Patent ID: 6421316
Filing Date: 2002-07-16
Classification: H04L

Abstract:
A restoration method in a connection-oriented network where a point-to-multipoint connection is formed between a terminal which is a sending side of the connection (hereinafter, called root terminal) and a plurality of terminals which are a receiving side of the connection (hereinafter, called plural leaf terminals) through a plurality of nodes of the network and the point-to-multipoint connection is established and managed in the network without only dependence on the root terminal, comprising the steps of:at a first node of the nodes, determining whether a connection release message caused by a fault of the network is received from a node on the root terminal side of the first node after a first connection to one of the plural leaf terminals has been established in response to a first connection request message received from the one leaf terminal; maintaining the first connection to the one leaf terminal when the connection release message is received from a node on the root terminal side of the first node; sending a second connection request message to the network and waiting for a connection message for restoration to be received from the network in response to the second connection request message; and switching a route by connecting the first connection to a second connection determined by the connection message for restoration received from the network.