Inter-domain routing technique using MPLS

摘要

This invention is to enable inter-domain routing using MPLS. When communication is carried out passing through plural domains, respective management servers managing respective domains cooperate to carry out path constitution and optimum routing. At the path constitution, the respective management servers connect links within the respective controlling domain to constitute paths to reach a target address. When the paths are constituted, label data is notified to nodes associated with the constituted paths, and is used at the routing. At the routing, the management server controlling the source domain obtains the dynamic transmission bandwidths from the respective management servers, and identifies the routing policy from a port number of a request to be routed or the like to identify the optimum path. When the optimum path is determined, it is possible to carry out the routing using the label data held in the respective nodes.