Comprehensive Performance Study of Active Restoration-Based Optical Networks under Dual-Failure Attacks

Optical networks, based on the emergence of the optical layer in transport networks, provide higher capacity and reduced costs for new network applications such as the VoIP, video on demand, and advanced digital services. With the increasing demand for network bandwidth, optical network survivability has become a critical issue in such high capacity networks. A significant finding is that designs offering complete dual-failure restorability require almost triple the amount of spare capacity. Active Restoration Scheme is an efficient restoration scheme proposed recently. In (Mohamed Mostafa A. Azim, et al., 2005) we compare the dual-failure restorability of the path-based protection (PBP) scheme to that of the AR. In this paper we extend our study on the performance of AR when considering single-failure and dual-failure attacks. In particular, we present the blocking behavior as well as the restoration behavior of AR-based optical networks. Extensive simulation results on two typical test networks show that, on the average, AR scheme achieves lower blocking probability as well as better restoration probability compared to PBP scheme when considering single and dual like failures attacks