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Cisco Bug: CSCup52842 - bgp flapping with fd read error

Last Modified

Oct 29, 2018

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.2(8)S33 6.2(9) 7.1(0)D1(0.169)

Description (partial)

Symptom:
014 Jun 20 18:32:24.386535 bgp: 64896 [9115] (default) EVT: 172.23.96.107 peer connection retry timer expired
 2014 Jun 20 18:32:24.386607 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Triggered active open for peer
 2014 Jun 20 18:32:24.387329 bgp: 64896 [9115] (default) EVT: 172.23.96.107 went from Idle to Active (Active setup)
 2014 Jun 20 18:32:24.388533 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Schedule wait for connect
 2014 Jun 20 18:32:24.388563 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Wait (30 sec) for session setup response
 2014 Jun 20 18:32:24.850982 bgp: 64896 [9115] (default) EVT: 172.23.96.107 connect to peer is successful
 2014 Jun 20 18:32:24.851013 bgp: 64896 [9115] (default) EVT: 172.23.96.107 sending OPEN message to peer
 2014 Jun 20 18:32:24.851060 bgp: 64896 [9115] (default) EVT: 172.23.96.107 went from Active to OpenSent (Active setup)
 2014 Jun 20 18:32:24.851101 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Wait (30 sec) for session setup response
 2014 Jun 20 18:32:24.851498 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Process OPEN message from peer
 2014 Jun 20 18:32:24.851573 bgp: 64896 [9115] (default) EVT: 172.23.96.107 went from OpenSent to OpenConfirm (Active setup)
 2014 Jun 20 18:32:24.851617 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Wait (30 sec) for session setup response
 2014 Jun 20 18:32:24.852853 bgp: 64896 [9115] (default) EVT: 172.23.96.107 went from OpenConfirm to Established (Active setup)
 2014 Jun 20 18:32:24.852898 bgp: 64896 [9115] (default) EVT: 172.23.96.107 cleaning up active peer setup, thread id 0x0
 2014 Jun 20 18:32:24.852991 bgp: 64896 [9115] (default) EVT: 172.23.96.107 went from Idle to Established
 2014 Jun 20 18:32:24.853018 bgp: 64896 [9115] (default) EVT: [IPv4 Unicast] Scheduling peer 172.23.96.107 for soft refresh out
2014 Jun 20 18:32:25.867395 bgp: 64896 [9115] (default) EVT: [IPv4 Unicast] 172.23.96.107 [peer index 245]
2014 Jun 20 18:32:25.879017 bgp: 64896 [9115] (default) EVT: [IPv4 Unicast] Adding peer 172.23.96.107 for update gen
2014 Jun 20 18:32:25.879032 bgp: 64896 [9115] (default) EVT: [IPv4 Unicast] Insert marker dest 0xe1525d64 into xmitlist for 172.23.96.107 with 0 routes on new list and 10475 routes on Tx list
2014 Jun 20 18:32:26.652 bgp: 64896 [9115] (default) EVT: [IPv4 Unicast] Mark AF update completion for peer 172.23.96.107 (sent prefixes: 4670)
2014 Jun 20 18:32:27.054140 bgp: 64896 [9115] (default) EVT: Read error from peer 172.23.96.107: Broken pipe
2014 Jun 20 18:32:27.054221 bgp: 64896 [9115] (default) EVT: Reset by us (fd read error) in session to 172.23.96.107, value 187, state was Established
2014 Jun 20 18:32:27.054242 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Stopping keepalive, hold timers, peer state Established
2014 Jun 20 18:32:27.054261 bgp: 64896 [9115] (default) EVT: peer:172.23.96.107, state: Established, peer GR STATE: none, AF GR state: none, saved flags: 0
2014 Jun 20 18:32:27.054275 bgp: 64896 [9115] (default) EVT: [IPv4 Unicast] 172.23.96.107 Close AF session, gr state none saved flags 0
2014 Jun 20 18:32:27.054290 bgp: 64896 [9115] (default) EVT: [IPv4 Unicast] Requesting cleanup thread to delete/stale routes for peer 172.23.96.107, with index 245
2014 Jun 20 18:32:27.054303 bgp: 64896 [9115] (default) EVT: [IPv4 Unicast] Requesting cleanup thread to delete/stale soft reconfig routes for peer 172.23.96.107, with index 245
2014 Jun 20 18:32:27.054352 bgp: 64896 [9115] (default) EVT: 172.23.96.107 went from Established to Closing
2014 Jun 20 18:32:28.557335 bgp: 64896 [9115] (default) EVT: 172.23.96.107 cleanup thread rcvd route cleanup msg for peer [peer index 245]
2014 Jun 20 18:32:32.066784 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Triggered socket close for peer
2014 Jun 20 18:32:32.066833 bgp: 64896 [9115] (default) EVT: 172.23.96.107 went from Closing to Idle
2014 Jun 20 18:32:37.966472 bgp: 64896 [9115] (default) EVT: 172.23.96.107 peer connection retry timer expired
2014 Jun 20 18:32:37.966599 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Triggered active open for peer
2014 Jun 20 18:32:37.966655 bgp: 64896 [9115] (default) EVT: 172.23.96.107 went from Idle to Active (Active setup)
2014 Jun 20 18:32:37.968283 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Schedule wait for connect
2014 Jun 20 18:32:37.968325 bgp: 64896 [9115] (default) EVT: 172.23.96.107 Wait (30 sec) for session setup response

Conditions:
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