A Novel Heuristic Method Based on Shared-Risk Link Groups (SRLG) Constraints in WDM Optical Networks

This paper proposes a novel survivable algorithm, called backup shared and trap avoidance (BSTA), to protect the single failure of shared-risk link groups (SRLG) in WDM optical networks. For each connection request, BSTA computes one primary path and one SRLG-disjoint backup path, or one primary path and two SRLG-disjoint segment-backup paths. With respect to the previous algorithm, BSTA can obtain better performances. Simulation results are shown to be promising.