With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cDot11AssStatsRoamedIn
Cisco Dot11 Ass Statistics Roamed In
1.3.6.1.4.1.9.9.273.1.1.3.1.3
This object counts the number of stations roamed from another device to this device on this interface since device re-started.
Back to CISCO-DOT11-ASSOCIATION-MIB MIB page.
IPHost Network monitor allows you to monitor cDot11AssStatsRoamedIn on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.