Patent ID: 7133370

Claim:
A network topology collection device comprising: first means for demanding, from an opposed node which terminates a route which is an SDH or SONET link terminated by a node to which the network topology collection device itself belongs, route connection state information indicating a connection state of the route, and for preparing opposed topology information based on responded route connection state information; and second means for collecting opposed topology information of a node directly or indirectly routed to the node to which the network topology collection device itself belongs, wherein the route connection state information comprises an identifier of the opposed node and an identifier of an edge of the opposed node side of the route, and the opposed neighborhood topology information comprises an aggregation aggregating route data, composed of identifiers of both terminal edges of a route and identifiers of terminal nodes which comprise terminal edges which respectively terminate the both terminal edges of said route, for all of the routes terminated by the node to which the network topology collection device itself belongs.