I am in process of troubleshooting a bouncing bgp session.
Scenerio : 2 routers running ebgp, connected via a L2 link. Config vise they are directly connected.
Problem: BGP bounces occassinally. No errors, drops observed on physical interface which is a gigabitethernet. Other side its an ATM interface. Dont have visibility to other router with ATM interface.
%BGP-5-ADJCHANGE: neighbor x.x.x.x Down BGP Notification sent
%BGP-3-NOTIFICATION: sent to neighbor x.x.x.x 4/0 (hold time expired)
%BGP-5-ADJCHANGE: neighbor x.x.x.x Up
1. BGP notification sent, does it mean that this router tearing down the session due to missing keepalives ?
2. What does 4/0 and 0 bytes indicate in 2nd statement of log ?
Any suggestion/idea will be helpful.