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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/LOOPBACK_DETECTED:The port [port-name] was blocked because it received the BPDU packets sent by itself.


STP detected a self loop when an interface received the BPDUs sent by itself.


Parameter Name Parameter Meaning
port-name Name of the port where loopback detection is enabled

Possible Causes

An STP-capable interface received BPDUs with the designated bridge ID as the local bridge ID and the designated interface ID as the local interface ID, indicating that a self loop occurs.


  1. Run the display current-configuration interface interface-name command to check whether the interface generating this alarm has been configured with the loopback function.

    • If so, go to Step 4.
    • If not, go to Step 2.

  2. Check whether there is a loop formed by hubs and devices that are connected to the interface.

    • If so, go to Step 5.
    • If not, go to Step 3.

  3. Collect log information and configuration information, and then contact technical support personnel.
  4. Run the undo loopback command in the interface view to delete the local loopback configuration.
  5. Remove the self-loop network cable from the hub to resolve the problem.
Updated: 2019-08-21

Document ID: EDOC1000142069

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