ISIS_1.3.6.1.3.37.2.0.11 isisVersionSkew

Description

ISIS/2/VERSION_SKEW:OID [oid] IS-IS received a PDU with incorrect ProtocolVersion. (sysInstance=[integer], sysInstanceofLevel=[integer], sysLevel=[integer], sysInstanceofCircIfIndex=[integer], circIndex=[integer], ifIndex=[integer], circIfIndex=[integer], pduProtocolVersion=[integer], pduFragment=[opaque], ifName=[string])

The IS-IS version number of the received Hello packet was inconsistent with that of the Hello packet supported by the local switch.

Attribute

Alarm ID	Alarm Severity	Alarm Type
1.3.6.1.3.37.2.0.11	Major	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.
pduProtocolVersion	Indicates the protocol version contained in a PDU.
pduFragment	Indicates the fragment of 64-byte PDU header.
ifName	Indicates the name of the interface.

Impact on the System

1. If the board modifies the packet, route flapping may occur, and the CPU usage will increase.

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

Possible Causes

1. The IS-IS version numbers supported by the local switch and other switch devices were inconsistent.

2. The version number field was modified during packet transmission.

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. Check whether the value of version field on the source switch is as 1.

If so, go to Step 4.
If not, go to Step 2.

**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

Check whether the IS-IS version number of the source switch can be modified.
- If so, go to Step 3.
- If not, go to Step 4.
Modify the IS-IS version number of the source switch. The Huawei switch does not support the modification of the IS-IS version number through a command. Then check whether the trap is cleared.
- If so, go to Step 5.
- If not, go to Step 4.
Collect the trap information, log information, and configuration of the switch, and contact technical support personnel.
End.

Related Information

None