Label Preference Schemes for Lightpath Provisioning and Restoration in Distributed GMPLS Networks

In wavelength-routed networks based on a GMPLS control plane, the resource reservation protocol with traffic engineering extensions (RSVP-TE) allows to establish end-to-end lightpaths. The resource reservation can be blocked due to lack of available resources (forward blocking) or due to resource co...

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Bibliographic Details
Published in:Journal of lightwave technology 2009-03, Vol.27 (6), p.688-697
Main Authors: Giorgetti, A., Sambo, N., Cerutti, I., Andriolli, N., Castoldi, P.
Format: Article
Language:English
Subjects:
Access methods and protocols, osi model
Algorithms
Applied sciences
Availability
Backward blocking
Communication system traffic control
Computer networks
Distributed control
dynamic restoration
Exact sciences and technology
forward blocking
GMPLS control plane
Labels
Lighting control
Messages
Networks
Optical fiber networks
Optical interconnections
Protocols
Provisioning
Restoration
RSVP-TE
Signal restoration
Switching and signalling
Systems, networks and services of telecommunications
Telecommunication traffic
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Teletraffic
Traffic control
Traffic engineering
Wavelength division multiplexing
wavelength-routed networks
Wavelengths
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Summary:In wavelength-routed networks based on a GMPLS control plane, the resource reservation protocol with traffic engineering extensions (RSVP-TE) allows to establish end-to-end lightpaths. The resource reservation can be blocked due to lack of available resources (forward blocking) or due to resource contentions (backward blocking). In wavelength-routed networks, the backward blocking is the predominant blocking contribution, when traffic load is low or highly-dynamic and when lightpath restoration takes place. To reduce the backward blocking, the paper proposes two label preference (LP) schemes compliant with RSVP-TE message exchanges. LP schemes provide the destination node with a label identifying the preferred wavelength to reserve. The preferred label is computed in a distributed way during the forward signaling phase, with the objective of assigning disjoint wavelengths to reservation attempts that may contend the resources. Simulation results demonstrate that, compared to other schemes, LP schemes are effective in reducing the backward blocking during both lightpath provisioning and restoration, without negatively impacting the forward blocking.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2008.917380