With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ctsvServerTestEnabled
ctsv Server Test Enabled
1.3.6.1.4.1.9.9.741.1.2.1.1.3
This object specifies whether the server-aliveness automated test is enabled or disabled for the AAA server. The server-aliveness automated test generates a periodic test RADIUS request message to the downloaded server and expects to get a response back in order to mark that downloaded server as alive, otherwise will mark it as dead.
Back to CISCO-TRUSTSEC-SERVER-MIB MIB page.
IPHost Network monitor allows you to monitor ctsvServerTestEnabled 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.