TAILIEUCHUNG - Thực hiện chất lượng dịch vụ trong các mạng IP (P7)

Measurements NO I AYTON (Know thyself; Inscription on the fa ade of Apollo’s temple in Delphi) c The traffic engineering process for IP networks includes obtaining feedback from the network as the basis of assessing the need to modify transport network parameters and to optimize its behaviour. Obtaining information in precise and meaningful form is imperative for being able to make the right adjustments to improve the network performance. This chapter deals with the means of monitoring service quality, the analysis methods applied to measurement data, and examples of network performance optimization based on processed measurement information | 7 Measurements VNO IVAYTON Know thyself Inscription on the façade of Apollo s temple in Delphi The traffic engineering process for IP networks includes obtaining feedback from the network as the basis of assessing the need to modify transport network parameters and to optimize its behaviour. Obtaining information in precise and meaningful form is imperative for being able to make the right adjustments to improve the network performance. This chapter deals with the means of monitoring service quality the analysis methods applied to measurement data and examples of network performance optimization based on processed measurement information. A formulation of the goals and methods of traffic engineering measurements in IP networks has been given in a recent Internet draft LCT 02 . This draft will be used as an introduction to the topic in this chapter quoting other sources and adding issues specific to multi-service networks as necessary. In the draft ISPs are singled out as one likely user for the methods presented. The scope of the conceptual framework development therein is intra-domain operations but the definitions are intended to be transferable also across operator domain boundaries. As such Implementing Service Quality in IP Networks Vilho Raisanen 2003 John Wiley Sons Ltd ISBN 0-470-84793-X 212 MEASUREMENTS they should be applicable to different per-domain technologies as well. The need for consistency precision and effectiveness of traffic engineering methods is cited as the reason for applying an overarching framework for traffic engineering. The ultimate goal of measurements is to serve the needs of the traffic engineering process including forecasting planning dimensioning control and performance monitoring. The major tasks of traffic engineering measurements are defined in LCT 02 as traffic characterization network monitoring traffic control. These will be discussed in more detail later in this chapter. Let us note in passing again that in multi-service .

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