公开(公告)号：US12184538B2

公开(公告)日：2024-12-31

申请号：US17672388

申请日：2022-02-15

Applicant: AT&T Intellectual Property I, L.P.

Inventor： Narayan Padi ,  Shweta Vachhani ,  Aswatnarayan Raghuram ,  Juby J. Chacko ,  Harpreet Ahluwalia ,  Kenichi Futamura ,  Gagan Choudhury ,  Alvin C. Goddard

IPC: H04L45/28 ,  H04L43/0882 ,  H04L43/16

Abstract: Aspects of the subject disclosure may include, for example, obtaining for a first path carrying first network traffic a corresponding first alternate path; obtaining for a second path carrying second network traffic a corresponding second alternate path, at least a first portion of the first alternate path being the same as at least a second portion of the second alternate path; responsive to a first detected failure on the first path, causing communication of first re-directed network traffic via the first alternate path instead of via the first path; responsive to a second detected failure on the second path, detecting whether total traffic, including the first re-directed network traffic, on the first portion of the first alternate path meets a threshold; responsive to the detected meeting of the threshold, obtaining for the second path a corresponding back-up alternate path; and causing communication of second re-directed network traffic via the back-up alternative path instead of via the second path. Other embodiments are disclosed.

公开(公告)号：US20230370363A1

公开(公告)日：2023-11-16

申请号：US17744274

申请日：2022-05-13

Applicant: AT&T Intellectual Property I, L.P.

Inventor： Narayan Padi ,  Gagan Choudhury ,  Alvin C. Goddard ,  Harpreet Ahluwalia ,  Aswatnarayan Raghuram

IPC: H04L45/247

CPC classification number: H04L45/247

Abstract: Aspects of the subject disclosure may include, for example, obtaining node data identifying for a network a source node, a destination node and a plurality of other nodes; obtaining reference path data identifying a reference path from the source node to the destination node; obtaining alternate path data identifying a plurality of alternate paths from the source node to the destination node, setting for the reference path a possible split threshold identifying a traffic bandwidth which can trigger a re-direction of traffic from the reference path; determining whether a current traffic flow on the reference path meets the possible split threshold, resulting in a first determination; responsive to the first determination, obtaining, subsequent to the setting for the reference path of the possible split threshold, current alternate path data for each of the plurality of alternate paths, wherein the current alternate path data comprises for each of the alternate paths a respective current alternate path bandwidth availability; responsive to the obtaining of the current alternate path data, determining whether a particular one of the plurality of alternate paths can support carrying of at least some of the current traffic flow on the reference path, resulting in a second determination, wherein the second determination is based at least in part upon the current alternate path bandwidth availability of each of the plurality of alternate paths; and responsive to the second determination, re-directing a portion of the current traffic flow from the reference path to the particular one of the alterative paths. Other embodiments are disclosed.

公开(公告)号：US20230261967A1

公开(公告)日：2023-08-17

申请号：US17672320

申请日：2022-02-15

Applicant: AT&T Intellectual Property I, L.P.

Inventor： Narayan Padi ,  Tzuu-Yi Wang ,  Harpreet Ahluwalia ,  Gagan Choudhury ,  Aswatnarayan Raghuram ,  Alvin C. Goddard ,  Manu Thannickal ,  Lynn Rivera ,  SHESHASHAILAVAS CHINTHAKAYALA

IPC: H04L45/12 ,  H04L45/42 ,  H04L43/0882 ,  H04L43/0817 ,  H04L12/46

CPC classification number: H04L45/123 ,  H04L12/4641 ,  H04L43/0817 ,  H04L43/0882 ,  H04L45/42

Abstract: Aspects of the subject disclosure may include, for example, detecting whether a bandwidth capacity loss occurs on a first link bundle connecting one or more first core routers of a core Interior Gateway Protocol (IGP) network with one or more first provider routers, resulting in a detected capacity loss, wherein communication between the one or more first core routers of the core IGP network and the one or more first provider routers utilizes a Border Gateway Protocol (BGP), wherein a second link bundle connects one or more second core routers of the core IGP network with one or more second provider routers, and wherein communication between the one or more second core routers of the core IGP network and one or more second provider routers utilizes the BGP; responsive to the detected capacity loss, automatically increasing a cost associated with selected network traffic that was to be carried between the one or more first provider routers and the one or more first core routers of the core IGP network and that will instead be re-directed for communication via the second link bundle; and causing communication via the second link bundle of the selected network traffic, wherein the communication via the second link bundle of the selected network traffic is between the one or more second provider routers and the one or more second core routers of the core IGP network. Other embodiments are disclosed.

公开(公告)号：US20230261980A1

公开(公告)日：2023-08-17

申请号：US17672388

申请日：2022-02-15

Applicant: AT&T Intellectual Property I, L.P.

