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Cisco Bug: CSCvt01780 - traceback and cpu hog errors after IOS upgrade causing service issues on IPv6

Last Modified

Aug 27, 2020

Products (1)

  • Cisco ASR 901 Series Aggregation Services Routers

Known Affected Releases

15.6(2.4)SP5

Description (partial)

Symptom:
*   From bcm shell, we see active drops by CPU
  *   From Downstream router perspective, downstream device is experiencing pkt drops and in some cases unable to establish session to upstream device
  *   From upstream router, ping with 100 pkts would not be 100%


PERQ_DROP_PKT(0).cpu0   :                     4                  +4
PERQ_DROP_PKT(31).cpu0  :                    19                 +19
PERQ_DROP_PKT(36).cpu0  :               499,754            +499,754              17/s

PERQ_DROP_BYT(0).cpu0   :                 5,920              +5,920
PERQ_DROP_BYT(31).cpu0  :                 6,966              +6,966
PERQ_DROP_BYT(36).cpu0  :            62,124,620         +62,124,620           1,678/s

PERQ_DROP_PKT(36).cpu0  :               500,638                +884              59/s

PERQ_DROP_BYT(36).cpu0  :            62,228,806            +104,186           5,593/s

All affected ASR901s had NOBLOCK/BLOCKHUNG syslog messages.

Conditions:
ASR901
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