A novel heuristic for overlay mapping with enhanced resilience and QoS

The problem of overlay mapping with enhanced resilience and QoS is NP-hard and previous heuristics are oblivious to substrate topology information and thus cannot provide effective protection. This is because diversity of the working and backup paths is essential to ensure resilience since a single link failure in the lower layer can result in failures of all the upper-layer links that go through it for applications involving multiple layers. In this paper, a novel and effective heuristic that considers the substrate network topology information is proposed. The effectiveness of the new heuristic is verified through extensive simulations. As confirmed by the evaluation, the proposed heuristic can ensure that physical paths are diversified though additional substrate nodes are involved in the overlay mapping solution. Moreover, the robustness of the proposed heuristic with incomplete substrate network information is also examined.