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1. 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.

2. 发明申请

US20060262772A1 System and methods for providing a network path verification protocol 审中-公开
标题翻译：提供网络路径验证协议的系统和方法
公开(公告)号：US20060262772A1
公开(公告)日：2006-11-23
申请号：US11135253
申请日：2005-05-23
申请人： James Guichard , Jean-Philippe Vasseur , Thomas Nadeau , David Ward , Stefano Previdi
发明人： James Guichard , Jean-Philippe Vasseur , Thomas Nadeau , David Ward , Stefano Previdi
IPC分类号： H04L12/28
CPC分类号： H04L45/308 , H04L43/0811 , H04L43/12 , H04L45/04 , H04L45/302 , H04L45/70 , H04L47/24 , H04L63/029
摘要： A path verification protocol (PVP) which enumerates a series of messages sent to a set of nodes, or routers, along a network path identifies connectivity and transmission characteristic attributes by defining, implementing, and analyzing path verification messages (PVMs) in a VPN environment. Typical VPN environments are characterized by service level agreements (SLAs) between service providers which specify particular service level and/or bandwidth level guarantees, typically in terms of megabits per second (MB/s) or other qualitative transfer criteria. Such guarantees are often expressed in contractual terms as Quality of Service (QoS) criteria. Configurations herein provide a mechanism for determination of paths and/or routes that satisfy a QoS or other delivery speed/bandwidth guarantee. Such a mechanism may therefore be employed to perform routing decisions for QoS based traffic. Further, such a mechanism is employable to verify QoS levels and related attributes related to contractual terms between service providers and customers.
摘要翻译：路径验证协议（PVP），其列举沿着网络路径发送到一组节点或路由器的一系列消息，通过在VPN环境中定义，实现和分析路径验证消息（PVM）来识别连接性和传输特性属性。典型的VPN环境的特征在于服务提供商之间的服务级别协议（SLA），其指定特定服务级别和/或带宽级别保证，通常以兆比特每秒（MB / s）或其他定性传输标准。这种保证通常以合同条款表示为服务质量（QoS）标准。本文中的配置提供了用于确定满足QoS或其他传送速度/带宽保证的路径和/或路由的机制。因此可以采用这种机制来执行基于QoS的业务的路由决策。此外，这种机制可用于验证与服务提供商和客户之间的合同条款相关的QoS等级和相关属性。

3. 发明申请

US20060187916A1 Methods and apparatus based on message transmission times 有权
标题翻译：基于消息传输时间的方法和设备
公开(公告)号：US20060187916A1
公开(公告)日：2006-08-24
申请号：US11063803
申请日：2005-02-23
申请人： Jean-Philippe Vasseur , Stefano Previdi , James Guichard , David Ward
发明人： Jean-Philippe Vasseur , Stefano Previdi , James Guichard , David Ward
IPC分类号： H04L12/56
CPC分类号： H04L12/56
摘要： A data communication device (e.g., a router) originates a network configuration message in response to a network topology change or so as to refresh a configuration message. The data communication device encodes a timestamp in the network configuration message. The timestamp indicates a time of originating the network configuration message. Further, the data communication device transmits the network configuration message over the network to other network devices that, in turn, initiate further broadcast of at least a portion of contents of the network configuration message. Based on the timestamp of the network configuration message, the data communication devices receiving the network configuration message identify transmission time value indicating how long the network configuration message takes to be conveyed over the network to the other network devices. The data communication devices utilize the transmission time value as a timeout period for determining whether a data communication device failure occurs.
摘要翻译：数据通信设备（例如，路由器）响应于网络拓扑变化而发起网络配置消息，以便刷新配置消息。数据通信设备对网络配置消息中的时间戳进行编码。时间戳表示发起网络配置消息的时间。此外，数据通信设备通过网络将网络配置消息发送到其他网络设备，其进一步发起网络配置消息的至少一部分内容的进一步广播。基于网络配置消息的时间戳，接收网络配置消息的数据通信设备识别表示网络配置消息在网络上传送到其他网络设备多长时间的传输时间值。数据通信设备利用传输时间值作为用于确定数据通信设备故障是否发生的超时周期。

