With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpaeAuthFailUserEntry
Cisco Port Access Entity Authentication Fail User Entry
1.3.6.1.4.1.9.9.220.1.6.1
An entry appears in this table for each PAE port on the system which is assigned to Vlan of type 'authFail' via IEEE-802.1x authentication.
Back to CISCO-PAE-MIB MIB page.
IPHost Network monitor allows you to monitor cpaeAuthFailUserEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.