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Cisco Bug: CSCvh58940 - LDP flaps due to session keepalive timer expired and End to end traffic drops

Last Modified

Nov 12, 2019

Products (1)

  • Cisco IOS

Known Affected Releases

16.6.3 16.8.1 16.9.1

Description (partial)

Symptom:
LDP may flap continuously due to keepalive timer expiry.

May 22 2018 09:02:17.826: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (2) is DOWN (Session KeepAlive Timer expired)
May 22 2018 09:02:21.978: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (3) is UP
May 22 2018 09:05:21.994: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (3) is DOWN (Session KeepAlive Timer expired)
May 22 2018 09:05:30.731: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (2) is UP
May 22 2018 09:08:30.751: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (2) is DOWN (Session KeepAlive Timer expired)
May 22 2018 09:08:47.127: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (2) is UP
May 22 2018 09:11:47.167: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (2) is DOWN (Session KeepAlive Timer expired)
May 22 2018 09:11:50.462: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (3) is UP
May 22 2018 09:14:50.491: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (3) is DOWN (Session KeepAlive Timer expired)
May 22 2018 09:15:06.525: %LDP-5-NBRCHG: LDP Neighbor A.B.C.D:0 (2) is UP

Conditions:
Switch/Router running 16.6.1, 16.6.2 or 16.6.3 image
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