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    NETWORK PATH DETECTION AND MONITORING
    1.
    发明申请
    NETWORK PATH DETECTION AND MONITORING 有权

    公开(公告)号：US20250062984A1

    公开(公告)日：2025-02-20

    申请号：US18934224

    申请日：2024-10-31

    Applicant: Cisco Technology, Inc.

    Inventor： Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Rakesh Gandhi ,  Jisu Bhattacharya ,  Pablo Camarillo Garvia

    IPC: H04L45/24 ,  H04L43/10 ,  H04L45/00 ,  H04L45/02 ,  H04L45/50 ,  H04L47/32

    Abstract: This disclosure describes techniques for detecting and monitoring paths in a network. The techniques include causing a source node to generate probe packets to traverse a multi-protocol label switching (MPLS) network, for instance. In some examples, the probe packets include entropy values that correspond to individual equal-cost multi-path (ECMP) paths of the network. The probe packets may be received at an SDN controller from a sink node after traversing the network. Analysis of the probe packets allow path discovery and mapping of the entropy values to ECMP paths. The mapping of discovered paths may be used for optimization of network monitoring activities, including second subsequent probe packets over particular ECMP paths based on the mapped entropy values.

    Network path detection and monitoring
    2.
    发明授权
    Network path detection and monitoring 有权

    公开(公告)号：US12206573B2

    公开(公告)日：2025-01-21

    申请号：US17691016

    申请日：2022-03-09

    Applicant: Cisco Technology, Inc.

    Inventor： Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Rakesh Gandhi ,  Jisu Bhattacharya ,  Pablo Camarillo Garvia

    IPC: H04L45/24 ,  H04L43/10 ,  H04L45/00 ,  H04L45/02 ,  H04L45/50 ,  H04L47/32

    Abstract: This disclosure describes techniques for detecting and monitoring paths in a network. The techniques include causing a source node to generate probe packets to traverse a multi-protocol label switching (MPLS) network, for instance. In some examples, the probe packets include entropy values that correspond to individual equal-cost multi-path (ECMP) paths of the network. The probe packets may be received at an SDN controller from a sink node after traversing the network. Analysis of the probe packets allow path discovery and mapping of the entropy values to ECMP paths. The mapping of discovered paths may be used for optimization of network monitoring activities, including second subsequent probe packets over particular ECMP paths based on the mapped entropy values.

    Performance measurement, telemetry, and OAM in MPLS networks using entropy labels
    3.
    发明授权
    Performance measurement, telemetry, and OAM in MPLS networks using entropy labels 有权

    公开(公告)号：US12206572B2

    公开(公告)日：2025-01-21

    申请号：US18372587

    申请日：2023-09-25

    Applicant: Cisco Technology, Inc.

    Inventor： Rakesh Gandhi ,  Clarence Filsfils

    IPC: H04L45/12 ,  H04L43/0852 ,  H04L45/50 ,  H04L12/46

    Abstract: Techniques for utilizing entropy labels of a Multiprotocol Label Switching (MPLS) label stack for performing monitoring operations (e.g., telemetry, performance measurement, OAM, etc.) without altering the MPLS label stack and/or packet path (e.g., ECMP path). The techniques may include determining, by a node of a network, to perform a monitoring operation associated with traffic that is to be sent along a path through the network. In some examples, the node may receive a packet that is to be sent along the path and encapsulate the packet with an MPLS header. The MPLS header may include an entropy label, entropy label indicator, or other label that is capable of carrying a flag indicating the monitoring operation to be performed. The flag may be carried in a TTL field or traffic class field of the label such that the MPLS label stack is not altered to trigger the monitoring operation.

    In-band direct mode performance loss measurement in software defined networks
    6.
    发明授权
    In-band direct mode performance loss measurement in software defined networks 有权

    公开(公告)号：US11184235B2

    公开(公告)日：2021-11-23

    申请号：US16191676

    申请日：2018-11-15

    Applicant: Cisco Technology, Inc.

    Inventor： Clarence Filsfils ,  Rakesh Gandhi ,  Zafar Ali

    IPC: H04L12/24 ,  H04L12/26 ,  H04L12/851 ,  H04L12/715 ,  H04L12/707 ,  H04L29/06

    Abstract: Mechanisms are provided for “direct mode” (in-band) performance loss measurement in computer networks where packet loss is measured directly in the data plane using techniques based on ECMP paths. Counters on each of an ingress node and an egress node are configured by a network controller to count traffic for indicators associated with different equal-cost multi-path (ECMP) paths through a network between ingress and egress nodes. Each indicator is toggled on or off during a measurement interval during which traffic is measured by the traffic counters on the ingress and egress nodes for each ECMP path. The traffic counters (measured in bytes/packets) from the ingress and egress nodes are sent via event driven telemetry to the network controller for performance loss measurement determination.

