At&t Intellectual Property I, L.p.

At+t Corp.

Alex Snoeren

Jacobus Erasmus Van Der Merwe

Thomas Bradley Scholl

Dan Pei

Aman M Shaikh

Patrick Verkaik

Albert Gordon Greenberg

Jennifer Yates

Ramana Rao Kompella

A route control architecture allows a network operator to flexibly control routing between the traffic ingresses and egresses in a computer network, without modifying existing routers. An intelligent route service control point (IRSCP) replaces distributed BGP decision processes of conventional network routers with a route computation that is flexible and logically centralized but physically distributed. One embodiment supplements the traditional BGP decision process with a ranking decision process that allows route-control applications to explicitly rank traffic egresses on a per-destination, per-router basis. A straightforward set of correctness requirements prevents routing anomalies in implementations that are scalable and fault-tolerant.

Intelligent computer network routing using logically centralized, physically distributed servers distinct from network routers

A method and apparatus for automatically localizing failures in a network. Failures can be localized by receiving an observation, querying a database for a plurality of models of risks and calculating a hypothesis from the plurality of models of risks that explains the observation. The observation comprises link failures reported by a plurality of data sources. The plurality of models or risks represents links that would likely be impacted by the failure of each component within the network stored in a Shared Risk Link Group (SRLG) database. A Spatial Correlation Engine (SCORE) applies an algorithm to calculate a hypothesis from the plurality of models of risks that explains the observation, thereby, automatically localizing failures in a network.

Method and apparatus for fault localization in a network

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Fullerton, CA, United States of America

Alex Snoeren