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

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Chapter 11. Policing and Shaping Overview

Cisco IOS QoS offers two kinds of traffic regulation mechanisms: the rate-limiting feature of committed access rate (CAR) for policing traffic, and Generic Traffic Shaping (GTS) and Frame Relay Traffic Shaping (FRTS) for shaping traffic. You can deploy these features throughout your network to ensure that a packet, or data source, adheres to a stipulated contract and to determine the QoS to render the packet. Both policing and shaping mechanisms use the traffic descriptor for a packet—indicated by the packet's classification—to ensure adherence and service. (See Chapter 1, "Classification Overview," for a description of a traffic descriptor.)

Policers and shapers usually identify traffic descriptor violations ...

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