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Cisco Bug: CSCvu69850 - CPU-PG stuck after port flapping

Last Modified

Oct 08, 2020

Products (65)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 93600CD-GX Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 31108TC-V Switch
  • Cisco Nexus 3548-XL Switch
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Known Affected Releases

9.3(4)

Description (partial)

Symptom:
Port flapping cause the cpu-pg stuck and trigger the port-channel member port-suspend

============
|------------------------------------------------------------------------------------------------------------|
|                                   Output Pool-Group Buffer Utilization (cells/desc)                        |
|                                Drop-PG      No-drop      CPU--PG      LCPU-PG      RCPU-PG      SPAN-PG    |
|------------------------------------------------------------------------------------------------------------|
Total Instant Usage (cells)        76636            0         1361            0            0            0   |

Conditions:
High CPU Inject traffic with Port flap, like N9K as PIM RP and FHR.
F340.08.21-N9K-C9508-3# show hardware internal cpu-mac inband stats | grep rate
Rx packet rate (current/peak)  0 / 0 pps
Tx packet rate (current/peak)  0 / 0 pps
Rx packet rate (current/peak)  609 / 10106 pps    
Tx packet rate (current/peak)  360 / 9991 pps   >>> Peak TX rate is extremely high. Need to met this condition to hit
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