Inter-domain QoS routing on Diffserv networks: A region-based approach

Ibrahim T. Okumus, Haci A. Mantar, Junseok Hwang, Steve J. Chapin

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Quality of Service (QoS) routing is inherently a difficult problem. Inter-domain QoS routing is even harder, because it involves entities residing in distinct administrative domains. There are two problems that need to be solved in inter-domain QoS routing: topology distribution in a scalable fashion and finding paths that satisfy QoS constraints and provide connectivity. In this paper we present region-based, link-state, source-specified, inter-domain QoS routing architecture that addresses these questions. Our architecture is scalable and does not suffer from the problems caused by hierarchical routing. Analysis results show that the average region size and the average shortest path length (SPL) are inversely proportional and scalability of the approach increases as the region size decreases. Gain from the scalability is far more than the loss from the average SPL, especially with larger topologies.

Original languageEnglish (US)
Pages (from-to)174-188
Number of pages15
JournalComputer Communications
Issue number2
StatePublished - Feb 10 2005


  • Bandwidth brokers
  • Diffserv
  • QoS routing
  • Traffic engineering

ASJC Scopus subject areas

  • Computer Networks and Communications


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