Patent ID: 8116228
Filing Date: 2012-02-14
Classification: H04L

Abstract:
1. A network path control system comprising: a plurality of communication nodes connected by links of a network: and a path control device having a database for storing topology information showing states of use of the links in the network, wherein the path control device comprises: a path solution unit to determine a path in the network referring to the database; a path setting request unit to request at least one of the communication nodes to set the path according to the determined path; an internal update unit to recognize a link included in the determined path and to tentatively update the database with tentative topology information corresponding to the link; a topology information collection unit to collect topology information from at least one of the communication nodes, wherein the collected topology information is determined from the path setting at the at least one of the communication nodes; and an update determination unit to compare the tentative topology information with the collected topology information to verify the tentative topology information, wherein when the database is updated with the tentative topology information corresponding to the link, the internal update unit stores the tentative topology information corresponding to the link already stored in the database into a first table in the database, the first table including a storing period information, and when the storing period of the tentative topology information in the first table reaches a predetermined period and upon determination that the database is not updated with the collected topology information, the update determination unit updates the database with the link information stored in the first table.