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1. 发明授权

US09143431B2 Hiding a service node in a network from a network routing topology 有权
标题翻译：从网络路由拓扑中隐藏网络中的服务节点
公开(公告)号：US09143431B2
公开(公告)日：2015-09-22
申请号：US12981444
申请日：2010-12-29
申请人： Pradosh Mohapatra , Stefano B. Previdi , Clarence Filsfils , David Ward
发明人： Pradosh Mohapatra , Stefano B. Previdi , Clarence Filsfils , David Ward
IPC分类号： H04L12/28 , H04L12/751
CPC分类号： H04L45/025
摘要： Hiding a service node in a network from a network topology is provided. In one embodiment, for example, an apparatus for hiding a service node in a network from a network topology, the apparatus comprising: a network interface; a processor; and one or more stored sequences of instructions which, when executed by the processor, cause the processor to perform: discovering a service node in a data network in accordance with a link-state protocol wherein the service node provides a network topology dependent service other than packet forwarding; establishing a link-state adjacency with the service node and one or more packet forwarding nodes in accordance with the link-state protocol; receiving a link-state advertisement; in response to identifying the link-state advertisement as an originating link-state advertisement sent from the service node, suppressing flooding of the received link-state advertisement to the one or more packet forwarding nodes.
摘要翻译：提供了从网络拓扑中隐藏网络中的服务节点。在一个实施例中，例如，一种用于从网络拓扑中隐藏网络中的服务节点的装置，所述装置包括：网络接口; 处理器以及一个或多个存储的指令序列，当由所述处理器执行时，所述指令序列使所述处理器执行：根据链路状态协议在数据网络中发现服务节点，其中所述服务节点提供除分组转发; 根据链路状态协议与服务节点和一个或多个分组转发节点建立链路状态邻接; 接收链接状态广告; 响应于将所述链路状态广告识别为从所述服务节点发送的始发链路状态广告，抑制所接收的链路状态广告对所述一个或多个分组转发节点的洪泛。

2. 发明授权

US07428213B2 Method and apparatus for determining network routing information based on shared risk link group information 有权
标题翻译：基于共享风险链路组信息确定网络路由信息的方法和装置
公开(公告)号：US07428213B2
公开(公告)日：2008-09-23
申请号：US10719003
申请日：2003-11-21
申请人： Jean Philippe Vasseur , Stefano B. Previdi , Clarence Filsfils , David Ward
发明人： Jean Philippe Vasseur , Stefano B. Previdi , Clarence Filsfils , David Ward
IPC分类号： H04L12/26
CPC分类号： H04L45/12 , H04B1/71635 , H04L45/02 , H04L45/18 , H04L45/22 , H04L45/28 , H04L45/46 , H04L45/48 , H04L45/50 , H04W88/06 , H04W88/10
摘要： A method and apparatus are disclosed for performing a shortest path first network routing path determination in a data communications network based in part on information about links that are associated as shared risk link groups. Micro-loops are avoided in computing shortest path first trees by considering whether links are within shared risk link groups. In a first approach, for each link state packet in a link state database, listed adjacencies are removed if the link between the node originating the LSP and the reported adjacency belongs to a shared risk link group for which one component (local link) is known as down, and a shortest path first computation is then performed. In a second approach, during the SPT computation and after having added a first node to a path, each neighboring node is added to a tentative tree if and only if, a link between the first node and the neighboring node does not belong to a shared risk link group for which one component (local link) is known as down.
摘要翻译：公开了一种用于在数据通信网络中执行最短路径第一网络路由路径确定的方法和装置，部分地基于关于作为共享风险链路组关联的链路的信息。通过考虑链路是否在共享风险链路组内，避免了计算最短路径树的微循环。在第一种方法中，对于链路状态数据库中的每个链路状态分组，如果发起LSP的节点和报告的邻接关系之间的链路属于已知一个组件（本地链路）的共享风险链路组，则删除列出的邻接关系然后执行最短路径优先计算。在第二种方法中，在SPT计算期间，并且在将第一节点添加到路径之后，当且仅当第一节点和相邻节点之间的链路不属于共享时，每个相邻节点被添加到暂定树一个组件（本地链路）被称为down的风险链路组。

