Patent ID: 7545829
Filing Date: 2009-06-09
Classification: H04L

Abstract:
1. A layered network node which is provided in a network consisting of one or a plurality of layers, comprising: means for mutually interchanging link state information about a present node and links which are connected to the present node with other nodes; means for storing the link state information for one or for all of the nodes within said network which has been obtained by said interchanging means; means for selecting a path for a Label Switch Path (LSP) of one or a plurality of types of layer, based upon the link state information which has been stored in said storing means according to an LSP establishment request; and means for changing the path which has been selected and established by said selection means, according to an LSP change request, based upon the link state information which has been stored in said storing means, wherein the network to which said node belongs is a layered network, the layered network comprises virtual networks of a plurality of levels, each of the virtual networks belonging to each level comprises one or a plurality of virtual nodes belonging to the each level, each of the virtual nodes serves as a cell, each cell comprises one or a plurality of nodes, a virtual node in a virtual network belonging to a lower level, which is a level other than the highest level, is a node in a virtual network belonging to a level higher than the lower level, and if a link exists which connects between different virtual nodes of the same level or of different levels, the border between the link and each of the different virtual nodes is an interface of each of the different virtual nodes, and the layered network node further comprises a link state database which accumulates link state information which is advertised from other nodes within a virtual node to which self node belongs or from other virtual nodes, and the nodes which fulfill a function of interfacing with nodes within the virtual node or with the exterior of the virtual node are defined as border nodes, and the layered network node further comprises: a link state abstraction section comprising means for, when the present node is positioned at this border node, creating interface information for the exterior of the virtual node based upon the link state information interior to the virtual node; and an advertisement section which advertises said interface information which has been created to the exterior of the virtual node.