With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vtpVlanIfIndexGroup
vtp Vlan If Index Group
1.3.6.1.4.1.9.9.46.3.2.18
A collection of objects providing information for mapping of VLAN ID to its corresponding ifIndex.
Back to CISCO-VTP-MIB MIB page.
IPHost Network monitor allows you to monitor vtpVlanIfIndexGroup 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.