ISIS/2/ISIS_VERSION_SKEW

Message

ISIS/2/ISIS_VERSION_SKEW: IS-IS received a PDU with incorrect ProtocolVersion. (isisSysInstance=[isisSysInstance], isisSysLevelIndex=[isisSysLevelIndex], isisCircIndex=[isisCircIndex], isisCircIfIndex=[isisCircIfIndex], isisPduProtocolVersion=[isisPduProtocolVersion], isisPduFragment=[isisPduFragment], ifIndex=[ifIndex], IfName=[IfName])

Description

IS-IS received a Hello packet with the IS-IS version number not supported by the local device.

Parameters

Parameter Name	Parameter Meaning
isisSysInstance	ID of an IS-IS process
isisSysLevelIndex	IS-IS level
isisCircIndex	Circuit IfIndex of an interface
isisCircIfIndex	Circuit IfIndex of an interface
isisPduProtocolVersion	Version number
isisPduFragment	64-byte PDU header
ifIndex	IfIndex of an interface
IfName	Interface name

Possible Causes

Cause 1: The number of the IS-IS version supported by the local device was different from that supported by another device.

Cause 2: The value of the version number field was changed during the packet transmission.

Procedure

1. Based on the IS-IS packet format defined in ISO10589, check the isisPduFragment field (in hexadecimal) of the binary packet and obtain the system ID of the source device. Check whether the value of the isisPduProtocolVersion field is 1.

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

2. Check the logs and ping packets to determine whether a hardware fault on the board causes the packets to be changed.

If so, go to Step 3.
If not, go to Step 6.

3. Replace the board and then check whether the fault is rectified.

If so, go to Step 7.
If not, go to Step 6.

4. Check whether the IS-IS version number on the source device can be changed.

If so, go to Step 5.
If not, go to Step 6.

5. Change the IS-IS version number of the source device (The IS-IS version number cannot be changed on the Huawei device). Check whether the fault is rectified.

If so, go to Step 7.
If not, go to Step 6.

6. Collect log information and configuration information, and then contact technical support personnel.

7. End.