公开(公告)号：US20080247324A1

公开(公告)日：2008-10-09

申请号：US11697571

申请日：2007-04-06

申请人： Thomas D. Nadeau ,  Danny Prairie ,  George Swallow ,  Reshad Rahman

发明人： Thomas D. Nadeau ,  Danny Prairie ,  George Swallow ,  Reshad Rahman

IPC分类号： H04L12/26

CPC分类号： H04L41/12 ,  H04L45/02 ,  H04L45/28 ,  H04L45/50

摘要： Improved detection of specific BFD LSP path failures is herein disclosed. The improved detection described herein allow for faster fault isolation of a failure along a LSP path, which in turn may allow for faster repair of the failure. When opening a BFD session with a LSP egress node, the LSP ingress node provides the LSP egress node a path descriptor along with the BFD Discriminator. If a BFD failure is detected at the LSP egress node, the LSP egress node can signal an alarm that includes a full description of the path.

摘要翻译： 本文公开了对特定BFD LSP路径故障的改进的检测。 这里描述的改进的检测允许沿着LSP路径的故障的更快的故障隔离，这进而可以允许更快地修复故障。 当与LSP出口节点打开BFD会话时，LSP入口节点向LSP出口节点提供与BFD鉴别器一起的路径描述符。 如果在LSP出口节点检测到BFD故障，则LSP出口节点可以发出包含路径完整描述的告警信号。

公开(公告)号：US08374164B2

公开(公告)日：2013-02-12

申请号：US11697571

申请日：2007-04-06

申请人： Thomas D. Nadeau ,  Danny Prairie ,  George Swallow ,  Reshad Rahman

发明人： Thomas D. Nadeau ,  Danny Prairie ,  George Swallow ,  Reshad Rahman

IPC分类号： G01R31/08 ,  H04L12/28

CPC分类号： H04L41/12 ,  H04L45/02 ,  H04L45/28 ,  H04L45/50

摘要： Improved detection of specific BFD LSP path failures is herein disclosed. The improved detection described herein allow for faster fault isolation of a failure along a LSP path, which in turn may allow for faster repair of the failure. When opening a BFD session with a LSP egress node, the LSP ingress node provides the LSP egress node a path descriptor along with the BFD Discriminator. If a BFD failure is detected at the LSP egress node, the LSP egress node can signal an alarm that includes a full description of the path.

摘要翻译： 本文公开了对特定BFD LSP路径故障的改进的检测。 这里描述的改进的检测允许沿着LSP路径的故障的更快的故障隔离，这进而可以允许更快地修复故障。 当与LSP出口节点打开BFD会话时，LSP入口节点向LSP出口节点提供与BFD鉴别器一起的路径描述符。 如果在LSP出口节点检测到BFD故障，则LSP出口节点可以发出包含路径完整描述的告警信号。

公开(公告)号：US20120257629A1

公开(公告)日：2012-10-11

申请号：US13084531

申请日：2011-04-11

申请人： Vijayan Ramakrishnan ,  Sami Boutros ,  Leo Chun-Chuen Chan ,  Reshad Rahman ,  Sundar Siddaramaiah Bettadahalli ,  Sivakumar Subramaniyan Ganapathy

发明人： Vijayan Ramakrishnan ,  Sami Boutros ,  Leo Chun-Chuen Chan ,  Reshad Rahman ,  Sundar Siddaramaiah Bettadahalli ,  Sivakumar Subramaniyan Ganapathy

IPC分类号： H04L12/56

CPC分类号： H04L45/68

摘要： In one embodiment, line cards of packet switching or other network devices are configured for terminating pseudowires. Typically, this includes multiple line cards being configured for terminating a same pseudowire, which allows the corresponding pseudowire traffic to be received by any one of these multiple line cards. Each of these pseudowire-terminating line cards is typically configured to apply one or more features to a pseudowire packet. Examples of these features include, but are not limited to: Access Control List, Quality of Service, Netflow, and Lawful Intercept. For a received packet to be sent out one of these pseudowires, a two-stage lookup operation can be used to first identify the pseudowire over which to forward the packet; and a second lookup operation based on the pseudowire to identify forwarding information corresponding to a path through a network over which a corresponding pseudowire is configured.

摘要翻译： 在一个实施例中，分组交换或其他网络设备的线路卡被配置用于终止伪线。 通常，这包括配置用于终止相同伪线的多个线卡，这允许相应的伪线路业务由这些多个线卡中的任一个接收。 这些伪线终端线卡中的每一个通常被配置为将一个或多个特征应用于伪线分组。 这些功能的示例包括但不限于：访问控制列表，服务质量，Netflow和合法拦截。 对于要发送出这些伪线中的一个的接收分组，可以使用两阶段查找操作来首先识别用于转发分组的伪线; 以及基于伪线的第二查找操作，以识别与通过其配置相应伪线的网络相对应的路径的转发信息。

