公开(公告)号：US11539613B2

公开(公告)日：2022-12-27

申请号：US17213393

申请日：2021-03-26

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Huimin She ,  Ling Wei

IPC: H04L45/02 ,  H04L12/46

Abstract: In one embodiment, a method comprises determining, by a controller device in a low power and lossy network (LLN), that a first LLN border device is in a first personal area network (PAN) having a first directed acyclic graph (DAG) topology, and that the first LLN border device is a neighbor of a second LLN border device in a second PAN of the LLN having a second DAG topology; receiving a path request for a third LLN device in the first PAN to reach a fourth LLN device in the second PAN; and generating an inter-PAN path between the third LLN device and the fourth LLN device via the first and second LLN border devices, the inter-PAN path providing a stitching between the first DAG topology and the second DAG topology.

公开(公告)号：US11463350B2

公开(公告)日：2022-10-04

申请号：US17102003

申请日：2020-11-23

Applicant: Cisco Technology, Inc.

Inventor： Ling Wei ,  Wenjia Wu ,  Nan Yi ,  Chuanwei Li

IPC: H04L12/28 ,  H04L45/30 ,  H04L12/46 ,  H04L12/18

Abstract: In one embodiment, a method comprises: determining, by a network device that is configured for joining a local directed acyclic graph (DAG) instance in a data network, an unreachability by the network device to any member of the local DAG instance; generating and broadcasting, by the network device, a request message that identifies the network device requesting to join the local DAG instance, the request message causing a neighboring network device in a global DAG instance of the data network to rebroadcast the request message for reception by a member of the local DAG instance, the neighboring network device a non-member of the local DAG instance; and receiving, by the network device, a reply message indicating a member of the local DAG instance is reachable via the neighboring network device in the global DAG instance.

公开(公告)号：US10932195B1

公开(公告)日：2021-02-23

申请号：US16574295

申请日：2019-09-18

Applicant: Cisco Technology, Inc.

Inventor： Lele Zhang ,  Ling Wei ,  Xi Wu ,  Tonglin Yuan

IPC: H04W8/00 ,  H04W52/02 ,  H04W84/18 ,  H04W40/24

Abstract: In one embodiment, a method comprises: generating and storing, by a parent device in a low power lossy network (LLN), first state variables associated with a first execution state of an attached child during an active state of the child; determining a request, received by the parent device, is destined for the child and specifying a second execution state to be executed by the child; selectively updating, by the parent device, the first state variables with second state variables associated with the second execution state identifying an updated execution state for the child; detecting, by the parent device, that the child has transitioned from a sleep state to a second active state, and in response generating an instruction based on the second state variables; and transmitting the instruction to the child during the second active state, causing the child to execute the second execution state.