With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vmMembershipTable
vm Membership Table
1.3.6.1.4.1.9.9.68.1.2.2
A table for configuring VLAN port membership. There is one row for each bridge port that is assigned to a static or dynamic access port. Trunk ports are not represented in this table. An entry may be created and deleted when ports are created or deleted via SNMP or the management console on a device.
Back to CISCO-VLAN-MEMBERSHIP-MIB MIB page.
IPHost Network monitor allows you to monitor vmMembershipTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.