This read-create boolean indicates whether the associated group range is advertised with this RP as a BIDIR-PIM group range (true) or a standard PIM-SM group range (false), though the device's PIM implementation only supports the false value. It tells the BSR election process which multicast forwarding mode applies to the advertised RP-to-group mapping. Since only false is supported here, an admin attempting to set this true would encounter an inconsistent-value rejection on this platform.