With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdpvmDynPortsTable
Dynamic Port Vsan Membership Dyn Ports Table
1.3.6.1.4.1.9.9.421.1.1.8
This table contains the set of all ports that are operating with a dynamic VSAN on the local device.
Back to CISCO-DYNAMIC-PORT-VSAN-MIB MIB page.
IPHost Network monitor allows you to monitor cdpvmDynPortsTable 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.