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A New Shared-Path Restoration Algorithm with SRLG Constraint in ASON

In order to enhance the survivability of ASON, ASON must provide efficient recovery techniques to guarantee service continuity. This paper proposed a new path restoration algorithm with SRLG constraint to handle single-link failures in GMPLS-Based ASON (RSGA), whose restoration paths are pre-computed and stored in the routing table at each node. This algorithm can efficiently find physically disjoint Label Switched Paths (LSP) with SRLG. The numerical simulations show the RSGA can significantly improve resource utilization, and reduce blocking ratio.