公开(公告)号：US20190356584A1

公开(公告)日：2019-11-21

申请号：US16389195

申请日：2019-04-19

Applicant: Cisco Technology, Inc.

Inventor： Nagendra Kumar Nainar ,  Richard Furr ,  Carlos M. Pignataro ,  Joseph Michael Clarke

IPC: H04L12/723 ,  H04L12/715 ,  H04L12/721 ,  H04L12/46

Abstract: Presented herein are segment-routing methods and systems that facilitate data plane signaling of a packet as a candidate for capture at various network nodes within a segment routing (SR) network. The signaling occurs in-band, via the data plane—that is, a capture or interrogation signal is embedded within the respective packet that carries a user traffic. The signaling is inserted, preferably when the packet is classified, e.g., at the ingress node of the network, to which subsequent network nodes with the SR network are signaled to capture or further inspect the packet for capture.

公开(公告)号：US10469278B2

公开(公告)日：2019-11-05

申请号：US15792609

申请日：2017-10-24

Applicant: Cisco Technology, Inc.

Inventor： Om Prakash Suthar ,  Rajiv Asati ,  Nagendra Kumar Nainar ,  Carlos M. Pignataro

IPC: H04L12/18 ,  H04L12/26 ,  H04W48/16 ,  H04L12/24 ,  H04L12/741 ,  H04L29/06

Abstract: In accordance with various implementations, a method is performed at a multicast gateway node within an operator network, where the multicast gateway node includes one or more processors, non-transitory memory, an ingress interface, and one or more egress interfaces. The method includes determining a multicast identifier for a user device in response to obtaining a registration request associated with the user device. The method also includes generating a header for a multicast data stream based at least in part on the multicast identifier in response to obtaining a multicast flow join request. The method further includes populating a packet associated with the multicast data stream with the header. The method further includes forwarding the packet to the user device via a portion of the one or more egress interfaces, where the portion of the one or more egress interfaces is associated with the user device.

公开(公告)号：US10454828B2

公开(公告)日：2019-10-22

申请号：US15386306

申请日：2016-12-21

Applicant: Cisco Technology, Inc.

Inventor： Carlos M. Pignataro ,  Nagendra Kumar Nainar ,  Rajiv Asati ,  K. Tirumaleswar Reddy

IPC: H04L12/26 ,  H04L12/46 ,  H04L12/733 ,  H04L29/06 ,  H04L12/801 ,  H04L12/911 ,  H04L12/707 ,  H04L12/24

Abstract: In one embodiment, a device in a network receives in-situ operations administration and management (iOAM) data regarding a plurality of traffic flows in the network. The iOAM data comprises entropy values for the plurality of traffic flows. The device receives network topology information indicative of network paths available in the network. The device generates a machine learning-based entropy topology model for the network based on the received iOAM data and the received network topology information. The entropy topology model maps path selection predictions for the network paths with entropy values. The device uses the entropy topology model to cause a particular traffic flow to use a particular network path.

公开(公告)号：US20190312818A1

公开(公告)日：2019-10-10

申请号：US16449991

申请日：2019-06-24

Applicant: Cisco Technology, Inc.

Inventor： Nagendra Kumar Nainar ,  Carlos M. Pignataro ,  Rajiv Asati

IPC: H04L12/841 ,  H04L12/851 ,  H04L12/717 ,  H04L12/721 ,  H04L29/06 ,  H04L29/08 ,  H04L12/725

Abstract: In some aspects, a method of the technology can include steps for sending a packet along a service function chain (SFC) to an egress node, the SFC comprising a plurality of service function forwarders (SFFs), wherein each SFF is associated with at least one service function (SF), and receiving the packet at a first SFF in the SFC, wherein the first SFF is associated with a first SF. In some aspects, the first SFF can also be configured to perform operations including: reading an option flag of the packet, and determining whether to forward the packet to the first based on the option flag. Systems and machine-readable media are also provided.

公开(公告)号：US20190297017A1

公开(公告)日：2019-09-26

申请号：US15934247

申请日：2018-03-23

Applicant: Cisco Technology, Inc.

