vRtrPimNgGrpSrcSpmsiIfIndex 1.3.6.1.4.1.6527.3.1.2.50.1.10.1.2

The value of vRtrPimNgGrpSrcSpmsiIfIndex indicates in an MVPN scenario the router's SPMSI interface index, if any, corresponding to the outgoing IPMSI interface.