With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cD11HtPhyCurrentControlChannel
Cisco DOT11 High-Throughput Physical Current Control Channel
1.3.6.1.4.1.9.9.607.1.1.2.1.6
This object represents the operating channel. If 40 MHz mode is currently in use then this object indicates the control channel.
Back to CISCO-DOT11-HT-PHY-MIB MIB page.
IPHost Network monitor allows you to monitor cD11HtPhyCurrentControlChannel 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.