NETWORK OPERATION METHOD, REQUEST ROUTING METHOD, AND METHOD FOR ROUTING AND APPROVAL CONTROL

摘要

PROBLEM TO BE SOLVED: To conduct routing and approval control to increase utilization of a network resource in an exchange virtual circuit(VC) network having no intelligence of consecutive time. SOLUTION: In the method for approving and routing a request of an exchange VC channel in this network 106, at first a path group consisting of paths for a VC on request is searched by using two steps as follows. Possible paths for the VC at a cost below a threshold cost are decided by using a cost function based on a parameter relating to the hop number of a subset in preceding VC connection. Then which potential routing paths consisting of links 110 and nodes 108 having a sufficient resource to meet the request are checked. Paths satisfying both the steps above are outputted as a path group and a path meeting the requirement is selected from the path group by using a 2nd criterion.