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11. 发明授权

US08467394B2 Automatic route tagging of BGP next-hop routes in IGP 有权
标题翻译：在IGP中自动路由标记BGP下一跳路由
公开(公告)号：US08467394B2
公开(公告)日：2013-06-18
申请号：US13149535
申请日：2011-05-31
申请人： Clarence Filsfils , Stefano B. Previdi , Jean-Philippe Vasseur
发明人： Clarence Filsfils , Stefano B. Previdi , Jean-Philippe Vasseur
IPC分类号： H04L12/28 , H04L12/56
CPC分类号： H04L45/04 , H04L45/02 , H04L45/026 , H04L45/28 , H04L45/52
摘要： In one embodiment, a router in a routing domain exchanges routing information with one or more other routers located external to the routing domain using an exterior gateway protocol (EGP). The router exchanges routing information with one or more other routers located internal to the routing domain using an interior gateway protocol (IGP). The router detects a route to be advertised by the IGP is also used as a next-hop attribute of a route advertised by the EGP. In response, the router tags the route advertised by the IGP as an important route for convergence to indicate that the tagged route is to be processed before other routes that have not been tagged during convergence processing. The tagged route is advertised within the routing domain using the IGP.
摘要翻译：在一个实施例中，路由域中的路由器使用外部网关协议（EGP）与位于路由域外部的一个或多个其他路由器交换路由信息。路由器使用内部网关协议（IGP）与位于路由域内部的一个或多个其他路由器交换路由信息。路由器检测到IGP发布的路由也被用作EGP发布的路由的下一跳属性。作为响应，路由器将IGP发布的路由标记为收敛的重要路由，以指示在收敛处理期间未标记的其他路由之前要标记的路由将被处理。使用IGP在路由域内通告标记的路由。

12. 发明授权

US07978708B2 Automatic route tagging of BGP next-hop routes in IGP 有权
标题翻译：在IGP中自动路由标记BGP下一跳路由
公开(公告)号：US07978708B2
公开(公告)日：2011-07-12
申请号：US11025203
申请日：2004-12-29
申请人： Clarence Filsfils , Stefano B. Previdi , Jean-Philippe Vasseur
发明人： Clarence Filsfils , Stefano B. Previdi , Jean-Philippe Vasseur
IPC分类号： H04L12/28 , H04L12/56
CPC分类号： H04L45/04 , H04L45/02 , H04L45/026 , H04L45/28 , H04L45/52
摘要： A technique configures an intermediate network node to automatically determine whether a route advertised by a routing protocol is important for fast convergence in a computer network. As used herein, an important route needed for fast convergence is a route advertised by the routing protocol, such as an exterior gateway routing protocol (EGP) process executing on the node, as a next-hop address, since external connectivity relies on such a route. Notably, the EGP process interacts with an interior gateway routing protocol (IGP) process executing on the node to identify the route as an important route. Identification of an important route, in turn, allows IGP to process the route in a high priority fashion, thereby facilitating fast convergence.
摘要翻译：一种技术配置中间网络节点，以自动确定路由协议发布的路由是否对计算机网络中的快速收敛很重要。如本文所使用的，快速收敛所需的重要路由是路由协议所通告的路由，例如在节点上执行的外部网关路由协议（EGP）过程作为下一跳地址，因为外部连接依赖于路线。值得注意的是，EGP进程与在节点上执行的内部网关路由协议（IGP）进程交互，以将路由标识为重要路由。识别重要的路由又反过来允许IGP以高优先级的方式处理路由，从而促进快速收敛。

13. 发明授权

US07848240B2 Method and apparatus for forwarding data in a data communications network 有权
标题翻译：用于在数据通信网络中转发数据的方法和装置
公开(公告)号：US07848240B2
公开(公告)日：2010-12-07
申请号：US10858920
申请日：2004-06-01
申请人： Stefano Benedetto Previdi , Clarence Filsfils , Jean-Philippe Vasseur
发明人： Stefano Benedetto Previdi , Clarence Filsfils , Jean-Philippe Vasseur
IPC分类号： G01R31/08
CPC分类号： H04L45/24 , H04L45/02 , H04L45/123 , H04L45/125 , H04L45/48 , H04L47/10 , H04L47/125
摘要： A method is disclosed of forwarding data in a data communications network comprising a plurality of nodes and links therebetween, each link having an associated usage cost and a load capacity. A forwarding node identifies a lowest cost route, comprising one or more links, to a destination node. If a plurality of lowest cost routes is identified, then the forwarding node allocates data for forwarding along each of the lowest cost routes dependent on a relative load capacity of that route.
摘要翻译：公开了一种在数据通信网络中转发数据的方法，其中包括多个节点和链路之间的链路，每个链路具有相关联的使用成本和负载能力。转发节点向目的地节点标识包括一个或多个链路的最低成本路由。如果识别出多个最低成本路由，则转发节点根据该路由的相对负载能力分配用于沿每个最低成本路由转发的数据。

