| Patent application number | Description | Published |
|---|
| 20090201804 | Restoring aggregated circuits with circuit integrity checks in a hierarchical network - A system and method is disclosed that assures component circuits transported in aggregated circuits restore correctly after an aggregated circuit fault. The system and method implements component circuit tail segment integrity checks whenever an aggregated circuit is restored in a higher level of a network hierarchy. Switches at both ends of an aggregated circuit perform circuit integrity checks of the tail segments of every component circuit. A failure of the component circuit integrity check on any component circuit causes that component circuit to be released and restored end-to-end. | 08-13-2009 |
| 20100040069 | Routing system and method with OSPF area zero split into a two level hierarchy for route calculation - A method and system for routing traffic in an IP network using OSPF protocols and including core and hub routers in area zero. The core and hub routers are assigned different node signatures depending on whether the router is a core router or a hub router and link signatures match the node signatures. Internode traffic (core to core, hub to core, and hub to hub) is configured with routing algorithms separately for node and link network segments for which node and link signatures include core signatures as well as those of the internode pair selected. The OSPF routing for the separate network segments is then used to route traffic over the network. An IP network so configured will not route core traffic over hub links during periods of core element failure or downtime, and suffer packet loss. | 02-18-2010 |
| 20100091655 | Method and apparatus for initiating routing messages in a communication network - Switches within a telecommunications network exchange so-called available bandwidth messages, each of which advertises how much bandwidth remains unassigned on a respective link. The network is of a type in which circuits are provisioned with various predefined numbers of time slots (equivalent to bandwidth). The sending of an available bandwidth message for a given link is triggered by a change in the number of time slots available on that link if that change results in a change in the number of circuit bandwidths that can be accommodated by that link for a newly provisioned circuit. | 04-15-2010 |
| 20110007654 | Restoring Aggregated Circuits with Circuit Integrity Checks in a Hierarchical Network - A system and method is disclosed that assures component circuits transported in aggregated circuits restore correctly after an aggregated circuit fault. The system and method implements component circuit tail segment integrity checks whenever an aggregated circuit is restored in a higher level of a network hierarchy. Switches at both ends of an aggregated circuit perform circuit integrity checks of the tail segments of every component circuit. A failure of the component circuit integrity check on any component circuit causes that component circuit to be released and restored end-to-end. | 01-13-2011 |