3. 发明授权

US07974285B2 Method and apparatus for identifying an egress point to a network location 有权
标题翻译：用于识别到网络位置的出口点的方法和装置
公开(公告)号：US07974285B2
公开(公告)日：2011-07-05
申请号：US11045015
申请日：2005-01-26
申请人： Stefano Benedetto Previdi , Clarence Filsfils , Jean-Philippe Vasseur , Benoit Claise , David Ward
发明人： Stefano Benedetto Previdi , Clarence Filsfils , Jean-Philippe Vasseur , Benoit Claise , David Ward
IPC分类号： H04L12/28 , H04L12/56 , G06F15/173
CPC分类号： H04L45/02
摘要： A method of identifying an egress point to a network location in a data communications network comprising a plurality of nodes and links there between comprises the step, performed at the identifying node, of receiving a notification through the network advertising an adjacency to a network location. The method further comprises the steps, performed at the identifying node, of deriving from the notification adjacency information and identifying, from the adjacency information, the egress point.
摘要翻译：一种识别包括在其中的多个节点和链路的数据通信网络中的网络位置的出口点的方法包括：在识别节点执行的步骤，通过网络接收通知与网络位置相邻的通知。所述方法还包括在所述识别节点处执行的从所述通知邻接信息导出并从所述邻接信息识别所述出口点的步骤。

4. 发明申请

US20090010153A1 Fast remote failure notification 有权
标题翻译：快速远程故障通知
公开(公告)号：US20090010153A1
公开(公告)日：2009-01-08
申请号：US11824885
申请日：2007-07-03
申请人： Clarence Filsfils , Stefano Previdi , David Ward
发明人： Clarence Filsfils , Stefano Previdi , David Ward
IPC分类号： H04L12/24
CPC分类号： H04L45/22 , H04L45/02 , H04L45/28 , H04L67/14 , H04L69/40
摘要： A method and system for failure notification at a remote node in communication with a local node are disclosed. The local node is configured for faster failure detection than the remote node. In one embodiment, the method includes establishing a failure monitoring session between the local node and the remote node, receiving at the remote node, a failure notification from the local node, the failure notification sent using a protocol of the failure monitoring session, and rerouting traffic at the remote node in response to the failure notification.
摘要翻译：公开了一种在与本地节点通信的远程节点处的故障通知的方法和系统。本地节点配置为比远程节点更快的故障检测。在一个实施例中，该方法包括在本地节点和远程节点之间建立故障监视会话，在远程节点接收来自本地节点的故障通知，使用故障监视会话的协议发送的故障通知和重新路由响应故障通知在远程节点的流量。

5. 发明申请

US20070091796A1 Method of implementing a backup path in an autonomous system 有权
标题翻译：在自治系统中实现备份路径的方法
公开(公告)号：US20070091796A1
公开(公告)日：2007-04-26
申请号：US11254609
申请日：2005-10-20
申请人： Clarence Filsfils , Stewart Bryant , Ian Shand , David Ward , John Scudder
发明人： Clarence Filsfils , Stewart Bryant , Ian Shand , David Ward , John Scudder
IPC分类号： H04J3/14
CPC分类号： H04L45/00 , H04L45/18 , H04L45/22 , H04L45/28
摘要： A method of implementing a backup path in an autonomous system (AS) for failure of an inter-AS link is described. The method comprises forwarding data elements destined for the failed link via a backup path and including a loop prevention attribute in the packet.
摘要翻译：描述了在自治系统（AS）中实现AS间链路故障的备用路径的方法。该方法包括经由备份路径转发去往故障链路的数据元素，并在分组中包括环路防止属性。

