With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprSpanStatsOutUcastClassCOctets
rpr Span Stats Out Ucast Class C Octets
1.0.8802.17.1.1.1.3.4.1.33
The number of transmitted (MAC to PHY) classC unicast octets
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprSpanStatsOutUcastClassCOctets on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.