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21. 发明授权

US09077615B2 Global state resynchronization for path computation element failure during a reoptimization process 有权
标题翻译：重新优化过程中路径计算元素故障的全局状态重新同步
公开(公告)号：US09077615B2
公开(公告)日：2015-07-07
申请号：US13524632
申请日：2012-06-15
申请人： Jean-Philippe Vasseur , Stefano Previdi , David Ward , George Swallow
发明人： Jean-Philippe Vasseur , Stefano Previdi , David Ward , George Swallow
IPC分类号： H04L1/02 , H04J3/14 , H04L12/24 , H04L12/46 , H04L12/751 , H04L12/707 , H04L12/703 , H04L12/717 , H04L12/723 , H04L12/26
CPC分类号： H04L41/0663 , H04L12/4633 , H04L43/10 , H04L45/02 , H04L45/22 , H04L45/28 , H04L45/42 , H04L45/50
摘要： In one embodiment, a router initiates reroutes of one or more tunnels at the router as part of optimization of a plurality of tunnels in a computer network, and stores an original state of the one or more tunnels at the router prior to the optimization. By detecting whether path computation element (PCE) failure occurs prior to completion of the optimization, the router may revert to the original state of the one or more tunnels in response to PCE failure prior to completion of the optimization.
摘要翻译：在一个实施例中，路由器发起路由器处的一个或多个隧道的路由器作为计算机网络中的多个隧道的优化的一部分，并且在优化之前在路由器处存储一个或多个隧道的原始状态。通过检测在优化完成之前是否发生路径计算元件（PCE）故障，路由器可以在完成优化之前响应于PCE故障而恢复到一个或多个隧道的原始状态。

22. 发明申请

US20130336159A1 DISTRIBUTED STATEFUL PATH COMPUTATION ELEMENT OVERLAY ARCHITECTURE 有权
标题翻译：分布式状态计算元素重叠结构
公开(公告)号：US20130336159A1
公开(公告)日：2013-12-19
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
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中被从该特定LSA的所有者通告由特定设备拥有。

23. 发明申请

US20130336109A1 ORDERED FLOODING REQUESTS FOR PATH COMPUTATION ELEMENTS 有权
标题翻译：路径计算要素的订购流水要求
公开(公告)号：US20130336109A1
公开(公告)日：2013-12-19
申请号：US13524057
申请日：2012-06-15
申请人： Stefano Previdi , Jean-Philippe Vasseur , David Ward
发明人： Stefano Previdi , Jean-Philippe Vasseur , David Ward
IPC分类号： H04L12/24 , H04L12/26
CPC分类号： H04L43/16 , H04L41/12 , H04L45/025 , H04L45/28 , H04L45/42 , H04L45/50
摘要： In one embodiment, a stateful path computation element (PCE) in a computer network determines a need to route at least a threshold number of tunnels, and in response, triggers a routing update from a determined set of routers. Having updated the routing information and available network resources for the set of routers, the stateful PCE may then compute the tunnels based on the update.
摘要翻译：在一个实施例中，计算机网络中的有状态路径计算元件（PCE）确定需要路由至少一个阈值数量的隧道，并且作为响应，从确定的一组路由器触发路由更新。为了更新路由器集合的路由信息和可用的网络资源，状态PCE然后可以基于更新来计算隧道。

