824 | Quality of Service (QoS)w w w . d e l l . c o m | s u p p o r t . d e l l . c o mPolicy-based QoS ConfigurationsPolicy-based QoS configurations consist of the components shown in Figure 39-9.Figure 39-9. Constructing Policy-based QoS ConfigurationsClassify TrafficClass maps differentiate traffic so that you can apply separate quality of service policies to each class. Forboth class maps, Layer 2 and Layer 3, FTOS matches packets against match criteria in the order that youconfigure them.Create a Layer 3 class mapA Layer 3 class map differentiates ingress packets based on DSCP value or IP precedence, andcharacteristics defined in an IP ACL. You may specify more than one DSCP and IP precedence value, butonly one value must match to trigger a positive match for the class map.1. Create a match-any class map using the command class-map match-any or a match-all class map usingthe command class-map match-all from CONFIGURATION mode, as shown in Figure 39-10.Input Service PolicyInputPolicyMap0 7 70Class Map Input QoSPolicyL3 ACLDSCPL3FieldsRatePolicingOutgoingMarkingRateLimiting WRED B/W %InputPolicyMapOutputPolicyMapOutputPolicyMapOutput Service PolicyInterfaceOutput QoSPolicy
