With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgmGdoiGmEntry
Cisco GDOI Management Gdoi Gm Entry
1.3.6.1.4.1.9.9.759.1.2.2.1
An entry containing Local GDOI Group Member information, uniquely identified by Group & GM IDs. Because the Group Member is Local to the network device being queried, TEKs installed for this Group Member can be queried as well.
Back to CISCO-GDOI-MIB MIB page.
IPHost Network monitor allows you to monitor cgmGdoiGmEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.