With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgspLinkUtilSent
Cisco GSP Link Utilization Sent
1.3.6.1.4.1.9.9.336.1.6.4.1.3
An estimate of the utilization of this link for traffic transmitted on this link in the time period defined by the cgspUtilSampleInterval object.
Back to CISCO-ITP-GSP-MIB MIB page.
IPHost Network monitor allows you to monitor cgspLinkUtilSent 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.