公开(公告)号：US20230370370A1

公开(公告)日：2023-11-16

申请号：US18223731

申请日：2023-07-19

Applicant: Cisco Technology, Inc.

Inventor： Nagendra Kumar Nainar ,  Carlos M. Pignataro ,  Zafar Ali

IPC: H04L45/50 ,  H04L45/02 ,  H04L43/50 ,  H04L43/10 ,  H04L45/42

CPC classification number: H04L45/50 ,  H04L45/02 ,  H04L43/50 ,  H04L43/10 ,  H04L45/42

Abstract: Techniques for initiator-based data-plane validation of segment routed, multiprotocol label switched (MPLS) networks are described herein. In examples, an initiating node may determine to validate data-plane connectivity associated with a network path of the MPLS network. The initiating node may store validation data in a local memory of the initiating node. In examples, the initiating node may send a probe message that includes a request for identification data associated with a terminating node. The terminating node may send a probe reply message that includes the identification data, as well as, in some examples, a code that instructs the initiating node to perform validation. In examples, the initiating node may use the validation data stored in memory to compare to the identification data received from the terminating node to validate data-plane connectivity. In some examples, the initiating node may indicate a positive or negative response after performing the validation.

公开(公告)号：US20230171178A1

公开(公告)日：2023-06-01

申请号：US17538091

申请日：2021-11-30

Applicant: Cisco Technology, Inc.

Inventor： Amila Pradeep Kumara Tharaperiya Gamage ,  Rakesh Gandhi ,  Zafar Ali

IPC: H04L43/50 ,  H04L45/02 ,  H04L45/24

CPC classification number: H04L43/50 ,  H04L45/02 ,  H04L45/24

Abstract: Systems, methods, and computer-readable media are disclosed for validating multiple paths used for routing network traffic in a network. In one aspect, a network controller can identify one or more intermediate nodes on each of multiple paths in a network, wherein the multiple paths begin at a first network node and end at a last network node. The network controller can further generate a data packet with a label at the first network node, forward the test data packet from the first network node, along each of the one or more intermediate nodes, to the last network node, and perform a data plane validation process for validating packet forwarding from the first network node to the last network node based on the label(s) by determining if a number of the multiple paths equals to a number of packets received at the last network node.

公开(公告)号：US20230155926A1

公开(公告)日：2023-05-18

申请号：US18153903

申请日：2023-01-12

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Zafar Ali ,  Frank Brockners

IPC: H04L45/302 ,  H04L45/02 ,  H04L45/12 ,  H04L69/22

CPC classification number: H04L45/302 ,  H04L45/04 ,  H04L45/127 ,  H04L45/306 ,  H04L69/22 ,  H04L2212/00

Abstract: The present technology provides a system and method for implementing targeted collection of in-situ Operation, Administration and Maintenance data from select nodes in a Segment Routing Domain. The selection is programmable and is implemented by setting an iOAM bit in the function arguments field of a Segment Identifier. In this way only the nodes associated with local Segment Identifiers (Function field of a Segment Identifier) with an iOAM argument bit are directed to generate iOAM data. The iOAM data generated by target nodes may be stored in TLV field of the segment routing header. The Segment Routing packet is then decapsulated at a Segment Routing egress node and the Header information with the collected iOAM data is sent to a controller entity for further processing, analysis and/or monitoring.

公开(公告)号：US11611505B2

公开(公告)日：2023-03-21

申请号：US17404817

申请日：2021-08-17

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Francois Clad ,  Zafar Ali ,  Peter Psenak

IPC: H04L12/721 ,  H04L45/00 ,  H04L69/22 ,  H04L45/02

Abstract: Techniques and mechanisms for compressing the size of SIDs to be smaller than a complete IPv6 address (or “micro SIDs”), and scaling micro SIDs across a multi-domain environment using micro SID-domain-blocks. Segment routing over IPv6 (SRv6) uses 128-bit IPv6 addresses as SIDs for segment routing. According to this disclosure, multiple SRv6 SIDs may be expressed in a compact format such that a 128-bit IPv6 address, such as the destination address field of the IPv6 header, may store multiple micro SIDs. Further, SID-domain-blocks may be assigned to each domain in a multi-domain network such that micro SIDs may be expressed in the context of a given domain, rather than being shared in the global multi-domain network. In this way, lists of domain-specific SIDs may be fully expressed in the IPv6 destination address of the packet to scale micro SID into large, multi-domain networks.

公开(公告)号：US11563683B2

公开(公告)日：2023-01-24

申请号：US17493334

申请日：2021-10-04

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Jisu Bhattacharya ,  Zafar Ali ,  Syed Kamran Raza

IPC: H04L12/749 ,  H04L45/741 ,  H04L45/02 ,  H04L45/745 ,  H04L61/2557

Abstract: In one embodiment, a method includes receiving a packet comprising a destination address in a destination address field of the packet, where the destination address including at least a first global identifier and a second global identifier, determining that the first global identifier corresponds to the first network apparatus, determining that a local identifier in the destination address is associated with the first global identifier, identifying one or more instructions associated with the local identifier, performing one or more functions instructed by the one or more instructions, updating the destination address in the destination field of the packet to an updated destination address, determining a forwarding rule associated with the packet, and forwarding the packet with the updated destination address based on the forwarding rule.

