Patent ID: 8467288
Filing Date: 2013-06-18
Classification: H04L

Abstract:
1. A method of switching a path in a network system constituted by a plurality of node apparatuses and links connecting the apparatuses, the method comprising: in a first path including a start node apparatus, an end node apparatus, intermediate node apparatuses, and links between these node apparatuses, transmitting a failure notification message to the start node apparatus from a node apparatus that detects that information about deterioration in transmission quality of a link among the links included in the first path indicates a value equal to or higher than a first threshold; searching, by the start node apparatus, for a second path avoiding the link at which the deterioration in transmission quality has been detected based on the failure notification message; creating, in the start node apparatus, a path setting message for setting the second path and transmitting the path setting message to each of the nodes of the second path up to the end node; and after setting the second path, transmitting, by the start node apparatus, an instruction to switch from the first path to the second path.