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41. 发明申请

US20130336126A1 TIME-BASED SCHEDULING FOR TUNNELS COMPUTED BY A STATEFUL PATH COMPUTATION ELEMENT 有权
标题翻译：一个稳定的路径计算元素计算的隧道的基于时间的调度
公开(公告)号：US20130336126A1
公开(公告)日：2013-12-19
申请号：US13524751
申请日：2012-06-15
申请人： Jean-Philippe Vasseur , Stefano Previdi , Clarence Filsfils , George Swallow
发明人： Jean-Philippe Vasseur , Stefano Previdi , Clarence Filsfils , George Swallow
IPC分类号： H04L12/24 , H04L12/26
CPC分类号： H04L41/0896 , H04L41/147 , H04L47/823 , H04L47/825 , H04L47/826
摘要： In one embodiment, a path computation element (PCE) in a computer network receives one or more path computation requests (PCReqs), and records a time of each PCReq and the corresponding requested bandwidth. Based on this information, the PCE may determine a traffic profile of the computer network, and may augment a traffic engineering database (TED) with requested bandwidth according to time based on the traffic profile. As such, prior to a particular time, the PCE may determine placement of tunnels within the traffic profile for the particular time.
摘要翻译：在一个实施例中，计算机网络中的路径计算元件（PCE）接收一个或多个路径计算请求（PCReq），并记录每个PCReq的时间和相应的请求带宽。基于该信息，PCE可以确定计算机网络的流量简档，并且可以基于流量简档来根据时间来增加具有所请求带宽的流量工程数据库（TED）。因此，在特定时间之前，PCE可以在特定时间内确定隧道在业务简档内的布置。

42. 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。

43. 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。

44. 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。

45. 发明授权

US08111702B1 Configuring route properties for use in transport tree building 有权
标题翻译：配置用于传输树构建的路由属性
公开(公告)号：US08111702B1
公开(公告)日：2012-02-07
申请号：US11960985
申请日：2007-12-20
申请人： Ijsbrand Wijnands , Arjen Boers , Toerless Eckert , Stefano Previdi
发明人： Ijsbrand Wijnands , Arjen Boers , Toerless Eckert , Stefano Previdi
IPC分类号： H04L12/28
CPC分类号： H04L45/48 , H04L45/50 , H04L45/64
摘要： A mechanism is provided by which a transport tree identifier can be generated comprising both an opaque field, containing information that cannot be interpreted by core routers, and a non-opaque field, containing information that can be interpreted by core routers. The transport tree identifier is then used in the process of building a transport tree across a transport network. A transport network egress router can receive a request to join a multicast datastream from a downstream node outside of the transport network. The information contained in the join message that identifies the desired multicast datastream is encoded in the opaque field of the transport tree identifier. Information related to desired route properties is encoded in the non-opaque field, for interpretation by the core routers. The non-opaque field can also include an identifier of a root node core router for the transport tree. Route properties can be provided, for example, by selection and transmission from the customer itself, or route properties can be associated with a particular customer or associated with a port of an egress router coupled to the customer network.
摘要翻译：提供了一种机制，通过该机制可以生成传输树标识符，包括包含不能被核心路由器解释的信息的不透明字段和包含可由核心路由器解释的信息的非不透明字段。然后，传输树标识符用于跨传输网络构建传输树的过程。传输网络出口路由器可以从传输网络外部的下游节点接收到加入组播数据流的请求。标识期望的多播数据流的加入消息中包含的信息被编码在传输树标识符的不透明字段中。与所需路由属性相关的信息在非不透明字段中进行编码，以供核心路由器进行解释。非不透明字段还可以包括用于传输树的根节点核心路由器的标识符。可以例如通过从客户本身的选择和传输来提供路由属性，或者路由属性可以与特定客户相关联或者与耦合到客户网络的出口路由器的端口相关联。

