公开(公告)号：US12052532B2

公开(公告)日：2024-07-30

申请号：US17871093

申请日：2022-07-22

Applicant: Cisco Technology, Inc.

Inventor： Luca Della Chiesa ,  Christian Schmutzer

IPC: G01H9/00 ,  H04B10/07 ,  H04B10/073 ,  H04B10/61 ,  H04Q11/00

CPC classification number: H04Q11/0062 ,  G01H9/004 ,  H04B10/07 ,  H04B10/073 ,  H04B10/615 ,  H04Q2011/0073 ,  H04Q2011/0083

Abstract: Presented herein are techniques to manage optical network infrastructure. A method includes inducing a predetermined vibration on a fiber optic cable, the predetermined vibration being sufficient to cause a change to at least one of a state of polarization and a phase of optical signals being carried by respective optical fibers in the fiber optic cable, detecting, at a first endpoint, using a first coherent optical receiver, and at a second endpoint, using a second coherent optical receiver, the change to the at least one of the state of polarization and the phase of the optical signals, and based on the detecting, determining that the first endpoint and the second endpoint are connected to, or in communication with, one another via at least one finer in the fiber optic cable.

公开(公告)号：US11792042B1

公开(公告)日：2023-10-17

申请号：US17302303

申请日：2021-04-29

Applicant: Cisco Technology, Inc.

Inventor： Christian Schmutzer ,  Onkar R. Deshpande ,  Patrick J. Cunningham

IPC: H04L12/46 ,  H04L45/50 ,  H04L45/00

CPC classification number: H04L12/4633 ,  H04L45/50 ,  H04L45/66 ,  H04L2212/00

Abstract: Interworking between different layer two (L2) medias using network tunnels is provided by receiving, at a virtual gateway network element (GNE), a packet from a first L2 media type network for transmission to a second L2 media type network under the control of a different entities, wherein the first and second L2 media type networks are incompatible for direct packet transmission; removing, at the virtual GNE, ethernet encapsulation from the packet; re-encapsulating, at a network device located between the virtual GNE and a packet network, the packet in a multi-protocol label switching (MPLS) encapsulation; forwarding, over the packet network, the packet from the network device to a digital communication channel (DCC) associated with the second L2 media type network; replacing, at the DCC, the MPLS encapsulation with a link access protocol (LAP) encapsulation; and transmitting the packet encapsulated with the LAP encapsulation to the second L2 media type network.

公开(公告)号：US20240348559A1

公开(公告)日：2024-10-17

申请号：US18357029

申请日：2023-07-21

Applicant: Cisco Technology, Inc.

Inventor： Christian Schmutzer ,  Francois Clad ,  Stephane Litkowski

IPC: H04L47/726 ,  H04L45/50 ,  H04L45/52

CPC classification number: H04L47/726 ,  H04L45/50 ,  H04L45/52

Abstract: Techniques for enabling a resource reservation routing protocol (e.g., the Resource Reservation Protocol-Traffic Engineering (RSVP-TE) protocol) to perform routing operations based at least in part on bandwidth reservations by a non-reservation protocol (e.g., the Segment Routing (SR) protocol) are described herein. In some cases, the techniques described herein enable an example network to use both a resource reservation protocol and a non-reservation protocol. In some cases, one or more bandwidth reservation measures associated with a label-switched path (LSP) associated with a non-reservation protocol (e.g., an SR LSP) are used to create LSPs associated with a resource reservation protocol (e.g., RSVP-TE LSPs).

公开(公告)号：US20220224410A1

公开(公告)日：2022-07-14

申请号：US17145862

申请日：2021-01-11

Applicant: Cisco Technology, Inc.

Inventor： Raghunandan Annavajjala ,  Sudhir Kayamkulangara ,  Christian Schmutzer ,  Luca Della Chiesa ,  Rayen Mohanty

IPC: H04B10/032 ,  H04L12/707 ,  H04Q11/00

Abstract: In one example, a first Provider Edge (PE) node is configured to communicate with a second PE node through a packet-switched network and with a third PE node through the packet-switched network. The first PE node communicates with a fourth PE node via the second PE node. The fourth PE node is configured to communicate with the second PE node over a working path through a time-division multiplexing transport network. The first PE node exchanges, with the fourth PE node, protection information. Based on exchanging the protection information, the first PE node communicates with the fourth PE node via the third PE node. The fourth PE node is further configured to communicate with the third PE node over a protection path through the time-division multiplexing transport network.

公开(公告)号：US20240129250A1

公开(公告)日：2024-04-18

申请号：US17968071

申请日：2022-10-18

Applicant: Cisco Technology, Inc.

