ISIS_1.3.6.1.4.1.2011.5.25.24.2.4.14 hwIsisSeqNumExceedThreshold

Trap Buffer Description

The LSP sequence number has exceeded the upper threshold value. (SysInstance=[isisSysInstance], SysLevel=[isisSysLevelIndex], LspId=[isisPduLspId], ThresholdValue=0x[thresholdVal])

The LSP sequence number exceeds the specified upper threshold. After the sequence number of an IS-IS LSP exceeds a specified upper threshold, this alarm is generated. After the sequence number of an IS-IS LSP falls below a specified upper threshold, this alarm is cleared.

Trap Attributes

Trap Attribute Description

Alarm or Event

Alarm

Trap Severity

 Critical

Mnemonic Code

isisLspSeqThresholdExceed

Trap OID

1.3.6.1.4.1.2011.5.25.24.2.4.14

MIB

HUAWEI-ISIS-CONF-MIB

Alarm ID

0x00F10097

Alarm Name

isisLspSeqThresholdExceed

Alarm Type

communicationsAlarm

Raise or Clear

Raise

Match trap

ISIS_1.3.6.1.4.1.2011.5.25.24.2.4.15 hwIsisSeqNumExceedThresholdClear

Trap Buffer Parameters

Parameter Description

isisSysInstance

Indicates the IS-IS process ID.

isisSysLevelIndex

Indicates the IS-IS level.

isisPduLspId

Indicates the LSP ID.

thresholdVal

The upper threshold value of LSP sequence Number

VB Parameters

VB OID VB Name VB Index

1.3.6.1.3.37.1.1.1.1.1

isisSysInstance

isisSysInstance

1.3.6.1.3.37.1.2.1.1.1

isisSysLevelIndex

isisSysInstance

isisSysLevelIndex

1.3.6.1.3.37.1.10.1.1.1

isisPduLspId

isisSysInstance

Impact on the System

If the LSP sequence number exceeds the upper threshold of 0xFFFFFFFF for more than three times, the IS-IS instance system enters the sleep mode and stops sending or receiving IS-IS packets.

Possible Causes

Cause 1: An attacker simulated a locally generated LSP, set its sequence number to a value that is greater than the upper alarm threshold, and sent the LSP to the local device.

Cause 2: Another device on the network had the same IS-IS System ID as the local one.

Procedure

1. Run the display isis lsdb command to check the sequence number of the LSP generated by the local device.

  • If the sequence number increases normally, this log message is informational only, and no action is required.
  • If the sequence number increases too fast, go to step 2.

2. Run the timer lsp-refresh command in the IS-IS view to increase the value of the LSP refresh timer, and then run the display isis lsdb command to view the sequence number of the LSP generated by the local device.

  • If the sequence number increases normally, go to step 5.
  • If the sequence number still increases too fast, go to step 3.

3. Check whether there is a device whose system ID conflicts with the local system ID in the domain.

  • If so, change the system ID of one of the conflicting devices.
  • If no, go to Step 4.

4. Collect alarm and configuration information, and contact technical support personnel.

5. End.

Parent Topic: ISIS
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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