With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpaeUserGroupEntry
Cisco Port Access Entity User Group Entry
1.3.6.1.4.1.9.9.220.1.5.1
Information about an 802.1x authenticated user on the devices.
Back to CISCO-PAE-MIB MIB page.
IPHost Network monitor allows you to monitor cpaeUserGroupEntry 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.