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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/PORT_ROOT_GUARDED

MSTP/4/PORT_ROOT_GUARDED

Message

MSTP/4/PORT_ROOT_GUARDED:The root protection port received a superior message. (InstanceID=[InstanceID], PortIndex=[PortIndex], IfIndex=[IfIndex], PortName=[PortName], PwName=[PwName])

Description

The port that has root protection enabled received BPDUs with higher priorities.

Parameters

Parameter Name Parameter Meaning
InstanceID Indicates the instance ID.
PortIndex Indicates the interface ID.
IfIndex Indicates the interface index.
PortName Indicates the port name.
PwName Indicates the PW name.

Possible Causes

Cause 1: The port that has root protection enabled received BPDUs of higher priorities than that of the bridge.

Cause 2: The priorities of some switches changed on the network.

Procedure

  • Cause 1: The port that has root protection enabled received BPDUs of higher priorities than that of the bridge.
    1. Check whether the added physical link is necessary.

      • If the added physical link is necessary, go to Step 2.
      • If the added physical link is unnecessary, go to Step 3.

    2. Run the display stp [ process process-id ] [ instance instance-id ] [ interface interface-type interface-number | slot slot-id ] [ brief ] command to check whether the interfaces are consistent with the STP calculation results.

      • If the interfaces are consistent with the STP calculation results, no action is required.
      • If the interfaces are inconsistent with the STP calculation results, go to Step 4.

    3. Correctly deploy the network topology, and then check whether the alarm is cleared. If the alarm persists, go to Step 4.
    4. Run the display stp [ process process-id ] [ instance instance-id ] [ interface interface-type interface-number ] [ brief ] command to check whether an interface is under the protection of the root bridge.

      • If an interface is under the protection of the root bridge, go to Step 5.
      • If no interface is under the protection of the root bridge, go to Step 6.

    5. Run the undo stp root-protection command in the interface view to delete the configuration of the protection under the root bridge. Then, check whether the alarm is cleared. If the alarm persists, go to Step 6.
    6. Collect trap, log, and configuration information, and contact technical support personnel.
  • Cause 2: The priorities of some switches changed on the network.
    1. Run the display stp [ process process-id ] [ instance instance-id ] [ interface interface-type interface-number ] [ brief ] command to check whether the operation of changing the priority is correct.

      • If the operation is correct, go to Step 3.
      • If the operation is incorrect, go to Step 2.

    2. Run the stp [ instance instance-id ] priority priority command to reset the priority of the local bridge as required. Alternatively, run the undo stp [ instance instance-id ] priority command or the undo stp [ instance instance-id ] root command to restore the default value of the priority of the local bridge. Then, check whether the alarm is cleared. If the alarm persists, go to Step 3.
    3. Run the display stp [ process process-id ] [ instance instance-id ] [ interface interface-type interface-number ] [ brief ] command to check whether an interface is under the protection of the root bridge.

      • If an interface is under the protection of the root bridge, go to Step 4.
      • If no interface is under the protection of the root bridge, go to Step 5.

    4. Run the undo stp root-protection command in the interface view to delete the configuration of the protection under the root bridge. Then, check whether the alarm is cleared. If the alarm persists, go to Step 5.
    5. Collect trap, log, and configuration information, and contact technical support personnel.
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Updated: 2019-04-20

Document ID: EDOC1100039602

Views: 301155

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