Protection Coordination for Dual Failure on Two-Layer Networks

Network layers such as IP/MPLS and OTN/ASON each has its own failure protection scheme. We propose a coordinated protection plan, so called protection synergy, to protect all possible dual failures by utilizing existing single failure protection schemes. There are two aspects essential for effective dual failure protection: One is to guarantee the connectivity under any dual fiber failures, the other is to allocate minimum but enough spare capacity on both layers. Our model achieves both goals using a novel topology mapping technique and computing working and backup paths with an accurate path disjoint criterion. The experimental results on four networks demonstrate complete dual failure restorability and spare capacity savings of the protection synergy approach.