Flapping Peer
Enable “bgp log-neighbor-changes” so you geta log message when a peer flaps
R1 and R2 are peering over ATM cloud
%BGP-5-ADJCHANGE: neighbor 1.1.1.1 Down BGP Notification sent
%BGP-3-NOTIFICATION: sent to neighbor 1.1.1.1 4/0 (hold time expired) 0 bytes
R2#show ip bgp neighbor 1.1.1.1 | include Last reset
Last reset 00:01:02, due to BGP Notification sent, hold time expired
- We are not receiving keepalives from the other side!