Edge port and automatic edge detection

From an interface, you can configure a device to automatically identify the edge port. The port can become an edge port if no BPDU is received. By default, automatic edge detection is disabled.

Follow these guidelines to configure a port as an edge port:

• When edge port is enabled, the port still participates in a spanning tree.
• A port can become an edge port if no BPDU is received.
• When an edge port receives a BPDU, it becomes a normal spanning tree port and is no longer an edge port.
• Because ports that are directly connected to end stations cannot create bridging loops in the network, edge ports transition directly to the forwarding state and skip the listening and learning states.

Note

If BPDUs are received on a port fast enabled interface, the interface loses the edge port status unless it receives a shutdown or no shutdown command.