With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vlanTrunkPortActiveVlansGroup
vlan Trunk Port Active Vlans Group
1.3.6.1.4.1.9.9.46.3.2.38
A collection of objects providing active vlan information for a trunking port in a management domain.
Back to CISCO-VTP-MIB MIB page.
IPHost Network monitor allows you to monitor vlanTrunkPortActiveVlansGroup on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.