This read-create integer object specifies the ingress Class of Service value assigned to this FlowPoint, used when the flow point is not configured for multiple COS and instead needs one fixed classification. An administrator sets this to a specific COS value to ensure all of that flow's ingress traffic receives a consistent, predictable priority treatment. For example, setting this to a high-priority COS value on a flow point carrying a premium service tier ensures that traffic is queued ahead of standard best-effort flows.