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 |
20110216654 | Scheme for randomized selection of equal cost links during restoration - The present invention relates generally to restoration of services in a network. More particularly, the invention encompasses a scheme for randomized selection of equal cost links during restoration in a communication network. The invention further includes multiple schemes for restoring services. The network could consist of optical, ATM, FR, or IP/MPLS switches and cross-connects. | 09-08-2011 |
20120147885 | METHODS AND APPARATUS FOR NETWORK MULTICASTING USING HIERARCHICAL REPLICATION - Methods and apparatus for network multicasting using hierarchical replication are disclosed. An example method disclosed herein to send multicast data associated with a source to a plurality of receivers in a network comprises replicating the multicast data received at a first network node, the multicast data received via a first unicast path, the first network node being associated with a first hierarchical level of a replication hierarchy, sending copies of the multicast data to a plurality of network nodes associated with a second hierarchical level of the replication hierarchy via second unicast paths, and replicating a copy of the multicast data received via one of the second unicast paths at a second network node to send the multicast data via a third unicast path for receipt by a receiver in the plurality of receivers, the second network node being in the plurality of network nodes associated with the second hierarchical level. | 06-14-2012 |
20130010807 | SHARED BANDWIDTH RESERVATION IN PL, ATM, FR AND IP/MPLS NETWORKS - Disclosed example operations involve provisioning a pool of communication capacity in a network link, the pool of communication capacity including spare capacity; allocating from the spare capacity a reserve service communication capacity requested in a connection setup message associated with a first user, the reserve service communication capacity being available to accommodate an increase of communications associated with a first service connection for the first user; and while the reserve service communication capacity is allocated for the first service connection for the first user, provisioning the reserve service communication capacity to be available for restoration capacity associated with a second service connection for at least a second user. | 01-10-2013 |
20130107725 | METHODS, APPARATUS, AND ARTICLES OF MANUFACTURE TO PROVIDE A MULTICAST VIRTUAL PRIVATE NETWORK (MVPN) | 05-02-2013 |
20130250756 | 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. | 09-26-2013 |