ISIS_1.3.6.1.3.37.2.0.6 isisMaxAreaAddressesMismatch

Description

ISIS/2/MAXAREA_MISMATCH:OID [oid] The MaxAreaAddress field of received PDU is different from local configuration. (sysInstance=[integer], sysInstanceofLevel=[integer], sysLevel=[integer], pduMaxAreaAddress=[integer], sysInstanceofPduMaxAreaAddress=[integer], circIndex=[integer], ifIndex=[integer], circIfIndex=[integer], pduFrag=[opaque], ifName=[string])

The maximum number of area addresses supported in the header of the received Level-1 PDU mismatched with that supported by the local switch.

Attribute

Alarm ID	Alarm Severity	Alarm Type
1.3.6.1.3.37.2.0.6	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
pduMaxAreaAddress	Indicates the maximum number of area addresses.
sysInstanceofPduMaxAreaAddress	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.
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 by a hardware fault of the board, route flapping may occur and the CPU usage will increase.

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

Possible Causes

1. The maximum number of area addresses supported by the local switch mismatch the number of area addresses supported by other switch devices.

2. The maximum area address field was modified.

Procedure

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 switch. Then, find the value of the pdu-max-area field in the trap and check whether the number of maximum area addresses is neither 0 nor 3.

If so, go to Step 2.
If not, go to Step 3.

**Table 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

Modify the maximum number of area addresses of the source switch to 3. Then, check whether the trap is cleared.
- If so, go to Step 4.
- If not, go to Step 3.
Collect the trap information, log information, and configuration of the switch, and contact technical support personnel.
End.

Related Information

None