Traffic Shaping is a term for defining the amount of network bandwidth reserved for specific protocols and applications. To enforce traffic shaping rules QoS mechanisms such as DSCP and CoS tags are used.

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Traffic shaping regulates how much bandwidth different kinds of traffic can use, so the network remains predictable. To enforce those rules, QoS mechanisms categorize and prioritize traffic by marking it: DSCP in IP headers identifies the traffic class, and CoS in Ethernet frames does the same at Layer 2. When devices see these marks, they place packets into the appropriate queues and apply the shaping policy—delaying or limiting packets as needed to meet the configured rates and priorities. So using DSCP and CoS tags to enforce shaping rules is correct because these marks give network devices the information they need to implement the intended bandwidth and priority allocations. Keep in mind that the actual amount of bandwidth reserved depends on policy and network capacity, but the mechanism of enforcement via DSCP/CoS is the right pairing.