Patent ID: 8750134

Claim:
A communication network management system, comprising: a communication network including a plurality of nodes and a plurality of links connecting between said plurality of nodes; and a management computer configured to manage said communication network, wherein said management computer comprises: a storage unit in which route information indicating a transfer route of frames in said communication network is stored; and a monitoring unit configured to refer to said route information to transmit a frame to said transfer route and to perform identification processing that identifies a location of a failure on said transfer route, wherein first to N-th nodes (N is an integer equal to or more than 3) line up in order along said transfer route, wherein an i-th node (i=1 to N−1) forwards a received frame to an (i+1)-th node, and the N-th node forwards a received frame to said management computer, wherein, in said identification processing, said monitoring unit sets at least one node between the first node and the N-th node as an insertion node, transmits a check frame to said insertion node, and identifies the location of the failure based on a reception state of a frame from the N-th node, wherein, in said identification processing, said monitoring unit initially sets the first node and the N-th node as a range start node and a range end node, respectively, and said monitoring unit sets an intermediate node between said range start node and said range end node as said insertion node, wherein, if said monitoring unit receives a frame from the N-th node, said monitoring unit newly sets said intermediate node as said range end node, wherein, if said monitoring unit fails to receive a frame from the N-th node, said monitoring unit newly sets said intermediate node as said range start node, and wherein, if there is no node between said range start node and said range end node, said monitoring unit determines that said failure is occurring between said range start node and said range end node.