4. 发明申请

US20060171331A1 System and methods for network path detection 有权
标题翻译：网络路径检测的系统和方法
公开(公告)号：US20060171331A1
公开(公告)日：2006-08-03
申请号：US11048077
申请日：2005-02-01
申请人： Stefano Previdi , James Guichard , Jean-Philippe Vasseur , David Ward
发明人： Stefano Previdi , James Guichard , Jean-Philippe Vasseur , David Ward
IPC分类号： H04L12/56 , H04L12/28
CPC分类号： H04L45/026 , H04L43/0811 , H04L45/26 , H04L45/28 , H04L63/0272
摘要： Customer edge (CE) to CE device verification checks initiate routes from available CEs as a set of path verification messages, destined for remote CE routes serving a remote VPN. An extended community attribute, included among the attributes of the path verification message, stores the identity of the originating CE router. The path verification message propagates across the network, and transports the identity of the originating CE router because the originator identity is not overwritten by successive routing. Upon receipt by the remote CE, the originator is determinable from the extended community attribute. A further reachability field is also included in the extended community attribute and indicates whether per CE or per prefix is appropriate for the particular route in question. In this manner, CE-CE connectivity checks identify CEs which are reachable from other CEs. Accordingly, such a mechanism allows for route reachability aggregation on a per-CE or per-prefix reachability basis.
摘要翻译：客户端（CE）到CE设备验证检查从可用的CE启动路由作为一组路径验证消息，目的地是服务于远程VPN的远程CE路由。包含在路径验证消息的属性之间的扩展团体属性存储始发CE路由器的身份。路径验证消息通过网络传播，并传输始发CE路由器的身份，因为始发方身份不会被连续路由覆盖。远程CE收到后，发起者可以从扩展团体属性中确定。扩展社区属性中还包括另外的可访问性字段，并指示每个CE或每个前缀是否适合所讨论的特定路由。以这种方式，CE-CE连接检查可以识别可从其他CE接入的CE。因此，这种机制允许基于每个CE或每个前缀可达性的路由可达性聚合。

5. 发明申请

US20060215577A1 System and methods for identifying network path performance 审中-公开
标题翻译：用于识别网络路径性能的系统和方法
公开(公告)号：US20060215577A1
公开(公告)日：2006-09-28
申请号：US11086007
申请日：2005-03-22
申请人： James Guichard , Jean-Philippe Vasseur , Thomas Nadeau , David Ward
发明人： James Guichard , Jean-Philippe Vasseur , Thomas Nadeau , David Ward
IPC分类号： H04L12/28
CPC分类号： H04L43/50 , H04L41/12 , H04L41/5003 , H04L45/00 , H04L45/121 , H04L45/123 , H04L45/124 , H04L45/22 , H04L45/26 , H04L45/302 , H04L45/42 , H04L45/50
摘要： A system and method for aggregating performance characteristics for core network paths allows computation of message traffic performance over each of the available candidate paths through the core for identifying an optimal core network path. Particular network traffic, or messages, include attributes indicative of performance, such as transport time, delay, jitter, and drop percentage, over individual hops along the candidate path. A diagnostic processor parses these messages to identify the attributes corresponding to performance, and analyzes the resulting parsed routing information to compute an expected performance, such as available bandwidth (e.g. transport rate) over the path. Messages including such attributes may include link state attribute (LSA) messages, diagnostic probe messages specifically targeted to enumerate such attributes, or other network suitable network traffic. In a particular configuration, the messages may be Path Verification Protocol (PVP) messages.
摘要翻译：用于聚合核心网络路径的性能特征的系统和方法允许通过核心的每个可用候选路径计算消息业务性能，用于识别最佳核心网路径。特定网络流量或消息包括指示性能的属性，例如沿着候选路径的单个跳跃的传输时间，延迟，抖动和丢弃百分比。诊断处理器解析这些消息以识别与性能相对应的属性，并分析所得到的解析路由信息以计算期望的性能，例如路径上的可用带宽（例如传输速率）。包括这些属性的消息可以包括链路状态属性（LSA）消息，专门用于枚举这样的属性的诊断探测消息，或其他网络合适的网络业务。在特定配置中，消息可以是路径验证协议（PVP）消息。

6. 发明授权

US08855014B2 Distributed stateful path computation element overlay architecture 有权
标题翻译：分布状态路径计算元素覆盖架构
公开(公告)号：US08855014B2
公开(公告)日：2014-10-07
申请号：US13524071
申请日：2012-06-15
申请人： Stefano Previdi , Jean-Philippe Vasseur , Jan Medved , David Ward
发明人： Stefano Previdi , Jean-Philippe Vasseur , Jan Medved , David Ward
IPC分类号： H04L12/28 , H04L1/00
CPC分类号： H04L45/50 , H04L45/04
摘要： In one embodiment, a particular device in a computer network maintains a locally owned tunnel-state table, and joins a distributed hash table (DHT) ring. In addition, the locally owned tunnel-state table is shared with other devices of the DHT ring to establish a DHT-owned tunnel-state table. The particular device (and other devices) determines ownership of link-state advertisements (LSAs) for a specific portion of a traffic engineering database (TED) according to the DHT ring. As such, when the particular device (or any device) computes a path for a tunnel using a local TED, the particular device may request permission to use resources along the computed path that were advertised in particular LSAs from owners of those particular LSAs when not owned by the particular device.
摘要翻译：在一个实施例中，计算机网络中的特定设备维护本地拥有的隧道状态表，并且连接分布式散列表（DHT）环。此外，本地拥有的隧道状态表与DHT环的其他设备共享，以建立DHT拥有的隧道状态表。特定设备（和其他设备）根据DHT环确定针对流量工程数据库（TED）的特定部分的链路状态通告（LSA）的所有权。因此，当特定设备（或任何设备）使用本地TED计算隧道的路径时，特定设备可以请求允许沿着所计算的路径使用资源，这些资源在特定LSA的特定LSA中被发布，来自那些特定LSA的所有者由特定设备拥有。

