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Cisco Bug: CSCuw39946 - MAC learnt on non existent F2e port

Last Modified

Feb 15, 2019

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases


Description (partial)

MAC address learnt on a non existent port

"show sys int l2fm info move_db" will show stale entries.

Seen when a loop occurs and multiple mac flaps were seen. While this happens, if the port-channel is deleted, the process responsible for mac learning still believes the interface exist

When PeerLink is in VPC+ and legs are still in VPC <during migration>, STP mac moves may cause this situation.
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