With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
csiNportInFrameRate
csi Nport In Frame Rate
1.3.6.1.4.1.9.9.378.1.1.4.1.3
Number of incoming frames per second on this virtual N-port.
Back to CISCO-SVC-INTERFACE-MIB MIB page.
IPHost Network monitor allows you to monitor csiNportInFrameRate 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.