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Quality-of-service mechanisms in IP-over-WDM networks

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4 Author(s)
Kaheel, A. ; British Columbia Univ., Vancouver, BC, Canada ; Khattab, T. ; Mohamed, A. ; Alnuweiri, H.

Classical approaches to QoS provisioning in IP networks are difficult to apply in all-optical networks. This is mainly because there is no optical counterpart to the store-and-forward model that mandates the use of buffers for queuing packets during contention for bandwidth in electronic packet switches. Since plain IP assumes a best effort service model, there is a need to devise mechanisms for QoS provisioning in IP over wavelength-division multiplexing networks. Such mechanisms must consider the physical characteristics and limitations of the optical domain. This article presents a classification and survey of proposals for QoS provisioning and enforcement in IP-over-WDM networks. The different QoS proposals surveyed cover three major optical switching methods: wavelength routing, optical packet switching, and optical burst switching.

Published in:

Communications Magazine, IEEE  (Volume:40 ,  Issue: 12 )

Date of Publication:

Dec 2002

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