公开(公告)号：US07680028B1

公开(公告)日：2010-03-16

申请号：US10718784

申请日：2003-11-21

申请人： Anca Zamfir ,  Junaid Israr ,  Reshad Rahman

发明人： Anca Zamfir ,  Junaid Israr ,  Reshad Rahman

IPC分类号： H04L12/26

CPC分类号： H04L47/825 ,  H04L47/70 ,  H04L47/724 ,  H04L47/746

摘要： An RSVP node that has crashed and restarted sends a non-zero Recovery Time value in a Restart_Cap object of a Hello message. Other nodes receiving such messages can detect, based on the non-zero Recovery Time value, that the sending node is restarting. In particular, a first RSVP node can detect whether a second, neighbor node has restarted regardless of the order of restart with respect to the first and second nodes. As a result, the first node can determine whether to forward PATH messages with Recovery Label or Suggested Label, as appropriate or necessary to rebuild label-switched paths with crashed and restarted nodes. Therefore, when multiple RSVP nodes crash relatively concurrently, the multiple nodes can restart gracefully and automatically detect what kind of communication to use in order to rebuild label-switched paths among themselves.

摘要翻译： 已经崩溃并重新启动的RSVP节点在Hello消息的Restart_Cap对象中发送非零恢复时间值。 接收这种消息的其他节点可以基于非零恢复时间值来检测发送节点正在重新启动。 特别地，第一RSVP节点可以检测第二个相邻节点是否已经重新启动，而不管相对于第一和第二节点的重启次序。 因此，第一个节点可以根据需要确定是否使用恢复标签或建议标签转发PATH消息，以重建具有崩溃和重新启动的节点的标签交换路径。 因此，当多个RSVP节点相对并发崩溃时，多个节点可以正常重启并自动检测要使用什么样的通信，以便在它们之间重建标签交换路径。

公开(公告)号：US20090010171A1

公开(公告)日：2009-01-08

申请号：US11825389

申请日：2007-07-05

申请人： Puneet Gupta ,  Sunil K. Srivastava ,  David Ward ,  Reshad Rahman ,  David Toscano

发明人： Puneet Gupta ,  Sunil K. Srivastava ,  David Ward ,  Reshad Rahman ,  David Toscano

IPC分类号： H04L12/26

CPC分类号： H04L41/0659 ,  H04L41/0631

摘要： In one embodiment, an apparatus includes a physical port and a plurality of logical sub-interfaces under the physical port. The physical port and the logical sub-interfaces are configured as a Bidirectional Forwarding Detection (BFD) neighbor group. The physical port being configured to run BFD sessions to detect failures at a first rate that is substantially faster as compared to a second rate of BFD sessions to detect failures on the logical sub-interfaces. The physical port notifies the logical sub-interfaces of a BFD failure at the physical port, with the logical sub-interfaces shutting down responsive to the notification. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.

摘要翻译： 在一个实施例中，装置包括物理端口和物理端口下的多个逻辑子接口。 物理端口和逻辑子接口配置为双向转发检测（BFD）邻居组。 物理端口被配置为运行BFD会话，以与第二速率的BFD会话相比快速地检测故障，以检测逻辑子接口上的故障。 物理端口在物理端口通知逻辑子接口发生BFD故障，逻辑子接口响应通知关闭。 要强调的是，该摘要被提供以符合要求抽象的规则，允许搜索者或其他读者快速确定技术公开内容的主题。

公开(公告)号：US20060092952A1

公开(公告)日：2006-05-04

申请号：US10964184

申请日：2004-10-13

申请人： Sami Boutros ,  Muthurajah Sivabalan ,  David Ward ,  Stefano Previdi ,  Jean-Philippe Vasseur ,  Rodolphe Figaro ,  Reshad Rahman

发明人： Sami Boutros ,  Muthurajah Sivabalan ,  David Ward ,  Stefano Previdi ,  Jean-Philippe Vasseur ,  Rodolphe Figaro ,  Reshad Rahman

IPC分类号： H04L12/56

CPC分类号： H04L47/125 ,  H04L41/06 ,  H04L45/00 ,  H04L45/50 ,  H04L47/2408 ,  H04L47/745

摘要： 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.

摘要翻译： 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，在广告消息中包含的一个或多个类型长度值（TLV）对象中通告实体的OOR条件。 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：US08848716B2

公开(公告)日：2014-09-30

申请号：US13084531

申请日：2011-04-11

申请人： Vijayan Ramakrishnan ,  Sami Boutros ,  Leo Chun-Chuen Chan ,  Reshad Rahman ,  Sundar Siddaramaiah Bettadahalli ,  Sivakumar Subramaniyan Ganapathy

发明人： Vijayan Ramakrishnan ,  Sami Boutros ,  Leo Chun-Chuen Chan ,  Reshad Rahman ,  Sundar Siddaramaiah Bettadahalli ,  Sivakumar Subramaniyan Ganapathy

IPC分类号： H04L12/28 ,  H04L12/56 ,  G06F15/16

CPC分类号： H04L45/68

摘要： In one embodiment, line cards of packet switching or other network devices are configured for terminating pseudowires. Typically, this includes multiple line cards being configured for terminating a same pseudowire, which allows the corresponding pseudowire traffic to be received by any one of these multiple line cards. Each of these pseudowire-terminating line cards is typically configured to apply one or more features to a pseudowire packet. Examples of these features include, but are not limited to: Access Control List, Quality of Service, Netflow, and Lawful Intercept. For a received packet to be sent out one of these pseudowires, a two-stage lookup operation can be used to first identify the pseudowire over which to forward the packet; and a second lookup operation based on the pseudowire to identify forwarding information corresponding to a path through a network over which a corresponding pseudowire is configured.

