ISIS/5/ISIS_LSP_SEQ_THRESHOLD_EXCEED

Message

ISIS/5/ISIS_LSP_SEQ_THRESHOLD_EXCEED: The LSP sequence number has exceeded the upper threshold value. (isisSysInstance=[USHORT], isisSysLevelIndex=[USHORT], isisPduLspId=[STRING], srcMac=[STRING], recvFromIf=[STRING], thresholdValue=[STRING], LocalSeqNum=[STRING], RemoteSeqNum=[STRING])

Description

The LSP sequence number exceeded the upper alarm threshold.

Parameters

Parameter Name	Parameter Meaning
isisSysInstance	ID of an IS-IS process
isisSysLevelIndex	IS-IS level
isisPduLspId	LSP ID
srcMac	Source MAC address of the received LSP
recvFromIf	Name of the interface that received the LSP
thresholdValue	Upper alarm threshold, which is 0xF0000000.
LocalSeqNum	Local sequence number
RemoteSeqNum	Remote sequence number

Possible Causes

Cause 1: The sequence numbers increase to the upper alarm threshold as expected.

Cause 2: 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 3: Another device on the network had the same IS-IS System ID as the local one.

Procedure

Run the display isis lsdb command to check the sequence numbers of locally generated LSPs.
- If the sequence numbers increase as expected, no action is required.
- If the sequence numbers increase too fast, go to Step 2.
Run the timer lsp-refresh command in the IS-IS view to increase the LSP update interval and then run the display isis lsdb command to check the sequence numbers of locally generated LSPs.
- If the sequence numbers increase as expected, go to Step 5.
- If the sequence numbers increase too fast, go to Step 3.
Check whether there is another device on the network with the local IS-IS System ID.
- If such a device exists, change its system ID.
- If no such a device exists, go to Step 4.
Collect alarm information and configuration information, and then contact technical support personnel.
End.