PVST filtering

If you configure a port for PVST filtering instead of PVST protection, the port remains in operation but traps are still generated and the BPDU counter SwitchStpPortErrantBpduCounter is incremented.

Enabling the PVST filter feature allows the port to continuously forward packets without spanning tree intervention, which could result in loop formation. If this occurs, disable the port and then reconfigure it with these commands:
no spanning-tree port-list bpdu-filter
no spanning-tree port-list pvst-filter