Before You Begin
Before determining forwarding behavior, you should have defined classes and filters for the QoS policy. Though you often use the meter with the marker to control traffic, you can use the marker alone to define a forwarding behavior.
Not all traffic classes need to be marked.
The EF PHB guarantees that packets with the EF DSCP 46 (101110) are released onto the network before packets with any AF PHBs. Use the EF PHB for your highest-priority traffic. For more information about EF, refer to Expedited Forwarding (EF) PHB.
The following shows a portion of a QoS policy. This policy defines a class for a popular games application that generates a high level of traffic.
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The forwarding behaviors assign low-priority DSCPs to games_app traffic that conforms to its committed rate or is under the peak rate. When games_app traffic exceeds peak rate, the QoS policy indicates that packets from games_app are to be dropped. All AF codepoints are listed in Figure 5, Table 5, Assured Forwarding Codepoints.