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1. 发明授权

US07957306B2 Providing reachability information in a routing domain of an external destination address in a data communications network 有权
标题翻译：在数据通信网络中的外部目的地地址的路由域中提供可达性信息
公开(公告)号：US07957306B2
公开(公告)日：2011-06-07
申请号：US11518383
申请日：2006-09-08
申请人： Stewart F. Bryant , Mike Shand , Gargi Nalawade , Robert Raszuk , Keyur Patel , David D. Ward , Clarence Filsfils , Stefano B. Previdi
发明人： Stewart F. Bryant , Mike Shand , Gargi Nalawade , Robert Raszuk , Keyur Patel , David D. Ward , Clarence Filsfils , Stefano B. Previdi
IPC分类号： H04L12/26 , H04L12/66 , G06F15/16
CPC分类号： H04L45/22 , H04L45/02 , H04L45/04 , H04L45/28
摘要： An apparatus for providing reachability in a routing domain of a data communications network having as components nodes and links therebetween for a routing domain external destination address is provided. The apparatus is arranged to advertise destination address reachability internally to nodes in the routing domain and associate a reachability category with the internal advertisement of the destination address reachability.
摘要翻译：提供了一种用于在数据通信网络的路由域中提供可达性的装置，其具有用于路由域外部目的地地址的节点和链路之间的组件。该设备被布置为在路由域中的节点内部向目的地址可达性通告，并将可达性类别与目的地址可达性的内部广告相关联。

2. 发明申请

US20080062986A1 Providing reachability information in a routing domain of an external destination address in a data communications network 有权
标题翻译：在数据通信网络中的外部目的地地址的路由域中提供可达性信息
公开(公告)号：US20080062986A1
公开(公告)日：2008-03-13
申请号：US11518383
申请日：2006-09-08
申请人： Mike Shand , Stewart F. Bryant , David D. Ward , Gargi Nalawade , Keyur Patel , Clarence Filsfils , Stefano B. Previdi , Robert Raszuk
发明人： Mike Shand , Stewart F. Bryant , David D. Ward , Gargi Nalawade , Keyur Patel , Clarence Filsfils , Stefano B. Previdi , Robert Raszuk
IPC分类号： H04L12/56
CPC分类号： H04L45/22 , H04L45/02 , H04L45/04 , H04L45/28
摘要： An apparatus for providing reachability in a routing domain of a data communications network having as components nodes and links therebetween for a routing domain—external destination address is described. The apparatus is arranged to advertise destination address reachability internally to nodes in the routing domain and associate a reachability category with said internal advertisement of said destination address reachability.
摘要翻译：描述了一种用于在数据通信网络的路由域中提供可达性的装置，其具有用于路由域 - 外部目的地地址之间的节点和链路之间的组件。该装置被布置为在内部向路由域中的节点通告目的地址可达性，并将可达性类别与所述目的地址可达性的所述内部广告相关联。

