With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vtpVlanTable
vtp Vlan Table
1.3.6.1.4.1.9.9.46.1.3.1
This table contains information on the VLANs which currently exist.
Back to CISCO-VTP-MIB MIB page.
IPHost Network monitor allows you to monitor vtpVlanTable 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.