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Cisco Bug: CSCuj53593 - ACL filter for QOS classification does not work when CEF is enabled.

Last Modified

Aug 08, 2019

Products (87)

  • Cisco IOS
  • Cisco 888W Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 892W Integrated Services Router
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Known Affected Releases

15.2(4)M 15.2(4)M2 15.2(4)M3.11 15.2(4)M4.5 15.3(3)M1.9 15.4(0.26)T

Description (partial)

Symptom:
When CEF is enabled, ACL filter for QOS classification does not work. The issue can be seen as below:

=====
892#show policy-map int gi0
 GigabitEthernet0

  Service-policy output: pmap-OUT

    Class-map: class-default (match-any)
      210 packets, 36423 bytes
      5 minute offered rate 1000 bps, drop rate 0000 bps
(snip)
      Service-policy : pmap-qos

        queue stats for all priority classes:
          Queueing
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops) 0/0/0
          (pkts output/bytes output) 37/6438

        Class-map: cmap-qos (match-any)
          0 packets, 0 bytes                                    <<===   This counter does not increase even the traffic for the acl is flowing
          5 minute offered rate 0000 bps, drop rate 0000 bps    <<===   
          Match: access-group name acl-qos   
            0 packets, 0 bytes                                  <<===   
            5 minute rate 0 bps                                 <<===   
 
=====

Conditions:
This symptom is not observed under any specific conditions.
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