Chapter 4. Policing and Shaping Tools

This chapter includes the following topics:

  • Policing, shaping, and the differences between the intent and operation of these techniques

  • Policing tools such as committed access rate (CAR) and class-based policing

  • Advanced policing topics, such as the single-rate and two-rate three-color policers, and hierarchical, multiaction, color-aware, and percentage-based policing

  • Shaping tools such as ATM and Frame Relay traffic shaping (FRTS), generic traffic shaping (GTS), and class-based shaping

Policers and shapers are the oldest forms of QoS mechanisms. These tools have similar objectives—namely, to identify and respond to traffic violations. Policers and shapers usually identify traffic violations in an identical manner. ...

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