ISIS_1.3.6.1.3.37.2.0.15 isisOrigLSPBuffSizeMismatch

Description

ISIS/3/LSPMTU_MISMATCH: OID [oid] The size of the local buffer for originating IS-IS LSPs is smaller than the size of the received LSP. (sysInstance=[integer], sysInstanceofLevel=[integer], sysLevel=[integer], sysInstanceofCircIfIndex=[integer], circIndex=[integer], ifIndex=[integer], circIfIndex=[integer], pduLspId=[opaque], pduOriginatingBufferSize=[integer], ifName=[string])

The size of the local buffer for originating LSPs is smaller than the size of the received LSP.

Attribute

Alarm ID	Alarm Severity	Alarm Type
1.3.6.1.3.37.2.0.15	Minor	environmentalAlarm(6)

Parameters

Name	Meaning
oid	Indicates the MIB object ID of the alarm.
sysInstance	Indicates the ID of the IS-IS process.
sysInstanceofLevel	Indicates the ID of the IS-IS process.
sysLevel	Indicates the IS-IS level: 1: Level-1 2: Level-2
sysInstanceofCircIfIndex	Indicates the ID of the IS-IS process.
circIndex	Indicates the index of the interface.
ifIndex	Indicates the index of the interface.
circIfIndex	Indicates the IF index of the interface.
pduLspId	Indicates the ID of the LSP.
pduOriginatingBufferSize	Indicates the buffer size for originating LSPs.
ifName	Indicates the name of the interface.

Impact on the System

Routes cannot be learnt, and traffic forwarding is affected.

Possible Causes

The size of the LSPs originated from IS-IS on the source switch is larger than the size of the local buffer for originating LSPs.

Procedure

Run the display current-configuration configuration isis command on the local device to check the size of LSPs. If the command output does not contain the LSP size, the default LSP size is used. Run the display default-parameter isis command to check the LSP-Receive-Length field.
Find the source switch from which the LSPs are originated based on the lsp-id field value in the trap output. Run the display current-configuration configuration isis command to check the size of the LSPs on the source switch. If the command output does not contain the LSP size, the default LSP size is used. Run the display default-parameter isis command to check the LSP-Originate-Length field.
Check whether the value obtained in Step 1 is smaller than that obtained in Step 2.
- If so, go to Step 4.
- If not, go to Step 7.
Perform the following steps as required:
- If the size of the local receiving buffer for LSPs is a default value, go to Step 5.
- If the size of LSPs originated from the source switch is a default value, go to Step 6.
Run the lsp-length originate command in the IS-IS process of the source switch to modify the size of LSPs, and ensure that the size is smaller than or equal to the size of the local receiving buffer. Then, check whether the trap is cleared.
- If so, go to Step 8.
- If not, go to Step 7.
Run the lsp-length receive command in the IS-IS process to modify the size of the LSPs that can be received by the local switch, and ensure that the size is greater than or equal to the size of LSPs sent from the source switch. Then, check whether the trap is cleared.
- If so, go to Step 8.
- If not, go to Step 7.
Collect the trap information, log information, and configuration of the switch, and contact technical support personnel.
End.

Related Information

None.