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Proceedings Paper

DiffServ experiments: evaluation of some approaches to quality of service control over the Alcatel-NCSU Internet2 testbed
Author(s): Aziz Mohammed; Mladen A. Vouk; Emanuele Jones; Zyad Dwekat
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Paper Abstract

Technological communities that are formed on the basis university, industry and government partnerships are developing and deploying advanced network applications and technologies, accelerating the creation of tomorrow's Internet. Alcatel and North Carolina State University (NCSU) have jointly launched a virtual Lab between Alcatel's Research & Innovation Center in Plano, TX and NCSU campus at Raleigh, NC across the Internet2 national backbone network. The objective of this co-operative work is to conduct a large-scale field trial in the currently deployed state of the art QoS technologies and investigate areas of improvement. Results from phase one of our work in a Differentiated services (DiffServ) experiments over this testbed involving network equipment from Alcatel and other third party vendors show that DiffServ is capable of delivering the premium service using its expedited forwarding (EF) per-hop behaviour (PHB) for a large class of bandwidth starving applications. However, it is found that DiffServ needs some additional mechanisms to efficiently deliver similar services for jitters and delay sensitive applications, especially in a condition of severely congested network. The situation is even more complicated when one considers resource-sharing environments beyond the extreme cases of EF and best effort (BE) only. The second phase of our work involves investigating empirically and through simulation, a fine-grained new integrated scheduling scheme to extend the DiffServ with a variety of adaptive queue management (AQM) solutions and study their effect on end-to-end (e2e) DiffServ experiments involving not only EF/BE but also assured forwarding (AF) traffic.

Paper Details

Date Published: 1 July 2002
PDF: 12 pages
Proc. SPIE 4866, Quality of Service over Next-Generation Internet, (1 July 2002); doi: 10.1117/12.473020
Show Author Affiliations
Aziz Mohammed, Alcatel Research and Innovation Ctr. (United States)
Mladen A. Vouk, North Carolina State Univ. (United States)
Emanuele Jones, Alcatel Research and Innovation Ctr. (United States)
Zyad Dwekat, North Carolina State Univ. (United States)


Published in SPIE Proceedings Vol. 4866:
Quality of Service over Next-Generation Internet
Mohammed Atiquzzaman; Mahbub Hassan, Editor(s)

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