About Service Policy Definition
Service policies are specified using policy maps. Policy maps provide an ordered mapping of class maps to service levels. The order of the class maps within a policy map is important to determine the order in which the frame is compared to class maps. The first matching class map has the corresponding priority marked in the frame. You can specify multiple class maps within a policy map, and map a class map to a high, medium, or low service level. The default priority is low. Alternatively, you can map a class map to a differentiated services code point (DSCP). The DSCP is an indicator of the service level for a specified frame.
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