MLS message about MAC/IP length inconsistencies

[c.vergara]

On Cat6500 with native IOS are appear the following message:

%MLS_STAT-SP-4-IP_LEN_ERR: MAC/IP length inconsistencies

This messages say that a PC with a bad NIC, bad driver or bad application is sending frame errors.

But I need to know any IOS command to find in what vlan is this PC.

can anyone help me ?

[Prashanth Krishnappa]

There is a way to determine the source in Native IOS but very detailed. I suggest that you open a TAC service request so that you get the details

[c.vergara]

Hi,

Is there a risk in the Cat6500's operation with the way to find the source of the problem ?

Do you have any document about this ? Before open the case.

regards.

[Prashanth Krishnappa]

There is no document on CCO. This message is caused by a bad packet coming in and is harmless. If you wish to you can turn off these messages in newer IOS using the following command

6500(config)#no mls verify ip ?

checksum check for packet checksum errors

length check for packet length errors

If you want to find the actual device, there is a procedure you need to use along with a sniffer. Open a TAC service request and an engineer can guide you through the process.