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Cisco Bug: CSCtf14732 - "match cos" configure cause egress policing stop working

Last Modified

Mar 27, 2015

Products (12)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco MDS 9124 Multilayer Fabric Switch
  • Cisco MDS 9216i Multilayer Fabric Switch
  • Cisco MDS 9222i Multiservice Modular Switch
  • Cisco MDS 9134 Multilayer Fabric Switch
  • Cisco MDS 9509 Multilayer Director
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco MDS 9506 Multilayer Director
  • Cisco MDS IBM Blade Switch
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Known Affected Releases

4.2(3)

Description (partial)

 Symptom: 
Policing for an interface is not functional even in the presence of a QoS policy applied to that interface with a configuartion for policing.

 Conditions: 
For a class-map that is already part of a service policy applied to an interface, "match cos" is being added as an additional classifier. This is not supported in the hardware and the user's attempt to add "match cos" fails with a warning message. But after this instead of reverting back to configured policing parameters, the packets are not policed and policing is not functional any more for that class.

 Workaround(s): 
Do not use "match cos" as part of a class-map for an outbound policy as this is not supported. If an attempt was made to use this, an error message is displayed indicating that the configuration is not supported. After receiving this error message re-apply the same service policy configuration that is present on interfaces to fix policing functionality.

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