Fujitsu Corporation

Fujitsu Network Communications, Inc.

Peter W Bretschneider

Mashood Illikkal

Mark A W Stewart

Shantnu Sharma

Robert H Constantin

Sajin R Valoth

A system and method of reserving node resources along a desired path through a communications network that can be used to reserve resources across a fault such as an unconnected node interface or a disconnected link. The resource reservation technique is performed on a communications system including a plurality of nodes interconnected by at least one path to form a ring communications network. A communications link is identified within the path such that at least one node is disposed on a first side of the link and at least one node is disposed on a second side of the link. The identified link may have a fault. Resources are then reserved on the nodes disposed on the first side of the link by accessing the nodes over the path in a first direction around the ring network. Next, resources are reserved on the nodes disposed on the second side of the link by accessing the nodes from the first side over the path in a second direction around the ring network, in which the second direction is opposite the first direction. The path is then established without reallocating the node reservations.

Pre-provisioning a light path setup

A highly available communications system capable of circuit reestablishment and tear-down without manual intervention. The communications system includes a plurality of nodes interconnected by a plurality of communications paths to form at least one communications network. The nodes forward control packets on the network by way of a signaling protocol employing an out-of-band control technique. At least a portion of the nodes comprises a software configuration including a topology manager and a protocol manager. The protocol manager is operative to determine whether a control path is operational and whether a data transmission channel along a corresponding data path is established. In the event the control path is not operational, the protocol manager maintains the data transmission channel along the data path so long as the channel is established. The topology manager is operative to acquire network topology data, and the protocol manager is further operative to receive the topology data, deduce network topology changes therefrom, and reestablish and tear-down communications paths interconnecting the nodes based at least in part on the deduced topology changes.

Circuit reestablishment and tear down in a highly available communications system

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Brookline, NH, United States of America

Peter W Bretschneider