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Beginner

BGP Neighbor flapping issue

We are having problem with one of our EBGP neighbors. The neighbor flaps daily at a specific time. Followinga the syslog messages received at that particualar time

Mar 27 01:23:40.489 PKT: %BGP-3-NOTIFICATION: received from neighbor X.X.X.X 6/0 (cease) 0 bytes

Mar 27 01:23:40.489 PKT: %BGP-5-ADJCHANGE: neighbor X.X.X.X vpn vrf CUSTOMER Down BGP Notification received

Mar 27 01:23:40.497 PKT: %BGP_SESSION-5-ADJCHANGE: neighbor X.X.X.X IPv4 Unicast vpn vrf CUSTOMER topology base removed from session  BGP Notification received

Mar 27 01:24:38.278 PKT: %BGP-3-NOTIFICATION: sent to neighbor X.X.X.X passive 2/8 (no supported AFI/SAFI) 3 bytes 000101 (timer expired)

Mar 27 01:24:39.510 PKT: %BGP-5-ADJCHANGE: neighbor X.X.X.X vpn vrf CUSTOMER Up

Cannot diagnose as to why the neighbor goes down daily at this time. Accorindg to "sh ip bgp vpnv4 all neighbor X.X.X.X" output                                      "Last reset 08:51:18, due to Active open failed"

Need help on this urgenty. What is the possible cause of this issue. We have multiple neighbors on this router and all others are fine.

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3 REPLIES 3
Beginner

BGP Neighbor flapping issue

Hi Sohaib,

If you cannot find anything unusual in your router try asking for the logs of the neighbor router.

Beginner

BGP Neighbor flapping issue

Contributor

BGP Neighbor flapping issue

Can you put debug ip bgp events

Regards,

Smitesh

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