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Cisco Bug: CSCvt10462 - BgpBackwardTransition was sent when peer device links up

Last Modified

Aug 29, 2020

Products (14)

  • Cisco IOS
  • Cisco 4221 Integrated Services Router
  • Cisco ASR 1000 Series IOS XE SD-WAN
  • Cisco 4321 Integrated Services Router
  • Cisco 4331 Integrated Services Router
  • Cisco ASR 1002-X Router
  • Cisco ASR 1001-X Router
  • Cisco 4351 Integrated Services Router
  • Cisco ISR 4000 Series IOS XE SD-WAN
  • Cisco ISR 1000 Series IOS XE SD-WAN
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Known Affected Releases

16.9.4

Description (partial)

Symptom:
There are three patterns' BGP trap when no shut the router.

1. Bgpestablished was sent.
2. Bgpestablished and bgpBackwardTransition was sent at the same time.
------------
*Jan 13 14:19:33.390: %BGP-5-NBR_RESET: Neighbor x.x.x.x active reset (BGP Notification sent)
*Jan 13 14:19:33.390: %BGP-5-ADJCHANGE: neighbor x.x.x.x Up 
513E.C.17-C3850-24T-(config)#
*Jan 13 14:19:33.394: SNMP: Queuing packet to x.x.x.x
*Jan 13 14:19:33.394: SNMP: V2 Trap, reqid 34, errstat 0, erridx 0 
sysUpTime.0 = 98779 
snmpTrapOID.0 = bgpTraps.1 
bgpPeerEntry.14.x.x.x.x = 04 00  
bgpPeerEntry.2.x.x.x.x = 6
*Jan 13 14:19:33.413: SNMP: Queuing packet to x.x.x.x
*Jan 13 14:19:33.414: SNMP: V2 Trap, reqid 35, errstat 0, erridx 0 
sysUpTime.0 = 98781 
snmpTrapOID.0 = bgpTraps.2 
bgpPeerEntry.14.x.x.x.x = 04 00  
bgpPeerEntry.2.x.x.x.x = 1
------------
3. BgpBackwardTransition was sent and then bgpestablished was sent.
there is time difference  between bgpestablished and bgpBackwardTransition.

------------
*Jan 13 14:21:21.230: SNMP: Queuing packet to x.x.x.x
*Jan 13 14:21:21.230: SNMP: V2 Trap, reqid 38, errstat 0, erridx 0 
sysUpTime.0 = 109562 
snmpTrapOID.0 = bgpTraps.2 
bgpPeerEntry.14.x.x.x.x = 04 00  
bgpPeerEntry.2.x.x.x.x = 1
*Jan 13 14:21:21.480: SNMP: Packet sent via UDP to x.x.x.x
*Jan 13 14:21:33.223: %BGP-5-ADJCHANGE: neighbor x.x.x.x Up 
513E.C.17-C3850-24T-(config)#
*Jan 13 14:21:33.227: SNMP: Queuing packet to x.x.x.x
*Jan 13 14:21:33.227: SNMP: V2 Trap, reqid 39, errstat 0, erridx 0 
sysUpTime.0 = 110762 
snmpTrapOID.0 = bgpTraps.1 
bgpPeerEntry.14.x.x.x.x = 04 00  
bgpPeerEntry.2.x.x.x.x = 6
------------

Conditions:
SNMP configuration:
----------
snmp-server community xxxx RO
snmp-server enable traps snmp linkdown linkup
snmp-server enable traps bgp state-changes limited
snmp-server host x.x.x.x version 2c xxxx 
----------
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