Upper layer node, lower layer node, and node control method

A lower layer node, which is used in a multi-layer network which comprises an upper layer network which performs switching and transfer in units of packets, and a lower layer network which accommodates the upper layer network, and which comprises optical transmission lines and optical switches;

• the lower layer node being provided in a lower layer network which connects between at least two of the upper layer nodes, wherein
• the lower layer node comprising:
• an obstruction restoration section which performs obstruction restoration for the lower layer network;
• a detection section which detects the occurrence of an obstruction upon a transmission line which the lower layer node accommodates;
• and
• an advertisement section which advertises as obstruction information the result of detection by the detection section.

A network control method which is applied to a multi-layer network which comprises an upper layer network which performs switching and transfer in units of packets, and a lower layer network which accommodates the upper layer network, and which comprises optical transmission lines and optical switches;

• and which comprises a plurality of nodes and transmission lines disposed between the plurality of nodes;
• with the plurality of nodes including an upper layer node and a lower layer node, at least two of the upper layer nodes being connected by the lower layer network which comprises a plurality of lower layer nodes and the transmission lines;
• and with the lower layer network being provided with an obstruction restoration process, the network control method comprising the steps of:
• a detection step of the upper layer node and the lower layer node detecting the occurrence of an obstruction upon a transmission line which the upper layer node and the lower layer node accommodate;
• an advertisement step of advertising the result of detection by the detection step as obstruction information;
• a retention step of the upper layer node retaining the topology information for the lower layer network;
• an updating step of the upper layer node updating the topology information which the upper layer node retains, according to obstruction information which has been advertised, or obstruction information which the upper layer node has detected;
• and
• an advertisement transfer step of the upper layer node transferring to other upper layer nodes obstruction information which has been advertised.

An advertisement control device which is used in a multi-layer network which comprises an upper layer network which performs switching and transfer in units of packets, and a lower layer network which accommodates the upper layer network and which comprises optical transmission lines and optical switches;

• the multi-layer network comprising a plurality of nodes, and transmission lines which are provided between the plurality of nodes, with the plurality of nodes including an upper layer node and a lower layer node, and at least two of the upper layer nodes being connected by the lower layer network which comprises a plurality of the lower layer nodes and the transmission lines;
• an obstruction restoration section for the lower layer network being provided to the lower layer node;
• each of the upper layer node and the lower layer node comprising a detection section which detects the occurrence of an obstruction upon a transmission line which each of the upper layer node and the lower layer node accommodates, and a section which advertises the result of detection by the detection section as obstruction information;
• the upper layer node comprising a retention section which retains the topology information for the lower layer network, an updating section which updates the topology information which the upper layer node retains, according to obstruction information which has been advertised, or obstruction information which the upper layer node has detected, and an advertisement transfer section which advertises to other ones of the upper layer nodes obstruction information which has been advertised, and
• wherein the advertisement control device being provided between the upper layer nodes and the lower layer node in the multi-layer network, and performing transfer control of the obstruction information between the lower layer network and the upper layer nodes.

A program, being a network control program which is used for control of a multi-layer network which comprises an upper layer network which performs switching and transfer in units of packets, and a lower layer network which accommodates the upper layer network, and which comprises optical transmission lines and optical switches;

• and
• which, by being installed upon an information processing device, causes the information processing device to implement a function, corresponding to a device which controls an upper layer node or an lower layer node and which is connected to the lower layer network which comprises a plurality of lower layer nodes which comprise obstruction restoration sections, and transmission lines, comprising:
• a detection function of detecting the occurrence of an obstruction upon a transmission line which the upper layer node or the lower layer node accommodates;
• an advertisement function of advertising the result of detection by the detection function as obstruction information;
• a retention function of retaining the topology information for the lower layer network;
• an updating function of updating the topology information which the upper layer node or the lower layer node retains, according to obstruction information which has been advertised, or obstruction information which the upper layer node or the lower layer node has detected;
• and
• an advertisement transfer function of advertising to other upper layer nodes obstruction information which has been advertised.