With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprSpanStatsOutMcastClassBCirOctets
rpr Span Stats Out Mcast Class B Cir Octets
1.0.8802.17.1.1.1.3.4.1.37
The number of transmitted (MAC to PHY) classB CIR multicast and broadcast octets.
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprSpanStatsOutMcastClassBCirOctets 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.