Computation of high availability connections in multidomain IP-over-WDM networks

Carrier networks are gradually adopting a network model that consists of MPLS capable routers and OXCs interconnected by high bandwidth WDM links for transporting IP and Ethernet traffic. Globalization drives the quest for end-to-end QoS guarantees over different carrier networks. Recovery mechanisms are crucial to reach the high availability requirements of critical services. In this paper we investigate how to enable high availability services spanning multiple networks, using failure protection techniques, whilst obeying administrative constraints. We show how different multidomain schemes compare in terms of availability. A constructive proof is given of the applicability of our approach, which leads to a heuristic solution. We compare this heuristic solution to an ILP model.