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Alarm Handling

AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009

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ISIS_1.3.6.1.3.37.2.0.5 isisIDLenMismatch

ISIS_1.3.6.1.3.37.2.0.5 isisIDLenMismatch

Description

ISIS/2/SYSID_MISMATCH:OID [oid] The ID length of received PDU is different from local configuration. (sysInstance=[integer], sysInstanceofLevel=[integer], sysLevel=[integer], sysInstanceofPduFieldLen=[integer], circIndex=[integer], ifIndex=[integer], pduFieldLen=[integer], circIfIndex=[integer], pduFrag=[opaque], ifName=[string])

The length of the system ID carried in the header of the received PDU, including all types of IS-IS packets, did not match the length of the system ID of the local router.

Attribute

Alarm ID Alarm Severity Alarm Type

1.3.6.1.3.37.2.0.5

Major

other(1)

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

sysInstanceofPduFieldLen

Indicates the ID of the IS-IS process.

circIndex

Indicates the index of the interface.

ifIndex

Indicates the index of the interface.

pduFieldLen

Indicates the length of the received PDU.

circIfIndex

Indicates the IF index of the interface.

pduFrag

Indicates the fragment of 64-byte PDU header.

ifName

Indicates the name of the interface.

Impact on the System

1. If the trap is triggered because of a hardware fault on the board, route flapping may occur.

2. If the trap is triggered because of intercommunication between router devices, neighbors cannot be established, or routes cannot be learnt from each other.

Possible Causes

1. The length of the system ID supported by other router devices mismatch with the length of the system ID supported by the local router.

2. The system ID Length field was modified during packet transmission.

Procedure

  1. Based on the IS-IS packet format defined in ISO10589, search for the pdu-fragment field (in hexadecimal) in the trap and fetch the system ID of the source router. Check whether the length of the system ID is neither 0 nor 6.

    • If so, go to Step 2.

    • If not, go to Step 3.

    Table 39-1  Methods of searching for system IDs and types of IS-IS packets

    Searching for the Packet Type

    Searching for the System ID

    Hello: the 5th byte in the pdu-fragment field being 0f, 10, or 11

    The system ID is continuous 6 bytes after the 10th byte in the pdu-fragment field

    LSP: the 5th byte in the pdu-fragment field being 12 or 14

    The system ID is continuous 6 bytes after the 13th byte in the pdu-fragment field

    SNP: the 5th byte in the pdu-fragment field being 18, 19, 1A, or 1B

    The system ID is continuous 6 bytes after the 11th byte in the pdu-fragment field

  2. Modify the system ID length configured on the source router to 6. Then, check whether the trap is cleared.

    • If so, go to Step 4.

    • If not, go to Step 3.

  3. Collect the trap information, log information, and configuration of the router, and contact technical support personnel.
  4. End.

Related Information

None

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Updated: 2019-05-06

Document ID: EDOC1000174085

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