This read-create value, in milliseconds, is the RSVP 'R' parameter setting the minimum period between refresh transmissions of a given PATH or RESV message on this interface. It controls the baseline signaling overhead RSVP generates on the link, since every active session is periodically re-announced at roughly this interval. An administrator on a bandwidth-constrained link with many active RSVP sessions might lengthen csRsvpIfRefreshInterval to reduce the volume of refresh traffic, trading off slightly slower failure detection.