vRtrPimNgCRPGrpMask 1.3.6.1.4.1.6527.3.1.2.50.1.13.1.5

The value of vRtrPimNgCRPGrpMask indicates the mask which is combined with vRtrPimNgCRPGrpAddr to get the range of multicast group addresses for which vRtrPimNgCRPAddress is the Candidate RP.