This example shows the console output that is displayed when this problem occurs:
May 29 21:54:14 JST: %MLS_STAT-SP-4-IP_LEN_ERR: MAC/IP length inconsistencies
May 29 23:10:44 JST: %MLS_STAT-SP-4-IP_LEN_ERR: MAC/IP length inconsistenciesDescription
These messages indicate that packets were received in which the IP length does not match the MAC length of the packet. The Supervisor Engine dropped these packets. There are no negative effects on the switch because it drops the packets. The switch reports the message for informational purposes. The cause of the issue is a device on the network that sends out bad packets. These issues, among others, can cause the bad packets:
Bad NIC drivers
Use a network sniffer in order to find the source that sends out the erroneous packets. Then, resolve the issue with the source device or application.
Re: How to deal with :%MLS_STAT-SP-4-IP_LEN_ERR: MAC/IP length i
The IP length errors indicate that you have a source sending in traffic with incorrect length in the headers. Narrow it down to what externally connected device can be sending in these bad packets. You can do this by shutting interfaces until you can narrow it down.
You can also get an idea of how many of such packets are being received by doing 'show mls stat ' multiple times and seeing how much the counts for "Errors" are incrementing.
But you need to try and narrow this down to the external source that's generating the frames which the earl detects as having bad lengths. IF you find it's coming from a specific traffic generator, then try a different traffic generator.
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