Configuring Loop Guard - Dell C9000 Series Networking Configuration Manual

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As soon as a BPDU is received on an STP port in a Loop-Inconsistent state, the port returns to a blocking

state. If you disable STP loop guard on a port in a Loop-Inconsistent state, the port transitions to an STP

blocking state and restarts the max-age timer.

Figure 134. STP Loop Guard Prevents Forwarding Loops

Configuring Loop Guard

Enable STP loop guard on a per-port or per-port channel basis.

The following conditions apply to a port enabled with loop guard:

Loop guard is supported on any STP-enabled port or port-channel interface.

Loop guard is supported on a port or port-channel in any spanning tree mode:

Spanning Tree Protocol (STP)