Optical network control devices and optical path setting method

An optical network control device comprising:

• a topology information management database including an electric layer information management database that manages a configuration of a logical link associated with a physical route including an optical transmission line connecting a plurality of nodes and a logical route selection index value of the logical link as a first route selection index value;
• and
• a computer configured to:
• set, based on topology information including a connection relationship among the plurality of nodes and the first route selection index value of routes each connecting the plurality of nodes, a first path for a route having the first route selection index value being minimum from among route candidates linking a start point node and an end point node of a requested traffic;
• calculate a second route selection index value acquired by increasing the first route selection index value of the route that accommodates the first path;
• select a second path for a route having the second route selection index value being minimum from among the route candidates, wherein the route is a logical route associated with an electric layer connecting the plurality of nodes by an electric node device, and the first path is a first electric path on the logical route and the second path is a second electric path on the logical route,
• search for a first logical route having the logical route selection index value being minimum from among route candidates of the first electric path that accommodates the requested traffic in the logical link,
• determine, as a route of the second electric path, a second logical route having a minimum modified logical route setting index value as the second route selection index value acquired by increasing the logical route selection index value of the first logical route, and
• refer to a configuration of a transmission line associated with a logical link that accommodates the first electric path and calculate the modified logical route setting index value.

An optical path setting method comprising:

• setting, based on topology information including a connection relationship among a plurality of nodes and a first route selection index value of routes each connecting the plurality of nodes, a first path for a route having the first route selection index value being minimum from among route candidates linking a start point node and an end point node of a requested traffic;
• calculating a second route selection index value acquired by increasing the first route selection index value of the route that accommodates the first path;
• selecting a second path for a route having the second route selection index value being minimum from among the route candidates;
• and
• calculating the second route selection index value by executing any one of linear summing of a transmission line quality value being communication quality specific to the route and an optical path specific value being a numerical value previously set for each of the first path, multiplication of the transmission line quality value and the optical path specific value, and replacement of the transmission line quality value with the optical path specific value.