3com S7906E Instruccion De Instalación

 

2-1 

This chapter covers the following topics: 

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Configuring a QoS Policy 

Two approaches are available for you to configure QoS: policy-based and non policy-based.  

Some QoS features can be configured in either approach while some can be configured only in one 

approach.  

In the non policy-based approach, you configure QoS service parameters without using a QoS policy. 

For example, to rate limit an interface, you can use the line rate feature to directly configure a rate limit 

on the interface rather than using a QoS policy.  

In the policy-based approach, QoS service parameters are configured through configuring QoS policies. 

A QoS policy defines what QoS actions to take on what class of traffic for purposes such as traffic 

shaping or traffic policing.  

Before configuring a QoS policy, be familiar with these concepts: class, traffic behavior, and policy.  

Classes are used to identify traffic.  

A class is identified by a class name and contains some match criteria for traffic identification. The 

relationship between the criteria is AND or OR.  

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AND: A packet is considered as belonging to a class only when the packet matches all the criteria 

in the class.  

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OR: A packet is considered as belonging to a 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 traffic 

redirecting.  

A policy associates a class with a traffic behavior to define what actions to take on which class of traffic. 

You can configure multiple class-behavior associations in a policy.