With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprSpanDayInMcastClassBEirOctets
rpr Span Day In Mcast Class B Eir Octets
1.0.8802.17.1.1.1.3.3.1.16
The number of received (PHY to MAC) classB EIR multicast and broadcast octets
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprSpanDayInMcastClassBEirOctets 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.