    IN-SITU PASSIVE PERFORMANCE MEASUREMENT IN A NETWORK ENVIRONMENT
    7.
    发明申请
    IN-SITU PASSIVE PERFORMANCE MEASUREMENT IN A NETWORK ENVIRONMENT 有权

    公开(公告)号：US20210111999A1

    公开(公告)日：2021-04-15

    申请号：US17130336

    申请日：2020-12-22

    Applicant: Cisco Technology, Inc.

    Inventor： Rakesh Gandhi ,  Clarence Filsfils ,  Sagar Soni ,  Patrick Khordoc

    IPC: H04L12/721 ,  H04L12/723 ,  H04L29/06 ,  H04L12/26 ,  H04L12/813 ,  H04L12/741

    Abstract: Techniques for in-situ passive performance measurement are described. In one embodiment, a method includes receiving a data packet at a first network element, determining whether measurement information is to be collected for the data packet, providing one or more measurement fields for the data packet based on a determination that measurement information is to be collected for the data packet in which at least one measurement field identifies a measurement type, and forwarding the data packet to a second network element. The method further includes determining, by the second network element, the measurement type for the data packet, and performing one or more actions based on the measurement type.

    SCALABLE DISTRIBUTED END-TO-END PERFORMANCE DELAY MEASUREMENT FOR SEGMENT ROUTING POLICIES
    8.
    发明申请
    SCALABLE DISTRIBUTED END-TO-END PERFORMANCE DELAY MEASUREMENT FOR SEGMENT ROUTING POLICIES 审中-公开

    公开(公告)号：US20200076719A1

    公开(公告)日：2020-03-05

    申请号：US16280962

    申请日：2019-02-20

    Applicant: Cisco Technology, Inc.

    Inventor： Clarence Filsfils ,  Rakesh Gandhi ,  Tarek Saad ,  Sagar Soni ,  Patrick Khordoc

    IPC: H04L12/26 ,  H04L12/44

    Abstract: The present technology is directed to a scalable solution for end-to-end performance delay measurement for Segment Routing Policies on both SR-MPLS and SRv6 data planes. The scalability of the solution stems from the use of distributed PM sessions along SR Policy ECMP paths. This is achieved by dividing the SR policy into smaller sections comprised of SPT trees or sub-paths, each of which is associated with a Root-Node. Downstream SID List TLVs may be used in Probe query messages for signaling SPT information to the Root-Nodes Alternatively, this SPT signaling may be accomplished by using a centralized controller. Root-Nodes are responsible for dynamically creating PM sessions and measuring delay metrics for their associated SPT tree section. The root-nodes then send the delay metrics for their local section to an ingress PE node or to a centralized controller using delay metric TLV field of the response message.

    In-situ operation, administration, and maintenance in segment routing with multiprotocol label switching networks
    10.
    发明授权
    In-situ operation, administration, and maintenance in segment routing with multiprotocol label switching networks 有权

    公开(公告)号：US12184543B2

    公开(公告)日：2024-12-31

    申请号：US17239003

    申请日：2021-04-23

    Applicant: Cisco Technology, Inc.

    Inventor： Rakesh Gandhi ,  Sagar Soni ,  Patrick Khordoc

    IPC: H04L69/22 ,  H04L41/142 ,  H04L45/24 ,  H04L45/50

    Abstract: Presented herein is an “In-situ OAM” (IOAM) mechanism that uses a Segment Routing-Multiprotocol Label Switching (SR-MPLS) IOAM segment identifier that can selectively collect IOAM data from “target” network nodes along a data packet path. In one embodiment, a method includes receiving, at a first network node in the SR-MPLS network, a data packet that includes an MPLS label stack comprising a plurality of segment identifiers (SIDs) associated with a plurality of network nodes. The MPLS label stack includes a first SID associated with the first network node. The method includes determining whether the first SID is an IOAM SID or a regular SID. Upon determining that the first SID is the IOAM SID, the method includes implementing an IOAM function at the first network node. Upon determining that the first SID is the regular SID, the method includes processing the data packet without implementing an IOAM function.

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