Patent ID: 6034961
Filing Date: 2000-03-07
Classification: H04L,H04Q

Abstract:
An active/standby routing system for use in an ATM (asynchronous transfer mode) network of communication nodes interconnected by links, said network having a topology described by topology information, to establish an active route and a standby route on the basis of said topology information between nodes:a connection signaling message exchanged between the nodes for routing includes a connection pair identifier unique to the ATM network to identify the active route and a standby route that is paired with the active route and active/standby information indicating either of the active and standby route; andthe nodes includea topology information table for storing routing messages;active and standby route information tables for recording information related to routes that have been set up;a connection pair table for recording information related to paired active and standby routes which have been set up;routine means for exchanging routing messages with adjacent nodes to update the topology information table; andsignaling means for requesting calculations of an active route and a standby route for the active route, for obtaining each of the routes which have been set up from the route information table, and for generating setup signaling messages and sending them through the set routes, when one of said nodes is operable as a first node,wherein one of said nodes is operable as a repeating node and comprises:signaling means for setting routes based on the signaling messages received and transmitting the same through the set routes.