Redundant Protection Problem in the Hierarchical GMPLS Networks

The generalized multiprotocol label switching (GMPLS) networks possess a hierarchical structure, and each layer has its own independent protection mechanism. Thus, there is redundant protection due to the survivability mechanism at each layer. Among many proposed solutions on the redundant protection problem, the common pool method is considered as the most representative one. However, the common pool method cannot cope with two link failures. With a proposed method, the common pool method can be extended to cope with two link failures with a small cost