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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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VBST/4/LOOPDETECT

VBST/4/LOOPDETECT

Message

VBST/4/LOOPDETECT: In VBST VLAN [ULONG], the port [STRING] was blocked because it received the VBST packets sent by itself.

Description

When the port detected loopback, block the port.

Parameters

Parameter Name Parameter Meaning
[ULONG] VLAN ID.
[STRING] Indicates the port name.

Possible Causes

The VBST port of the equipment detected a loopback.

Procedure

  1. Check whether a local loopback is configured on the interface where the log is generated.

    • If a local loopback is configured on the interface where the log is generated, go to Step 3.
    • If no local loopback is configured on the interface where the log is generated, go to Step 2.

  2. Check whether a loop is formed by a hub and devices, one of which is connected to the interface.

    • If a loop is formed by a hub and devices, one of which is connected to the interface, go to Step 4.
    • If no loop is formed by a hub and devices, one of which is connected to the interface, go to Step 5.

  3. Run the undo loopback command to delete the local loopback configuration, and check whether the log persists. If the log persists, go to Step 5.
  4. Remove the self-loop network cable from the hub and check whether the log persists. If the log persists, go to Step 5.
  5. Collect trap, log, and configuration information, and contact technical support personnel.
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Updated: 2019-08-21

Document ID: EDOC1000142069

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