With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vlanTrunkPortVtpEnabled
vlan Trunk Port Vtp Enabled
1.3.6.1.4.1.9.9.46.1.6.1.1.15
Some trunk interface modules allow VTP to be enabled/disabled seperately from that of the central device. In such a case this object provides management a way to remotely enable VTP on that module. If a module does not support a seperate VTP enabled state then this object shall always return 'true' and will accept no other value during a SET operation.
Back to CISCO-VTP-MIB MIB page.
IPHost Network monitor allows you to monitor vlanTrunkPortVtpEnabled on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.