TAILIEUCHUNG - Traffic Shaping and Policing

Both shaping and policing mechanisms are used in a network to control the rate at which traffic is admitted into the network. Both mechanisms use classification, so they can differentiate traffic. They also use metering to measure the rate of traffic and compare it to the configured shaping or policing polic y. The difference between shaping and policing can be described in terms of their rate-limiting implementation: n Shaping meters the traffic rate and delays excessive traffic so that it stays within the desired rate limit. With shaping, traffic bursts are smoothed out producing a steadier flow of data. Reducing traffic bursts helps reduce congestion in the core of. | 4 Traffic Shaping and Policing Overview This module describes for the QoS mechanisms that are used to limit the available bandwidth to traffic classes. It discusses two options traffic policing and traffic shaping. Committed Access Rate CAR is discussed as a mechanism to provide traffic policing. Generic Traffic Shaping GTS and Frame Relay Traffic Shaping FRTS are discussed as traffic shaping mechanisms. It includes the following topics Traffic Shaping and Policing Generic Traffic Shaping Frame Relay Traffic Shaping Committed Access Rate Objectives Upon completion of this module you will be able to perform the following tasks Describe and configure Generic Traffic Shaping GTS Describe and configure Frame Relay Traffic Shaping FRTS Describe and configure Committed Access Rate CAR Identify other mechanisms that support traffic shaping and policing Classbased Policing and Class-based Shaping Traffic Shaping and Policing Overview The lesson introduces mechanisms for traffic policing and traffic shaping. Committed Access Rate CAR Generic Traffic Shaping GTS and Frame Relay Traffic Shaping FRTS are introduced in this section. Objectives Upon completion of this lesson you will be able to perform the following tasks Describe the need for implementing traffic policing and shaping mechanisms List traffic policing and shaping mechanisms available in Cisco IOS Describe the benefits and drawbacks of traffic shaping and policing mechanisms 4-2 IP QoS Traffic Shaping and Policing Copyright 2001 Cisco Systems Inc. Traffic Shaping and Policing stream Traffic Shaping and Policing mechanisms are used to rate-limit traffic classes They have to be able to classify packets and meter their rate of arrival Traffic Shaping delays excess packets to stay within the rate limit Traffic Policing typically drops excess traffic to stay within the limit alternatively it can remark excess traffic 2001 Cisco Systems Inc. IP QoS Traffic Shaping and Policing-5 Both shaping and policing .

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