Alternate Strategies for Dual Failure Restoration Using p-Cycles

We propose a two-step method to enhance the dual-failure restorability in p-cycle protected mesh networks that are optimally designed to withstand only single failures. Our two-step method relies on finding alternate routes to repair the non functional p-cycles upon the first failure and protect the exposed spans. We then compare our proposed method with the cycle reconfiguration method proposed in [9] in which the spare capacity is reconfigured dynamically (either incrementally or completely) after the first failure. We find out the additional spare capacity required for dual failure restorability as compared to single failure restorability for our proposed method as well as the incremental and complete cycle reconfiguration methods. We conclude our findings based on our results and discuss the advantages and disadvantages of each of these methods.