Rerouting in connection-oriented communication networks and communication systems

A method of rerouting a connection in a network having plurality of interconnected nodes defining a first domain, the connection being along a path between an originating node and a terminating node from the plurality of interconnected nodes, the first domain having a plurality of second domains defined by a subset of said plurality of interconnected nodes, said method comprising:

• detecting an event associated with the path and the connection;
• generating a reroute request upon detection of said event said request being associated with an identifier information element;
• determining a new path for the connection in accordance with said identifier element;
• and
• establishing the new path for the connection wherein the originating node and the terminating node remain connected;
• and
• along the path, the furthest downstream in each of said plurality of second domains behave as local routing and the furthest upstream nodes in each of said plurality of second domains behave as local rendezvous nodes;
• along the path, the furthest downstream of said plurality of second domains is a first second domains and the further upstream of said plurality of second domains is a second second domain;
• and
• a local rerouting node in said first second domain behaves as a global rerouting node and a local rendezvous node in said second second domain behaves as a global rendezvous node;
• and the step of determining said new first section is performed by a local rerouting node and a local rendezvous node from one of said plurality of second domains and the global rerouting node and global rendezvous node, the step of detecting said request including:
• detecting said identifier information element associated with said subset of said plurality of interconnected nodes from one of said plurality of second domains and other nodes from said plurality of interconnected nodes.

A system for rerouting a connection in a network having plurality of interconnected nodes defining a first domain, the connection being along a path between an originating node and a terminating node from the plurality of interconnected nodes, the first domain having a plurality of second domains defined by a subset of said plurality of interconnected nodes, said system comprising:

• means for detecting a request to reroute a first section of the path of the connection in a reroute domain, wherein said reroute domain is one of either the first domain or one of the plurality of second domains;
• means for determining a new first section for the path in said reroute domain;
• means for determining if the connection can be established along the path through said new first section;
• and
• means for requesting rerouting of the connection along a second section of the path in the other of either the first domain or one of the plurality of second domains when the connection along the path through said new first section is not established;
• said means for detecting said request includes:
• means for determining if said request is for detected failure rerouting or for path optimization;
• said request for detected failure routing is based on a failure in the network and indicates rerouting in one of the first domain, one of the plurality of second domains, or any of the first domain and one of the plurality of second domains and said request for path optimization indicates path optimization in one of the first domain, one of the plurality of second domains, or any of the first domain and one of the plurality of second domains;
• said means for detecting said request further includes:
• means for determining if said request indicates rerouting in the first domain, one of the plurality of second domains or any of the first domain and one of the plurality of second domains.

A system for rerouting a connection in a network having plurality of interconnected nodes defining a first domain, the connection being along a path between an originating node and a terminating node from the plurality of interconnected nodes, the first domain having a plurality of second domains defined by a subset of said plurality of interconnected nodes, said system comprising:

• an event detection mechanism for detecting a request to reroute a first section of the path of the connection in a reroute domain, said reroute domain is one of either the first domain or one of the plurality of second domains;
• a domain routing determination mechanism for determining a new first section for the path in said reroute domain;
• a connection control mechanism for determining if the connection can be established along the path through said new first section;
• a fail action mechanism for requesting rerouting of the connection along a second section of the path in the other of either the first domain or one of the plurality of second domains when the connection along the path through said new first section is not established;
• said event detection mechanism includes:
• a request cause detection mechanism for determining if said request is for detected failure rerouting or for path optimization;
• said request for detected failure routing is based on a failure in the network and indicates rerouting in one of the first domain, one of the plurality of second domains, or any of the first domain and one of the plurality of second domains and said request for path optimization indicates path optimization in one of the first domain, one of the plurality of second domains, or any of the first domain and one of the plurality of second domains;
• said event detection mechanism further includes:
• a request domain detection mechanism for determining if said indicates rerouting in the first domain, one of the plurality of second domains or any of the first domain and one of the plurality of second domains.

A computer readable medium having stored thereon computer-executable instructions for rerouting a connection in a network having plurality of interconnected nodes defining a first domain, the connection being along a path between an originating node and a terminating node from the plurality of interconnected nodes, the first domain having a plurality of second domains defined by a subset of said plurality of interconnected nodes, said computer-executable instructions comprising:

• detecting a request to reroute a first section of the path of the connection in a reroute domain, said reroute domain is one of either the first domain or one of the plurality of second domains;
• determining a new first section for the path in said reroute domain;
• determining if the connection can be established along the path through said new first section;
• and
• requesting rerouting of the connection along a second section of the path in the other of either the first domain or one of the plurality of second domains when the connection along the path through said new first section is not established;
• the computer-executable instructions for detecting said request includes:
• determining if said request is a request for detected failure rerouting or a request for path optimization;
• said request for detected failure routing is based on a failure in the network and indicates rerouting in one of the first domain, one of the plurality of second domains, or any of the first domain and one of the plurality of second domains;
• the computer-executable instructions for detecting said request further includes:
• determining if said request for detected failure routing indicates rerouting in the first domain, one of the plurality of second domains or any of the first domain and one of the plurality of second domains.