Qualité de Service dans les Réseaux Actifs

Transcription

1 LABORATOIRE D INFORMATIQUE DE L UNIVERSITE DE FRANCHE-COMTE Qualité de Service dans les Réseaux Actifs David FUIN Eric GARCIA Hervé GUYENNET Rapport de Recherche n RR THÈME FRE CNRS 2661

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3 Qualité de Service dans les Réseaux Actifs David FUIN, Eric GARCIA, Hervé GUYENNET Thème 1 Distribution et Parallélisme 2004 La qualité de service dans les réseaux est enjeu majeur. Les réseaux actifs, qui sont des réseaux très ouverts, ont également besoin de mécanismes permettant d avoir un contrôle sur les effets de la congestion. Dans cette optique, beaucoup de travaux ont été réalisés que l on peut classer en deux catégories. La première utilise des services actifs adaptés au contenu des flux et adapte la distribution des paquets en fonction de la congestion (par exemple, en détruisant les paquets les moins importants en cas de congestion) mais ne permet de différencier la priorité des flux. La seconde réutilise les mécanismes de QoS fournis pas la couche réseau sous-jacente (classiquement la couche IP) et permet donc cette différenciation. Qualité de Service, Réseaux Actifs Laboratoire d Informatique de l Université de Franche-Comté, UFR Sciences et Techniques, 16, route de Gray, Besançon Cedex (France) Téléphone : +33 (0) Télécopie : +33 (0)

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5 Quality of Service in Active Networks Quality of service in networks is a major issue. Active networks, which are very open networks, also require mechanisms allowing us to reduce congestion effects. Consequently, many works were realized, we classify them in two categories. The first one uses active services specific to flows content and adapt packets forwarding according to congestion (for example, by destroying less significant packets in case of congestion) but does not allow to differentiate flows priority. The second one re-uses QoS mechanisms provided by the subjacent network layer (classically IP layer) and thus allows this differentiation. Quality of Service, Active Networks Laboratoire d Informatique de l Université de Franche-Comté, UFR Sciences et Techniques, 16, route de Gray, Besançon Cedex (France) Téléphone : +33 (0) Télécopie : +33 (0)

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