BGP Update Source loopback & Next-Hop-Self -- LAB

BGP Update-source Loopback

             Update source Loopback means, when we are forming BGP Neighbor-ship with Loopback IP Address, we need to update the neighbor that we are sending the updates with Loopback as its source, or else it will not form Neighbor-ship.

R1#show
running-config | section router bgp

router bgp 1

 no synchronization

 bgp log-neighbor-changes

 neighbor 2.2.2.2 remote-as 1

 neighbor 2.2.2.2 update-source
Loopback0

 no auto-summary

BGP Next-Hop Self

           When we want to reach the information from other AS , the BGP information will use the Exit path of the AS , as next-hop. If the Next-hop is not reachable, obviously prefix from other AS also will not be reachable. Next-hop self, helps to solve this problem.

R2#show
running-config | section router bgp

router bgp 1

 no synchronization

 bgp log-neighbor-changes

 neighbor 1.1.1.1 remote-as 1

 neighbor 1.1.1.1 update-source Loopback0

 neighbor
1.1.1.1 next-hop-self

 neighbor 192.168.23.3 remote-as 2

 no auto-summary

 Look into the Video Tutorial :