This read-create enumerated value indicates the administrator's intent as to whether acknowledgement is desired for aggregation messages on this interface, and setting it on automatically switches csRsvpIfRRCapable on as well since acknowledgements only make sense within Refresh Reduction. It lets an administrator request reliable, acknowledged delivery of aggregated refresh messages for extra signaling robustness. An operator on a link where lost refresh messages have previously caused premature session teardown might set csRsvpIfAckDesired to on(2) to get acknowledged refresh delivery.