With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vtpVersion
vtp Version
1.3.6.1.4.1.9.9.46.1.1.1
The version of VTP in use on the local system. A device will report its version capability and not any particular version in use on the device. If the device does not support vtp, the version is none(3).
Back to CISCO-VTP-MIB MIB page.
IPHost Network monitor allows you to monitor vtpVersion on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.
