At&t Intellectual Property I, L.p.

At+t Corp.

Lucent Technologies Inc.

Wai Sum Lai

Wen-Jui Li

Gagan Choudhury

Tsong-Ho Wu

Moshe Segal

William G Lester

Arunabha Guha

Andrew Egan

Yonatan Aharon Levy

Zosim Kanevsky

Jun-Min Liu

Farhad Saheban

David James Houck, Jr

Charles A LaPadula

Concepts and technologies directed to network fault originator identification for virtual network infrastructure are disclosed herein. Embodiments can include a control system that is communicatively coupled with network infrastructure. The control system can include a processor and memory that, upon execution, causes the control system to perform operations. The operations can include determining, based on a source ticket, a network fault condition associated with the network infrastructure. The operations can further include identifying, from the source ticket, a trap set and an alarm set that are associated with origination of the network fault condition. The operations can include the control system collecting network event data from the network infrastructure prior to a polling time of a fault reporting schedule; determining that a qualified source ticket should be created; and generating the qualified source ticket based on the network event data.

Network fault originator identification for virtual network infrastructure

A method and an apparatus for detecting a port scan in a network are disclosed. For example, the method extracts statistics from a message, detects the port scan for a source internet protocol address, determines whether a port scan record exists for the source internet protocol address, creates a port scan record for the source internet protocol address that is extracted when the port scan record does not exist, determines an elapsed time when the port scan record does exist, wherein the elapsed time is determined as a difference between the time stamp that is extracted and a recorded time stamp, sets the recorded time stamp to be the extracted time stamp when the elapsed time is less than an intra-scan time, and determines the port scan has ended for the source internet protocol address when the elapsed time is not less than the intra-scan time.

Method and apparatus for detecting port scans in a network

An IP network topology update system may update IP network topology in near real-time and on-demand with minimum overheads. It identifies likely impact area (e.g., layer 2 or layer 3), objects (e.g., link or node such a device), and timing (e.g., what topology objects located where or when the topology update process should be performed) in the IP Layer 3 network and its underlying SDN Layer 2 network under virtualized networking infrastructure as candidates of impacts for topology update.

Dynamic update of virtual network topology

Methods and apparatus for hierarchical routing in communication networks are disclosed. An example hierarchical routing method for a communication network disclosed herein comprises determining a plurality of constrained weighted paths to connect pairs of border nodes of a cluster in the communication network, each constrained weighted path having a respective bandwidth and a respective weight, a constrained weighted path for a pair of border nodes of the cluster being selected, based on a bandwidth threshold, from a set of possible paths capable of connecting the pair of border nodes, and advertising the plurality of constrained weighted paths determined for the cluster.

Methods and apparatus for hierarchical routing in communication networks

Embodiments of the present invention are directed to characterizing reliability associated with a network. To characterize the reliability, an edge-pair reliability metric is determined for service edge point pairs. An end-to-end reliability metric is computed based on a distribution of the edge-pair reliability metric for the service edge point pairs and a threshold value.

Reliability metrics in an IP network

A communication system includes a plurality of devices, such as cable modems, in communication with a station, such as a cable modem termination system, that provides efficient upstream bandwidth sharing.

Network having bandwidth sharing

A method and apparatus is provided for allocating bandwidth and reducing jitter in an upstream transmission in a shared-media packet-switched access network with multiple upstream channels offering integrated Internet Protocol voice and high-speed data services. To allow multiple simultaneous CBR (constant-bit-rate) voice connections to be supported by a cable modem, when only a single channel can be accessed at a time, a method to select an upstream channel and assign to each connection a time slot in the upstream channel is provided. Jitter, i.e. packet delay variation, results when packets associated with a voice connection are not received at expected intervals. To maintain jitter within predetermined tolerances, the sequence of mini-slots in an upstream channel is divided into frames. Each frame will have a sequence of voice and data-only regions, and the voice region is divided into non-overlapping jitter windows of generally equal length. Even when an upstream channel change is required, each active voice connection is maintained in one of the jitter windows, thereby limiting jitter to the duration of a jitter window.

Upstream bandwidth allocation for packet telephony in a shared-media packet-switched access network

A system and method are described for assigning downstream and upstream communication pathways in broadband access networks, such as networks based on the hybrid fiber-coax architecture. In the upstream direction, frequency channel and time slot assignments use a packing opposite methodology, which is dependent on the type of service request. The system assigns the lowest time slot in the lowest frequency available for a DSO service request and the highest time slot in the highest frequency which has the next four contiguous time slots available for an H0 service request. To optimize upstream bandwidth efficiency, a H0 channel occupying the space of four contiguous time slots is used to carry up to six simultaneous voice conversations. A method is described that governs such use of H0 channels by NIUs according to their offered loads. In the downstream direction, network interface units are automatically assigned frequencies in response to the expected load across the available frequency channels and are made to spread evenly the load across all downstream frequency channels. In one embodiment, assignments are based upon each individual network interface unit load, each network interface unit group load, the capacity of each network interface unit group and the blocked load. An assignment will be made to the group having the maximum idle capacity, i.e., the group which has the greatest blocked load differential. That is, assignments are made if moving an individual NIU from a first NIU group to a second NIU group results in a blocked load differential greater than the cost ratio R, where R represents the cost of moving an NIU divided by the cost.

Frequency channel and time slot assignments in broadband access networks

A failure rate independent system for achieving zero defect data integrity in a computer transaction system is disclosed. The system receives events from an event generator and stores the raw events to disk. Structural information relating events to transactions is not stored on disk. Data which is lost after a system failure is reconstructed from the raw events during recovery. Transaction processing capacity is increased by trading off the continual updating of disk stored events and associated structural information for the post recovery reconstruction of structural information. As a result, zero defect data integrity is achieved at minimum processing cost.

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Matawan, NJ, United States of America

Wai Sum Lai