Communication network, path setting method and recording medium having path setting program recorded thereon

A recording medium storing a path setting program for controlling a node in a communication network comprising a plurality of nodes constituting a network,

• wherein each of said nodes has topology information of said network, information on a risk sharing resource group, and information on a currently set path passing the node itself, and said path setting program comprises:
• a first set of instructions in which a source node refers to said topology information of the network and said information on the risk sharing resource group to calculate routes of a first path and a second path so as not to pass the same risk sharing resource group;
• and
• a second set of instructions in which each node on said routes receives a signal from an upstream node, refers to said information on the risk sharing resource group and said information on the currently set path passing the node itself to detect a second path having an overlapping route in a link group between the node itself and a downstream node and compare said risk sharing resource groups of said first path.