An efficient scheme for two-link failure protection/restoration in WDM mesh networks

Article type: Research Article

Authors: Ruan, Lu^; | Xiao, Nan

Affiliations: Department of Computer Science, Iowa State University, Ames, IA, USA

Note: [] Corresponding author: Lu Ruan, Department of Computer Science, Iowa State University, 226 Atanasoff Hall, Ames, IA 50011, USA. E-mail: ruanlu@iastate.edu.

Abstract: In this paper, we present a new hybrid protection and restoration scheme to handle two-link failure in WDM mesh networks. Some existing schemes for handling two-link failure use two backup paths to protect each demand or each link. Others reprovision backup paths for affected demands after the first link failure. Our hybrid scheme is more capacity efficient than previous schemes while being able to protect most of the demands upon two-link failure. The protection component of our hybrid scheme reserves backup capacity intelligently to ensure the majority of the affected demands can be restored using pre-planned backup paths upon two-link failure. For the rest of the affected demands, the restoration component of our hybrid scheme dynamically finds new backup paths to quickly restore them. The capacity efficiency and protection/restoration capability of our hybrid scheme are demonstrated through numerical results.

Keywords: Protection, restoration, two-link failure, WDM mesh networks

DOI: 10.3233/JHS-2012-0454

Journal: Journal of High Speed Networks, vol. 18, no. 3, pp. 185-195, 2012