Differentiated Resilience in IP-Based Multilayer Transport Networks

This thesis investigates the provisioning of resilience against network failures in multilayer IP-based optical networks. To investigate and evaluate existing and novel resilience strategies a comprehensive and systematic resilience framework is defined. A key contribution of this thesis is the development of a novel architecture for the flexible provisioning of differentiated resilience in quality-of-service-enabled IP networks. Services or flows can be assigned different levels of resilience depending on their resilience requirements. This is achieved by an extension of the traditional QoS signaling to include resilience requirements of the services. The architecture is called Resilience-Differentiated QoS (RD-QoS). In addition, the thesis evaluates the multilayer resilience strategies identified in the recovery framework. Finally, the differentiated multilayer resilience approach considers the resilience requirements of the IP services and the recovery mechanisms available in different layers to select an optimal multilayer recovery strategy. The different options of this approach are discussed and their performance is evaluated in this thesis.