Thank you Edison. I may be wrong here but from Cisco documentation...

"BGP uses certain timers to control periodic activities such as the sending of keepalive messages, and the interval after not receiving a keepalive message after which the Cisco IOS software declares a peer dead. By default, the keepalive timer is 60 seconds, and the holdtime timer is 180 seconds."

"and the interval after not receiving a keepalive message after which the Cisco IOS software declares a peer dead."

Iam kind of confused with "after not receiving a keepalive message".

Thank you

MS

Under normal conditions, the BGP speaking router will expect to send and receive hello/keepalive packets every 60 seconds.

However, it can miss one or two keepalive messages and the remote peer(s) can still consider the neighbor to be up.

After 3 missed keepalive messages, the peer(s) consider the neighbor to be dead hence the BGP peering is broken.

HTH,

__

Edison.