24. 发明申请

US20130336108A1 GLOBAL STATE RESYNCHRONIZATION FOR PATH COMPUTATION ELEMENT FAILURE DURING A REOPTIMIZATION PROCESS 有权
标题翻译：解决过程中路面计算单元故障的全局状态重建
公开(公告)号：US20130336108A1
公开(公告)日：2013-12-19
申请号：US13524632
申请日：2012-06-15
申请人： Jean-Philippe Vasseur , Stefano Previdi , David Ward , George Swallow
发明人： Jean-Philippe Vasseur , Stefano Previdi , David Ward , George Swallow
IPC分类号： H04L12/26
CPC分类号： H04L41/0663 , H04L12/4633 , H04L43/10 , H04L45/02 , H04L45/22 , H04L45/28 , H04L45/42 , H04L45/50
摘要： In one embodiment, a router initiates reroutes of one or more tunnels at the router as part of optimization of a plurality of tunnels in a computer network, and stores an original state of the one or more tunnels at the router prior to the optimization. By detecting whether path computation element (PCE) failure occurs prior to completion of the optimization, the router may revert to the original state of the one or more tunnels in response to PCE failure prior to completion of the optimization.
摘要翻译：在一个实施例中，路由器发起路由器处的一个或多个隧道的路由器作为计算机网络中的多个隧道的优化的一部分，并且在优化之前在路由器处存储一个或多个隧道的原始状态。通过检测在优化完成之前是否发生路径计算元件（PCE）故障，路由器可以在完成优化之前响应于PCE故障而恢复到一个或多个隧道的原始状态。

25. 发明申请

US20130013809A1 MANAGING HOST ROUTES FOR LOCAL COMPUTER NETWORKS WITH A PLURALITY OF FIELD AREA ROUTERS 有权
标题翻译：管理具有多个现场区域路由器的本地计算机网络的主机路由
公开(公告)号：US20130013809A1
公开(公告)日：2013-01-10
申请号：US13176301
申请日：2011-07-05
申请人： Jean-Philippe Vasseur , Jonathan W. Hui , Stefano Previdi , Shmuel Shaffer
发明人： Jean-Philippe Vasseur , Jonathan W. Hui , Stefano Previdi , Shmuel Shaffer
IPC分类号： G06F15/173
CPC分类号： H04L45/22 , H04L45/64
摘要： In one embodiment, a particular field area router (FAR), in a local computer network (e.g., a mesh network) having a plurality of FARs, advertises a common subnet prefix assigned to the local computer network into a global computer network. Each of the plurality of FARs of the local computer network is configured to accept any traffic destined to the local computer network, and a tunnel overlay is built among the plurality of FARs. Upon receiving a packet at the particular FAR destined to a particular device in the local computer network, and in response to the particular FAR not having a host route to the particular device, it forwards the packet on the tunnel overlay to another of the plurality of FARs of the local computer network.
摘要翻译：在一个实施例中，具有多个FAR的本地计算机网络（例如，网状网络）中的特定场区域路由器（FAR）将分配给本地计算机网络的公共子网前缀通告给全局计算机网络。本地计算机网络的多个FAR中的每一个被配置为接受去往本地计算机网络的任何流量，并且在多个FAR之间建立隧道覆盖。一旦在特定的FAR上收到一个目的地是本地计算机网络中的特定设备的分组，并且响应于特定的FAR没有到该特定设备的主机路由，它将隧道覆盖上的分组转发到多个本地计算机网络的FAR。

26. 发明授权

US07471636B2 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：US07471636B2
公开(公告)日：2008-12-30
申请号：US11063803
申请日：2005-02-23
申请人： Jean-Philippe Vasseur , Stefano Previdi , James N. Guichard , David D. Ward
发明人： Jean-Philippe Vasseur , Stefano Previdi , James N. Guichard , David D. Ward
IPC分类号： H04L12/26
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通过网络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。

