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    Seamless segment routing
    52.
    发明授权
    Seamless segment routing 有权

    公开(公告)号：US10164838B2

    公开(公告)日：2018-12-25

    申请号：US15639398

    申请日：2017-06-30

    Applicant: Cisco Technology, Inc.

    Inventor： Clarence Filsfils ,  David D. Ward ,  Stewart F. Bryant ,  Daniel C. Frost ,  Nagendra Kumar Nainar ,  Carlos M. Pignataro

    IPC: H04L12/715 ,  H04L12/24 ,  H04L12/721 ,  H04L12/723 ,  H04L12/741 ,  H04L12/931 ,  H04L12/46 ,  H04L12/913

    Abstract: A method, network device, and computer readable medium are disclosed. In one embodiment of the method, a data packet is received at a node within a first segment routing enabled access network. The first access network is connected, via a first area edge node, to a first area of a subdivided segment routing enabled network, and a specified destination for the data packet is reachable via a second segment routing enabled access network connected to the subdivided network. The method embodiment further includes receiving from a centralized controller a remote segment identifier stack, where the remote segment identifier stack encodes a path extending from the first area edge node to the second access network. The embodiment of the method continues with encapsulating the data packet with a full segment identifier stack comprising the remote segment identifier stack, and forwarding the encapsulated data packet toward the first area edge node.

    Seamless path monitoring and rapid fault isolation using bidirectional forwarding detection in a network environment
    58.
    发明授权
    Seamless path monitoring and rapid fault isolation using bidirectional forwarding detection in a network environment 有权
    在网络环境中使用双向转发检测实现无缝路径监控和快速故障隔离

    公开(公告)号：US09497107B1

    公开(公告)日：2016-11-15

    申请号：US14211710

    申请日：2014-03-14

    Applicant: CISCO TECHNOLOGY, INC.

    Inventor： Nobushige Akiya ,  David D. Ward ,  Carlos M. Pignataro ,  Nagendra Kumar Nainar ,  Tarek Saad ,  Muthurajah Sivabalan

    IPC: H04L12/707

    CPC classification number: H04L45/22 ,  H04L41/0677 ,  H04L43/0811 ,  H04L43/10 ,  H04L45/50

    Abstract: An example method for seamless path monitoring and rapid fault isolation using bidirectional forwarding detection (BFD) in a network environment is provided and includes determining a BFD target identifier type for communicating in a BFD session in a network environment, determining a non-zero globally assigned BFD discriminator value associated with the BFD target identifier type, populating a Your Discriminator field in a BFD Control Packet with the non-zero globally assigned BFD discriminator value, with a My Discriminator field in the BFD Control Packet being populated with a locally assigned BFD Discriminator value, and initiating the BFD session by transmitting the BFD Control Packet to a target node in the network. In a specific embodiment, the BFD target identifier type is type 3, and the non-zero globally assigned BFD discriminator is an Alert Discriminator reserved by substantially all nodes in the network exclusively for BFD traceroute operations.

    Abstract translation: 提供了一种在网络环境中使用双向转发检测（BFD）进行无缝路径监控和快速故障隔离的示例方法，包括确定BFD目标标识符类型，以在网络环境中的BFD会话中进行通信，确定非零全局分配 与BFD目标标识符类型相关联的BFD鉴别符值，在BFD控制报文中填入非零全局分配BFD鉴别符值的“Discriminator”字段，BFD控制报文中的“我的标识符”字段填入本地分配的BFD鉴别符 通过将BFD控制报文发送到网络中的目标节点来启动BFD会话。 在具体实施例中，BFD目标标识符类型为类型3，非零全局分配的BFD鉴别器是专门用于BFD跟踪路由操作的网络中基本上所有节点保留的警报鉴别器。

    Operating MPLS label switched paths and MPLS pseudowire in loopback mode
    59.
    发明授权
    Operating MPLS label switched paths and MPLS pseudowire in loopback mode 有权
    在环回模式下运行MPLS标签交换路径和MPLS伪线

    公开(公告)号：US09419885B2

    公开(公告)日：2016-08-16

    申请号：US13770624

    申请日：2013-02-19

    Applicant: Cisco Technology, Inc.

    Inventor： Sami Boutros ,  Muthurajah Sivabalan ,  David D. Ward ,  George Swallow ,  Carlos M. Pignataro

    IPC: H04L12/26 ,  H04L12/701 ,  H04L12/733 ,  H04L12/723 ,  H04L12/721

    CPC classification number: H04L43/50 ,  H04L45/00 ,  H04L45/20 ,  H04L45/50 ,  H04L45/68

    Abstract: In one embodiment, a circuit that extends between a head-end label switching router (LSR) and a tail-end LSR and traverses one or more intermediate LSRs is locked to data plane traffic. The head-end LSR transmits a packet along the circuit that includes a particular time-to-live (TTL) value configured to expire at a particular intermediate LSR at which loopback is to occur. The circuit is used in a loopback mode. The head-end LSR transmits along the circuit a packet that includes a cease loopback request. The circuit ceases to be used in the loopback mode. The circuit is unlocked to permit the circuit to pass data plane traffic.

    Abstract translation: 在一个实施例中，在头端标签交换路由器（LSR）和尾端LSR之间延伸并且遍历一个或多个中间LSR的电路被锁定到数据平面业务。 前端LSR沿着电路发送包括特定生存时间（TTL）值的数据包，配置为在发生环回的特定中间LSR处到期。 该电路用于环回模式。 前端LSR沿着电路传输包括停止回送请求的数据包。 电路不再用于环回模式。 电路被解锁以允许电路通过数据平面流量。

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