With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprClientCurrentInUcastClassAFrames
rpr Client Current In Ucast Class A Frames
1.0.8802.17.1.1.1.4.1.1.2
The number of MAC to client classA unicast frames in the current interval.
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprClientCurrentInUcastClassAFrames on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.