This read-write object specifies the index into the Action table applied to packets that are in-profile (within the metered rate) for this metering class, with zero meaning no action, and the description notes a nonzero value is only valid for routed IP packets in Diffserv mode. An admin sets this to attach specific marking or handling behavior to conforming traffic. For example, an admin wanting in-profile Diffserv traffic to be remarked with a preferred DSCP value would point this field at the Action table entry that performs that remarking.