14. 发明授权

US07801137B2 Receiver-based construction of point-to-multipoint trees using path computation elements in a computer network 有权
标题翻译：在计算机网络中使用路径计算元素的基于接收器的点对多点树的构造
公开(公告)号：US07801137B2
公开(公告)日：2010-09-21
申请号：US12045749
申请日：2008-03-11
申请人： Jean-Philippe Vasseur , Stefano B. Previdi , Clarence Filsfils
发明人： Jean-Philippe Vasseur , Stefano B. Previdi , Clarence Filsfils
IPC分类号： H04L12/28
CPC分类号： H04L45/16 , H04L12/185 , H04L45/00 , H04L45/04 , H04L45/48 , H04L45/50
摘要： In one embodiment, a trigger to add a leaf node to a multicast group of a computer network is detected, and the leaf node may determine a root node of the multicast group to request a path between a tunnel tree and the leaf node of the multicast group. In response to the multicast group having an existing tree, a reply is received from the root node with a computed path to add the leaf node to the tree at a selected node of the tree. The leaf node may then be added to the multicast group tunnel tree over the computed path at the selected node.
摘要翻译：在一个实施例中，检测到向计算机网络的多播组添加叶节点的触发器，并且叶节点可以确定多播组的根节点以请求隧道树和多播的叶节点之间的路径组。响应于具有现有树的多播组，使用计算的路径从根节点接收回复，以将叶节点添加到树的所选节点处的树。然后可以通过所选节点处的计算路径将叶节点添加到多播组隧道树中。

15. 发明申请

US20060126495A1 System and methods for detecting network failure 有权
公开(公告)号：US20060126495A1
公开(公告)日：2006-06-15
申请号：US11001149
申请日：2004-12-01
申请人： James Guichard , Jean-Philippe Vasseur , Thomas Nadeau , Clarence Filsfils , David Ward , Stefano Previdi
发明人： James Guichard , Jean-Philippe Vasseur , Thomas Nadeau , Clarence Filsfils , David Ward , Stefano Previdi
IPC分类号： H04J1/16
CPC分类号： H04L45/22 , H04L41/0677 , H04L43/50 , H04L45/02 , H04L45/28
摘要： A path verification protocol (PVP) which enumerates a series of messages sent to a set of nodes, or routers, along a suspected path identifies forwarding plane problems for effecting changes at the control plane level. The messages include a command requesting interrogation of a further remote node for obtaining information about the path between the node receiving the PVP message and the further remote node. The node receiving the PVP message replies with a command response indicative of the outcome of attempts to reach the further remote node. The series of messages collectively covers a set of important routing points along a path from the originator to the recipient. The aggregate command responses to the series of PVP messages is analyzed to identify not only whether the entire path is operational, but also the location and nature of the problem.

16. 发明授权

US09065750B2 Congestion-based notification during fast reroute operations in stateful path computation element environments 有权
标题翻译：在状态路径计算元素环境中进行快速重路由操作期间基于拥塞的通知
公开(公告)号：US09065750B2
公开(公告)日：2015-06-23
申请号：US13524135
申请日：2012-06-15
申请人： Jean-Philippe Vasseur , Stefano Previdi , Clarence Filsfils
发明人： Jean-Philippe Vasseur , Stefano Previdi , Clarence Filsfils
IPC分类号： H04J3/14 , G06F11/00 , H04L12/729 , H04L12/707 , H04L12/703 , H04L12/801 , H04L12/911
CPC分类号： H04L45/125 , H04L45/22 , H04L45/28 , H04L47/11 , H04L47/825
摘要： In one embodiment, once activation of use of a backup tunnel is detected for a primary tunnel, then a level of congestion of the path of the backup tunnel may be determined. In response to the level being greater than a threshold, a head-end node of the primary tunnel is triggered to reroute the primary tunnel (e.g., requesting to a path computation element). Conversely, in response to the level not being greater than the threshold, the backup tunnel is allowed to remain activated.
摘要翻译：在一个实施例中，一旦检测到主隧道的备用隧道的使用的激活，则可以确定备用隧道的路径的拥塞级别。响应于该级别大于阈值，主隧道的前端节点被触发以重新路由主隧道（例如，请求到路径计算元件）。相反，响应级别不大于阈值，允许备份隧道保持激活。

