With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vtpVlanIndex
vtp Vlan Index
1.3.6.1.4.1.9.9.46.1.3.1.1.1
The VLAN-id of this VLAN on ISL or 802.1q trunks.
Back to CISCO-VTP-MIB MIB page.
IPHost Network monitor allows you to monitor vtpVlanIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.