Multi-layer survivability in IP-over-WDM networks

Abstract

Multi-layer survivability has the capability of incorporating the best features of single layer survivability approaches, and providing differentiated survivability services. In this thesis, we propose multi-layer survivability approaches, including differentiated survivability, for dynamic connections to satisfy fault-tolerance related operational, control, and performance aspects with the focus on resource-usage based inter-working mechanisms for IP/MPLS-over-WDM networks. We first develop a protection strategy based on a new concept of dynamic heavily loaded lightpath protection to achieve an acceptable tradeoff between signaling overhead and blocking performance. An adaptive protection method is proposed to provide efficient fault tolerance capability. We then propose solution-approaches based on an inter-class backup resource sharing technique, differentiated routing scheme, and rerouting schemes to address a fairness problem inherent in provisioning multi-layer protection based differentiated survivability. Finally, we devise a framework of multi-layer protection methods with various resource sharing mechanisms, and propose a graph based network model to support heterogeneity in a network and the coexistence of the protection methods. We conduct extensive simulation experiments and verify the effectiveness of the proposals.