7. 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。

8. 发明申请

US20060193248A1 Loop prevention technique for MPLS using service labels 有权
标题翻译：使用服务标签的MPLS环路防护技术
公开(公告)号：US20060193248A1
公开(公告)日：2006-08-31
申请号：US11068081
申请日：2005-02-28
申请人： Clarence Filsfils , David Ward , Stefano Previdi , Jean-Philippe Vasseur , Jim Guichard , Robert Raszuk
发明人： Clarence Filsfils , David Ward , Stefano Previdi , Jean-Philippe Vasseur , Jim Guichard , Robert Raszuk
IPC分类号： H04J3/14 , H04L12/56 , H04J1/16 , H04L12/28
CPC分类号： H04L45/18 , H04L45/04 , H04L45/22 , H04L45/28 , H04L45/50
摘要： A local 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. The backup edge device identifies protected data packets as those which contain a predetermined “service” label in their MPLS label stacks. In other words, the service label is used as an identifier for packets that have been FRR rerouted. Upon receiving a data packet containing a service label, the backup edge device is not permitted to reroute the packet a second time, e.g., in response to another inter-domain node or link failure, thereby preventing loops from developing at the edge of the network.
摘要翻译：本地快速重路由（FRR）技术在计算机网络的边缘实现。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。备份边缘设备将受保护的数据包标识为在其MPLS标签堆栈中包含预定“服务”标签的数据包。换句话说，服务标签被用作已被FRR重新路由的数据包的标识符。在接收到包含服务标签的数据分组时，不允许备份边缘设备第二次重新路由该分组，例如响应于另一个域间节点或链路故障，从而防止在网络边缘发展的环路。

9. 发明申请

US20060126496A1 Fast reroute (FRR) protection at the edge of a RFC 2547 network 有权
公开(公告)号：US20060126496A1
公开(公告)日：2006-06-15
申请号：US11010225
申请日：2004-12-10
申请人： Clarence Filsfils , Stefano Previdi , John Scudder , David Ward , Jean-Philippe Vasseur , Jim Guichard
发明人： Clarence Filsfils , Stefano Previdi , John Scudder , David Ward , Jean-Philippe Vasseur , Jim Guichard
IPC分类号： H04L12/26
CPC分类号： H04L45/28 , H04L45/02 , H04L45/04 , H04L45/22 , H04L45/50
摘要： A fast reroute (FRR) technique that may be deployed at the edge of a network having first and second edge devices coupled to a neighboring routing domain. If the first edge device detects a node or link failure that prevents it from communicating with the neighboring domain, the first edge device reroutes at least some data packets addressed to the neighboring domain to the second edge device. The second edge device receives the rerouted packets and then forwards the packets to the neighboring domain. Notably, the second edge device is not permitted to reroute the received packets a second time, e.g., upon identifying another inter-domain node or link failure. As such, loops are avoided at the edge of the network and packets are rerouted to the neighboring routing domain faster and more efficiently than in prior implementations.

10. 发明申请

US20060140111A1 Method and apparatus to compute local repair paths taking into account link resources and attributes 有权
标题翻译：考虑链路资源和属性来计算局部修复路径的方法和装置
公开(公告)号：US20060140111A1
公开(公告)日：2006-06-29
申请号：US11025179
申请日：2004-12-29
申请人： Jean-Philippe Vasseur , Stefano Previdi , David Ward
发明人： Jean-Philippe Vasseur , Stefano Previdi , David Ward
IPC分类号： H04L12/26 , H04J1/16 , H04J3/14 , H04L12/56 , H04L12/28
CPC分类号： H04L45/28 , H04J3/14 , H04L45/02
摘要： A technique for calculating local repair paths through a computer network using one or more dynamically measured parameters in place of, or in addition to, statically assigned cost metrics. The dynamically measured parameters include various statistical measures of resources and attributes associated with data links and/or network nodes in the computer network. In operation, an intermediate node monitors a set of local link and/or node parameters. The node may generate an advertisement in response to at least one of its monitored parameters crossing a predetermined threshold value or changing value by a predetermined percentage or amount. The advertisement is “flooded” so as to advertise the dynamically measured parameter value to other neighboring intermediate nodes. After receiving the advertisement, each node may recalculate one or more local repair paths based on the advertised parameter value. The node may utilize a recalculated repair path if it provides an appreciably lower-cost path, e.g., by a predetermined percentage, as compared with the currently deployed repair path.
摘要翻译：一种用于通过使用一个或多个动态测量参数来代替静态分配的成本度量来计算通过计算机网络的局部修复路径的技术。动态测量的参数包括与计算机网络中的数据链路和/或网络节点相关联的资源和属性的各种统计测量。在操作中，中间节点监视一组本地链路和/或节点参数。该节点可以响应于其所监视的参数中的至少一个与预定阈值相交或者以预定百分比或数量改变值来生成广告。广告被“淹没”，以便将动态测量的参数值通告给其他相邻的中间节点。在接收到广告之后，每个节点可以基于所通告的参数值重新计算一个或多个本地修复路径。如果节点可以使用重新计算的修复路径，如果其与当前部署的修复路径相比提供了明显较低成本的路径，例如，以预定百分比。

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