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Traffic ShapingTraffic shaping provides a mechanism to control the amount and volume of traffic being sent into a network, and the rate at which the traffic is being sent. For this reason, traffic shaping schemes need to be implemented at the network edges to control the traffic entering the network. It also may be necessary to identify traffic flows at the ingress point (the point at which traffic enters the network) with a granularity that allows the traffic-shaping control mechanism to separate traffic into individual flows and shape them differently 1. Two pre-dominate methods for shaping traffic exist: a leaky-bucket implementation and a token-bucket implementation. Both these schemes have distinctly different properties and are used for distinctly different purposes. In computer networking traffic shaping works by debursting traffic flows, that is smoothing the peaks and troughs of data transmission. Simple traffic shaping example - Before traffic shaping: 10 packets in one second, 0 packets in the next second, 10 packets in the next second, 0 packets the next second.
- After traffic shaping: 1 packet/0.2 seconds.
Benefits of traffic shaping When much traffic flows past a packet bottleneck (logical or physical) the benefits of traffic shaping are: Additionally off-site networks queues, such as often found on the provider side of dial-in connections, don't get filled up. That way smaller pingtimes can be achieved if Traffic shaping is combined with some sort of Quality of Service classification system. On/off behavior, especially with hysteresis, promotes packet-bursts: Technologies commonly using traffic shaping Traffic shaping is often used in combination with: See also References 1 Ferguson P., Huston G., Quality of Service: Delivering QoS on the Internet and in Corporate Networks, John Wiley & Sons, Inc., 1998. ISBN 0-471-24358-2. External Links
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