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1. 发明授权

US07855953B2 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：US07855953B2
公开(公告)日：2010-12-21
申请号：US11254468
申请日：2005-10-20
申请人： Clarence Filsfils , John Galen Scudder , Stefano B. Previdi
发明人： Clarence Filsfils , John Galen Scudder , Stefano B. Previdi
IPC分类号： H04L12/26
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。

2. 发明授权

US07983153B2 Fast reroute (FRR) protection at the edge of a RFC 2547 network 有权
标题翻译：在RFC 2547网络边缘的快速重路由（FRR）保护
公开(公告)号：US07983153B2
公开(公告)日：2011-07-19
申请号：US12481411
申请日：2009-06-09
申请人： Clarence Filsfils , Stefano B. Previdi , John Galen Scudder , David D. Ward , Jean-Philippe Vasseur , Jim Guichard
发明人： Clarence Filsfils , Stefano B. Previdi , John Galen Scudder , David D. Ward , Jean-Philippe Vasseur , Jim Guichard
IPC分类号： H04J1/16 , H04J3/14 , H04L1/00 , H04L12/26
CPC分类号： H04L45/28 , H04L45/02 , H04L45/04 , H04L45/22 , H04L45/50
摘要： In one embodiment, an edge device in a first routing domain is configured to communicate with a second routing domain via a data link. The edge device receives a data packet containing a destination address that is reachable via the second routing domain and an indication that the data packet is a protected packet that was previously rerouted from another edge device in the first routing domain via a Multi-Protocol Label Switching (MPLS) Fast Reroute (FRR) backup path. The edge device determines if communication with the second routing domain is still available via the data link, and if so, removes the indication that the data packet is a protected packet and forwards the data packet to the second routing domain, and, if not, drops the data packet to prevent the data packet from being rerouted a second time in the first routing domain on another MPLS FRR backup path.
摘要翻译：在一个实施例中，第一路由域中的边缘设备被配置为经由数据链路与第二路由域进行通信。边缘设备接收包含经由第二路由域可到达的目的地地址的数据分组，以及指示数据分组是先前通过多协议标签交换在第一路由域中从另一边缘设备重新路由的受保护分组的指示（MPLS）快速重路由（FRR）备份路径。边缘设备确定与第二路由域的通信是否仍然通过数据链路可用，如果是，则删除数据分组是受保护分组的指示，并将数据分组转发到第二路由域，如果不是，删除数据包，以防止数据包在另一个MPLS FRR备份路径上的第一个路由域再次被重新路由。

3. 发明授权

US07864669B2 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：US07864669B2
公开(公告)日：2011-01-04
申请号：US11254587
申请日：2005-10-20
申请人： Olivier Bonaventure , Pierre Francois , Clarence Filsfils , Stewart Bryant , David D. Ward , John Galen Scudder , Stefano B. Previdi , Ian Michael Charles Shand , Gargi Nalawade
发明人： Olivier Bonaventure , Pierre Francois , Clarence Filsfils , Stewart Bryant , David D. Ward , John Galen Scudder , Stefano B. Previdi , Ian Michael Charles Shand , Gargi Nalawade
IPC分类号： H04L12/26
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。

4. 发明授权

US07639688B2 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：US07639688B2
公开(公告)日：2009-12-29
申请号：US11183381
申请日：2005-07-18
申请人： Clarence Filsfils , Stefano B. Previdi , John Galen Scudder , David D. Ward
发明人： Clarence Filsfils , Stefano B. Previdi , John Galen Scudder , David D. 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。

5. 发明申请

US20090245259A1 FAST REROUTE (FRR) PROTECTION AT THE EDGE OF A RFC 2547 NETWORK 有权
标题翻译：快速REROUTE（FRR）保护在RFC 2547网络的边缘
公开(公告)号：US20090245259A1
公开(公告)日：2009-10-01
申请号：US12481411
申请日：2009-06-09
申请人： Clarence Filsfils , Stefano B. Previdi , John Galen Scudder , David D. Ward , Jean-Philippe Vasseur , Jim Guichard
发明人： Clarence Filsfils , Stefano B. Previdi , John Galen Scudder , David D. Ward , Jean-Philippe Vasseur , Jim Guichard
IPC分类号： H04L12/56
CPC分类号： H04L45/28 , H04L45/02 , H04L45/04 , H04L45/22 , H04L45/50
摘要： In one embodiment, an edge device in a first routing domain is configured to communicate with a second routing domain via a data link. The edge device receives a data packet containing a destination address that is reachable via the second routing domain and an indication that the data packet is a protected packet that was previously rerouted from another edge device in the first routing domain via a Multi-Protocol Label Switching (MPLS) Fast Reroute (FRR) backup path. The edge device determines if communication with the second routing domain is still available via the data link, and if so, removes the indication that the data packet is a protected packet and forwards the data packet to the second routing domain, and, if not, drops the data packet to prevent the data packet from being rerouted a second time in the first routing domain on another MPLS FRR backup path.
摘要翻译：在一个实施例中，第一路由域中的边缘设备被配置为经由数据链路与第二路由域进行通信。边缘设备接收包含经由第二路由域可到达的目的地地址的数据分组，以及指示数据分组是先前通过多协议标签交换在第一路由域中从另一边缘设备重新路由的受保护分组的指示（MPLS）快速重路由（FRR）备份路径。边缘设备确定与第二路由域的通信是否仍然通过数据链路可用，如果是，则删除数据分组是受保护分组的指示，并将数据分组转发到第二路由域，如果不是，删除数据包，以防止数据包在另一个MPLS FRR备份路径上的第一个路由域再次被重新路由。

