MSTP/4/PORT_LOOP_GUARDED

Message

MSTP/4/PORT_LOOP_GUARDED: The loop protection port did not receive BPDU packets within prescriptive time. (InstanceID=[InstanceID], PortIndex=[PortIndex], IfIndex=[IfIndex], PortName=[PortName], PwName=[PwName])

Description

Specify that the root port has not received any BPDU packets for a long time when loop protection is enabled

Parameters

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

Possible Causes

Cause 1: The spanning tree function was disabled on the peer device. Cause 2: The links connected to the peer were congested.

Procedure

Cause 1: The spanning tree function was disabled on the peer device.

1. Run the display stp [ process ] [ instance ] [ interface | slot | vsi pw ] [ brief ] command to check whether STP is disabled on the interfaces that are directly connected.

If STP is disabled on the interfaces that are directly connected, go to Step 2.
If STP is enabled on the interfaces that are directly connected, go to Step 3.

2. Run the stp enable command in the interface view to enable STP. Then, check whether the alarm is cleared. If the alarm persists, go to Step 3.

3. Collect alarm information and configuration information, and then contact technical support personnel.

Cause 2: The links connected to the peer were congested.

1. Check whether the link between the local device and the neighbor device is congested.

If the link is congested, go to Step 2.
If the link is not congested, go to Step 3.

2. Repair the physical link and then check whether the alarm is cleared. If the alarm persists, go to Step 3.

3. Collect alarm information and configuration information, and then contact technical support personnel.