Patent ID: 8514714

Claim:
A method for providing forwarding information and quality of service (QoS) information in a flow based network environment, the method comprising: acquiring first information and second information from a flow table of a network device on the basis of status information of a flow; determining whether or not the acquired first information and second information are updated on the basis of an ID read from the flow table; and updating the flow table when it is determined that the acquired first information and second information are updated, wherein the first information includes a route ID and a first route update serial number, and wherein the determining whether or not the acquired first information and second information are updated includes: verifying a second route update serial number stored in a route update validation table storing unit in the network device on the basis of the route ID; verifying whether the first route update serial number and the second route update serial number are the same as each other; and updating the first information in the flow table by determining that the first information is updated if the first route update serial number and the second route update serial number are different from each other.