6. 发明申请

US20070091795A1 Method of constructing a backup path in an autonomous system 有权
标题翻译：在自治系统中构建备份路径的方法
公开(公告)号：US20070091795A1
公开(公告)日：2007-04-26
申请号：US11254587
申请日：2005-10-20
申请人： Olivier Bonaventure , Pierre Francois , Clarence Filsfils , Stewart Bryant , David Ward , John Scudder , Stefano Previdi , Ian Shand , Gargi Nalawade
发明人： Olivier Bonaventure , Pierre Francois , Clarence Filsfils , Stewart Bryant , David Ward , John Scudder , Stefano Previdi , Ian Shand , Gargi Nalawade
IPC分类号： H04J3/14 , H04L12/56
CPC分类号： H04L45/22 , H04L45/04 , H04L45/28 , H04L2212/00
摘要： A method of constructing a backup path in an autonomous system (AS) for failure of an inter-AS link is described. The method comprises identifying an alternate inter-AS path and constructing a tunnel to an end point on the alternate path.
摘要翻译：描述了在自治系统（AS）中构建用于AS间链路故障的备用路径的方法。该方法包括识别替代的AS间路径并构建到备用路径上的终点的隧道。

7. 发明申请

US20070091794A1 Method of constructing a backup path in an autonomous system 审中-公开
标题翻译：在自治系统中构建备份路径的方法
公开(公告)号：US20070091794A1
公开(公告)日：2007-04-26
申请号：US11254469
申请日：2005-10-20
申请人： Clarence Filsfils , Stewart Bryant , David Ward , John Scudder , Stefano Previdi , Ian Charles Shand , Gargi Nalawade
发明人： Clarence Filsfils , Stewart Bryant , David Ward , John Scudder , Stefano Previdi , Ian Charles Shand , Gargi Nalawade
IPC分类号： H04J3/14 , H04L12/56
CPC分类号： H04L45/22 , H04L12/66 , H04L45/04 , H04L45/28 , H04L45/50
摘要： A method of constructing a backup path in an autonomous system (AS) for failure of a first inter-AS link serving a first set of prefixes is described. The method comprises identifying an alternate inter-AS link serving said plurality of prefixes and constructing a tunnel thereto.
摘要翻译：描述了在自治系统（AS）中构建用于服务于第一组前缀的第一AS间链路故障的备用路径的方法。该方法包括：识别服务于所述多个前缀的替代的AS间链路，并构建一个隧道。

8. 发明申请

US20060221813A1 Loop prevention techniques using encapsulation manipulation of IP/MPLS field 有权
标题翻译：使用IP / MPLS领域的封装处理的环路预防技术
公开(公告)号：US20060221813A1
公开(公告)日：2006-10-05
申请号：US11098173
申请日：2005-04-04
申请人： John Scudder , David Ward , Clarence Filsfils
发明人： John Scudder , David Ward , Clarence Filsfils
IPC分类号： H04L12/56 , H04J1/16 , H04J3/14 , G08C15/00 , H04L12/28
CPC分类号： H04L45/22 , H04L45/02 , H04L45/28 , H04L45/50 , H04L47/2408
摘要： A fast reroute (FRR) technique is implemented at the edge of a computer network. In accordance with the technique, if an edge device detects a node or link failure that prevents it from communicating with a neighboring routing domain, the edge device reroutes at least some data packets addressed to that domain to a backup edge device which, in turn, forwards the packets to the neighboring domain. The rerouted packets are designated as being “protected” (i.e., rerouted) data packets before they are forwarded to the backup edge device. To that end, the edge device incorporates an identifier into the rerouted data packets to indicate that the packets are being FRR rerouted. The identifier may be a predetermined value stored at a known location in the rerouted packets'encapsulation headers, such as in their MPLS or IP headers. Upon receiving a data packet containing the identifier, the backup edge device is not permitted to reroute the packet a second time.
摘要翻译：在计算机网络的边缘实现快速重路由（FRR）技术。根据该技术，如果边缘设备检测到阻止其与相邻路由域通信的节点或链路故障，则边缘设备将至少一些寻址到该域的数据分组重新路由到备用边缘设备，将数据包转发到相邻域。重新路由的数据包在被转发到备份边缘设备之前被指定为“保护”（即重新路由）数据分组。为此，边缘设备将重新路由的数据分组中的标识符合并，以指示分组正在被FRR重新路由。标识符可以是存储在重新路由的分组的封装报头中的已知位置的预定值，例如在其MPLS或IP报头中。在接收到包含标识符的数据分组时，不允许备份边缘设备再次重新路由该分组。

