On the Design of Fault-Tolerant Logical Topologies in Wavelength-RoutedNetworks supporting Packet Datagrams

In this paper we present a new methodology for the design of fault-tolerant logical topologies in wavelength- routed optical networks supporting IP datagram flows. Our design approach generalizes the "design protection" con- cepts, and relies on the dynamic capabilities of IP to re- route datagrams when faults occur, thus achieving protec- tion and restoration, and leading to high-performance cost- effective fault-tolerant logical topologies. In this paper for the first time we consider resilience properties during the logical topology optimization process, thus extending the op- timization of the network resilience also to the space of log- ical topologies. Numerical results clearly show that our ap- proach outperforms previous ones, being able to obtain very effective survivable logical topologies with limited computa- tional complexity.