3. 发明授权

US08264962B2 System and method for dynamically responding to event-based traffic redirection 有权
标题翻译：用于动态响应基于事件的流量重定向的系统和方法
公开(公告)号：US08264962B2
公开(公告)日：2012-09-11
申请号：US11168694
申请日：2005-06-27
申请人： Jean-Philippe Vasseur , David D. Ward , Stefano B. Previdi , Clarence Filsfils
发明人： Jean-Philippe Vasseur , David D. Ward , Stefano B. Previdi , Clarence Filsfils
IPC分类号： G01R31/08
CPC分类号： H04L45/22 , H04L45/02 , H04L45/28 , H04L47/70 , H04L47/746 , H04L47/762 , H04L47/825 , H04L47/829
摘要： A technique dynamically resizes Traffic Engineering (TE) Label Switched Paths (LSPs) at a head-end node of the TE-LSPs in preparation to receive redirected traffic in response to an event in a computer network. The novel dynamic TE-LSP resizing technique is based on the detection of an event in the network that could cause traffic destined for one or more other (“remote”) head-end nodes of one or more TE-LSPs to be redirected to an event-detecting (“local”) head-end node of one or more TE-LSPs. An example of such a traffic redirection event is failure of a remote head-end node or failure of any of its TE-LSPs. Specifically, the local head-end node maintains TE-LSP steady state sampling and resizing frequencies to adapt the bandwidth of its TE-LSP(s) to gradual changes in the network over time. Upon detection of an event identifying possible traffic redirection, the local head-end node enters a Fast Resize (FR) state, in which the sampling and resizing frequencies are increased to quickly adapt the TE-LSP bandwidth(s) to any received redirected traffic.
摘要翻译：技术动态地调整TE-LSP的头端节点处的流量工程（TE）标签交换路径（LSP），准备响应于计算机网络中的事件接收重定向的流量。新型动态TE-LSP调整大小技术是基于网络中可能导致一个或多个TE-LSP的一个或多个其他（“远程”）头端节点的流量被重定向到的事件的检测。一个或多个TE-LSP的事件检测（“本地”）头端节点。这种流量重定向事件的示例是远程头端节点的故障或其任何TE-LSP的故障。具体来说，本地前端节点维护TE-LSP稳态采样和调整频率，以适应其TE-LSP的带宽随时间逐渐变化的网络。在检测到识别可能的业务重定向的事件时，本地前端节点进入快速调整大小（FR）状态，其中增加采样和调整大小频率以快速地将TE-LSP带宽适配到任何接收到的重定向业务。

4. 发明授权

US08082340B2 Technique for distinguishing between link and node failure using bidirectional forwarding detection (BFD) 有权
标题翻译：使用双向转发检测（BFD）区分链路和节点故障的技术
公开(公告)号：US08082340B2
公开(公告)日：2011-12-20
申请号：US11343051
申请日：2006-01-30
申请人： Clarence Filsfils , David D. Ward
发明人： Clarence Filsfils , David D. Ward
IPC分类号： G06F15/173
CPC分类号： H04L45/00 , H04L12/40 , H04L12/413 , H04L41/069 , H04L41/12 , H04L43/00 , H04L45/28
摘要： A technique distinguishes between link and node failure using bidirectional forwarding detection (BFD) in a computer network. According to the novel technique, a BFD session is established over a first link between a monitoring node and a first interface of a monitored node. In addition, one or more novel unidirectional BFD (uBFD) sessions from one or more corresponding other interfaces of the monitored node to the monitoring node (e.g., as configured by the monitored node to detect its failure), the one or more uBFD sessions traversing links other than the first link (e.g., “not-via” the monitored node) are established, the one or more uBFD sessions traversing links other than the first link (e.g., “not-via” the monitored node). For instance, the one or more uBFD sessions correspond to one or more line cards of the monitored node. In response to detecting a lack of connectivity resulting from, e.g., failure of the BFD session, the monitoring node determines that the first link has failed if at least one uBFD session is operational. Moreover, in response to detecting failure of the BFD session and all of the one or more uBFD sessions, the monitoring node determines that the monitored node has failed.
摘要翻译：一种技术在计算机网络中使用双向转发检测（BFD）来区分链路和节点故障。根据这种新技术，在被监控节点的监控节点和第一个接口之间的第一个链路上建立BFD会话。另外，一个或多个新颖的单向BFD（uBFD）会话从受监视节点的一个或多个对应的其他接口到监视节点（例如，由监视节点配置以检测其故障），一个或多个uBFD会话遍历建立除第一链路之外的其他链路（例如，“未通过”的被监视节点），一个或多个遍历第一链路以外的链路的uBFD会话（例如，“不通过被监控节点”）。例如，一个或多个uBFD会话对应于被监视节点的一个或多个线路卡。响应于检测到由于例如BFD会话的故障而导致的连接的缺乏，如果至少一个uBFD会话可操作，则监视节点确定第一链路已经失败。此外，响应于检测到BFD会话和所有一个或多个uBFD会话的故障，监视节点确定被监控节点已经失败。

