With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cwrSnapValueIndex
Cisco Wireless Snap Value Index
1.3.6.1.4.1.9.9.136.1.9.3.1.1
This object represents the snapshot entry index number.
Back to CISCO-WIRELESS-IF-MIB MIB page.
IPHost Network monitor allows you to monitor cwrSnapValueIndex 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.