| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method, a program, a system and a device capable of achieving preset reliability requirements for both the site protection and link protection of a virtual network.SOLUTION: For each of a plurality of virtual nodes included in the network topology request of a virtual network provider, a site cluster including a plurality of sites in a physical network satisfying the resource requirements of virtual node is determined, and one or more transition path in a physical network satisfying the backup link requirements of the link between the sites in a site cluster is selected. Furthermore, for each of a plurality of virtual links included in the network topology request, a plurality of paths between two site clusters in a physical network satisfying the virtual link requirements are determined, and then a primary path linking two site clusters and at least one backup path are determined among the paths thus determined.</p> |
