BGP Next-Hop Processing - Next-Hop-Self

This command changes next hop attribute for received updates to its own IP address.

#neighbor 12.1.1.2 next-hop-self

The neighbor next-hop-unchanged command is used to configured the propagate the next hop unchanged for multihop eBGP peering sessions. This command should not be configured on a route reflector, and the neighbor next-hop-self command should not be used to modify the next hop attribute for a route reflector when this feature is enabled for a route reflector client.

R2(config-router)#do show run | s bgp

router bgp 100

 no synchronization

 bgp log-neighbor-changes

 network 2.2.2.0 mask 255.255.255.0

 neighbor 12.1.1.1 remote-as 100

 neighbor 12.1.1.1 route-reflector-client

 neighbor 12.1.1.1 route-map NEXT-HOP-R1 out

 neighbor 23.1.1.3 remote-as 100

 neighbor 23.1.1.3 route-reflector-client

 neighbor 23.1.1.3 route-map NEXT-HOP-R3 out

 no auto-summary

R2(config-router)#do show run | s route-map

 neighbor 12.1.1.1 route-map NEXT-HOP-R1 out

 neighbor 23.1.1.3 route-map NEXT-HOP-R3 out

route-map NEXT-HOP-R3 permit 10

 set ip next-hop 23.1.1.2

route-map NEXT-HOP-R1 permit 10

 set ip next-hop 12.1.1.2