Inventor： Narayan Padi ,  Shweta Vachhani ,  Aswatnarayan Raghuram ,  Juby J. Chacko ,  Harpreet Ahluwalia ,  Kenichi Futamura ,  Gagan Choudhury ,  Alvin C. Goddard

IPC: H04L45/28 ,  H04L43/0882 ,  H04L43/16

CPC classification number: H04L45/28 ,  H04L43/16 ,  H04L43/0882

Abstract: Aspects of the subject disclosure may include, for example, obtaining for a first path carrying first network traffic a corresponding first alternate path; obtaining for a second path carrying second network traffic a corresponding second alternate path, at least a first portion of the first alternate path being the same as at least a second portion of the second alternate path; responsive to a first detected failure on the first path, causing communication of first re-directed network traffic via the first alternate path instead of via the first path; responsive to a second detected failure on the second path, detecting whether total traffic, including the first re-directed network traffic, on the first portion of the first alternate path meets a threshold; responsive to the detected meeting of the threshold, obtaining for the second path a corresponding back-up alternate path; and causing communication of second re-directed network traffic via the back-up alternative path instead of via the second path. Other embodiments are disclosed.

公开(公告)号：US10728140B2

公开(公告)日：2020-07-28

申请号：US15845280

申请日：2017-12-18

Applicant: AT&T Intellectual Property I, L.P.

Inventor： Gagan Choudhury ,  Kang Xi ,  Simon Tse ,  Narayan Padi ,  Alvin Goddard ,  Aswatnarayan Raghuram

IPC: H04L12/721 ,  H04L12/723 ,  H04L12/771 ,  H04L12/24 ,  H04L12/803 ,  H04L12/851 ,  H04L12/801 ,  H04L12/715 ,  H04L12/717 ,  H04L12/707 ,  H04L12/703

Abstract: Concepts and technologies disclosed herein are directed to deadlock-free traffic rerouting in software-defined networking (“SDN”) networks. According to one aspect of the concepts and technologies disclosed herein, a centralized SDN controller can determine that a packet flow along a path within at least a portion of a network is to be rerouted from the path to a new path. The centralized SDN controller can initiate a reroute of the packet flow to the new path. The centralized SDN controller can request a bandwidth for the new path. The bandwidth can be determined such that bandwidth oversubscription on the new path is avoided. In response to the packet flow settling on the new path, the centralized SDN controller can adjust a requested bandwidth of the packet flow to a desired value to complete the reroute of the packet flow from the path to the new path.

公开(公告)号：US20250088458A1

公开(公告)日：2025-03-13

申请号：US18955257

申请日：2024-11-21

Applicant: AT&T Intellectual Property I, L.P.

Inventor： Narayan Padi ,  Shweta Vachhani ,  Aswatnarayan Raghuram ,  Juby J. Chacko ,  Harpreet Ahluwalia ,  Kenichi Futamura ,  Gagan Choudhury ,  Alvin C. Goddard

IPC: H04L45/28 ,  H04L43/0882 ,  H04L43/16

Abstract: Aspects of the subject disclosure may include, for example, obtaining for a first path carrying first network traffic a corresponding first alternate path; obtaining for a second path carrying second network traffic a corresponding second alternate path, at least a first portion of the first alternate path being the same as at least a second portion of the second alternate path; responsive to a first detected failure on the first path, causing communication of first re-directed network traffic via the first alternate path instead of via the first path; responsive to a second detected failure on the second path, detecting whether total traffic, including the first re-directed network traffic, on the first portion of the first alternate path meets a threshold; responsive to the detected meeting of the threshold, obtaining for the second path a corresponding back-up alternate path; and causing communication of second re-directed network traffic via the back-up alternative path instead of via the second path. Other embodiments are disclosed.

公开(公告)号：US20190190819A1

公开(公告)日：2019-06-20

申请号：US15845280

申请日：2017-12-18

Applicant: AT&T Intellectual Property I, L.P.

Inventor： Gagan Choudhury ,  Kang Xi ,  Simon Tse ,  Narayan Padi ,  Alvin Goddard ,  Aswatnarayan Raghuram

IPC: H04L12/721 ,  H04L12/723 ,  H04L12/771 ,  H04L12/801 ,  H04L12/803 ,  H04L12/851 ,  H04L12/24

CPC classification number: H04L45/38 ,  H04L41/0896 ,  H04L41/145 ,  H04L45/22 ,  H04L45/28 ,  H04L45/42 ,  H04L45/50 ,  H04L45/56 ,  H04L45/64 ,  H04L47/11 ,  H04L47/122 ,  H04L47/2441

Abstract: Concepts and technologies disclosed herein are directed to deadlock-free traffic rerouting in software-defined networking (“SDN”) networks have been disclosed herein. According to one aspect of the concepts and technologies disclosed herein, a centralized SDN controller can determine that a packet flow along a path within at least a portion of a network is to be rerouted from the path to a new path. The centralized SDN controller can initiate a reroute of the packet flow to the new path. The centralized SDN controller can request a bandwidth for the new path. The bandwidth can be determined such that bandwidth oversubscription on the new path is avoided. In response to the packet flow settling on the new path, the centralized SDN controller can adjust a requested bandwidth of the packet flow to a desired value to complete the reroute of the packet flow from the path to the new path.