公开(公告)号：US20220247586A1

公开(公告)日：2022-08-04

申请号：US17727348

申请日：2022-04-22

Applicant: Cisco Technology, Inc.

Inventor： PASCAL THUBERT ,  HUIMIN SHE ,  FEILIANG WANG ,  YINFANG WANG

IPC: H04L12/18 ,  H04L45/16 ,  H04L49/201

Abstract: In one embodiment, a method comprises: generating, by a constrained low power and lossy network (LLN) device that is localized within a subregion of an LLN, a thin destination oriented directed acyclic graph (DODAG) having up to a prescribed limit of attached LLN devices at each hop of the thin DODAG based on generating a DODAG information object (DIO) message specifying an instruction for limiting attachment at each hop of the thin DODAG to the prescribed limit; and causing, by the constrained LLN device, multicast-only transmissions via the thin DODAG based on inserting into the DIO message a multicast-only transmission mode via the thin DODAG and outputting the DIO message, the DIO message causing each neighboring LLN device to selectively attach to the constrained LLN device as an attached child LLN device based on the instruction and execute the multicast-only transmissions via the thin DODAG.

公开(公告)号：US20210320809A1

公开(公告)日：2021-10-14

申请号：US16844094

申请日：2020-04-09

Applicant: Cisco Technology, Inc.

Inventor： PASCAL THUBERT ,  HUIMIN SHE ,  FEILIANG WANG ,  YINFANG WANG

IPC: H04L12/18

Abstract: In one embodiment, a method comprises: generating, by a constrained low power and lossy network (LLN) device that is localized within a subregion of an LLN, a thin destination oriented directed acyclic graph (DODAG) having up to a prescribed limit of attached LLN devices at each hop of the thin DODAG based on generating a DODAG information object (DIO) message specifying an instruction for limiting attachment at each hop of the thin DODAG to the prescribed limit; and causing, by the constrained LLN device, multicast-only transmissions via the thin DODAG based on inserting into the DIO message a multicast-only transmission mode via the thin DODAG and outputting the DIO message, the DIO message causing each neighboring LLN device to selectively attach to the constrained LLN device as an attached child LLN device based on the instruction and execute the multicast-only transmissions via the thin DODAG.

公开(公告)号：US20210314290A1

公开(公告)日：2021-10-07

申请号：US16838252

申请日：2020-04-02

Applicant: Cisco Technology, Inc.

Inventor： PASCAL THUBERT ,  YINFANG WANG ,  HUIMIN SHE ,  FEILIANG WANG

IPC: H04L29/12 ,  H04L12/24 ,  H04L12/18 ,  H04L29/06

Abstract: In one embodiment, a method comprises: receiving, by a root network device providing a DAG topology in a low power and lossy network (LLN), one or more multicast registration messages from an LLN device and identifying distinct properties of the LLN device; receiving, by the root network device, one or more multicast address group identifiers of one or more multicast streams to which the LLN device has subscribed, and associating the one or more multicast address group identifiers with the distinct properties; receiving a multicast message specifying one of the multicast address group identifiers; and generating, by the root network device, a directed multicast message having a multi-dimensional addressing data structure comprising a selected one of the distinct properties and the one multicast address group identifier, causing parent network devices in the DAG topology to selectively retransmit based on determining a child network device has the selected one distinct property.