This read-write integer object specifies the Class of Service priority value used on egress to determine the appropriate COS policer applied to the flow's outbound traffic, the egress-side counterpart to the ingress priority-mapping COS object. An administrator sets this to ensure outbound traffic for a given flow is policed according to the correct priority-based rate limit. For example, assigning a specific egress COS value to a flow ensures its outbound traffic is metered against the policer configured for that priority class rather than a default one.