With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cswmFlowResultRpfInterface
cswm Flow Result Rpf Interface
1.3.6.1.4.1.9.9.504.1.7.3.1.8
This object represents either the InterfaceIndex of RPF interface for a RPF flow or 0 (zero). The value of zero means that this flow is a non-RPF flow.
Back to CISCO-SWITCH-MULTICAST-MIB MIB page.
IPHost Network monitor allows you to monitor cswmFlowResultRpfInterface on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.