Inventor： Carlos M. Pignataro ,  Prashanth Patil ,  Nagendra Kumar Nainar ,  Robert Edgar Barton ,  Jerome Henry ,  Muthurajah Sivabalan

IPC: H04L12/803 ,  H04L12/801 ,  H04L12/26 ,  H04L29/06

Abstract: In one example embodiment, a first path computation element of a first segment routing domain includes a plurality of path computation clients. The first path computation element obtains, from at least one path computation client of the plurality of path computation clients, telemetry data indicating network traffic congestion for the at least one path computation client. Based on the telemetry data, the first path computation element determines that the at least one path computation client is experiencing at least a predetermined amount of network traffic congestion. In response to determining that the at least one path computation client is experiencing at least the predetermined amount of network traffic congestion, the first path computation element sends, to a second path computation element of a second segment routing domain, an indication of the network traffic congestion for the at least one path computation client.

公开(公告)号：US10419550B2

公开(公告)日：2019-09-17

申请号：US15203759

申请日：2016-07-06

Applicant: Cisco Technology, Inc.

Inventor： Nagendra Kumar Nainar ,  Rajiv Asati ,  Carlos M. Pignataro

IPC: H04L29/08 ,  H04L12/721 ,  H04L12/26 ,  H04L12/24

Abstract: Systems, methods, and computer-readable media for improving the reliability of service function (SF) application in a service function chain (SFC) are provided. In some aspects, the subject technology facilitates automatic service function type validation by a service function forwarder (SFF), for example, by using a probe configured to query a function type of a SF module associated with the validating SFF.

公开(公告)号：US10404592B2

公开(公告)日：2019-09-03

申请号：US15469306

申请日：2017-03-24

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Rajiv Asati ,  Nagendra Kumar Nainar ,  Carlos M. Pignataro

IPC: H04L12/741 ,  H04L29/06 ,  H04L29/08 ,  H04L12/715

Abstract: A method is provided in one example embodiment and may include receiving a packet by a forwarder in an Information-Centric Networking (ICN) network; determining Bit Index Explicit Replication (BIER) information associated with the packet; and forwarding the packet based, at least in part, on the BIER information associated with the packet. The packet can be an interest packet or a data packet received by the forwarder in the ICN network.

公开(公告)号：US10355983B2

公开(公告)日：2019-07-16

申请号：US15149695

申请日：2016-05-09

Applicant: Cisco Technology, Inc.

Inventor： Reinaldo Penno ,  Carlos M. Pignataro ,  Nagendra Kumar Nainar

IPC: H04L12/28 ,  H04L12/721 ,  H04L29/06 ,  H04L12/26 ,  H04L29/08 ,  H04L12/24

Abstract: A packet is received at a network device hosting a service function that is part of a service chain. The packet is sent to the network device from an originating network device. The content of the packet is analyzed to determine that the packet comprises a request for statistical values to be aggregated by the network device. The statistical values are aggregated at the network device. A report comprising the statistical values aggregated at the network device is generated. The report is sent to the originating network device.

公开(公告)号：US20190182127A1

公开(公告)日：2019-06-13

申请号：US15834291

申请日：2017-12-07

Applicant: Cisco Technology, Inc.

Inventor： Carlos M. Pignataro ,  Nagendra Kumar Nainar ,  Rajiv Asati

IPC: H04L12/24 ,  G06N99/00

Abstract: A method is provided to generate a network risk heatmap. The method includes obtaining first data related to technical support and operations issues of a network that includes a plurality of network elements and second data related to updates and configurations of the network. The method involves analyzing the first data and the second to generate a device risk heatmap rule that determines a level of predictive failure risk as a function of network telemetry data indicative of real-time operations of the network. The method further includes applying the device risk heatmap rule to network telemetry data collected from the network to create a network heatmap representing a level of predictive failure risk for the plurality of network elements in the network. The method then includes instantiating a path or tunnel in the network based on the network heatmap.

公开(公告)号：US10298491B2

公开(公告)日：2019-05-21

申请号：US15247077

申请日：2016-08-25

Applicant: Cisco Technology, Inc.

Inventor： Deepak Kumar ,  Yi Yang ,  Carlos M. Pignataro ,  Nagendra Kumar Nainar

IPC: H04L12/28 ,  H04L12/721 ,  H04L12/751 ,  H04L12/709

Abstract: In response to a path monitoring task for a particular source/destination pair, a network controller determines whether stored information includes paths for the particular source/destination pair. When the stored information includes paths for the particular source/destination pair, a subset of source ports is selected that covers all the paths for the particular source/destination pair. A probe message is sent to cause an ingress switch to send probe packets using the subset of source ports. Paths for the particular source/destination pair are computed based on received probe packets. A determination is made whether a topology for the data center network has changed by comparing the paths computed based on the receive probe packets for the particular source/destination pair with the paths included in the stored information for the particular source/destination pair.