Setup Guide
Policy-Based QoS Congurations
Policy-based QoS congurations consist of the components shown in the following example.
Figure 124. Constructing Policy-Based QoS Congurations
Classify Trac
Class maps dierentiate trac so that you can apply separate quality of service policies to dierent types of trac.
For both class maps, Layer 2 and Layer 3, the system matches packets against match criteria in the order that you congure them.
Creating a Layer 3 Class Map
A Layer 3 class map dierentiates ingress packets based on the DSCP value, IP precedence, VLANs, or characteristics dened in an IP
ACL. You can also use VLAN IDs and VRF IDs to classify the trac 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.
Quality of Service (QoS) 847