公开(公告)号：US20150092539A1

公开(公告)日：2015-04-02

申请号：US14041392

申请日：2013-09-30

Applicant: Cisco Technology, Inc.

Inventor： Muthurajah Sivabalan ,  Sami Boutros ,  George Swallow ,  Simon Spraggs

IPC: H04L12/24 ,  H04L12/707 ,  H04L12/703

CPC classification number: H04L45/22 ,  H04L12/42 ,  H04L12/437 ,  H04L45/28 ,  H04L45/50 ,  H04L45/68 ,  H04L47/70 ,  H04L47/746 ,  H04L47/825

Abstract: In one embodiment, a source transmits one or more data packets to a destination over a primary pseudowire (PW). When a device on the primary PW detects a downstream failure of the primary PW, and in response to receiving one or more data packets from a source from the failed primary PW, the device adds a loopback packet identifier to the one or more received data packets, and returns the one or more data packets with the loopback packet identifier to the source upstream on the primary PW. Accordingly, in response to receiving the data packet returned with a loopback packet identifier from the primary PW (in response to the downstream failure), the source retransmits the one or more data packets to the destination over a backup PW.

Abstract translation: 在一个实施例中，源将主要伪线（PW）发送一个或多个数据分组到目的地。 当主PW上的设备检测到主PW的下游故障时，并且响应于从故障主PW接收到来自源的一个或多个数据分组，该设备向一个或多个接收的数据分组添加环回分组标识符 并将具有环回分组标识符的一个或多个数据分组返回到主PW上游源。 因此，响应于从主PW（响应于下游故障）接收到以环回分组标识符返回的数据分组，源通过备份PW将一个或多个数据分组重传到目的地。

公开(公告)号：US20140211629A1

公开(公告)日：2014-07-31

申请号：US14229503

申请日：2014-03-28

Applicant: Cisco Technology, Inc.

Inventor： Sami Boutros ,  Muthurajah Sivabalan ,  David D. Ward ,  Stefano B. Previdi ,  Jean-Philippe Vasseur ,  Rodolphe Figaro ,  Reshad A. Rahman

IPC: H04L12/803

CPC classification number: H04L47/125 ,  H04L41/06 ,  H04L45/00 ,  H04L45/50 ,  H04L47/2408 ,  H04L47/745

Abstract: A system and method for advertising out-of-resources (OOR) conditions for entities, such as nodes, line cards and data links, in a manner that does not involve using a maximum cost to indicate the entity is “out-of-resources.” According to the technique, an OOR condition for an entity is advertised in one or more type-length-value (TLV) objects contained in an advertisement message. The advertisement message is flooded to nodes on a data network to inform them of the entity's OOR condition. Head-end nodes that process the advertisement message may use information contained in the TLV object to determine a path for a new label switched path (LSP) that does not include the entity associated with the OOR condition.

Abstract translation: 用于以不涉及使用最大成本来指示实体的方式向诸如节点，线路卡和数据链路的实体（例如节点，线路卡和数据链路）广告外部资源（OOR）条件的系统和方法是“超出资源 。“根据该技术，实体的OOR条件在广告消息中包含的一个或多个类型长度值（TLV）对象中通告。 广告消息被洪泛到数据网络上的节点，以通知他们实体的OOR条件。 处理广告消息的头端节点可以使用包含在TLV对象中的信息来确定不包括与OOR条件相关联的实体的新标签交换路径（LSP）的路径。

公开(公告)号：US10833976B2

公开(公告)日：2020-11-10

申请号：US16185239

申请日：2018-11-09

Applicant: Cisco Technology, Inc.

Inventor： Tarek Saad ,  Clarence Filsfils ,  Muthurajah Sivabalan

IPC: H04L12/707 ,  H04L12/24 ,  H04L12/751 ,  H04L12/721 ,  H04L12/46 ,  H04L12/815

Abstract: A method is described and in one embodiment includes receiving a packet of a traffic flow at an ingress node of a communications network; routing the packet to an egress node of the communications network via a first path comprising a tunnel if the packet was received from a node external to the communications network; and routing the packet to the egress node of the communications network via a second path that does not traverse the tunnel if the packet was received from a node internal to the communications network. The first path is identified by a first Forwarding Information Base (“FIB”) entry corresponding to the flow and the second path is identified by a second FIB entry corresponding to the flow.

公开(公告)号：US20200153856A1

公开(公告)日：2020-05-14

申请号：US16185168

申请日：2018-11-09

Applicant: Cisco Technology, Inc.

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

IPC: H04L29/06 ,  H04L12/803

Abstract: First data indicative of information that a packet is part of a DDoS attack is received at a management network device. A DDoS remediation network device to be used for remediation of packets associated with the DDoS attack is determined from the first data. Second data, indicative of the DDoS attack and indicative of the DDoS remediation network device, is transmitted from the management network device to an edge network device. The second data is configured to cause the edge network device to route packets associated with the DDoS attack to the DDoS remediation network device.

公开(公告)号：US20190356600A1

公开(公告)日：2019-11-21

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 ,  H04B7/14 ,  H04L12/26

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：US10291516B2

公开(公告)日：2019-05-14

申请号：US15001528

申请日：2016-01-20

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Stewart Frederick Bryant ,  George Swallow ,  Muthurajah Sivabalan

IPC: H04L12/723 ,  H04L12/26

Abstract: Particular embodiments described herein provide for a communication system that can be configured to identify a system that includes network traffic, where at least a portion of the network traffic includes packets, at least a portion of the packets include a stack, and at least a portion of each stack includes one or more previously allocated labels. The communication system can further be configured to determine a synonymous label that triggers an action and to replace a label from the one of the one or more previously allocated labels in a specific stack of a specific packet with the synonymous label. In an example, the synonymous label can be used to identify a subset of packets in the network traffic or a source of the specific packet.

