This read-create object sets the expense metric IS-IS advertises for reaching the destination configured in the corresponding csIsisIPRADest entry over this circuit, with zero reserved to mean the expense metric is unsupported. It lets a network favor cheaper links, such as owned fiber over metered satellite or leased circuits, when expense-based routing is in use. An administrator would set a high csIsisIPRAExpMetric on a metered cellular backup link's reachable address so it is only used when the primary path is unavailable.