Dual failure protection in multilayer networks based on overlay or augmented model

In this paper we present and compare different multilayer protection mechanisms which enable the client to protect its connections against dual failures in the server layer. In multilayer networks based on overlay or augmented model, the client is not aware of the routing information of the server layer. Therefore, some resilience mechanisms need new functions that have to be provided by the User Network Interface (UNI). Based on generic building blocks for surviving dual failures we propose four multilayer protection models. We extend our existing simulation software for analyzing resilience options and evaluate the selected operation scenarios.