公开(公告)号：US20170054626A1

公开(公告)日：2017-02-23

申请号：US14832888

申请日：2015-08-21

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Muthurajah Sivabalan ,  Sami Boutros ,  Peter Psenak ,  Rex Emmanuel Fernando ,  Clarence Filsfils

IPC: H04L12/755 ,  H04L12/707 ,  H04L12/46

CPC classification number: H04L45/021 ,  H04L12/4662 ,  H04L45/22 ,  H04L45/64

Abstract: A method and system are disclosed for distributing (advertising) segment identifiers in network functions virtualization and/or software defined networking environments. An exemplary method includes receiving a route advertisement that includes a prefix with a forwarding address for a first network element and receiving a segment identifier (SID) advertisement that includes a prefix SID for the prefix. The route advertisement may be received from a second network element proxying control plane functions for the first network element. Reachability information for the first network element is updated based on the route advertisement and the SID advertisement.

Abstract translation: 公开了用于在网络功能虚拟化和/或软件定义的网络环境中分发（广告）段标识符的方法和系统。 一种示例性方法包括：接收包括具有第一网络元件的转发地址的前缀的路由通告，并且接收包括前缀的前缀SID的段标识符（SID）通告。 路由通告可以从第二网络元件接收用于第一网络元件的代理控制平面功能。 基于路由广告和SID广告来更新第一网元的可达性信息。

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。

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。

公开(公告)号：US09083553B2

公开(公告)日：2015-07-14

申请号：US14299912

申请日：2014-06-09

Applicant: Cisco Technology, Inc.

Inventor： Rakesh Gandhi ,  Muthurajah Sivabalan

IPC: H04L12/46 ,  H04L12/913

CPC classification number: H04L47/724 ,  H04L12/4633 ,  H04L45/36 ,  H04L45/50 ,  H04L47/825

Abstract: Particular embodiments may enable setup and signaling of co-routed and non co-routed label switched paths (LSPs) of a bidirectional packet traffic engineering (TE) tunnel in an unambiguous manner with respect to provisioning of the LSPs/tunnel. A head-end node may set up the bidirectional packet TE tunnel by computing a forward (and possibly a reverse) direction LSP, and then signal the bidirectional TE tunnel utilizing, e.g., extensions to an associated Resource Reservation Protocol (RSVP) signaling method. The extensions to the associated RSVP signaling method include a plurality of additional Association Types of an Extended Association object carried in a RSVP Path message transmitted by the head-end node to the tail-end node over the forward direction LSP, wherein the additional Association Types explicitly identify the provisioning of the forward and reverse direction LSPs as co-routed or non co-routed.

Abstract translation: 具体实施例可以使得能够以相对于LSP /隧道的提供的明确方式建立和发送双向分组流量工程（TE）隧道的共路由和非共路由标签交换路径（LSP）。 前端节点可以通过计算前向（可能是反向）LSP来建立双向分组TE隧道，然后利用例如关联的资源预留协议（RSVP）信令方法的扩展来向双向TE隧道发信号。 相关RSVP信令方法的扩展包括由前端节点通过前向LSP发送到尾端节点的RSVP路径消息中携带的扩展关联对象的多个附加关联类型，其中附加关联类型 明确地将前向和反向LSP的配置标识为共路由或非共路由。

公开(公告)号：US08976682B2

公开(公告)日：2015-03-10

申请号：US13760854

申请日：2013-02-06

Applicant: Cisco Technology, Inc.

Inventor： Sami Boutros ,  Muthurajah Sivabalan ,  David D. Ward ,  George Swallow ,  Stewart Frederick Bryant ,  Ian Michael Charles Shand

IPC: H04L12/24 ,  H04L12/26 ,  H04L12/721 ,  H04L12/703 ,  H04L12/723 ,  H04L12/801

CPC classification number: H04L12/2419 ,  H04L41/06 ,  H04L43/0811 ,  H04L45/26 ,  H04L45/28 ,  H04L45/50 ,  H04L47/10

Abstract: In one embodiment, a maintenance intermediate point (MIP) receives a packet traveling along a multi-protocol label switching (MPLS) label switched path (LSP) that extends from a first maintenance end point (MEP) to a second MEP. The receiving MIP decrements a time-to-live (TTL) value in a header of the packet. In response the TTL value in the header of the packet equaling a particular value, the receiving MIP examines an associated channel header (ACH) field in an operations, administration, and maintenance (OAM) message stored in a payload of the packet, and determines a particular OAM function to perform based on a code in the ACH field. The receiving MIP performs the particular OAM function.

