Group-failure based cross-layer survivability research in intelligent optical networks

Different from general multi-failure, group-failure in cross-layer intelligent optical networks has the characteristic of cluster. Because multi-failure may occur due to single failure, it is more harmful for multi-failure than single failure. The original survivability with regards to multiple single failures is not suitable for group-failure based cross-layer survivability research. Group-failure based cross-layer survivability is eager to be solved in intelligent optical networks, and the corresponding key theory and technology are anxious to be proposed. This paper mainly focuses on the performance of cross-layer survivability based on group-failure in intelligent optical networks. Three topics are mainly paid attentions to, including the generation mechanism and model of group-failure in multi-layer optical networks, fast location mechanism for group-failure, and protection and recovery strategies applied to group-failure. At last, a PCE-based fast reroute algorithm (PFRR) is proposed and analyzed in the paper.