eBGP configuration using loopback

[vyasr2010]

Hi ALL,

Facing eBGP issue, Need your support to configure eBGP configuration using loopback.

Kindly refer attached document.

Thanks in advance.

[Georg Pauwen]

Hello,

you need to configure all your neighbors on all routers with 'ebgp-multihop 2', such as on R2 below:

router bgp 200
no synchronization
bgp router-id 11.0.0.1
bgp log-neighbor-changes
network 1.1.1.0 mask 255.255.255.0
network 2.2.2.0 mask 255.255.255.0
network 11.0.0.1 mask 255.255.255.255
neighbor 10.0.0.1 remote-as 100
neighbor 10.0.0.1 update-source Loopback0

neighbor 10.0.0.1 ebgp-multihop 2
neighbor 10.0.0.1 next-hop-self
neighbor 12.0.0.1 remote-as 300
neighbor 12.0.0.1 update-source Loopback0

neighbor 12.0.0.1 ebgp-multihop 2
neighbor 12.0.0.1 next-hop-self
neighbor 13.0.0.1 remote-as 400
neighbor 13.0.0.1 update-source Loopback0

neighbor 13.0.0.1 ebgp-multihop 2
neighbor 13.0.0.1 next-hop-self
no auto-summary

[vyasr2010]

Hi Georg,

Thanks for prompt support.eBGP neighbor ship is established but facing below error.Neighbor ship is getting flapped .

R1#

Mar  1 00:21:53.539: %BGP-5-ADJCHANGE: neighbor 11.0.0.1 Down BGP Notification sent
R1#
*Mar  1 00:21:53.539: %BGP-3-NOTIFICATION: sent to neighbor 11.0.0.1 4/0 (hold time expired) 0 bytes

Also refer attached wireshark file.