MSTP_1.3.6.1.4.1.2011.5.25.42.4.2.25 hwMstpProLoopbackDetected

Trap Buffer Description

The MSTP process's port has been set to discarding state because of detecting loopback. (ProcessID=[ProcessID], InstanceID=[InstanceID], PortID1=[PortID1], PortID2=[PortID2], PortID3=[PortID3], PortID4=[PortID4], PortIDFlag=[PortIDFlag], PortState=[PortState], IfIndex=[IfIndex], PortName=[PortName], PwName=[PwName])

When port detected loopback, block the port and arise trap

Trap Attributes

Trap Attribute	Description
Alarm or Event	Event
Trap Severity	Warning
Mnemonic Code	PROLOOPBACK_DETECTED
Trap OID	1.3.6.1.4.1.2011.5.25.42.4.2.25
MIB	HUAWEI-MSTP-MIB
Alarm ID	This is an event trap and does not involve alarm ID.
Alarm Name	This is an event trap and does not involve alarm name.
Alarm Type	This is an event trap and does not involve alarm type.
Raise or Clear	This is an event trap and does not involve alarm generation or clearance.
Match trap	-

Trap Buffer Parameters

Parameter	Description
ProcessID	Indicates the MSTP process ID.
InstanceID	Indicates the instance ID.
PortID1	Indicates ID 1 of the port in the MSTP process.
PortID2	Indicates ID 2 of the port in the MSTP process.
PortID3	Indicates ID 3 of the port in the MSTP process.
PortID4	Indicates ID 4 of the port in the MSTP process.
PortIDFlag	Indicates the port flag.
PortState	Indicates the port state.
IfIndex	Indicates the interface index.
PortName	Indicates the port name.
PwName	Indicates the PW name.

VB Parameters

VB OID	VB Name	VB Index
1.3.6.1.4.1.2011.5.25.42.4.1.29.1.1	hwMstpProNewPortState	hwMstpProID hwMstpInstanceID hwMstpPortId1 hwMstpPortId2 hwMstpPortId3 hwMstpPortId4 hwMstpPortIdFlag
1.3.6.1.2.1.31.1.1.1.1	ifName	ifIndex
1.3.6.1.4.1.2011.5.25.42.4.1.33	hwMstpPwName	-

VB OID

VB Name

VB Index

1.3.6.1.4.1.2011.5.25.42.4.1.29.1.1

hwMstpProNewPortState

hwMstpProID

hwMstpInstanceID

hwMstpPortId1

hwMstpPortId2

hwMstpPortId3

hwMstpPortId4

hwMstpPortIdFlag

1.3.6.1.2.1.31.1.1.1.1

ifName

ifIndex

1.3.6.1.4.1.2011.5.25.42.4.1.33

hwMstpPwName

Impact on the System

After detecting a port blocked by local loopback, the system considers that a network storm occurs and blocks the local port to prevent the network storm from affecting services of the entire network. Services on the blocked port will be interrupted.

Possible Causes

The STP port of the equipment detected a loopback.

Procedure

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

If a local loopback is configured on the interface where the alarm is generated, go to Step 3.
If no local loopback is configured on the interface where the alarm 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. Delete the local loopback configuration, and check whether the alarm is cleared. If the alarm persists, go to Step 5.

4. Remove the self-loop network cable from the hub and check whether the alarm is cleared. If the alarm persists, go to Step 5.

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