Users Guide

Policy-Based QoS Configurations
Policy-based QoS configurations consist of the components shown in the following example.
Figure 122. 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.
Creating a Layer 3 Class Map
A Layer 3 class map differentiates ingress packets based on the DSCP value, IP precedence, VLANs, or characteristics defined in an IP
ACL. You can also use VLAN IDs and VRF IDs to classify the traffic using layer 3 class-maps.
You can specify more than one DSCP and IP precedence value, but only one value must match to trigger a positive match for the class
map.
NOTE
: IPv6 and IP-any class maps cannot match on ACLs or VLANs.
808 Quality of Service (QoS)