Summary :
In step 7, the algorithm reconsiders the shortest path found in step 1 instead of the one found in step 4 in order to decrease the load on links with high reliability, which would be preferentially chosen by the modified path selection algorithm. Selection of wavelength along the route chosen (primary, partial, or end-to-end backup) Although the algorithm establishes only one backup lightpath, it can be easily adapted to establish multiple backup lightpaths to further enhance the reliability of an R-connection.