Patent ID: 8456995

Claim:
A packet transport system, comprising: a plurality of edge nodes respectively accommodating access networks; a plurality of packet transfer nodes connecting the plurality of edge nodes; and a network management apparatus connecting the plurality of edge nodes and the plurality of packet transfer nodes, wherein: the plurality of edge nodes and the plurality of packet transfer nodes transmit and discard frames according to transfer priorities, each of the edge nodes is configured to: set a transfer priority to a frame flowing in from the access network in accordance with a transfer priority setting policy, wherein a respective transfer priority setting policy is set for each path, and transmit the frame with the set transfer priority to one of the packet transfer nodes, and the network management apparatus: receives a piece of statistical information from the packet transfer node, detects a congested state of the packet transfer node by analyzing the piece of statistical information, selects a path for which the setting transfer priority is to be changed from a plurality of paths accommodated in the packet transfer node in congestion based on path priorities of the plurality of paths, specifies one of the plurality of edge nodes to set the transfer priority to the selected path, and transmits a transfer priority setting policy changing request to the specified edge node, wherein the transfer priority setting policy changing request includes a path identifier to identify the selected path, and the specified edge node changes the transfer priority setting policy of the path corresponding to the path identifier based on the transfer priority setting policy changing request.