公开(公告)号：US20190081887A1

公开(公告)日：2019-03-14

申请号：US16185239

申请日：2018-11-09

Applicant: Cisco Technology, Inc.

Inventor： Tarek Saad ,  Clarence Filsfils ,  Muthurajah Sivabalan

IPC: H04L12/707 ,  H04L12/815 ,  H04L12/46 ,  H04L12/721

CPC classification number: H04L45/22 ,  H04L12/4633 ,  H04L45/12 ,  H04L47/22

Abstract: A method is described and in one embodiment includes receiving a packet of a traffic flow at an ingress node of a communications network; routing the packet to an egress node of the communications network via a first path comprising a tunnel if the packet was received from a node external to the communications network; and routing the packet to the egress node of the communications network via a second path that does not traverse the tunnel if the packet was received from a node internal to the communications network. The first path is identified by a first Forwarding Information Base (“FIB”) entry corresponding to the flow and the second path is identified by a second FIB entry corresponding to the flow.

公开(公告)号：US09838299B2

公开(公告)日：2017-12-05

申请号：US14309425

申请日：2014-06-19

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Santiago Alvarez ,  Muthurajah Sivabalan

IPC: H04L12/721 ,  H04L12/24 ,  H04L12/725 ,  H04L12/913 ,  H04L12/26

CPC classification number: H04L45/123 ,  H04L41/0803 ,  H04L43/062 ,  H04L45/124 ,  H04L45/30 ,  H04L47/724

Abstract: Methods and systems are disclosed for enabling centralized path definition and policy with distributed path setup, and centralized path setup control with distributed path utilization constraints. In one example, a path computation client (PCC) requests, utilizing opaque PCE profile identifiers, path computation from a path computation element (PCE). The PCE profile identifier corresponds to path computation constraints, stored local to PCE, and are unknown to the PCC. Advantageously, the PCE profile identifiers allow the PCC to initiate path computation requests based on information local the PCC while leveraging centralized computation by the PCE. In another example, a PCE requests, utilizing opaque PCC profile identifiers, that a PCC initiate a path. The PCC profile identifier corresponds to path usage constraints, stored local to PCC, and are unknown to the PCE. Advantageously, the PCC identifiers allow the PCE to marshal path initiation while leveraging distributed resources to enforce compliance with usage parameters.

公开(公告)号：US09722916B2

公开(公告)日：2017-08-01

申请号：US14041392

申请日：2013-09-30

Applicant: Cisco Technology, Inc.

Inventor： Muthurajah Sivabalan ,  Sami Boutros ,  George Swallow ,  Simon Spraggs

IPC: H04L12/707 ,  H04L12/703 ,  H04L12/42 ,  H04L12/911 ,  H04L12/723 ,  H04L12/54 ,  H04L12/437 ,  H04L12/721

CPC classification number: H04L45/22 ,  H04L12/42 ,  H04L12/437 ,  H04L45/28 ,  H04L45/50 ,  H04L45/68 ,  H04L47/70 ,  H04L47/746 ,  H04L47/825

Abstract: In one embodiment, a source transmits one or more data packets to a destination over a primary pseudowire (PW). When a device on the primary PW detects a downstream failure of the primary PW, and in response to receiving one or more data packets from a source from the failed primary PW, the device adds a loopback packet identifier to the one or more received data packets, and returns the one or more data packets with the loopback packet identifier to the source upstream on the primary PW. Accordingly, in response to receiving the data packet returned with a loopback packet identifier from the primary PW (in response to the downstream failure), the source retransmits the one or more data packets to the destination over a backup PW.

公开(公告)号：US09537753B2

公开(公告)日：2017-01-03

申请号：US14304439

申请日：2014-06-13

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Santiago Alvarez ,  Muthurajah Sivabalan

IPC: H04L12/721 ,  H04L12/24 ,  H04L12/913 ,  H04L12/26

CPC classification number: H04L45/123 ,  H04L41/0803 ,  H04L43/062 ,  H04L45/124 ,  H04L45/30 ,  H04L47/724

Abstract: Methods and systems are disclosed for enabling centralized path definition and policy with distributed path setup, and centralized path setup control with distributed path utilization constraints. In one example, a path computation client (PCC) requests, utilizing opaque PCE profile identifiers, a path computation from a path computation element (PCE). The PCE profile identifier corresponds to path computation constraints, stored local to PCE, and are unknown to the PCC. Advantageously, the PCE profile identifiers allow the PCC to initiate path computation requests based on information local the PCC while leveraging centralized path computation by the PCE. In another example, a PCE requests, utilizing opaque PCC profile identifiers, that a PCC initiate a path. The PCC profile identifier corresponds to path usage parameter constraints, stored local to PCC, and are unknown to the PCE. Advantageously, the PCC identifiers allow the PCE to marshal path initiation while leveraging distributed resources to enforce compliance with usage parameters.

Abstract translation: 公开了用于实现具有分布式路径建立的集中路径定义和策略以及具有分布式路径利用约束的集中路径设置控制的方法和系统。 在一个示例中，路径计算客户端（PCC）使用不透明PCE简档标识符从路径计算元件（PCE）请求路径计算。 PCE配置文件标识符对应于PCE本地存储的路径计算约束，并且对于PCC是未知的。 有利地，PCE简档标识符允许PCC基于PCC本地的信息来发起路径计算请求，同时利用PCE的集中路径计算。 在另一示例中，PCE使用不透明的PCC简档标识符来请求PCC发起路径。 PCC配置文件标识符对应于PCC本地存储的路径使用参数约束，并且对于PCE是未知的。 有利地，PCC标识符允许PCE调度路径启动，同时利用分布式资源来强制遵守使用参数。