公开(公告)号：US10887224B2

公开(公告)日：2021-01-05

申请号：US16397124

申请日：2019-04-29

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Huimin She ,  Patrick Wetterwald ,  Li Zhao

IPC: H04L12/46 ,  H04L12/751 ,  H04L12/753 ,  H04L29/08

Abstract: In one embodiment, a method comprises attaching, by a constrained network device in a data network, to a first parent network device in a tree-based storing mode topology in response to receiving a first advertisement message generated by the first parent network device; outputting to the first parent network device a plurality of routes stored in the constrained network device, the routes identifying destinations reachable via the constrained network device; determining, by the constrained network device, that the first parent network device is encountering saturation of stored routes based on the constrained network device receiving a second advertisement message from the first parent network device; and eliminating, by the constrained network device, the saturation encountered by the first parent network device based on moving at least a portion of the routes from the first parent network device to a second parent network device in the tree-based storing mode topology.

公开(公告)号：US20200322809A1

公开(公告)日：2020-10-08

申请号：US16375778

申请日：2019-04-04

Applicant: Cisco Technology, Inc.

Inventor： Li Zhao ,  Chuanwei Li ,  Lele Zhang ,  Huimin She

IPC: H04W16/18 ,  H04W4/02 ,  G06F17/50

Abstract: Systems, methods, and computer-readable media for identifying a deployment scheme for forming a wireless mesh network based on environmental characteristics and an optimum deployment scheme. In some examples, a geographical area for deployment of a wireless mesh network is identified. Additionally, environmental information of the geographical area can be collected. Network characteristics of an optimum deployment scheme for forming the wireless mesh network can be defined. As follows, a deployment scheme for forming the wireless mesh network can be identified based on the network characteristics of the optimum deployment scheme and the environmental information of the geographical area.

公开(公告)号：US10715422B2

公开(公告)日：2020-07-14

申请号：US16026203

申请日：2018-07-03

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Jianzhou Chen ,  Huimin She ,  Patrick Wetterwald

IPC: H04L12/761 ,  H04L12/753 ,  H04L12/705 ,  H04L12/751 ,  H04L12/703 ,  H04W28/02 ,  H04L12/26 ,  H04W24/04

Abstract: In one embodiment, a parent network device, operating according to a first Trickle operation using a first selected minimum contention interval, responds to detecting a loss of attached child network devices by starting a second Trickle operation using a second selected minimum contention interval. The second Trickle operation includes maintaining the second selected minimum contention interval for subsequent iterations of the second Trickle operation. The parent network device initiates an accelerated transmission rate of the advertisement message that is faster than the first and second Trickle operations (using a third selected minimum contention interval less than the first minimum contention interval) in response to receiving a message from one of the lost child network devices, and resumes the first Trickle operation upon recovery of all the lost child network devices.

公开(公告)号：US11909545B2

公开(公告)日：2024-02-20

申请号：US17866768

申请日：2022-07-18

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Huimin She ,  Chuanwei Li ,  Lele Zhang

IPC: H04L12/18 ,  H04L12/46 ,  H04L45/00 ,  H04L1/08

CPC classification number: H04L12/1845 ,  H04L1/08 ,  H04L12/189 ,  H04L12/4633 ,  H04L45/32

Abstract: In one embodiment, a method comprises: identifying, by a low power and lossy network (LLN) device in a low power and lossy network, a minimum distance value and a distance limit value for limiting multicast propagation, initiated at the LLN device, of a multicast data message in the LLN; and multicast transmitting, by the LLN device, the multicast data message with a current distance field specifying the minimum distance value and a distance limit field specifying the distance limit value, the multicast transmitting causing a receiving LLN device having a corresponding rank in the LLN to respond to the multicast data message by: (1) determining an updated distance based on adding to the current distance field a rank difference between the receiving LLN device and the LLN device, and (2) selectively retransmitting the multicast data message if the updated distance is less than the distance limit value.

公开(公告)号：US11653220B2

公开(公告)日：2023-05-16

申请号：US16375778

申请日：2019-04-04

Applicant: Cisco Technology, Inc.

Inventor： Li Zhao ,  Chuanwei Li ,  Lele Zhang ,  Huimin She

IPC: H04W16/18 ,  H04W4/02 ,  G06F30/20 ,  H04W84/18

CPC classification number: H04W16/18 ,  G06F30/20 ,  H04W4/025 ,  H04W84/18

Abstract: Systems, methods, and computer-readable media for identifying a deployment scheme for forming a wireless mesh network based on environmental characteristics and an optimum deployment scheme. In some examples, a geographical area for deployment of a wireless mesh network is identified. Additionally, environmental information of the geographical area can be collected. Network characteristics of an optimum deployment scheme for forming the wireless mesh network can be defined. As follows, a deployment scheme for forming the wireless mesh network can be identified based on the network characteristics of the optimum deployment scheme and the environmental information of the geographical area.

