The value of vRtrPimNgCRPGrpPrefixInetGrpAddr combined with the value
of vRtrPimNgCRPGrpPrefixInetGrpMask indicates the range of multicast
group addresses for which the router advertizes to be the
Candidate RP. The value of vRtrPimNgAFGenCRPAddress is sent as the
RP address.