Patent ID: 7302494
Filing Date: 2007-11-27
Classification: H04L

Abstract:
1. A traffic engineering method of a network divided into a plurality of areas, each area including a plurality of nodes, said method comprising the steps of: carrying out a load-balancing process at a boundary node in said each area in a closed manner; calculating a normalized value used for the load-balancing process, based on address information of a packet supplied to an ingress node of the network from outside of the network; adding said normalized value to switching information of said packet; forwarding said packet from said ingress node to the plurality of nodes; receiving said packet from said ingress node at an area boundary node located on a boundary of the plurality of areas; extracting said normalized value, used for carrying out the load-balancing process in an area including said area boundary node, from the switching information of said packet; redistributing a traffic flow from a failed route to a route other than the failed route if receiving a failure notification at said ingress node or said area boundary node; deciding whether a traffic loss occurs by redistributing the traffic flow from said failed route to the route other than said failed route; and setting a new route and switching the traffic flow to the new route when it is decided at said deciding step that the traffic loss occurs by redistributing the traffic flow from said failed route to the route other than said failed route.