This read-create object sets the error metric IS-IS advertises for reaching the destination configured in the corresponding csIsisIPRADest entry over this circuit, again with zero reserved to mean this metric is not supported. It supports routing decisions based on link error rate rather than just hop count or delay, for deployments that make use of this optional ISO metric type. An administrator monitoring a noisy microwave link with frequent bit errors might assign it a high csIsisIPRAErrMetric so IS-IS steers traffic toward a cleaner alternate path when one exists.