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    Communicating packets across multi-domain networks using compact forwarding instructions
    11.
    发明授权
    Communicating packets across multi-domain networks using compact forwarding instructions 有权

    公开(公告)号：US11722404B2

    公开(公告)日：2023-08-08

    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

    CPC classification number: H04L45/34 ,  H04L45/04 ,  H04L69/22

    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.

    PERFORMANCE MEASUREMENT, TELEMETRY, AND OAM IN MPLS NETWORKS USING ENTROPY LABELS
    15.
    发明申请
    PERFORMANCE MEASUREMENT, TELEMETRY, AND OAM IN MPLS NETWORKS USING ENTROPY LABELS 有权

    公开(公告)号：US20230031423A1

    公开(公告)日：2023-02-02

    申请号：US17565823

    申请日：2021-12-30

    Applicant: Cisco Technology, Inc.

    Inventor： Rakesh Gandhi ,  Clarence Filsfils

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

    Abstract: Techniques are described 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.

    Circuit-Style Network with Co-Routed Bidirectional Network Paths
    16.
    发明申请
    Circuit-Style Network with Co-Routed Bidirectional Network Paths 有权

    公开(公告)号：US20230021278A1

    公开(公告)日：2023-01-19

    申请号：US17741241

    申请日：2022-05-10

    Applicant: Cisco Technology, Inc.

    Inventor： Clarence Filsfils ,  Zafar Ali ,  Francois Clad ,  Bertrand Herbert Guy Duvivier ,  Mikhail Koldychev ,  Rakesh Gandhi ,  Sagar Soni

    IPC: H04L45/42 ,  H04L45/00 ,  H04L45/74 ,  H04L45/28

    Abstract: Disclosed are systems, apparatuses, methods, and computer-readable media to implement circuit-style network with co-routed bidirectional network paths. A method includes receiving a request for a circuit policy between a source node and a destination node, the circuit policy defining a co-routed bidirectional policy between the source node and the destination node; requesting a path compute service to identify a path between the source node and the destination node that satisfies the circuit policy through a first network; receiving a path identifying a first set of network nodes that satisfy the circuit policy; configuring each node in the first set of network nodes within the first network with the circuit policy; and establishing a connection using the path that satisfies the circuit policy between the source node and the destination node.

    TELEMETRY DATA OPTIMIZATION FOR PATH TRACING AND DELAY MEASUREMENT
    20.
    发明申请
    TELEMETRY DATA OPTIMIZATION FOR PATH TRACING AND DELAY MEASUREMENT 有权

    公开(公告)号：US20220173992A1

    公开(公告)日：2022-06-02

    申请号：US17344443

    申请日：2021-06-10

    Applicant: Cisco Technology, Inc.

    Inventor： Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Rakesh Gandhi ,  Pablo Camarillo Garvia ,  Francois Clad

    IPC: H04L12/26 ,  H04L12/24

    Abstract: Techniques for optimizing technologies related to network path tracing and network delay measurements are described herein. Some of the techniques may include using an IPv6 header option and/or segment identifier field of a segment list or a TLV of a segment routing header as a telemetry data carrier. The techniques may also include using an SRv6 micro-segment (uSID) instruction to indicate to a node of a network that the node is to perform one or more path tracing actions and encapsulating the packet and forward. Additionally, the techniques may include using short interface identifiers corresponding to node interfaces to trace a packet path through a network. Further, the techniques may include using short timestamps to determine delay measurements associated with sending a packet through a network. In various examples, the techniques described above and herein may be used with each other to optimize network path tracing and delay measurement techniques.

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