摘要翻译： 在一个实施例中，分组交换或其他网络设备的线路卡被配置用于终止伪线。 通常，这包括配置用于终止相同伪线的多个线卡，这允许相应的伪线路业务由这些多个线卡中的任一个接收。 这些伪线终端线卡中的每一个通常被配置为将一个或多个特征应用于伪线分组。 这些功能的示例包括但不限于：访问控制列表，服务质量，Netflow和合法拦截。 对于要发送出这些伪线中的一个的接收分组，可以使用两阶段查找操作来首先识别用于转发分组的伪线; 以及基于伪线的第二查找操作，以识别与通过其配置相应伪线的网络相对应的路径的转发信息。

公开(公告)号：US20060209685A1

公开(公告)日：2006-09-21

申请号：US11083471

申请日：2005-03-18

申请人： Reshad Rahman ,  David Toscano ,  David Ward ,  Jean-Marc Simard ,  Christian Hopps

发明人： Reshad Rahman ,  David Toscano ,  David Ward ,  Jean-Marc Simard ,  Christian Hopps

IPC分类号： H04J1/16 ,  H04L12/26 ,  H04L1/00

CPC分类号： H04L43/50

摘要： A system and method for bidirectional forwarding detection (BFD) rate-limiting and automatic BFD session activation includes tracking a total bidirectional forwarding detection (BFD) packet rate for a line card (LC) of the node, and rejecting operations associated with creation of a new BFD session that would cause the total BFD packet rate to exceed a predetermined maximum rate. The new BFD session is stored in a state on the node and the operations of the new BFD session are automatically retried at a time when doing so would not exceed the predetermined maximum rate. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

公开(公告)号：US08289839B2

公开(公告)日：2012-10-16

申请号：US11825389

申请日：2007-07-05

申请人： Puneet Gupta ,  Sunil K. Srivastava ,  David Ward ,  Reshad Rahman ,  David Toscano

发明人： Puneet Gupta ,  Sunil K. Srivastava ,  David Ward ,  Reshad Rahman ,  David Toscano

IPC分类号： G06F11/22

CPC分类号： H04L41/0659 ,  H04L41/0631

摘要： In one embodiment, an apparatus includes a physical port and a plurality of logical sub-interfaces under the physical port. The physical port and the logical sub-interfaces are configured as a Bidirectional Forwarding Detection (BFD) neighbor group. The physical port being configured to run BFD sessions to detect failures at a first rate that is substantially faster as compared to a second rate of BFD sessions to detect failures on the logical sub-interfaces. The physical port notifies the logical sub-interfaces of a BFD failure at the physical port, with the logical sub-interfaces shutting down responsive to the notification.

摘要翻译： 在一个实施例中，装置包括物理端口和物理端口下的多个逻辑子接口。 物理端口和逻辑子接口配置为双向转发检测（BFD）邻居组。 物理端口被配置为运行BFD会话，以与第二速率的BFD会话相比快速地检测故障，以检测逻辑子接口上的故障。 物理端口在物理端口通知逻辑子接口发生BFD故障，逻辑子接口响应通知关闭。

公开(公告)号：US6002670A

公开(公告)日：1999-12-14

申请号：US989682

申请日：1997-12-12

申请人： Reshad Rahman ,  Douglas H. Patriarche ,  Richard Vallee ,  Stuart C. White

发明人： Reshad Rahman ,  Douglas H. Patriarche ,  Richard Vallee ,  Stuart C. White

IPC分类号： H04L12/56 ,  H04Q11/04 ,  G08C15/00 ,  H04J3/14

CPC分类号： H04Q11/0478 ,  H04L2012/562 ,  H04L2012/5672

摘要： In ATM networks, digital data in ATM cells are sent to a destination node over a connection made up of more than one transmission link in round robin fashion. This is called inverse multiplexing. Suitable transmission links are selected among a plurality of provisionable transmission links according to some selection criteria. According to some embodiments of the invention, the selection criteria are minimum delay and maximum bandwidth.

摘要翻译： 在ATM网络中，ATM信元中的数字数据通过由多个传输链路以循环方式组成的连接被发送到目的地节点。 这被称为反向多路复用。 根据一些选择标准，在多个可配置传输链路中选择合适的传输链路。 根据本发明的一些实施例，选择标准是最小延迟和最大带宽。