Patent ID: 6272107
Filing Date: 2001-08-07
Classification: H04L

Abstract:
In an Asynchronous Transfer Mode (ATM) network including a source and destination user, end nodes including source and destination nodes and a plurality of transit nodes, a method of restoring a call in the event of a link failure, said method comprising the steps of:establishing a first active switch table and a first redundant switch table on said source node;establishing a second active switch table and a second redundant switch table on said destination node;establishing a first Switched Virtual Circuit (SVC) call from said source user to said destination user to function as an active path;establishing a second SVC call from said source node to said destination node to function as a redundant path;configuring said first active switch table and said second active switch table to utilize said first SVC as the active path;configuring said first redundant switch table and said second redundant switch table to utilize said second SVC as the redundant path using a global call ID to identity said second SVC call as the redundant path;receiving an indication at said end nodes that a link failure has occurred; andconfiguring said source node to use the redundant path in response to said indication wherein said redundant path is determined in accordance with said first redundant switch table, and configuring said destination node to use the redundant path in response to said indication wherein said redundant path is determined in accordance with said second redundant switch table.