With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
clsEnetPortDuplex
cls Enet Port Duplex
1.3.6.1.4.1.9.5.11.1.6.1.1.1
in half-duplex, full-duplex, or auto mode. If the port could not agree with the far end on port duplex, the port will be in auto(2) mode. Unknown(1) indicates either the port does not support duplex mode, or the duplex mode is none of the defined.
Back to CISCO-RHINO-MIB MIB page.
IPHost Network monitor allows you to monitor clsEnetPortDuplex 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.