9. 发明授权

US08488444B2 Fast remote failure notification 有权
公开(公告)号：US08488444B2
公开(公告)日：2013-07-16
申请号：US11824885
申请日：2007-07-03
申请人： Clarence Filsfils , Stefano Previdi , David Ward
发明人： Clarence Filsfils , Stefano Previdi , David Ward
IPC分类号： G01R31/08
CPC分类号： H04L45/22 , H04L45/02 , H04L45/28 , H04L67/14 , H04L69/40
摘要： A method and system for failure notification at a remote node in communication with a local node are disclosed. The local node is configured for faster failure detection than the remote node. In one embodiment, the method includes establishing a failure monitoring session between the local node and the remote node, receiving at the remote node, a failure notification from the local node, the failure notification sent using a protocol of the failure monitoring session, and rerouting traffic at the remote node in response to the failure notification.

10. 发明申请

US20060291391A1 System and method for dynamically responding to event-based traffic redirection 有权
标题翻译：用于动态响应基于事件的流量重定向的系统和方法
公开(公告)号：US20060291391A1
公开(公告)日：2006-12-28
申请号：US11168694
申请日：2005-06-27
申请人： Jean-Philippe Vasseur , David Ward , Stefano Previdi , Clarence Filsfils
发明人： Jean-Philippe Vasseur , David Ward , Stefano Previdi , Clarence Filsfils
IPC分类号： H04J1/16 , H04L12/28 , H04L12/56
CPC分类号： H04L45/22 , H04L45/02 , H04L45/28 , H04L47/70 , H04L47/746 , H04L47/762 , H04L47/825 , H04L47/829
摘要： A technique dynamically resizes Traffic Engineering (TE) Label Switched Paths (LSPs) at a head-end node of the TE-LSPs in preparation to receive redirected traffic in response to an event in a computer network. The novel dynamic TE-LSP resizing technique is based on the detection of an event in the network that could cause traffic destined for one or more other (“remote”) head-end nodes of one or more TE-LSPs to be redirected to an event-detecting (“local”) head-end node of one or more TE-LSPs. An example of such a traffic redirection event is failure of a remote head-end node or failure of any of its TE-LSPs. Specifically, the local head-end node maintains TE-LSP steady state sampling and resizing frequencies to adapt the bandwidth of its TE-LSP(s) to gradual changes in the network over time. Upon detection of an event identifying possible traffic redirection, the local head-end node enters a Fast Resize (FR) state, in which the sampling and resizing frequencies are increased to quickly adapt the TE-LSP bandwidth(s) to any received redirected traffic.
摘要翻译：技术动态地调整TE-LSP的头端节点处的流量工程（TE）标签交换路径（LSP），准备响应于计算机网络中的事件接收重定向的流量。新型动态TE-LSP调整大小技术基于网络中可能导致一个或多个TE-LSP的一个或多个其他（“远程”）头端节点的流量被重定向到的事件的检测一个或多个TE-LSP的事件检测（“本地”）头端节点。这种流量重定向事件的示例是远程头端节点的故障或其任何TE-LSP的故障。具体来说，本地前端节点维护TE-LSP稳态采样和调整频率，以适应其TE-LSP的带宽随时间逐渐变化的网络。在检测到识别可能的业务重定向的事件时，本地前端节点进入快速调整大小（FR）状态，其中增加采样和调整大小频率以快速地将TE-LSP带宽适配到任何接收到的重定向业务。

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