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Cisco Bug: CSCuq83571 - QoS post policy packet drops with zero input traffic on class

Last Modified

Nov 27, 2020

Products (149)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco VG224 Analog Voice Gateway
  • Cisco 861W Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 1812 Integrated Services Router
  • Cisco 1803 Integrated Services Router
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Known Affected Releases

15.1(4)M8 15.2(4)M6 15.4(3)M

Description (partial)

SNMP polled values for QoS statistics shows no traffic matched for class-default (child policy) and classified under this class, but we have huge post policy traffic counter.

CISCO-CLASS-BASED-QOS-MIB::cbQosCMPrePolicyByte64.98.9552865 ( 0
CISCO-CLASS-BASED-QOS-MIB::cbQosCMPostPolicyByte64.98.9552865 ( 18446744073707197102

In the show policy-map int we are able to see:
Class-map: class-default (match-any)
         0 packets, 0 bytes <<<<< none matched
          30 second offered rate 0 bps, drop rate 0 bps
          Match: any

          queue limit 64 packets
          (queue depth/total drops/no-buffer drops) 0/1609/1609 <<<< drops on the class
          (pkts output/bytes output) 112832349/165118845245 <<<< some traffic is being matched

Situation is due to ip flow export configuration present:

ip flow-export source GigabitEthernet0/1
ip flow-export version 9 origin-as
ip flow-export destination 9999

1)ISR G1 e.g. 3925
IOS: c3900-universalk9-mz.SPA.154-3.M.bin
IOS: c3900-universalk9-mz.SPA.152-4.M6a.bin

2) ISR G1 e.g. 3825
IOS: c3900-universalk9-mz.SPA.151-4.M8.bin
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