Shaping and Policing
Traffic-shaping tools delay packets exiting a router so that the overall bit rate does not exceed
a defined shaping rate. This chapter covers the concepts behind traffic shaping, as well as two
Cisco IOS shapers, namely Frame Relay Traffic Shaping (FRTS) and Class-Based Shaping (CB
Shaping).
Traffic policers measure bit rates for packets either entering or exiting an interface. If the defined
rate is exceeded, the policer either discards enough packets so that the rate is not exceeded, or
marks some packets such that the packets are more likely to be discarded later. This chapter
covers the concepts and configuration behind Class-Based Policing (CB Policing), with a brief
mention of committed access rate (CAR).