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Cisco Bug: CSCvs34185 - SIT 702 - NCS560 - CPU hogging by LSD process after peer node reload

Last Modified

Sep 02, 2020

Products (1)

  • Cisco Network Convergence System 560 Series Routers

Known Affected Releases

7.0.2.BASE 7.1.1.BASE

Description (partial)

Symptom:
- LSD cpu hog

Conditions:
- High scale, high churn
- LSD-A to LSD-S link has hit flow control many times and retransmission queue is at least of the order of 10^5-10^6
- To verify LSD retransmission queue, see 'NSR Stats' section in 'show mpls lsd private' and refer to the parameter 'Bulk_cnt'
Example
NSR Stats:
   Standby up=1, cnt=1, loc=0/1/CPU0
   Up_ts=Aug 17 15:07:54.145, down_ts=N/A
   Flow_controlled=0, count=0
   Flow_ctrl=N/A, flow_ctrl_clr=N/A
   Standby AIPC reset tmr=Stopped
   HA Sync Mode=GPB
   IDT app_eod=1, ts=Aug 17 15:07:54.164
   IDT completed=1, ts=Aug 17 15:07:54.145
   NSR readiness=0, ts=N/A
   Bulk_cnt=0, pending_fwd_bulk_cnt=0  >>>> This bulk cnt is the size of the retransmission queue
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