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1. 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。

2. 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。

3. 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。

4. 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。

5. 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。

6. 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。

7. 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.

8. 发明申请

US20070091793A1 Method and apparatus for managing forwarding of data in an autonomous system 有权
标题翻译：用于管理自主系统中的数据转发的方法和装置
公开(公告)号：US20070091793A1
公开(公告)日：2007-04-26
申请号：US11254468
申请日：2005-10-20
申请人： Clarence Filsfils , John Scudder , Stefano Previdi
发明人： Clarence Filsfils , John Scudder , Stefano Previdi
IPC分类号： H04J3/14 , H04L12/56
CPC分类号： H04L45/22 , H04L12/4633 , H04L45/04 , H04L45/28 , H04L45/50
摘要： A method of managing forwarding of data in a first autonomous system (AS) is described. The first AS includes a plurality of border routers having inter-domain links to one or more remote AS's and an associated exterior communications protocol. The border routers use an interior communications protocol with other border routers in the first AS using primary tunnels. The method comprises the steps, performed at a first border router having a primary route via an inter-domain link to a remote AS, of constructing an alternate route to the remote AS via second border router in the first AS, instigating a backup tunnel to the second border router upon failure of the primary route and sending a failure message to the other border routers.
摘要翻译：描述了在第一自治系统（AS）中管理数据转发的方法。第一AS包括具有到一个或多个远程AS的域间链接和相关联的外部通信协议的多个边界路由器。边界路由器使用内部通信协议与第一AS中的其他边界路由器使用主隧道。该方法包括以下步骤：在具有通过到远程AS的域间链路的主路由的第一边界路由器上执行的步骤，通过第一AS中的第二边界路由器构建到远程AS的备用路由，将备用隧道引导到主路由器故障时的第二个边界路由器，并向其他边界路由器发送故障消息。

9. 发明申请

US20050135256A1 System and method for distributing route selection in an implementation of a routing protocol 有权
标题翻译：在路由协议实现中分配路由选择的系统和方法
公开(公告)号：US20050135256A1
公开(公告)日：2005-06-23
申请号：US10743973
申请日：2003-12-23
申请人： David Ball , R. Bennett , Martin Hesketh , John Scudder , David Ward
发明人： David Ball , R. Bennett , Martin Hesketh , John Scudder , David Ward
IPC分类号： H04L1/00 , H04L12/56
CPC分类号： H04L45/56 , H04L45/04 , H04L45/12 , H04L45/44
摘要： A partial best path technique distributes route selection in a routing protocol implementation on a router. The technique also ensures that announced paths received from peers of the router (i.e., a “load”) are compared in a correct order to select best paths that are then used by the router to forward packets and to advertise to the peers. When employed in a distributed architecture, the technique further reduces memory usage. To that end, the partial best path technique enhances a best path selection algorithm executed by the router to enable dispersion of the received path load among processing nodes or elements of the router, while maintaining the ordering requirement of the algorithm. The partial best path technique essentially provides an enhancement to the best path selection algorithm that selects a subset of paths from a plurality of paths, with that subset being the minimal subset needed to select the best paths.
摘要翻译：部分最佳路径技术在路由器上的路由协议实现中分配路由选择。该技术还确保从路由器的对等端（即，“负载”）接收到的公告路径以正确的顺序进行比较，以选择最佳路径，然后由路由器用于转发数据包并向对等体通告。当在分布式架构中使用时，该技术进一步减少内存使用。为此，部分最佳路径技术增强了由路由器执行的最佳路径选择算法，以便在维护该算法的排序要求的同时，使路由器的处理节点或元素之间的接收路径负载分散。部分最佳路径技术基本上为最佳路径选择算法提供了增强，该算法从多个路径中选择路径的子集，该子集是选择最佳路径所需的最小子集。

10. 发明申请

US20060209851A1 Method and apparatus for border gateway protocol route management and routing policy modeling 有权
公开(公告)号：US20060209851A1
公开(公告)日：2006-09-21
申请号：US11073351
申请日：2005-03-04
申请人： John Scudder , David Ward , Thomas Barron
发明人： John Scudder , David Ward , Thomas Barron
IPC分类号： H04L12/56 , H04L12/28
CPC分类号： H04L45/22 , H04L45/02 , H04L45/04 , H04L45/308 , H04L45/54
摘要： A method and apparatus is described for Border Gateway Protocol (BGP) route management and routing policy modeling. In one aspect, the performance of one or more actions associated with one or more routes is disallowed. One or more routing policies associated with the one or more routes are configured. The performance of the one or more actions is then allowed. In one feature of the aspect, the one or more actions comprise forwarding packets on the one or more routes. The one or more actions may also comprise advertising the one or more routes to BGP peers.

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