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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editor: Keren Bergman
  • Vol. 7, Iss. 5 — May. 1, 2008
  • pp: 388–399

Impact of routing and wavelength selection strategies on GMPLS-controlled distributed restoration

Nicola Sambo, Isabella Cerutti, Alessio Giorgetti, and Piero Castoldi  »View Author Affiliations


Journal of Optical Networking, Vol. 7, Issue 5, pp. 388-399 (2008)
http://dx.doi.org/10.1364/JON.7.000388


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Abstract

The restorability problem in wavelength-routed networks without wavelength converters is investigated. A distributed control plane based on the generalized multiprotocol label switching (GMPLS) suite is considered for disseminating link-state information and reserving network resources. Different routing and wavelength selection strategies are proposed and a detailed performance analysis is carried out during restoration. Simulation results evaluate the blocking probability due to both lack of available resources (i.e., forward blocking) and resource contentions (i.e., backward blocking). Performance comparison provides some insightful suggestions to be applied to GMPLS-controlled wavelength-routed networks without wavelength converters. First, it is recommended to perform routing and wavelength selection separately at the lightpath source and destination, respectively. Second, routing can be computed on link-state information advertised during provisioning, without the need of flooding link-state information during restoration. In fact, during restoration, the resource contention among concurrent signaling instances is the dominant cause of blocking (i.e., backward blocking overcomes forward blocking). For this reason, intelligent routing and wavelength selection strategies aiming at avoiding or limiting resource contentions can help to improve restorability. In particular, among those strategies, the proposed wavelength selection has a better ability to reduce resource contentions than the routing strategies.

© 2008 Optical Society of America

OCIS Codes
(060.4251) Fiber optics and optical communications : Networks, assignment and routing algorithms
(060.4257) Fiber optics and optical communications : Networks, network survivability

ToC Category:
Reliability Issues in Optical Networks

History
Original Manuscript: February 22, 2008
Manuscript Accepted: March 4, 2008
Published: April 4, 2008

Virtual Issues
Reliability Issues in Optical Networks (2008) Journal of Optical Networking

Citation
Nicola Sambo, Isabella Cerutti, Alessio Giorgetti, and Piero Castoldi, "Impact of routing and wavelength selection strategies on GMPLS-controlled distributed restoration," J. Opt. Netw. 7, 388-399 (2008)
http://www.opticsinfobase.org/jocn/abstract.cfm?URI=jon-7-5-388

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