This read-write integer object specifies the Class of Service value that a given ingress priority marking (identified by cmIngressPrioMapInPriority) is translated into, which in turn determines the appropriate COS policer applied to that traffic. An administrator sets this mapping so incoming DSCP, TOS, or 802.1p markings are consistently converted into the device's internal priority scheme. For example, mapping a specific high-value DSCP codepoint to COS 7 here ensures traffic marked that way gets routed to the highest-priority policer and queue.