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Log Reference

S9300, S9300E, and S9300X V200R010C00

This document provides the explanations, causes, and recommended actions of logs on the product.
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MSTP/4/LOOP_GUARD:MSTP process [process-id] Instance[instance-id]'s LOOP-Protection port [port-name] did not receive message in prescriptive time!


The port that was enabled with the loop protection function in the instance did not receive a BPDU within the specified period.


Parameter Name Parameter Meaning
[process-id] indicates the ID of an MSTP instance.
[instance-id] indicates the ID of an instance.
[port-name] indicates the port enabled with the loop protection function.

Possible Causes

The loop protection port did not receive the BPDU within the specified period.


  1. Find out the reason why the BPDU is not received.
Updated: 2019-08-21

Document ID: EDOC1000142069

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