Connection Management for Survivable Wavelength-Routed Networks

Abstract

In Chapter 4, we investigated several protection schemes in wavelengthrouted WDM networks from the routing and wavelength-assignment perspective. We observed that shared-path protection is more resource-efficient compared to shared-link protection. Theoretically, shared-link protection is more resource-efficient than dedicated-path protection. However, given that the optimal routing problem, which can be formulated as a multicommodity flow problem, is NP-complete [28], it is hard to find a good heuristic. In this chapter, we devote our study to path-based protection schemes from the connection management standpoint. Although our discussion is focused on path-protection schemes, most techniques described in the chapter are also applicable to networks employing other protection schemes, such as dedicated-link protection, shared-link protection, sub-path protection [74], and short-leap-shared protection (SLSP) [75], etc.