vRtrPimNgRPSetGrpMask 1.3.6.1.4.1.6527.3.1.2.50.1.14.1.4

vRtrPimNgRPSetGrpMask indicates the mask which is combined with vRtrPimNgRPSetGrpAddr to get the range of multicast group addresses for which vRtrPimNgRPSetCRPAddress is the candidate RP.