A large-size optical network will carry different classes of traffic. Several previous papers suggest a priority-based
routing scheme. The key property of this scheme is that low priority traffic's working paths can share resources with
high priority traffic's backup paths. They have proposed Integer Linear Programming (ILP) formulations to implement
this routing scheme and optimize network resource. However, they did not propose the detailed heuristic algorithm for
priority-based lightpath allocation. In this paper, we describe the detailed heuristic algorithm, Level of Service Algorithm
(LSA). Furthermore, since low priority traffic can share resource with high priority lightpath's backup path, we proposed
an Enhanced Resource Shared Algorithm (ERSA). Simulations show that it has good performance in resource utilization
ratio and blocking probability.
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