Inventor： Luca Della Chiesa ,  Christian Schmutzer ,  Raghupathi Somashekarappa

IPC: H04L47/28 ,  H04L47/56

CPC classification number: H04L47/28 ,  H04L47/56

Abstract: A method is provided to compensate for differential delay among a plurality of paths between first and second nodes in a network. The method may involve measuring delay for each of the plurality of paths for a plurality of sub-flows transmitted between the first node and the second node on respective paths of the plurality of paths. The plurality of sub-flows are obtained by splitting a traffic flow. The method involves determining delay differences among the delay for each of the plurality of paths, and adjusting, based on the delay differences, a queue delay associated with a respective flow of the plurality of sub-flows on one or more of the plurality of paths to achieve a path delay that is equal to a target path delay for each of the plurality of paths.

公开(公告)号：US11595119B2

公开(公告)日：2023-02-28

申请号：US17145862

申请日：2021-01-11

Applicant: Cisco Technology, Inc.

Inventor： Raghunandan Annavajjala ,  Sudhir Kayamkulangara ,  Christian Schmutzer ,  Luca Della Chiesa ,  Rayen Mohanty

IPC: H04B10/032 ,  H04L45/00 ,  H04Q11/00

Abstract: In one example, a first Provider Edge (PE) node is configured to communicate with a second PE node through a packet-switched network and with a third PE node through the packet-switched network. The first PE node communicates with a fourth PE node via the second PE node. The fourth PE node is configured to communicate with the second PE node over a working path through a time-division multiplexing transport network. The first PE node exchanges, with the fourth PE node, protection information. Based on exchanging the protection information, the first PE node communicates with the fourth PE node via the third PE node. The fourth PE node is further configured to communicate with the third PE node over a protection path through the time-division multiplexing transport network.

公开(公告)号：US20240340236A1

公开(公告)日：2024-10-10

申请号：US18296399

申请日：2023-04-06

Applicant: Cisco Technology, Inc.

Inventor： Bharath Vasudevan ,  Christian Schmutzer

IPC: H04L45/50 ,  H04L9/40 ,  H04L12/66 ,  H04L45/00

CPC classification number: H04L45/50 ,  H04L12/66 ,  H04L45/66 ,  H04L63/0272

Abstract: Presented herein are techniques that remove the unnecessary provisioning system complexities of manual inter-domain service/circuit stitching by introducing a solution to perform dynamic end-to-end circuit setup in a hybrid networking environment. A method is provided that is performed by a gateway node at a boundary of a first domain and a second domain of a hybrid network, the first domain and the second domain using different types of transport and different types of control planes.

公开(公告)号：US20240022467A1

公开(公告)日：2024-01-18

申请号：US17865952

申请日：2022-07-15

Applicant: Cisco Technology, Inc.

Inventor： Christian Schmutzer ,  Patrice Brissette ,  Rakesh Gandhi

IPC: H04L41/0654 ,  H04L43/0823

CPC classification number: H04L41/0654 ,  H04L43/0823

Abstract: In one example, techniques are provided for extending an active measurement protocol with an Operations, Administration and Management/Maintenance (OAM) channel. A first Provider Edge (PE) node obtains from or provides to a second PE node, over a packet-switched network via an overlay, OAM data in an OAM channel of the active measurement protocol. The OAM data relates to a networking issue. The network issue is automatically resolved responsive to the OAM data.

公开(公告)号：US20220103480A1

公开(公告)日：2022-03-31

申请号：US17032874

申请日：2020-09-25

Applicant: Cisco Technology, Inc.

Inventor： Luca Della Chiesa ,  Christian Schmutzer ,  Patrice Brissette

IPC: H04L12/803 ,  H04L12/911 ,  H04L12/891 ,  H04L12/707 ,  H04L12/46

Abstract: Techniques are presented herein for load-balancing a sequence of packets over multiple network paths on a per-packet basis. In one example, a first network node assigns sequence numbers to a sequence of packets and load-balances the sequence of packets on a per-packet basis over multiple network paths of a network to a second network node. The second network node buffers received packets that are received over the multiple network paths of the network from the first network node and re-orders the received packets according to sequence numbers of the received packets.

公开(公告)号：US11239932B2

公开(公告)日：2022-02-01

申请号：US16230849

申请日：2018-12-21

Applicant: Cisco Technology, Inc.

Inventor： Raghunandan Annavajjala ,  Anand B. Agarwal ,  Onkar R. Deshpande ,  Christian Schmutzer

IPC: H04J3/06 ,  H04J3/16 ,  H04J3/14

Abstract: Techniques for emulating a time division multiplexed (TDM) circuit using a packet switched network are described. First and second packet nodes are installed in a communication network. The first TDM node and second TDM node form a first span in the TDM circuit. First and second fiber connections are disconnected from the first and second TDM nodes, and connected to the first and second packet nodes. A portion of TDM data transmission across the first span is emulated using a packet connection formed by the first packet node and the second packet node. The TDM data transmission includes transport overhead data, and the packet connection emulates the transport overhead data.