Advertisement

Towards Provisioning Diffserv Intra-Nets

  • Ulrich Fiedler
  • Polly Huang
  • Bernhard Plattner
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2092)

Abstract

The question of our study is how to provision a diffserv (differentiated service) intra-net serving three classes of traffic, i.e., voice, real-time data (e.g. stock quotes), and best-effort data. Each class of traffic requires a different level of QoS (Quality of Service) guarantee. For VoIP the primary QoS requirements are delay and loss; for realtime data response-time. Given a network configuration and anticipated workload of a business intra-net, we use ns-2 simulations to determine the minimum capacity requirements that dominate total cost of the intranet. To ensure that it is worthwhile converging different traffic classes or deploying diffserv, we cautiously examine capacity requirements in three sets of experiments: three traffic classes in i) three dedicated networks, ii) one network without diffserv support , and iii) one network with diffserv support. We find that for the business intra-net of our study, integration without diffserv may need considerable over-provisioning depending on the fraction of real-time data in the network. In addition, we observe significant capacity savings in the diffserv case; thus conclude that deploying diffserv is advantageous. The relations we find give rise to, as far as we know, the first rule of thumb on provisioning a diffserv network for increasing real-time data.

Keywords

Link Capacity Queue Size Capacity Requirement Bottleneck Link Expedite Forwarding 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    A. M. Odlyzko, “;The internet and other networks: Utilization rates and their implications,” Information Economics and Policy, vol. 12, pp. 341–365, 2000.CrossRefGoogle Scholar
  2. 2.
    S. Bajaj et. al., “;Is service priority useful in networks?,” in Proceedings of the ACM Sigmetrics’ 98, Madison, Wisconsin USA, June 1998.Google Scholar
  3. 3.
    G. Kim et. al., “;Qos provisioning for voip in bandwidth broker architecture: A simulation approach,” in Proceedings of the communication networks and distributed systems modeling and simulation conference (CNDS)’01, Phoenix, Arizona, USA, Jan. 2001.Google Scholar
  4. 4.
    L. Breslau et. al., “;Advances in network simulations,” IEEE Computer, May 2000.Google Scholar
  5. 5.
    S. Murphy, “;Diffserv package for ns-2,” available at http://www.teltec.dcu.ie/~murphys/ns-work/diffserv/index.html.
  6. 6.
    R. Fielding et. al., “;Hypertext transfer protocol-http/1.1,” RFC 2616, Internet Request For Comments, June 1999.Google Scholar
  7. 7.
    S. Blake et. al., “;An architecture for differentiated services,” RFC 2475, Internet Request For Comments, Dec. 1998.Google Scholar
  8. 8.
    J. Wroclaski D. Clark, “;An approach to service allocation in the internet,” IETF Draft, July 1997.Google Scholar
  9. 9.
    L. Zhang K. Nichols, V. Jacobson, “;A two-bit differentiated services architecture for the internet,” IETF Draft, Apr. 1999.Google Scholar
  10. 10.
    V. Jacobson et. al., “;An Expedited Forwarding PHB,” RFC 2598, Internet Request For Comments, June 1999.Google Scholar
  11. 11.
    A. Charny J. Wroclawski, “;Integrated service mappings for differentiated services networks,” IETF Draft, Feb. 2001.Google Scholar
  12. 12.
    S. Shenker et al., “;Specification of guaranteed quality of service,” RFC 2212, Internet Request For Comments, Sept. 1997.Google Scholar
  13. 13.
    J. Heinanen et. al., “;Assured Forwarding PHB Group,” RFC 2597, Internet Request For Comments, June 1999.Google Scholar
  14. 14.
    J. Wroclawski, “;Specification of the controlled-load network element service,” RFC2211, Internet Request For Comments, Sept. 1997.Google Scholar
  15. 15.
    Siemens, Telephone traffic theory tables and charts, Siemens Aktiengesellschaft, Berlin-Muenchen, Germany, 1981, 3rd edition.Google Scholar
  16. 16.
    M. Dasen, “;Up-to-date information in web accessible information resources,” Ph.d. thesis-tik-schriftenreihe nr. 42, ETH Zurich, June 2001.Google Scholar
  17. 17.
    P. Barford et. al., “;Changes in web client access patterns: Characteristics and caching implications,” World Wide Web, Special Issue on Characterization and Performance Evaluation, vol. 2, no. 2, pp. 15–28, 1999.Google Scholar
  18. 18.
    P. Barford and M. E. Crovella, “;Generating representative web workloads for network and server performance evaluation,” in Proc. of Performance’98/ACM SIGMETRICS’98, 1997.Google Scholar
  19. 19.
    R. Steinmetz and K. Nahrstedt, Multimedia: Computing, Communications & Applications, Prentice-Hall, 1995.Google Scholar
  20. 20.
    International Telecommunication Union Telecom Standardization Sector, “;Itut g.711-pulse code modulation pcm of voice frequencies,” available at http://www.itu.int, Nov. 1988.
  21. 21.
    V. Paxson, “;End-to-end internet packet dynamics,” IEEE/ACM Transactions on Networking, vol. 7, no. 3, pp. 277–292, June 1999.CrossRefGoogle Scholar
  22. 22.
    C. P artridge, “;Weighted fair queueing,” in Gigabit Networking. 1994, p. 276, Addison-Wesley Publishing.Google Scholar
  23. 23.
    Faloutsos et. al., “;On power-law relationships of the internet topology,” in Proceedings of ACM SIGCOMM, Stockholm, Sweden, Aug. 1999.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Ulrich Fiedler
    • 1
  • Polly Huang
    • 1
  • Bernhard Plattner
    • 1
  1. 1.Compute Engineering and Networks LaboratorySwiss Federal Institute of Technology ETH-ZentrumZurichSwitzerland

Personalised recommendations