公开(公告)号：US11558295B2

公开(公告)日：2023-01-17

申请号：US17115451

申请日：2020-12-08

Applicant: Cisco Technology, Inc.

Inventor： Nagendra Kumar Nainar ,  Carlos M. Pignataro ,  Zafar Ali ,  Syed Kamran Raza

IPC: H04L45/74 ,  H04L45/745 ,  H04L43/12

Abstract: The present disclosure includes methods, systems, and non-transitory computer-readable media for validating data in a data structure used for forwarding packets by a network device comprising sending a data packet probe identifying a destination and including a segment ID, wherein the segment ID maps to a first interpretation by a receiving router to perform an action on the data packet probe to rewrite a portion of a destination address in a header of the data packet probe, and to redirect the data packet probe to the network device that initiated the data packet probe.

公开(公告)号：US20220417137A1

公开(公告)日：2022-12-29

申请号：US17811570

申请日：2022-07-08

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Zafar Ali ,  Syed Kamran Raza ,  Ahmed Refaat Bashandy ,  Nagendra Kumar Nainar ,  Carlos M. Pignataro ,  Jaganbabu Rajamanickam ,  Rakesh Gandhi ,  Bhupendra Yadav ,  Faisal Iqbal

IPC: H04L45/00 ,  H04L43/106 ,  H04L45/02 ,  H04L41/0246

Abstract: In one embodiment, a service chain data packet is instrumented as it is communicated among network nodes in a network providing service-level and/or networking operations visibility. The service chain data packet includes a particular header identifying a service group defining one or more service functions, and is a data packet and not a probe packet. A network node adds networking and/or service-layer operations data to the particular service chain data packet, such as, but not limited to, in the particular header. Such networking operations data includes a performance metric or attribute related to the transport of the particular service chain packet in the network. Such service-layer operations data includes a performance metric or attribute related to the service-level processing of the particular service chain data packet in the network.

公开(公告)号：US11296982B2

公开(公告)日：2022-04-05

申请号：US16852932

申请日：2020-04-20

Applicant: Cisco Technology, Inc.

Inventor： Nagendra Kumar Nainar ,  Carlos M. Pignataro ,  Zafar Ali

IPC: H04L12/723 ,  H04L45/50 ,  H04L45/02 ,  H04L43/50 ,  H04L43/10 ,  H04L45/42

Abstract: Techniques for initiator-based data-plane validation of segment routed, multiprotocol label switched (MPLS) networks are described herein. In examples, an initiating node may determine to validate data-plane connectivity associated with a network path of the MPLS network. The initiating node may store validation data in a local memory of the initiating node. In examples, the initiating node may send a probe message that includes a request for identification data associated with a terminating node. The terminating node may send a probe reply message that includes the identification data, as well as, in some examples, a code that instructs the initiating node to perform validation. In examples, the initiating node may use the validation data stored in memory to compare to the identification data received from the terminating node to validate data-plane connectivity. In some examples, the initiating node may indicate a positive or negative response after performing the validation.

公开(公告)号：US10932136B2

公开(公告)日：2021-02-23

申请号：US16456616

申请日：2019-06-28

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Zafar Ali ,  Pablo Camarillo Garvia

IPC: H04W16/02 ,  H04L12/24 ,  H04L12/721 ,  H04L12/863 ,  H04L12/911

Abstract: Resource rationing for network slices in segment routing networks may be provided. A network slice may be created in a communication network. A portion of network resource may be dedicated to the network slice. The dedicated portion of network resource may be bound to the network slice using a segment identifier. The segment identifier may be advertised to the communication network. Data packets associated with the network slice may be routed using the dedicated portion of network resource.

公开(公告)号：US20200244588A1

公开(公告)日：2020-07-30

申请号：US16825168

申请日：2020-03-20

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Zafar Ali ,  Pablo Camarillo Garvia ,  Francois Clad

IPC: H04L12/863 ,  H04L12/911 ,  H04L12/851 ,  H04L12/801 ,  H04L12/26

Abstract: The present technology is directed to a system and method for implementing network resource partitioning and Quality of Service (QoS) separation through network slicing. Embodiments of the present invention describe scalable network slicing method based on defining Segment Routing Flexible Algorithm to represent a network slice and assigning a distinct QoS policy queue to each of the Flexible Algorithms configured on a network node. Therefore, scalable network slice based queuing is implemented wherein a single packet processing queue is assigned to each Flex-Algorithm based network slice. QoS policy queue may be implemented in a hierarchical fashion by differentiation between flow packets in a single QoS policy queue based on value of experimental bits in the header.