With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgkLZoneStatsRcvdUnregistrationRequests
Cisco Gatekeeper L Zone Stats Received Unregistration Requests
1.3.6.1.4.1.9.10.40.1.1.4.4.1.1
The number of Unregistration Requests received for the local zone.
Back to CISCO-GATEKEEPER-MIB MIB page.
IPHost Network monitor allows you to monitor cgkLZoneStatsRcvdUnregistrationRequests 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.