The value of vRtrPimNgGrpSrcRxRegFrmAnycstRP indicates
whether a register message for this source group combination
was received from the anycast RP and not from the designated
router connected to the source. vRtrPimNgGrpSrcRxRegFrmAnycstRP
is not applicable when the value of vRtrPimNgGrpSrcType is
starStarRP or starG.