6. 发明授权

US07551551B2 Fast reroute (FRR) protection at the edge of a RFC 2547 network 有权
标题翻译：在RFC 2547网络边缘的快速重路由（FRR）保护
公开(公告)号：US07551551B2
公开(公告)日：2009-06-23
申请号：US11010225
申请日：2004-12-10
申请人： Clarence Filsfils , Stefano B. Previdi , John Galen Scudder , David D. Ward , Jean-Philippe Vasseur , Jim Guichard
发明人： Clarence Filsfils , Stefano B. Previdi , John Galen Scudder , David D. Ward , Jean-Philippe Vasseur , Jim Guichard
IPC分类号： H04J1/16 , H04J3/14 , H04L1/00 , 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.
摘要翻译：可以部署在具有耦合到相邻路由域的第一和第二边缘设备的网络边缘的快速重路由（FRR）技术。如果第一边缘设备检测到阻止其与相邻域通信的节点或链路故障，则第一边缘设备将寻址到相邻域的至少一些数据分组路由到第二边缘设备。第二边缘设备接收重新路由的报文，然后将报文转发给邻近的域。值得注意的是，第二边缘设备不允许第二次重新路由所接收的分组，例如在识别出另一个域间节点或链路故障时。因此，在网络的边缘避免了循环，并且与先前的实现相比，分组被更快地和更有效地重新路由到相邻路由域。

7. 发明授权

US07852772B2 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：US07852772B2
公开(公告)日：2010-12-14
申请号：US11254609
申请日：2005-10-20
申请人： Clarence Filsfils , Stewart Bryant , Ian Michael Charles Shand , David D. Ward , John Galen Scudder
发明人： Clarence Filsfils , Stewart Bryant , Ian Michael Charles Shand , David D. Ward , John Galen Scudder
IPC分类号： H04L12/26
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。

8. 发明授权

US07496650B1 Identifying and suppressing transient routing updates 有权
标题翻译：识别和抑制瞬态路由更新
公开(公告)号：US07496650B1
公开(公告)日：2009-02-24
申请号：US10811626
申请日：2004-03-29
申请人： Stefano Benedetto Previdi , John Galen Scudder , Clarence Filsfils , David Delano Ward
发明人： Stefano Benedetto Previdi , John Galen Scudder , Clarence Filsfils , David Delano Ward
IPC分类号： G06F15/173 , G01R31/08 , H04L12/28
CPC分类号： H04L45/028 , H04L45/22 , H04L45/28 , H04L45/48 , H04L69/14 , H04L69/40
摘要： One or more sets of routing information are maintained. A network topology change indication of a progressive series of network changes is received, with at least one more associated network topology change indication of the progressive series of network changes expected to be received in the future. An updated set of routing information is computed based on the network topology change indication, and a determination is made as to whether or not the updated set of routing information changes nexthop information for one or more routes. In response to determining that the new set of routing information does not change nexthop information for said one or more routes and given the expectation of at least one more associated network topology change indication of the progressive series of network changes is expected to be received in the future, the routing information is not updated based on the updated set of routing information.
摘要翻译：维护一组或多组路由信息。接收到逐渐的一系列网络改变的网络拓扑变化指示，其中至少一个更多关联的网络拓扑改变预期在将来接收的渐进的一系列网络变化的指示。基于网络拓扑变化指示计算更新的路由信息集合，并且确定更新的路由信息集合是否改变一个或多个路由的下一跳信息。响应于确定新的路由信息集合不会改变用于所述一个或多个路由的下一跳信息，并且给出期望至少一个更相关联的网络拓扑结构的变化指示逐渐的一系列网络改变将在未来，路由信息不会根据更新的路由信息集进行更新。

9. 发明授权

US09143431B2 Hiding a service node in a network from a network routing topology 有权
标题翻译：从网络路由拓扑中隐藏网络中的服务节点
公开(公告)号：US09143431B2
公开(公告)日：2015-09-22
申请号：US12981444
申请日：2010-12-29
申请人： Pradosh Mohapatra , Stefano B. Previdi , Clarence Filsfils , David Ward
发明人： Pradosh Mohapatra , Stefano B. Previdi , Clarence Filsfils , David Ward
IPC分类号： H04L12/28 , H04L12/751
CPC分类号： H04L45/025
摘要： Hiding a service node in a network from a network topology is provided. In one embodiment, for example, an apparatus for hiding a service node in a network from a network topology, the apparatus comprising: a network interface; a processor; and one or more stored sequences of instructions which, when executed by the processor, cause the processor to perform: discovering a service node in a data network in accordance with a link-state protocol wherein the service node provides a network topology dependent service other than packet forwarding; establishing a link-state adjacency with the service node and one or more packet forwarding nodes in accordance with the link-state protocol; receiving a link-state advertisement; in response to identifying the link-state advertisement as an originating link-state advertisement sent from the service node, suppressing flooding of the received link-state advertisement to the one or more packet forwarding nodes.
摘要翻译：提供了从网络拓扑中隐藏网络中的服务节点。在一个实施例中，例如，一种用于从网络拓扑中隐藏网络中的服务节点的装置，所述装置包括：网络接口; 处理器以及一个或多个存储的指令序列，当由所述处理器执行时，所述指令序列使所述处理器执行：根据链路状态协议在数据网络中发现服务节点，其中所述服务节点提供除分组转发; 根据链路状态协议与服务节点和一个或多个分组转发节点建立链路状态邻接; 接收链接状态广告; 响应于将所述链路状态广告识别为从所述服务节点发送的始发链路状态广告，抑制所接收的链路状态广告对所述一个或多个分组转发节点的洪泛。

10. 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。

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