46. 发明授权

US07646739B2 Multicast routing over unidirectional links 有权
标题翻译：通过单向链路进行组播路由
公开(公告)号：US07646739B2
公开(公告)日：2010-01-12
申请号：US11099245
申请日：2005-04-05
申请人： Stefano Previdi , Dino Farinacci , Ijsbrand Wijnands
发明人： Stefano Previdi , Dino Farinacci , Ijsbrand Wijnands
IPC分类号： H04H20/71
CPC分类号： H04L12/1836 , H04L12/5692 , H04L45/00 , H04L45/16
摘要： Various systems and methods are disclosed for performing multicast routing over unidirectional links. For example, one method involves maintaining a multicast adjacency state, which is associated with an interface that is coupled to receive messages from a network device via a unidirectional link. The multicast adjacency state identifies a network address of the network device. The method also involves sending a multicast protocol control message to the network device via a bidirectional path. The destination address of the network multicast protocol control message is the network address in the multicast adjacency state.
摘要翻译：公开了用于通过单向链路执行组播路由的各种系统和方法。例如，一种方法涉及维护多播邻接状态，该状态与被耦合以经由单向链路从网络设备接收消息的接口相关联。组播邻接状态标识网络设备的网络地址。该方法还涉及通过双向路径向网络设备发送组播协议控制消息。网络组播协议控制消息的目的地址是组播邻接状态的网络地址。

47. 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。

48. 发明申请

US20070097974A1 Distributed border gateway protocol (BGP) route reflector system 审中-公开
标题翻译：分布式边界网关协议（BGP）路由反射器系统
公开(公告)号：US20070097974A1
公开(公告)日：2007-05-03
申请号：US11262061
申请日：2005-10-28
申请人： David Ward , John Scudder , Stefano Previdi , Clarence Filsfils , Robert Raszuk
发明人： David Ward , John Scudder , Stefano Previdi , Clarence Filsfils , Robert Raszuk
IPC分类号： H04L12/56 , H04J3/22 , H04L12/28 , H04J3/16
CPC分类号： H04L45/02 , H04L45/04 , H04L45/46
摘要： A packet data router comprises one or more first circuit boards comprising one or more first processors and first logic circuits programmed to perform packet data forwarding and packet data router control plane functions; and one or more second circuit boards comprising one or more second processors and second logic circuits programmed to perform only Border Gateway Protocol (BGP) route reflection server (RRS) functions. A distributed BGP route reflector system with the disclosed architecture distributes route reflection server software to a dedicated control board so that processing route reflection functions does not impact packet forwarding or protocol instances that converge forwarding tables.
摘要翻译：分组数据路由器包括一个或多个第一电路板，包括一个或多个第一处理器和被编程为执行分组数据转发和分组数据路由器控制平面功能的第一逻辑电路; 以及一个或多个第二电路板，包括一个或多个第二处理器和第二逻辑电路，其被编程为仅执行边界网关协议（BGP）路由反射服务器（RRS）功能。具有所公开架构的分布式BGP路由反射器系统将路由反射服务器软件分发到专用控制板，使得处理路由反射功能不会影响转发表的汇聚转发或协议实例。

49. 发明申请

US20070014293A1 Automatic protection of an SP infrastructure against exterior traffic 有权
标题翻译：自动保护SP基础设施免受外部流量的影响
公开(公告)号：US20070014293A1
公开(公告)日：2007-01-18
申请号：US11183381
申请日：2005-07-18
申请人： Clarence Filsfils , Stefano Previdi , John Scudder , David Ward
发明人： Clarence Filsfils , Stefano Previdi , John Scudder , David Ward
IPC分类号： H04L12/56
CPC分类号： H04L45/742 , H04L45/04 , H04L63/10
摘要： A method and system for protecting valuable resources within an autonomous system network. Address prefixes within the system are designated as valuable and a flag bit is associated with the address within routing tables of routers of the network. Interfaces to border routers are identified and when packets are received at those interfaces, the packets are flagged with a flag or tag bit. The destination address of the received packet is compared to the flag bit associated with the valuable resource prefix, and if the packet is directed to that resource the packet is dropped and/or logged, but the packet is not forwarded to that resource. In specific cases an interface from an external source may be configured to not create the flag or tag bit, wherein that packet will be delivered to the destination prefix of the packet.
摘要翻译：一种用于保护自治系统网络内有价值资源的方法和系统。系统中的地址前缀被指定为有价值的，并且标志位与网络的路由器的路由表中的地址相关联。识别到边界路由器的接口，并且当在这些接口处接收到分组时，分组被标记为标志或标记位。将接收到的分组的目的地地址与与有价值的资源前缀相关联的标志位进行比较，并且如果分组指向该资源，则分组被丢弃和/或记录，但是分组不被转发到该资源。在特定情况下，来自外部源的接口可以被配置为不创建标志或标记位，其中该分组将被传递到分组的目的地前缀。

50. 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。

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