27. 发明申请

US20060176820A1 Inter-domain optimization trigger in PCE-based environment 有权
标题翻译：基于PCE的环境中的域间优化触发
公开(公告)号：US20060176820A1
公开(公告)日：2006-08-10
申请号：US11052280
申请日：2005-02-07
申请人： Jean-Philippe Vasseur , David Ward , Muthurajah Sivabalan , Stefano Previdi
发明人： Jean-Philippe Vasseur , David Ward , Muthurajah Sivabalan , Stefano Previdi
IPC分类号： H04J3/22 , H04L12/28 , H04L12/26 , H04J1/16 , H04J3/16
CPC分类号： H04L45/42 , H04L45/02 , H04L45/04 , H04L45/32 , H04L45/50
摘要： A technique triggers optimization of a traffic engineering (TE) label switched path (LSP) that spans multiple domains of a computer network from a head-end node of a local domain to a tail-end node of a remote domain. The technique is based on the detection of an event in the remote domain (“event domain”) that could create a more optimal TE-LSP, such as, e.g., restoration of a network element or increased available bandwidth. Specifically, a path computation element (PCE) in the event domain learns of the event and notifies other PCEs of the event through an event notification. These PCEs then flood an event notification to label switched routers (LSRs) in their respective domain. Upon receiving the notification, if an LSR has one or more TE-LSPs (or pending TE-LSPs), it responds to the PCE with an optimization request for the TE-LSPs. The PCE determines whether a particular TE-LSP may benefit from optimization based on the event domain (i.e., whether the TE-LSP uses the event domain), and processes the request accordingly.
摘要翻译：一种技术触发跨越计算机网络的多个域从本地域的头端节点到远程域的尾端节点的流量工程（TE）标签交换路径（LSP）的优化。该技术基于对远程域（“事件域”）中的事件的检测，其可以创建更优化的TE-LSP，例如网络元件的恢复或增加的可用带宽。具体地，事件域中的路径计算元素（PCE）学习事件并通过事件通知通知其他PCE事件。然后，这些PCE将事件通知泛滥到其各自域中的标签交换路由器（LSR）。在收到通知后，如果LSR有一个或多个TE-LSP（或待处理的TE-LSP），则对该TEE的优先请求响应PCE。 PCE确定特定TE-LSP是否可以从基于事件域的优化（即，TE-LSP是否使用事件域）获益，并且相应地处理该请求。

28. 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。

29. 发明申请

US20060114916A1 Inter-domain TE-LSP with IGP extensions 有权
标题翻译：具有IGP扩展的域间TE-LSP
公开(公告)号：US20060114916A1
公开(公告)日：2006-06-01
申请号：US11001459
申请日：2004-12-01
申请人： Jean-Philippe Vasseur , Stefano Previdi
发明人： Jean-Philippe Vasseur , Stefano Previdi
IPC分类号： H04L12/56 , H04L12/28
CPC分类号： H04L47/825 , H04L45/02 , H04L45/04 , H04L45/28 , H04L45/502 , H04L47/70 , H04L47/724 , H04L47/785
摘要： A technique propagates reachability information for a tail-end node of a traffic engineering (TE) label switched path (LSP) to a head-end node of the TE-LSP in a computer network. The TE-LSP preferably spans multiple domains of the network such that the tail-end node resides in a domain that is different (remote) from the domain of the head-end node. The inter-domain information propagation technique employs an Interior Gateway Protocol (IGP) to transmit the remote reachability information from a target node residing in the same domain as the tail-end node to the head-end node. The head-end node uses the remote information to calculate routes, i.e., address prefixes and associated attributes, reachable from the tail-end node for insertion into its routing table.
摘要翻译：一种技术将流量工程（TE）标签交换路径（LSP）的尾端节点的可达性信息传播到计算机网络中的TE-LSP的前端节点。 TE-LSP优选地跨越网络的多个域，使得尾端节点驻留在与头端节点的域不同（远程）的域中。域间信息传播技术采用内部网关协议（IGP）来将远程可达性信息从驻留在与尾端节点相同的域中的目标节点传送到头端节点。前端节点使用远程信息来计算从尾端节点可到达其路由表的路由，即地址前缀和相关联的属性。

30. 发明授权

US07433320B2 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：US07433320B2
公开(公告)日：2008-10-07
申请号：US11048077
申请日：2005-02-01
申请人： Stefano Previdi , James N. Guichard , Jean-Philippe Vasseur , David D. Ward
发明人： Stefano Previdi , James N. Guichard , Jean-Philippe Vasseur , David D. Ward
IPC分类号： H04L12/28 , H04L12/46
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。

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