MSTP_1.3.6.1.4.1.2011.5.25.42.4.2.15 hwMstpiTcGuarded

Trap Buffer Description

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])

Specify that the instance received TC message exceeded the threshold when TC protection is enabled

Trap Attributes

Trap Attribute	Description
Alarm or Event	Event
Trap Severity	Warning
Mnemonic Code	TC_GUARDED
Trap OID	1.3.6.1.4.1.2011.5.25.42.4.2.15
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
InstanceID	Indicates the instance ID.
bridgePriority	Indicates the bridge priority.

VB Parameters

VB OID	VB Name	VB Index
1.3.6.1.4.1.2011.5.25.42.4.1.19.1.3	hwMstpiBridgePriority	hwMstpInstanceID

Impact on the System

If the number of TC BPDUs exceeds the threshold, MAC entries and ARP entries will not be deleted immediately, and network topology will not be changed immediately, either.

Possible Causes

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

Procedure

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 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 system view to reset the maximum number of TC BPDUs that the device 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 alarm information and configuration information, and then contact technical support personnel.