Resilience in multilayer networks

The integration of different technologies such as ATM, SDH, and WDM in mult ilayer transport networks raises many questions regarding the coordination of the individual network layers. Especially in the area of network surviva bility, much can be gained by a better alignment of the healing actions tak en by different network layers in case of outages. Survivability issues enc ountered in a multilayer environment include, among others: how to identify the original failure cause, how to appoint for each failure a layer respon sible for its healing, how to let different layers interwork, and how to pr ovide spare resources in an efficient way.