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Cisco Bug: CSCvu68040 - C4500 No STP PVID inconsistent state when there is native vlan mismatch

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases


Description (partial)

- When there is native vlan mismatch on C4500 and affected port has native VLAN of 1, C4500 does not set involved VLANs to PVID inconsistent state. 
- This may cause a switching loop if affected interface should be blocking in STP. Affected interface will go to designated forwarding status.
- VLAN that is supposed to be native will not increment RX BPDU's on "show spanning-tree detail" output for affected interface.

- First seen on C4500 Sup7-E and Sup8-E
- Native VLAN mismatch
- Affected port has native VLAN of 1
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