Cisco Wireless: Ethernet frame too long Health Monitor

Summary

Too long ethernet frame is over threshold.

The number of frames that exceed the maximum permitted frame size is above the maximum threshold configured in Xian Network Manager 2012.

Causes

A frame is detected by this rule when the 'FrameTooLong' status is returned by the MAC service to the LLC (or other MAC user). Received frames for which multiple error conditions obtained are, according to the conventions of IEEE 802.3 Layer Management, counted exclusively according to the error status presented to the LLC.

A normal condition when ports add a frame tag of 4 bytes, resulting in a misleading Too Long Frame error. Others: A transceiver on the network is adding bits to the packets that are transmitted by the attached station; the jabber protection mechanism on a transceiver has failed; excessive noise on the cable; or faulty LAN driver.

Resolutions

In order to eliminate the error message in the normal condition, reduce your Ethernet packet frames by 4 bytes. Otherwise: use a network analyzer to identify the problematic transceiver and if necessary, replace the transceiver, network adapter, or station; replace the network card; check for improper cabling, faulty cables, faulty network equipment, or cables too close to noisy electronic equipment; or replace the faulty LAN driver.

Additional

Monitors the number of frames received on a particular interface that exceed the maximum permitted frame size.