Configuring Loop Guard - Dell S4048T Configuration Manual

to a Loop-Inconsistent state (instead of to a Forwarding state). Loop guard blocks the STP port so that no
traffic is transmitted and no loop is created.
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 131. 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:
Spanning Tree Protocol (STP) 1059