With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
csySnmpAuthFail
csy Snmp Authenticaton Fail
1.3.6.1.4.1.9.9.131.1.5.1
The total number of SNMP messages received by the SNMP engine that were not properly authenticated.
Back to CISCO-SYSTEM-MIB MIB page.
IPHost Network monitor allows you to monitor csySnmpAuthFail 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.