Abstract translation: 在一个实施例中，维护中间点（MIP）接收沿着从第一维护终点（MEP）延伸到第二MEP的多协议标签交换（MPLS）标签交换路径（LSP）行进的分组。 接收MIP减少分组报头中的生存时间（TTL）值。 响应于等于特定值的分组的报头中的TTL值，接收MIP检查存储在分组的有效载荷中的操作，管理和维护（OAM）消息中的相关联的信道报头（ACH）字段，并且确定 基于ACH字段中的代码执行的特定OAM功能。 接收MIP执行特定的OAM功能。

公开(公告)号：US20140286341A1

公开(公告)日：2014-09-25

申请号：US14299912

申请日：2014-06-09

Applicant: Cisco Technology, Inc.

Inventor： Rakesh Gandhi ,  Muthurajah Sivabalan

IPC: H04L12/46 ,  H04L12/913

CPC classification number: H04L47/724 ,  H04L12/4633 ,  H04L45/36 ,  H04L45/50 ,  H04L47/825

Abstract: Particular embodiments may enable setup and signaling of co-routed and non co-routed label switched paths (LSPs) of a bidirectional packet traffic engineering (TE) tunnel in an unambiguous manner with respect to provisioning of the LSPs/tunnel. A head-end node may set up the bidirectional packet TE tunnel by computing a forward (and possibly a reverse) direction LSP, and then signal the bidirectional TE tunnel utilizing, e.g., extensions to an associated Resource Reservation Protocol (RSVP) signaling method. The extensions to the associated RSVP signaling method include a plurality of additional Association Types of an Extended Association object carried in a RSVP Path message transmitted by the head-end node to the tail-end node over the forward direction LSP, wherein the additional Association Types explicitly identify the provisioning of the forward and reverse direction LSPs as co-routed or non co-routed.

公开(公告)号：US20130155877A1

公开(公告)日：2013-06-20

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

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。

公开(公告)号：US10567295B2

公开(公告)日：2020-02-18

申请号：US15982935

申请日：2018-05-17

Applicant: Cisco Technology, Inc.

Inventor： Robert Barton ,  Maik Guenter Seewald ,  Michael Alan Kowal ,  Muthurajah Sivabalan ,  Jerome Henry

IPC: H04L12/841 ,  H04L12/24 ,  H04L12/26 ,  H04B7/14

Abstract: A method for teleprotection over a segment routed network comprises receiving network requirements for communication between a first teleprotection relay and a second teleprotection relay, the first teleprotection relay associated with a first router of the segment routed network, and the second teleprotection relay associated with a second router of the segment routed network, identifying a primary path from the first router to the second router satisfying the network requirements, determining a congruent reverse of the primary path satisfies the network requirements, sending, to the first router, the primary path, the first router routing traffic from the first teleprotection relay to the second teleprotection relay using the primary path, and sending, to the second router, the congruent reverse of the primary path, the second router routing traffic from the second teleprotection relay to the first teleprotection relay using the congruent reverse of the primary path.

公开(公告)号：US20190297017A1

公开(公告)日：2019-09-26

申请号：US15934247

申请日：2018-03-23

Applicant: Cisco Technology, Inc.

Inventor： Carlos M. Pignataro ,  Prashanth Patil ,  Nagendra Kumar Nainar ,  Robert Edgar Barton ,  Jerome Henry ,  Muthurajah Sivabalan

IPC: H04L12/803 ,  H04L12/801 ,  H04L12/26 ,  H04L29/06

Abstract: In one example embodiment, a first path computation element of a first segment routing domain includes a plurality of path computation clients. The first path computation element obtains, from at least one path computation client of the plurality of path computation clients, telemetry data indicating network traffic congestion for the at least one path computation client. Based on the telemetry data, the first path computation element determines that the at least one path computation client is experiencing at least a predetermined amount of network traffic congestion. In response to determining that the at least one path computation client is experiencing at least the predetermined amount of network traffic congestion, the first path computation element sends, to a second path computation element of a second segment routing domain, an indication of the network traffic congestion for the at least one path computation client.

公开(公告)号：US10250494B2

公开(公告)日：2019-04-02

申请号：US15337976

申请日：2016-10-28

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Muthurajah Sivabalan ,  Sami Boutros ,  Clarence Filsfils ,  Rex Emmanuel Fernando ,  Lakshmi Sharma ,  Santiago Vazquez Freitas ,  Bruce McDougall ,  Robert Keith Fielding

IPC: H04L12/28 ,  H04L12/723 ,  H04L12/911 ,  H04L29/12

Abstract: A method is provided in one example embodiment and includes receiving a request to create a path through a network, wherein the path originates on a first network device and terminates on the second network device; identifying a first controller associated with the first network device, wherein the first controller proxies control plane functions for the first network device; identifying a second controller associated with the second network device, wherein the second controller proxies control plane functions for the second network device; and computing the path using the first controller as a source and the second controller as a destination. The first controller installs the computed path on the first network device and the second controller installs the computed path on the second network device.