6-1
6 QoS Policy Configuration
This chapter includes these sections:
z QoS Configuration Approach Overview
z Configuring a QoS Policy
z Displaying and Maintaining QoS Policies
QoS Configuration Approach Overview
Two approaches are available for configuring QoS: Non-Policy Approach and Policy Approach.
Some features support both approaches, but some support only one.
Non-Policy Approach
In non-policy approach, you configure QoS service parameters directly without using a QoS policy. For
example, you can use the line rate feature to set a rate limit on an interface without using a QoS policy.
Policy Approach
In policy approach, you configure QoS service parameters by using QoS policies. A QoS policy defines
the shaping, policing, or other QoS actions to take on different classes of traffic. It is a set of
class-behavior associations.
A class is a set of match criteria for identifying traffic. It uses the AND or OR operator:
z If the operator is AND, a packet must match all the criteria to match the class.
z If the operator is OR, a packet matches the class if it matches any of the criteria in the class.
A traffic behavior defines a set of QoS actions to take on packets, such as priority marking and redirect.
By associating a traffic behavior with a class in a QoS policy, you apply the specific set of QoS actions to
the class of traffic.
Configuring a QoS Policy
Figure 6-1 shows how to configure a QoS policy.
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