The Cisco IOS interface-configuration command spanning-tree bpdufilter enable enables BPDU Filter on one switch port. The port stops sending BPDUs and ignores received BPDUs, effectively disabling STP there. section 15.4.3
Use this command with extreme caution:
- It may suit an end-host port where STP is unnecessary and no switching loop can occur. section 15.4.3
- If the port connects to another switch, STP cannot place it into the discarding state, creating a Layer 2 loop risk. section 15.4.3
- Do not confuse it with spanning-tree portfast bpdufilter default: that global feature disables filtering when a PortFast port receives a BPDU. section 15.4.3
Interface configuration
Switch(config-if)# spanning-tree bpdufilter enable This configuration prevents BPDUs from being sent or accepted on the selected interface; verify that the connected device cannot create a switching loop. section 15.4.3
