With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vsiVersionInUse
vsi Version In Use
1.3.6.1.4.1.9.9.162.1.1.1.7
The number of the VSI version currently being used by this controller. Protocol selection procedures dictate that this should be the highest value of protocol version, between vsiBaseVersionSupported and vsiTopVersionSupported, that is supported by all slaves. An exception to this rule will occur when the version is constrained to a specific value indicated by the vsiSpecifiedVersion object.
Back to CISCO-VSIMASTER-MIB MIB page.
IPHost Network monitor allows you to monitor vsiVersionInUse 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.