公开(公告)号：US11736393B2

公开(公告)日：2023-08-22

申请号：US17902158

申请日：2022-09-02

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Eric Levy-Abegnoli ,  Patrick Wetterwald

IPC: H04L45/00 ,  H04L12/46 ,  H04L45/02 ,  H04L49/201

CPC classification number: H04L45/566 ,  H04L12/4641 ,  H04L45/02 ,  H04L45/72 ,  H04L49/201

Abstract: Techniques for leveraging MLD capabilities at edge nodes of network fabrics to receive SNMAs from silent hosts, and creating unicast addresses from the SNMAs for the silent nodes that are used as secondary matches in a network overlay if primary unicast address lookups fail. The edge nodes described herein may act as snoopers of MLD reports in order to identify the SNMAs of the silent hosts. The edge nodes then forge unicast addresses for the silent hosts that match with the least three bytes of the SNMAs. The forged unicast addresses are presented as unicast MAC/IP mappings in the fabric overlay. In situations where a primary IP address lookup fails, the look-up device performs a secondary lookup for a mapped address that has the last three bytes of the IP address. If a mapping is found, the lookup is sent as a unicast message to the matching MAC address.

公开(公告)号：US11716274B2

公开(公告)日：2023-08-01

申请号：US17866465

申请日：2022-07-15

Applicant: Cisco Technology, Inc.

Inventor： Nagendra Kumar Nainar ,  Carlos M. Pignataro ,  Pascal Thubert

IPC: G06F15/16 ,  H04L43/12 ,  H04L43/0817

CPC classification number: H04L43/12 ,  H04L43/0817

Abstract: This disclosure describes techniques for monitoring expected behavior of devices in a computing network. Behavior of network devices may include performing various functions associated with transferring data packets through the computing network. Monitoring expected behavior may include sending a probe packet into the computing network, and determining whether network devices behave as expected with respect to the probe packet. In some examples, behaviors such as replicating, forwarding, eliminating, ordering, and/or other functions regarding data packets may be validated using the present techniques. As computing networks and/or operations become more complex, assuring the expected behavior of network devices may become more important for the continued efficient, smooth, successful, and/or timely flow of data traffic.

公开(公告)号：US20230239871A1

公开(公告)日：2023-07-27

申请号：US17581136

申请日：2022-01-21

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Alessandro ERTA ,  Amine CHOUKIR ,  Domenico FICARA ,  Patrick WETTERWALD

IPC: H04W72/12 ,  H04L67/568 ,  H04W16/28

CPC classification number: H04W72/1273 ,  H04L67/2842 ,  H04W16/28 ,  H04W84/18

Abstract: In one embodiment, a client device enters an area having an overhead mesh of access points, each access point comprising one or more directional transmitters each configured to transmit a beam cone in a substantially downward direction towards a floor of the area. The client device obtains an area-dependent communication schedule for the overhead mesh that is exclusive or partially-exclusive to the client device for the area. The client device sends, during an arbitrary timeslot of the area-dependent communication schedule, a pull request. The client device receives, from a particular access point in the overhead mesh, a packet in response to the pull request.

公开(公告)号：US20230239352A1

公开(公告)日：2023-07-27

申请号：US17581204

申请日：2022-01-21

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Patrick WETTERWALD ,  Alessandro ERTA ,  Domenico FICARA ,  Amine CHOUKIR

IPC: H04L67/12 ,  G16Y10/75 ,  G16Y40/35

CPC classification number: H04L67/12 ,  G16Y10/75 ,  G16Y40/35 ,  H04W84/18

Abstract: In one embodiment, a controller identifies access points forming an overhead mesh of access points in an area, each access point comprising one or more directional transmitters each configured to transmit a beam cone in a substantially downward direction towards a floor of the area. The controller determines coverage areas on the floor of the area for the one or more directional transmitters of the access points in the overhead mesh. The controller generates, based on the coverage areas, alternating communication schedules for the access points such that a client device at any given location on the floor of the area is within range of a plurality of receiving access points in the overhead mesh and at least one transmitting access point in the overhead mesh at a certain point in time. The controller sends the communication schedules to the access points.

公开(公告)号：US20230179579A1

公开(公告)日：2023-06-08

申请号：US18104603

申请日：2023-02-01

Applicant: Cisco Technology, Inc.

