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Cisco IOS™ 12.0 Quality of Service by Cisco Systems, Inc.

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Chapter 1. Classification Overview

Classification entails using a traffic descriptor to categorize a packet within a specific group to define that packet and make it accessible for quality of service (QoS) handling on the network. Using packet classification, you can partition network traffic into multiple priority levels or classes of service. When traffic descriptors are used to classify traffic, the source agrees to adhere to the contracted terms and the network promises a QoS. Traffic policers, such as committed access rate's (CAR's) rate-limiting feature, and traffic shapers, such as Frame Relay Traffic Shaping (FRTS) and Generic Traffic Shaping (GTS), use a packet's traffic descriptor—that is, its classification—to ensure adherence to the ...

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