With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alSyncStatsTxFrameTooLongErrors
ALTIGA Sync Statistics Tx Frame Too Long Errors
1.3.6.1.4.1.3076.2.1.2.32.2.1.21
The number of frames dropped this HDLC interface because they were long than the interface's MTU.
Back to ALTIGA-SYNC-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alSyncStatsTxFrameTooLongErrors on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.
