DELL 9.7(0.0) User Manual

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Policy-Based QoS Configurations
Policy-based QoS configurations consist of the components shown in the following example.
Figure 103. Constructing Policy-Based QoS Configurations
Classify Traffic
Class maps differentiate traffic so that you can apply separate quality of service policies to different types 
of traffic.
For both class maps, Layer 2 and Layer 3, the system matches packets against match criteria in the order 
that you configure them.
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Quality of Service (QoS)