Performance oaf Survivable Lightpath Provisioning Scheme in Multi-Domain Optical Networks

摘要

This paper evaluates a survivable lightpath provisioning scheme that allows traffic splitting in multi-domain optical networks to minimize the cumulative cost of a set of paths. This scheme, called two-phase lightpath provisioning, employs an integer linear programming (ILP) formulation based on hierarchical path computation with full-mesh topology abstration. Three different protection strategies are considered with varying degrees of primary and backup route separation. Furthermore, to support various types of traffic demands, we investigate two cases in terms of the number of requested wavelengths. The scheme well supports the implementation of heuristic algorithms for lightpath provisioning since it can provide reference values, including upper and lower bounds, that are useful as benchmarks.