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Cisco Bug: CSCuw55425 - EPG sclass incorrect when previously static on L3Out

Last Modified

May 16, 2019

Products (11)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 9508 Switch
  • Cisco Nexus 9332PQ Switch
  • Cisco Nexus 93128TX Switch
  • Cisco Nexus 9372TX Switch
  • Cisco Nexus 9336PQ ACI Spine Switch
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Known Affected Releases


Description (partial)

Traffic destined to an endpoint is incorrectly classified with an external EPG sclass.  As a result, the traffic does not match the expected filters and may be policy dropped.

If an endpoint is learned in a subnet that has a matching /32 external prefix configured in an external EPG, then the pctag (sclass) used for policy enforcement will be reassigned to the external EPG.  If the external prefix is then deleted, and the fabric host is active, hardware will continue to assign the fabric host the sclass of the external EPG.  
This is a misconfiguration.  /32 prefixes on external L3out's should not overlap with other subnets in the same VRF within the fabric.
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