254.252 remote-as 1031 neighbor 10.31.254.252 description Router1 neighbor 10.31.254.252 ebgp-multihop 2 neighbor 10.31.254.252 update-source Loopback0 neighbor 10.31.254.252 next-hop-self neighbor 10.31.254.252 password 7 xxxxxxxxx neighbor 10.32.254.253 remote-as 1032 neighbor 10.32.254.253 description Router2 neighbor 10.32.254.253 ebgp-multihop 2 neighbor 10.32.254.253 update-source Loopback0 neighbor 10.32.254.253 route-map AddR1toR2AS out neighbor 10.32.254.253 password 7 xxxxxxxxx maximum-paths 4 route-map AddR1toR2AS permit 10 set as-path prepend 1031 route-map AddASnumbers permit 10 set as-path prepend 1031 1031
