Remove trouble path search manner and the remove trouble path search program null node in

摘要

PROBLEM TO BE SOLVED: To minimize the range for performing failure restoration control when switching is made to a substitute path at the failure end.;SOLUTION: When a preliminary path is calculated for failure restoration, an alternative path is calculated by providing a value larger than the sum of weight of all links existing in a communication network except th links of the relevant communication network for the calculation of a currently used objective section [m, m+1]. If the calculation results share the currently used path with other section, the overlapping part is removed to obtain a preliminary path of a section including the objective section [m, m+1].;COPYRIGHT: (C)2005,JPO&NCIPI