The length of time route information learned over the RPI join is retained for after the failure of the join. Increasing this value allows the RPI join more time to recover before treating the routes learned over the join as gone, but causes outdated state to remain programmed for longer. This field is not suitable for network administrators. This field cannot be changed after initial creation of the entity. Instead of changing this field, create a new DC-L2VPN Manager entity with the new value and destroy the old entity.