With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vtpLastDiscoverTime
vtp Last Discover Time
1.3.6.1.4.1.9.9.46.1.7.1.1.3
The value of sysUpTime at which the last discovery was completed. A value of zero indicates that no discovery has been invoked since last time the local system restarted.
Back to CISCO-VTP-MIB MIB page.
IPHost Network monitor allows you to monitor vtpLastDiscoverTime on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.
