BGP routing failover

[chrismorris]

I have two local routers each with a BGP neighbor relationship with a different service provider. Each SP has a neighbor adjacency with a router at one of my remote sites (the same site). When one of the links fails BGP routes across the other SP network to the remote site, however when the link returns the route is not reinstated and I have to clear bgp * in order to force the best route. Anyone any ideas?

[Georg Pauwen]

Hello,

can you post the configurations of both your local routers ?

Regards,

GP

www.solutionfinders.nl

[chrismorris]

Local routers:

router bgp 64523

no synchronization

bgp log-neighbor-changes

network 10.92.0.0 mask 255.255.0.0

aggregate-address 10.92.30.0 255.255.255.0 summary-only

aggregate-address 10.92.31.0 255.255.255.0 summary-only

redistribute eigrp 30

neighbor 81.144.126.16 remote-as 2856

neighbor 81.144.126.16 ebgp-multihop 2

neighbor 81.144.126.16 update-source Loopback0

neighbor 81.144.126.16 distribute-list bgp-out-line1 out

neighbor 81.144.126.146 remote-as 2856

neighbor 81.144.126.146 ebgp-multihop 2

neighbor 81.144.126.146 update-source Loopback0

neighbor 81.144.126.146 distribute-list bgp-out-line2 out

maximum-paths 2

no auto-summary

router bgp 6

no synchronization

bgp log-neighbor-changes

network 10.92.30.0 mask 255.255.252.0

aggregate-address 10.92.30.0 255.255.255.0 summary-only

aggregate-address 10.92.31.0 255.255.255.0 summary-only

redistribute connected

neighbor 206.155.19.85 remote-as 65000

no auto-summary

Remote Routers:

router bgp 64521

no synchronization

bgp log-neighbor-changes

network 10.92.0.0 mask 255.255.0.0

aggregate-address 10.0.0.0 255.0.0.0 summary-only

aggregate-address 139.61.0.0 255.255.0.0 summary-only

aggregate-address 198.160.96.0 255.255.240.0 summary-only

redistribute eigrp 10

neighbor 81.144.126.250 remote-as 2856

neighbor 81.144.126.250 ebgp-multihop 2

neighbor 81.144.126.250 update-source Loopback0

neighbor 81.144.126.250 distribute-list bgp-out-line2 out

neighbor 81.144.126.251 remote-as 2856

neighbor 81.144.126.251 ebgp-multihop 2

neighbor 81.144.126.251 update-source Loopback0

neighbor 81.144.126.251 default-originate

neighbor 81.144.126.251 distribute-list bgp-out-line1 out

maximum-paths 2

no auto-summary

router bgp 5

no synchronization

bgp log-neighbor-changes

network 10.92.0.0 mask 255.255.0.0

aggregate-address 10.0.0.0 255.0.0.0 summary-only

aggregate-address 139.61.0.0 255.255.0.0 summary-only

aggregate-address 198.160.96.0 255.255.240.0 summary-only

redistribute connected

redistribute static

redistribute eigrp 10

neighbor 159.24.207.49 remote-as 65000

neighbor 159.24.207.49 default-originate

neighbor 159.24.207.49 distribute-list bgp-out out

no auto-summary

AS 64521 is the one I have to reset to reinstate the best route