STP - BPDUs on a switch where STP is disabled

When STP is disabled on a particular VLAN, any BPDUs received are forwarded like other multicast frames. No BPDUs are generated by the switch interfaces on that particular VLAN.

Links:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/15-2_2_e/command/reference/CR_3750X/cli3.html#pgfId-1947142