With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rcvFramesDiscIllegalHeader
rcv Frames Disc Illegal Header
1.3.6.1.4.1.351.110.5.1.1.2.1.1.1.10
The number of frames discarded on the ingress due to illegal header.
Back to CISCO-WAN-FR-PORT-MIB MIB page.
IPHost Network monitor allows you to monitor rcvFramesDiscIllegalHeader on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.