17. 发明申请

US20130336107A1 DYNAMICALLY TRIGGERED TRAFFIC ENGINEERING ROUTING ADVERTISEMENTS IN STATEFUL PATH COMPUTATION ELEMENT ENVIRONMENTS 有权
标题翻译：动态路由计算元素环境下的动态交通工程路由广告
公开(公告)号：US20130336107A1
公开(公告)日：2013-12-19
申请号：US13524769
申请日：2012-06-15
申请人： Jean-Philippe Vasseur , Stefano Previdi , Clarence Filsfils
发明人： Jean-Philippe Vasseur , Stefano Previdi , Clarence Filsfils
IPC分类号： H04L12/24
CPC分类号： H04L45/028 , H04L41/0654 , H04L45/42 , H04L45/44 , H04L47/785 , H04L47/825
摘要： In one embodiment, a device (e.g., a path computation element, PCE) monitors a tunnel set-up failure rate within a computer network, and determines whether to adjust an accuracy of routing information based on the tunnel set-up failure rate. For instance, the tunnel set-up failure rate being above a first threshold indicates a need for greater accuracy. In response to the tunnel set-up failure rate being above the first threshold, the device may then instruct one or more routers to shorten their routing update interval in the computer network.
摘要翻译：在一个实施例中，设备（例如，路径计算元件，PCE）监视计算机网络内的隧道建立失败率，并且基于隧道建立失败率来确定是否调整路由信息的准确性。例如，隧道建立故障率高于第一阈值表示需要更高的精度。响应于隧道建立失败率高于第一阈值，设备然后可以指示一个或多个路由器缩短其在计算机网络中的路由更新间隔。

18. 发明授权

US08264962B2 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：US08264962B2
公开(公告)日：2012-09-11
申请号：US11168694
申请日：2005-06-27
申请人： Jean-Philippe Vasseur , David D. Ward , Stefano B. Previdi , Clarence Filsfils
发明人： Jean-Philippe Vasseur , David D. Ward , Stefano B. Previdi , Clarence Filsfils
IPC分类号： G01R31/08
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调整大小技术是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。

19. 发明授权

US08089968B2 Automatic prioritization of BGP next-hop in IGP convergence 有权
标题翻译：在IGP收敛中自动优先化BGP下一跳
公开(公告)号：US08089968B2
公开(公告)日：2012-01-03
申请号：US12204568
申请日：2008-09-04
申请人： Clarence Filsfils , Stefano B. Previdi , Jean-Philippe Vasseur
发明人： Clarence Filsfils , Stefano B. Previdi , Jean-Philippe Vasseur
IPC分类号： H04L1/00 , H04L12/26
CPC分类号： H04L45/02 , H04L45/04 , H04L45/14
摘要： In one embodiment, an inter-domain routing protocol stores an inter-domain routing protocol route having an associated next-hop address. A routing table is searched for an for an intra-domain routing protocol route that may be used to reach the next-hop address of the inter-domain routing protocol route. Such route is marked as an important route for convergence. Later, in response to a change in the network requiring a routing table update, the intra-domain routing protocol route marked as an important route for convergence is processed by an intra domain routing protocol before any other intra-domain routing protocol routes are processed that are not marked as important routes for convergence.
摘要翻译：在一个实施例中，域间路由协议存储具有相关联的下一跳地址的域间路由协议路由。搜索路由表寻找可用于到达域间路由协议路由的下一跳地址的域内路由协议路由。这种路线被标记为收敛的重要路线。之后，为了响应需要路由表更新的网络的变化，在处理任何其他域内路由协议路由之前，通过域内路由协议来处理标记为收敛的重要路由的域内路由协议路由，没有被标记为收敛的重要路线。

20. 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。

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