Traffic Measurements for Link Dimensioning: A Case Study

M. Brunner (Editor), R. van de Meent, Aiko Pras, A. Keller (Editor), M.R.H. Mandjes, Hans Leo van den Berg, Lambertus Johannes Maria Nieuwenhuis

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Abstract

Traditional traffic measurements meter throughput on time scales in the order of 5 minutes, e.g., using the Multi Router Traffic Grapher (MRTG) tool. The time scale on which users and machines perceive Quality of Service (QoS) is, obviously, orders of magnitudes smaller. One of many possible reasons for degradation of the perceived quality, is congestion on links along the path network packets traverse. In order to prevent quality degradation due to congestion, network links have to be dimensioned in such a way that they appropriately cater for traffic bursts on time scales similarly small to the time scale that determines perceived QoS. It is well-known that variability of link load on small time scales (e.g., 10 milliseconds) is larger than on large time scales (e.g., 5 minutes). Few quantitative figures are known, however, about the magnitude of the differences between fine and coarse-grained measurements. The novel aspect of this paper is that it quantifies the differences in measured link load on small and large time scales. The paper describes two case studies. One of the surprising results is that, even for a network with 2000 users, the difference between short-term and long-term average load can be more than 100%. This leads to the conclusion that, in order to prevent congestion, it may not be sufficient to use the 5 minute MRTG maximum and add a small safety margin.
Original languageEnglish
Title of host publicationSelf-Managing Distributed Systems
Subtitle of host publication14th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management, DSOM 2003
EditorsMarcus Brunner
PublisherSpringer
Pages106-117
Number of pages12
ISBN (Electronic)978-3-540-39671-0
ISBN (Print)978-3-540-20314-8
DOIs
Publication statusPublished - Oct 2003
Event14th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management, DSOM 2003 - Heidelberg, Germany
Duration: 20 Oct 200322 Oct 2003
Conference number: 14

Publication series

NameLecture notes in computer science
Volume2867

Workshop

Workshop14th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management, DSOM 2003
Abbreviated titleDSOM
CountryGermany
CityHeidelberg
Period20/10/0322/10/03

Keywords

  • IR-63486
  • EWI-7140

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    Brunner, M. (Ed.), van de Meent, R., Pras, A., Keller, A. (Ed.), Mandjes, M. R. H., van den Berg, H. L., & Nieuwenhuis, L. J. M. (2003). Traffic Measurements for Link Dimensioning: A Case Study. In M. Brunner (Ed.), Self-Managing Distributed Systems: 14th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management, DSOM 2003 (pp. 106-117). (Lecture notes in computer science; Vol. 2867). Springer. https://doi.org/10.1007/978-3-540-39671-0_10