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Alarm Handling

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the trap description, attributes, parameters, impact on the system, possible causes, procedures, and references. This document provides a complete set of traps, through which intended readers are kept of the running status of the device so as to locate faults.
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ISIS_1.3.6.1.3.37.2.0.12 isisAreaMismatch

ISIS_1.3.6.1.3.37.2.0.12 isisAreaMismatch

Description

ISIS/3/AREA_MISMATCH:OID [oid] IS-IS received a level-1 Hello PDU whose area address is different from the local area address. (sysInstance=[integer], sysInstanceofLevel=[integer], sysLevel=[integer], sysInstanceofCircIfIndex=[integer], circIndex=[integer], ifIndex=[integer], circIfIndex=[integer], pduFragment=[opaque], ifName=[string])

The area address of the received Level-1 Hello packet was different from that of the local Level-1 IS-IS.

Attribute

Alarm ID Alarm Severity Alarm Type

1.3.6.1.3.37.2.0.12

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.

pduFragment

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 of the board, route flapping may occur and the CPU usage will increase.

2. If the trap is triggered because of incorrect configuration, neighbors cannot be established, and routes cannot be learnt from each other.

Possible Causes

1. The configuration was incorrect.

2. The area address field was modified.

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. Then, run the display this command in the IS-IS view to check whether the area address configured on the source router is the same as that of the local router.

    • If so, go to Step 3.

    • If not, go to Step 2.

    Table 40-6  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. Run the network-entity command in the IS-IS view of the source router to configure a new IS-IS area address so that the area address of the router is consistent with that of the local router. 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: 2019-03-06

Document ID: EDOC1100041475

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