Multicast protection scheme in survivable WDM optical networks

Authors:
Luhua Liao;Lemin Li;Sheng Wang
Affiliations:
School of Communication and Information Engineering, University of Electronic Science and Technology of China, No. 4, Section 2, North Jianshe Road, UESTC, Chengdu 610054, PR China;School of Communication and Information Engineering, University of Electronic Science and Technology of China, No. 4, Section 2, North Jianshe Road, UESTC, Chengdu 610054, PR China;School of Communication and Information Engineering, University of Electronic Science and Technology of China, No. 4, Section 2, North Jianshe Road, UESTC, Chengdu 610054, PR China
Venue:
Journal of Network and Computer Applications
Year:
2008

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Abstract

The protection design is a key issue in survivable wavelength division multiplexing (WDM) optical networks. Most researches focused on protecting unicast traffic against the failure of a single network component such as a link or a node. In this paper, we investigate the protection scheme for multicast traffic in meshed WDM optical networks under dual-link failure consideration, and propose a novel protection algorithm called shared segment protection with reprovisioning (SSPR). Through dynamically adjusting link-cost according to the current network state, SSPR establishes a primary light-tree and corresponding link-disjoint backup segments for each multicast connection request. A backup segment can efficiently share wavelength capacity of its working tree or the common resource of other backup segments. Capacity reprovisioning establishes new segments for the vulnerable connections after a link failure and tolerates following link failures. The simulation results show that SSPR not only can make good use of wavelength resources and protect multicast sessions against any single-link failure, but also can greatly improve the traffic restorability in the event of dual-link breakdown.