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Rerouting is a viable and cost-effective approach to decrease the blocking probability in legacy circuit-switched networks. The authors study lightpath rerouting in optical WDM networks in this paper. First, they investigate two different lightpath rerouting strategies, namely, passive rerouting and intentional rerouting. Passive rerouting means the rerouting of existing lightpaths to accommodate new lightpath requests which will otherwise be blocked. Intentional rerouting is to intentionally reroute existing lightpaths during their life period so as to achieve a better load balancing. Second, they investigate the hybrid rerouting scheme which combines passive rerouting and intentional rerouting.
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