The value of vRtrRsvpIfReliableDelivery specifies whether reliable
delivery of RSVP messages over the RSVP interface is enabled. When
the value of vRtrRsvpIfReliableDelivery is 'true' reliable delivery
of RSVP messages over RSVP interface is enabled.
vRtrRsvpIfReliableDelivery is not valid if vRtrRsvpIfRefreshReduction
is disabled, i.e. when vRtrRsvpIfRefreshReduction is set to 'false'.