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Contribution Details

Type Master's Thesis
Scope Discipline-based scholarship
Title Service Quality Measurement in IP Networks
Organization Unit
Authors
  • Daniel Dönni
Supervisors
  • Burkhard Stiller
  • Peter Racz
Institution University of Zurich
Faculty Faculty of Economics, Business Administration and Information Technology
Date 2009
Abstract Text The Internet is a general-purpose network that can be used for a great variety of different applications. Using a particular application is only satisfactory if the application’s Quality of Service (QoS) requirements are met. Finding out whether the QoS requirements of an application are met requires a variety of network characteristics to be looked at. The IP Performance Metrics (IPPM) Working Group of the Internet Engineering Task Force (IETF) has therefore been working on a framework that allows to describe the characteristics of a network using a set of well-defined metrics. In order to determine the service quality characteristics of their networks, network operators have to measure these metrics. Hence, a measurement system is required that allows them to measure and monitor service quality in their networks. The system must be able to measure as many aspects of the network as possible because the more knowledge about the network is available, the better the needs of customers can be served. In this thesis a measurement architecture is developed and prototypically implemented that allows network operators to capture a wide range of QoS characteristics. The architecture is able to perform active and passive measurements based on the One-Way Active Measurement Protocol (OWAMP) and the Two-Way Active Measurement Protocol (TWAMP). For passive measurements, a packet marking approach is used. The architecture allows network operators to measure general network properties as well as the characteristics of a service and a service class. Furthermore, the behavior of customers using a particular service can be simulated. The measurement architecture can be adapted to the needs of network operators and be extended with arbitrary measurement applications. It complies with the IPv4 and IPv6 standards which allows for a seamless integration in existing networks. The architecture uses the Network Configuration Protocol (NETCONF) to configure the architectural components and the IP Flow Information Export (IPFIX) protocol to collect measurement data. Experimental results show that the approach produces little overhead and scales well, especially with respect to a large number of flows.
Zusammenfassung Mit der zunehmenden Verbreitung von Breitbandanschlüssen sind im Verlauf der letzten Jahre neue Anwendungen wie Voice over IP (VoIP) oder Video on Demand (VoD) immer populärer geworden. In Bezug auf Dienstgüte haben solche Echtzeit- und Multimediaanwendungen Anforderungen, welche von IP nicht garantiert werden können. Die Dienstgüte in IP Netzwerken muss deshalb periodisch gemessen und überwacht werden, um Kunden zufriedenzustellen und Service Level Agreements (SLAs) einzuhalten. Es gibt eine Vielzahl von isolierten Applikationen mit denen einzelne Dienstgüteaspekte gemessen werden können. Für Netzwerkbetreiber ist dies jedoch nicht ausreichend, sie benötigen ein integriertes System, mit dem verschiedenste Dienstgüteaspekte in Netzwerken bestimmt werden können. Obwohl bereits erste Messarchitekturen existieren, erfüllt keine die Bedürfnisse von Netzwerkbetreibern in vollem Umfang.
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