Inventor： David A. Maluf ,  Srinath Gundavelli ,  Pascal Thubert ,  Pradeep Kumar Kathail ,  Eric Levy-Abegnoli ,  Eric Voit ,  Ali Sajassi

IPC: H04L9/40 ,  H04L61/2521 ,  H04L61/4511

CPC classification number: H04L63/0421 ,  H04L61/2525 ,  H04L61/4511

Abstract: Techniques for using Network Address Translation (NAT), Mobile Internet Protocol (MIP), and/or other techniques in conjunction with Domain Name System (DNS) to anonymize server-side addresses in data communications. Rather than having DNS provide a client device with an IP address of an endpoint device, such as a server, the DNS instead returns a random IP address that is mapped to the client device and the endpoint device. In this way, IP addresses of servers are obfuscated by a random IP address that cannot be used to identify the endpoint device or service. The client device may then communicate data packets to the server using the random IP address as the destination address, and a gateway that works in conjunction with DNS can convert the random IP address to the actual IP address of the server using NAT and forward the data packet onto the server.

公开(公告)号：US11659436B2

公开(公告)日：2023-05-23

申请号：US17347640

申请日：2021-06-15

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Patrick Wetterwald ,  Eric Michel Levy-Abegnoli

IPC: H04L12/721 ,  H04W28/02 ,  H04L49/50

CPC classification number: H04W28/0289 ,  H04L49/50

Abstract: In one embodiment, a method comprises: determining, by a network switching device, whether the network switching device is configured as one of multiple leaf network switching devices, one of multiple Top-of-Fabric (ToF) switching devices, or one of multiple intermediate switching devices in a switched data network having a leaf-spine switching architecture; if configured as a leaf switching device, limiting flooding of an advertisement only to a subset of the intermediate switching devices in response to detecting a mobile destination is reachable; if configured as an intermediate switching device, flooding the advertisement, received from any one of the leaf network switching devices, to connected ToF switching devices without installing any routing information specified within the advertisement; if configured as a ToF switching device, installing from the flooded advertisement the routing information and tunneling a data packet, destined for the mobile destination, to the leaf switching device having transmitted the advertisement.

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：US11516120B2

公开(公告)日：2022-11-29

申请号：US17101579

申请日：2020-11-23

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Nagendra Kumar Nainar ,  Carlos M. Pignataro

IPC: H04L45/48 ,  H04L45/12 ,  H04L45/02 ,  H04W40/24 ,  H04L12/44

Abstract: In one embodiment, a method is performed. A spine node in communication with a network may determine a subtree of a shadow cone of the spine node. The subtree may comprise a plurality of nodes and a plurality of links connecting pairs of the nodes. The spine node may determine a disaggregated route to a first leaf node to which a disaggregated prefix may be attached. The disaggregated route may be propagated to the plurality of the nodes of the subtree.

公开(公告)号：US11513985B2

公开(公告)日：2022-11-29

申请号：US16933878

申请日：2020-07-20

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Jerome Henry

IPC: G06F13/28 ,  H04W74/08 ,  G06F15/173

Abstract: A wireless device can achieve higher predictability for its transmissions by inserting a placeholder frame in a transmission queue before time sensitive data has been received. In addition, a contention countdown associated with the placeholder frame can start before the time sensitive data is ready for transmission. Once the data is available, the device can insert the data into the payload of the placeholder frame, thereby reducing the wait time before the data can be transmitted wirelessly. Additionally, the device can improve reliability by transmitting data using multiple subcarrier RUs in a channel. The data blocks and the duplicative data can be transmitted in parallel using the subcarrier RUs. If a subset of the subcarrier RUs are blocked because of narrowband interference, the receiving device can nonetheless recover the data blocks and reconstruct the packet from the data transported on the RUs that did not have interference.

公开(公告)号：US11463916B2

公开(公告)日：2022-10-04

申请号：US17145201

申请日：2021-01-08

Applicant: Cisco Technology, Inc.

Inventor： Pascal Thubert ,  Arman Rezaee

IPC: H04W28/18

Abstract: Optimal determination of wireless network pathway configurations may be provided. A computing device may receive an error profile and a response instruction associated with the error profile, as generated by a network controller. The computing device may then monitor, for an error, on a communication Track, in a network, between an ingress node and an egress node. Then, the computing device, upon detecting the error, can determine that the error is similar to the error profile, and based on the determination that the error is similar to the error profile, enact the response instruction. The response instruction can direct the computing device to switch from the communication Track to a communication subTrack between the ingress node and the egress node.