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Cisco Bug: CSCte21695 - queue depth for LLQ stays 0 at show policy-map under congestion

Last Modified

Aug 11, 2010

Products (1)

  • Cisco 7600 Series Routers

Known Affected Releases

12.2(33)SRD3

Description (partial)

Symptom:

Oversubscribed priority queue's depth is reported as 0 under show policy-map interface. As the packets are dropped in this case and queue is full, the correct value would be configured queue limit for priority queue.

Note in the output that for priority queue we are dropping packets but still the queue depth stays at 0:

ROBIN#show policy-map interface gi 3/0/0
 GigabitEthernet3/0/0 

  Service-policy output: LLQ_depth

  Counters last updated 00:00:00 ago

    queue stats for all priority classes:
      Queueing
      queue limit 25000 packets
      (queue depth/total drops/no-buffer drops) 0/245750/0
      (pkts output/bytes output) 27786750/2778674800

    Class-map: Tralala (match-any)
      17788750 packets, 1778874900 bytes
      30 second offered rate 59773000 bps, drop rate 5924000 bps
      Match: any 
      Priority: Strict, b/w exceed drops: 245750
      

    Class-map: class-default (match-any)
      2232952630 packets, 223295263328 bytes
      30 second offered rate 27337000 bps, drop rate 9445000 bps
      Match: any 
      
      queue limit 2 packets
      (queue depth/total drops/no-buffer drops) 0/12107854/0
      (pkts output/bytes output) 20485422/2048542200
ROBIN#show policy-map interface gi 3/0/0
 GigabitEthernet3/0/0 

  Service-policy output: LLQ_depth

  Counters last updated 00:00:00 ago

    queue stats for all priority classes:
      Queueing
      queue limit 25000 packets
      (queue depth/total drops/no-buffer drops) 0/261340/0
      (pkts output/bytes output) 27868560/2786855800

    Class-map: Tralala (match-any)
      17788750 packets, 1778874900 bytes
      30 second offered rate 59773000 bps, drop rate 5924000 bps
      Match: any 
      Priority: Strict, b/w exceed drops: 261340
      

    Class-map: class-default (match-any)
      2232952630 packets, 223295263328 bytes
      30 second offered rate 27337000 bps, drop rate 9445000 bps
      Match: any 
      
      queue limit 2 packets
      (queue depth/total drops/no-buffer drops) 0/12107854/0
      (pkts output/bytes output) 20485422/2048542200
Conditions:

Overloaded priority queue
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