Traffic conditioning contains two major components:
Policers— Policers perform traffic policing, which means dropping packets that exceed a defined rate to control the rate at which traffic passes through the policer. Examples of policers implemented by Cisco are the committed access rate (CAR) policer and the class-based policer. The goal of policing is to rate limit [...]

The conventions used to present command syntax in this book are the same conventions used in the Cisco IOS Software Command Reference. The Command Reference describes these
conventions as follows:
Vertical bars (|) separate alternative, mutually exclusive elements.
Square brackets [ ] indicate optional elements.
Braces indicate a required choice.
Braces within brackets indicate a required [...]

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