With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprSpanCurrentOutUcastClassBEirOctets
rpr Span Current Out Ucast Class B Eir Octets
1.0.8802.17.1.1.1.3.1.1.24
The number of transmitted (MAC to PHY) classB EIR unicast octets in the current interval.
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprSpanCurrentOutUcastClassBEirOctets 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.