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1. 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。

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. 发明申请

US20090147674A1 LOOP PREVENTION TECHNIQUES USING ENCAPSULATION MANIPULATION OF IP/MPLS FIELD 有权
标题翻译：使用IP / MPLS领域的加密处理的环路预防技术
公开(公告)号：US20090147674A1
公开(公告)日：2009-06-11
申请号：US12348766
申请日：2009-01-05
申请人： John Galen Scudder , David D. Ward , Clarence Filsfils
发明人： John Galen Scudder , David D. Ward , Clarence Filsfils
IPC分类号： G06F11/00
CPC分类号： H04L45/22 , H04L45/02 , H04L45/28 , H04L45/50 , H04L47/2408
摘要： In one embodiment, an edge device communicates with a neighboring routing domain. A failure that prevents communication between the edge device and the neighboring routing is detected. When the edge device thereafter receives a data packet that is directed to the neighboring routing domain, it determines if the received data packet was rerouted to the edge device from another edge device coupled to the neighboring routing domain. If the received data packet was not rerouted to the edge device from another edge device coupled to the neighboring routing domain, the edge device reroutes the received data packet to another edge device for forwarding to the neighboring routing domain. However, if the received data packet was rerouted to the edge device from another edge device coupled to the neighboring routing domain, the edge device prevents the received data packet from being rerouted a second time to prevent loops.
摘要翻译：在一个实施例中，边缘设备与相邻路由域通信。检测到阻止边缘设备和相邻路由之间的通信的故障。当边缘设备此后接收到指向相邻路由域的数据分组时，它确定所接收的数据分组是否从耦合到相邻路由域的另一边缘设备重新路由到边缘设备。如果接收到的数据分组没有从耦合到相邻路由域的另一边缘设备重新路由到边缘设备，则边缘设备将接收到的数据分组重新路由到另一个边缘设备，以转发到相邻路由域。然而，如果接收到的数据分组从耦合到相邻路由域的另一边缘设备重新路由到边缘设备，则边缘设备第二次防止接收到的数据分组被重新路由以防止环路。

8. 发明授权

US07869345B2 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：US07869345B2
公开(公告)日：2011-01-11
申请号：US12348766
申请日：2009-01-05
申请人： John Galen Scudder , David D. Ward , Clarence Filsfils
发明人： John Galen Scudder , David D. Ward , Clarence Filsfils
IPC分类号： H04L12/56
CPC分类号： H04L45/22 , H04L45/02 , H04L45/28 , H04L45/50 , H04L47/2408
摘要： In one embodiment, an edge device communicates with a neighboring routing domain. A failure that prevents communication between the edge device and the neighboring routing is detected. When the edge device thereafter receives a data packet that is directed to the neighboring routing domain, it determines if the received data packet was rerouted to the edge device from another edge device coupled to the neighboring routing domain. If the received data packet was not rerouted to the edge device from another edge device coupled to the neighboring routing domain, the edge device reroutes the received data packet to another edge device for forwarding to the neighboring routing domain. However, if the received data packet was rerouted to the edge device from another edge device coupled to the neighboring routing domain, the edge device prevents the received data packet from being rerouted a second time to prevent loops.
摘要翻译：在一个实施例中，边缘设备与相邻路由域通信。检测到阻止边缘设备和相邻路由之间的通信的故障。当边缘设备此后接收到指向相邻路由域的数据分组时，它确定所接收的数据分组是否从耦合到相邻路由域的另一边缘设备重新路由到边缘设备。如果接收到的数据分组没有从耦合到相邻路由域的另一边缘设备重新路由到边缘设备，则边缘设备将接收到的数据分组重新路由到另一个边缘设备，以转发到相邻路由域。然而，如果接收到的数据分组从耦合到相邻路由域的另一边缘设备重新路由到边缘设备，则边缘设备第二次防止接收到的数据分组被重新路由以防止环路。

9. 发明授权

US07477593B2 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：US07477593B2
公开(公告)日：2009-01-13
申请号：US11098173
申请日：2005-04-04
申请人： John Galen Scudder , David D. Ward , Clarence Filsfils
发明人： John Galen Scudder , David D. Ward , Clarence Filsfils
IPC分类号： H04L12/56
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。

10. 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。

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