vRtrPimNgGrpSrcSpmsiRpfIfIndex 1.3.6.1.4.1.6527.3.1.2.50.1.9.1.41

The value of vRtrPimNgGrpSrcSpmsiRpfIfIndex indicates in an MVPN scenario the router's SPMSI interface index, if any, on which the RPF neighbor exists.