ISIS_1.3.6.1.3.37.2.0.2 isisManualAddressDrops

Description

ISIS/2/MANAREA_DROP:OID [oid] Some area addresses were discarded because the number of area addresses exceeded three. (sysInstance=[process-id], sysInstanceofLevel=[process-id], sysLevel=[level], sysInstanceofManAreaAddrExistState=[process-id], manAreaAddr=[area-address], manAreaAddrExistState=[area-address-state])

On the Level-1-2 switch, IS-IS leaked the Level-1 area addresses to the Level-2 area. As a result, the number of Level-2 area addresses was more than 3 and IS-IS selected the top three smallest area addresses as the Level-2 area addresses. This may lead to the loss of Level-2 area addresses of the local IS-IS system.

Attribute

Alarm ID	Alarm Severity	Alarm Type
1.3.6.1.3.37.2.0.2	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
sysInstanceofManAreaAddrExistState	Indicates the ID of the IS-IS process.
manAreaAddr	Indicates the area address. If the value is 0, it indicates the parameter is not used.
manAreaAddrExistState	Indicates the area address state: 1: active 2: notInService 3: notReady 4: createAndGo 5: createAndWait 6: destroy

Impact on the System

The Level-2 area addresses of the local IS-IS system may be lost.

Possible Causes

On the Level-1-2 switch, IS-IS leaked the Level-1 area addresses to the Level-2 area. When the number of Level-2 area addresses exceeded 3, IS-IS selected top three smallest area addresses. Then, the local area addresses in the Level-2 area may be lost.

Procedure

Run the display isis lsdb level-1 verbose command to check the detailed information about the Level-1 IS-IS LSDB, and the AREA ADDR field carried in the LSP with the LSP fragment ID being 0. Then, count the number of different Level-1 area addresses to check whether the number is larger than three.
- If so, go to step 2.
- If not, go to step 3.
Run the display isis lsdb { level-1 | level-2 } verbose command to check whether the value of the Level-1 Area Address field is the same as the value of the Level-2 Area Address field in the LSP with the fragment number being 0 on the local switch.
Collect the trap information, log information, and configuration of the switch, and contact technical support personnel.
End.

Related Information

None