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Support Documentation

Log Reference

CloudEngine 8800, 7800, 6800, and 5800 V200R005C00

This document provides the explanations, causes, and recommended actions of logs on the product.

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MSTP/4/TC_GUARDED

MSTP/4/TC_GUARDED

Message

MSTP/4/TC_GUARDED:With the TC protection enabled, if TC BPDUs were received after the number of TC BPDUs received by an instance exceeded the threshold, these TC BPDUs were processed after the TC protection time expires. (InstanceID=[InstanceID],bridgePriority=[bridgePriority])

Description

If the number of TC BPDUs received by the MSTP process instance exceeds the threshold, any new TC BPDU will be processed after the TC protection time expires.

Parameters

Parameter Name Parameter Meaning
InstanceID Indicates the ID of an MSTP process.
bridgePriority Indicates the bridge priority.

Possible Causes

The number of TC messages received by an MSTP process in a specified period exceeded the threshold.

Procedure

  • The number of TC messages received by an MSTP process in a specified period exceeded the threshold.
    1. Check whether the network topology flapping occurs.

      • If the network topology flapping occurs, go to Step 3.
      • If the network topology flapping does not occur, go to Step 2.

    2. Run the display stp [ process process-id ] [ instance instance-id ] [ interface interface-type interface-number ] [ brief ] command to check whether the number of TC BPDUs exceeds the set threshold on the interface.

      • If the number of TC BPDUs exceeds the set threshold on the interface, go to Step 4.
      • If the number of TC BPDUs does not exceed the set threshold on the interface, go to Step 7.

    3. Locate the cause of the network topology flapping and rectify the fault. Then, check whether the alarm is cleared. If the alarm persists, go to Step 2.
    4. Run the stp tc-protection threshold threshold command in the MSTP process view to reset the maximum number of TC BPDUs that the MSTP process can process. Then, check whether the alarm is cleared. If the alarm persists, go to Step 5.
    5. Check whether the malicious attack exists.

      • If the malicious attack exists, go to Step 6.
      • If the malicious attack does not exist, go to Step 7.

    6. Locate the attack source and remove the attack. Then, check whether the alarm is cleared. If the alarm persists, go to Step 7.
    7. Collect trap, log, and configuration information, and contact technical support personnel.
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Updated: 2019-04-20

Document ID: EDOC1100039602

Views: 179557

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