With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprSpanStatsInMcastClassBEirFrames
rpr Span Stats In Mcast Class B Eir Frames
1.0.8802.17.1.1.1.3.4.1.15
The number of received (PHY to MAC) classB EIR multicast and broadcast frames
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprSpanStatsInMcastClassBEirFrames 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.