公开(公告)号：US11558194B2

公开(公告)日：2023-01-17

申请号：US17336179

申请日：2021-06-01

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Huimin She ,  Patrick Wetterwald ,  Akram Ismail Sheriff ,  Eric Michel Levy-Abegnoli

IPC: H04L9/32 ,  H04L9/30 ,  G06F16/901 ,  H04L61/5007 ,  H04L45/00

Abstract: In one embodiment, a method comprises: receiving, by a parent network device providing at least a portion of a directed acyclic graph (DAG) according to a prescribed routing protocol in a low power and lossy network, a destination advertisement object (DAO) message, the DAO message specifying a target Internet Protocol (IP) address claimed by an advertising network device in the DAG and the DAO message further specifying a secure token associated with the target IP address; and selectively issuing a cryptographic challenge to the DAO message to validate whether the advertising network device generated the secure token.

公开(公告)号：US11245678B2

公开(公告)日：2022-02-08

申请号：US16432661

申请日：2019-06-05

Applicant: Cisco Technology, Inc.

Inventor： Li Zhao ,  Pascal Thubert ,  Huimin She ,  Haibo Dong

IPC: H04L29/06 ,  H04W40/02 ,  H04W28/02 ,  H04W12/033

Abstract: In one embodiment, a method comprises: registering, by a root network device in a low power and lossy network, a constrained network device that is reachable within the low power and lossy network; obtaining, by the root network device, executable code associated with execution of a network service operation by the constrained network device; receiving a data packet from a source device and destined for the constrained network device; and causing execution on the data packet, by the root network device, of the network service operation on behalf of the constrained network device in response to reception of the data packet.

公开(公告)号：US10931399B2

公开(公告)日：2021-02-23

申请号：US16289859

申请日：2019-03-01

Applicant: Cisco Technology, Inc.

Inventor： Lele Zhang ,  Huimin She ,  Chuanwei Li ,  Nan Yi

IPC: G01R31/08 ,  G06F11/08 ,  G08C15/00 ,  H04J1/16 ,  H04J3/14 ,  H04L1/00 ,  H04L12/26 ,  H04W74/08 ,  H04L12/44

Abstract: In one embodiment, a method comprises determining, by a network device in a wireless data network, that a prescribed Clear Channel Assessment (CCA) threshold is unsuitable for use on an identified wireless network channel among available wireless network channels, based on a determined variance of a corresponding channel transmit attempt failure rate for the identified wireless network channel, relative to an expected variance in channel transmit attempt failure rates that is determined across the respective available wireless network channels; and selectively adjusting the corresponding CCA threshold for the identified wireless network channel, until a second determined variance of the corresponding channel transmit attempt failure rate, at the identified wireless network channel, falls below a prescribed channel failure rate variance factor relative to the expected variance.

公开(公告)号：US10917196B2

公开(公告)日：2021-02-09

申请号：US16273251

申请日：2019-02-12

Applicant: Cisco Technology, Inc.

Inventor： Wenjia Wu ,  Nan Yi ,  Huimin She ,  Chuanwei Li

IPC: H04L1/00 ,  H04L29/06 ,  H04L5/00 ,  H04L1/16 ,  H04W28/06 ,  H04W80/02 ,  H04L29/08 ,  H04W72/04 ,  H04L12/723

Abstract: In one embodiment, a device in a network determines that a plurality of packets should be aggregated, each of the plurality of packets comprising a payload. The device generates, for each of the payloads, a sub-media access control (sub-MAC) header that comprises a sequence number and a frame check sequence (FCS). The device forms an aggregated packet that comprises a physical layer (PHY) header, a MAC header, the payloads, and the generated sub-MAC headers for the payloads. The device sends the aggregated packet to another device in the network.

公开(公告)号：US20200259736A1

公开(公告)日：2020-08-13

申请号：US16274979

申请日：2019-02-13

Applicant: Cisco Technology, Inc.

Inventor： Huimin She ,  Feiliang Wang ,  Li Zhao ,  Chuanwei Li

IPC: H04L12/733 ,  H04L12/751 ,  H04L12/44 ,  H04L29/08 ,  H04L12/24

Abstract: In one embodiment, a method comprises determining, by a network device, a hop-by-hop path in a low-power and lossy network having a tree-based topology originated at a root network device, the hop-by-hop path comprising identified network devices for forwarding a data packet from a source network device to a destination device in the tree-based topology; and causing, by the network device, the destination device to initiate generation of a locally-optimized tree that bypasses the root network device and optimizes forwarding of the data packet from the source network device to the destination device, based on confined advertisements within the tree-based topology relative to the identified network devices.