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Verifying Service Level Agreements in an End-To-End QoS solution
KTH, Superseded Departments, Teleinformatics. (CCSlab)
2000 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This masters thesis describes ideas and methods aimed at solving the problem of verifying Service Level Agreements (SLA) in a Quality of Service (QoS) enabled IP network. Since an SLA very often specifies a contract between a service provider and customer, I found it necessary to approach the QoS concept from an end-to-end perspective. Not only figuring out how QoS is meant to work in a separate LAN, but how you actually provide a verifiable level of service end-to-end across multiple networks. To be able to come up with viable solutions and ideas to solve this task I divided my work into several phases.

First I built up a working knowledge about IP networks, how they function and interact to form larger networks, secondly I needed to understand the vast QoS area, what technologies and standards are in place today and how they work together to form IP networks with support for differentiated traffic.

Finally I needed to understand how to monitor and supervise IP networks on both small and larger scales, to see what techniques and methods are used to provide network administrators with sufficient information about the traffic in the network.

The first part of my thesis work provides information on these subjects giving a thorough understanding of all the different technologies.

The second part describes different solutions to the problem of monitoring QoS enabled IP networks. The problem really has many sides to it. Not only did I need to find out what to monitor, I also needed to find out how to monitor it. Generally SLAs are pretty simple, containing parameters such as uptime, maximum packet loss allowed and so on. These parameters are relatively easy to monitor. A QoS SLA is by its very nature more complex, both regarding parameters to monitor and in terms of responsibility placed on the customer. Depending on the nature of the agreement between customer and ISP, a QoS SLA could fit on a single sheet of paper or maybe 10 sheets. It all depends on the level of service complexity needing to be specified.

In view of the above and as a result of my work I have come up with a solution of how to monitor a DiffServ compliant network. This monitoring provides information suitable for the verification of SLAs. It enables monitoring of bandwidth, packet loss, delay and jitter for traffic.

Place, publisher, year, edition, pages
2000. , 98 p.
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-93539OAI: diva2:516914
Subject / course
Educational program
Master of Science in Engineering - Computer Science and Technology
2000-10-17, Seminar room "Telegrafen", Isafjordsgatan 22, Kista, 10:00 (English)
Available from: 2012-06-20 Created: 2012-04-20 Last updated: 2013-09-09Bibliographically approved

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