[AusNOG] Team Cymru BGP flap Q

[Dino Sosic]

Hi,

Would anyone have any ideas why this BGP is flapping two or so times a day?

1303812: May 28 2017 23:56:29 ACST: %BGP-5-NBR_RESET: Neighbor 38.229.66.20 reset (Peer closed the session)
1303813: May 28 2017 23:56:29 ACST: %BGP-5-ADJCHANGE: neighbor 38.229.66.20 vpn vrf internet Down Peer closed the session
1303814: May 28 2017 23:56:29 ACST: %BGP_SESSION-5-ADJCHANGE: neighbor 38.229.66.20 IPv4 Unicast vpn vrf internet topology base removed from session  Peer closed the session
1303815: May 28 2017 23:56:41 ACST: %BGP-5-ADJCHANGE: neighbor 38.229.66.20 vpn vrf internet Up
1303816: May 28 2017 23:58:26 ACST: %BGP-3-NOTIFICATION: received from neighbor 38.229.66.20 4/0 (hold time expired) 0 bytes
1303817: May 28 2017 23:58:26 ACST: %BGP-5-NBR_RESET: Neighbor 38.229.66.20 reset (BGP Notification received)
1303818: May 28 2017 23:58:26 ACST: %BGP-5-ADJCHANGE: neighbor 38.229.66.20 vpn vrf internet Down BGP Notification received
1303819: May 28 2017 23:58:26 ACST: %BGP_SESSION-5-ADJCHANGE: neighbor 38.229.66.20 IPv4 Unicast vpn vrf internet topology base removed from session  BGP Notification received
1303820: May 28 2017 23:58:39 ACST: %BGP-5-ADJCHANGE: neighbor 38.229.66.20 vpn vrf internet Up


Nothing fancy in the config, just usual template peer-session and peer-policy. Anyone else having this issue? Platform is ASR1k running 03.14.01.S (15.5.1 S1). Latency to the peer is around 300 ms in average, due to it being in US. I did try different timers but it didn't resolve the issue, just slowed it down.

Cheers,

Dino

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