Patent ID: 6122753
Filing Date: 2000-09-19
Classification: H04L,H04Q

Abstract:
A fault recovery system in a connection oriented network employing a protocol establishing line connection using a source routing system which performs path computation on the basis of a topology information exchanged between nodes, for establishing a path bypassing a failure upon occurrence of failure in connection used in said network,said nodes comprising:first release message receiving means for receiving a release message generated upon occurrence of failure;bypassing process judgment means for making judgment whether a bypassing process is primarily performed by a first node or not, depending upon a relationship of positions of a faulty portion, indicated in said release message, and said first node;path computing means for performing path computation excluding said faulty portion when said bypassing process judgment means makes judgment that said bypassing process, in which said first node becomes a master, is to be performed;setup message transmitting means for transmitting a setup message added an information of said faulty portion, for establishing a bypass path on the basis of bypass path information obtained by said path computing means when said bypassing process judgment means makes judgment that said bypassing process, in which said first node becomes a master, is to be performed;switching means for performing switching by connecting said bypass path established by said setup message and a path in a direction toward a terminal not causing failure from said first node; andfirst release message transmitting means for abandoning said release message in responsive to completion of switching by said switching means, and for transmitting said release message in a direction toward a terminal when switching is not completed.