stp bpdu-filter (Ethernet interface view)

Usage Scenario

On a network running STP, if a port is configured as an edge port using the stp edged-port enable command, the port will not participate in the spanning tree calculation. This speeds up network convergence and improves network stability. However, this port may send BPDUs to other networks, causing network flapping.

To prevent this problem, run the stp bpdu-filter enable command on the edge port. The port becomes a BPDU-filter port and will not process BPDUs.

Running the stp bpdu-filter enable command in the interface view configures only the current port as a BPDU-filter port. If multiple BPDU-filter ports are required on a device, run the stp bpdu-filter default command in the system view to configure all the ports as BPDU-filter ports, and then run the stp bpdu-filter disable command in the view of the interfaces that need to participate in spanning tree calculation. If a port has been configured as a non-BPDU filter port using the stp bpdu-filter disable command, it remains a non-BPDU filter port, even if the stp bpdu-filter default command is run.

Precautions

After the stp bpdu-filter disable command is run on a port, the port becomes a non-BPDU-filter port. The port remains a non-BPDU-filter port even if the stp bpdu-filter default enable command is run in the system view. After the undo stp bpdu-filter command is run on the port, the port restores to the default setting.

A BPDU-filter port cannot process and send BPDUs. Consequently, it cannot negotiate the STP status with the directly connected port on the remote device. Therefore, exercise caution when using the stp bpdu-filter enable command. Running the stp bpdu-filter enable command only on edge ports is recommended.