Which statement is true about loop guard?

Which statement is true about loop guard?

A. Loop guard only operates on interfaces that are considered point-to-point by the spanning tree.
B. Loop guard only operates on root ports.
C. Loop guard only operates on designated ports.
D. Loop guard only operates on edge ports.

 

Loop guard prevents the loop in L2 point-to- point topology.

Loop guard in spanning tree topology checks if the root port or alternate port is receiving BPDUs.

In the spanning tree situation, the blocking port will be forwarding state, when the blocking port stop receiving BPDUs, may cause a loop.

With loop guard, STP checks if blocking port is receiving BPDUs. If not, it does not make the blocking forwarding but “Loop Inconsistent mode”.

The port in Loop Inconsistent will not be act like normal STP port until they start receiving BPDUs. It means the bridges will avoid the bridging loops.

Pocket

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