5. 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。

6. 发明授权

US07765306B2 Technique for enabling bidirectional forwarding detection between edge devices in a computer network 有权
标题翻译：用于在计算机网络中的边缘设备之间启用双向转发检测的技术
公开(公告)号：US07765306B2
公开(公告)日：2010-07-27
申请号：US11342446
申请日：2006-01-30
申请人： Clarence Filsfils , David D. Ward
发明人： Clarence Filsfils , David D. Ward
IPC分类号： G06F15/16 , G06F15/177
CPC分类号： H04L45/22 , H04L45/02 , H04L45/04 , H04L45/28
摘要： A technique enables bidirectional forwarding detection (BFD) between first and second edge devices in a computer network, wherein the second edge device is not configured for BFD. According to the novel technique, a BFD Echo session is established from the first edge device to the first edge device via the second edge device, i.e., along a monitored path (e.g., a single link). Also, an external border gateway protocol (eBGP) session is established between the first and second edge devices over an alternate path (e.g., an eBGP multi-hop session). The first edge device determines that the monitored path is down upon not receiving a returned BFD Echo message from the second edge device. In response, the first edge device notifies the second edge device that the monitored path is down through the eBGP session over the alternate path. Notably, upon notifying the second edge device that the monitored path is down, the first edge device breaks the eBGP session, and upon receiving the notification, the second edge device also breaks the eBGP session.
摘要翻译：一种技术在计算机网络中的第一和第二边缘设备之间实现双向转发检测（BFD），其中第二边缘设备不配置用于BFD。根据该新技术，经由第二边缘设备，即沿着被监视的路径（例如，单个链路），从第一边缘设备到第一边缘设备建立BFD回波会话。另外，通过备用路径（例如，eBGP多跳会话）在第一和第二边缘设备之间建立外部边界网关协议（eBGP）会话。第一边缘设备确定在没有从第二边缘设备接收到返回的BFD Echo消息时，所监视的路径下降。作为响应，第一边缘设备通过备用路径通过eBGP会话通知第二边缘设备所监视的路径正在关闭。值得注意的是，当通知第二边缘设备被监控的路径关闭时，第一边缘设备破坏eBGP会话，并且在接收到该通知时，第二边缘设备也中断eBGP会话。

7. 发明申请

US20080062861A1 Constructing a repair path in the event of non-availability of a routing domain 有权
标题翻译：在路由域不可用的情况下构建修复路径
公开(公告)号：US20080062861A1
公开(公告)日：2008-03-13
申请号：US11518382
申请日：2006-09-08
申请人： Mike Shand , Stewart F. Bryant , David D. Ward , Gargi Nalawade , Robert Raszuk , Keyur Patel , Clarence Filsfils , Stefano B. Previdi
发明人： Mike Shand , Stewart F. Bryant , David D. Ward , Gargi Nalawade , Robert Raszuk , Keyur Patel , Clarence Filsfils , Stefano B. Previdi
IPC分类号： H04J3/14
CPC分类号： H04L45/04 , H04L45/02 , H04L45/28
摘要： In one embodiment, an apparatus and method are described for constructing a repair path in the event of non-availability of a routing domain component of a routing domain comprising, as components, links and nodes. The apparatus is arranged to receive respective network repair addresses from each of the far-side and near-side advertising node for use in the event of non-availability of a routing domain component between the advertising node. The apparatus is further arranged to advertise the near-side advertising node network repair address to one or more far-side nodes via a path external to the routing domain.
摘要翻译：在一个实施例中，描述了在路由域的路由域组件的不可用性的情况下构建修复路径的装置和方法，该路由域组件包括作为组件的链路和节点。该装置被安排为从广播节点和广播节点之间的路由域组件不可用的情况下接收来自远侧和近侧广告节点的相应网络修复地址。该装置还被布置成经由路由域外部的路径将近侧广告节点网络修复地址通告给一个或多个远侧节点。

8. 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。

9. 发明授权

US07961600B2 Loop prevention technique for MPLS using service labels 有权
标题翻译：使用服务标签的MPLS环路防护技术
公开(公告)号：US07961600B2
公开(公告)日：2011-06-14
申请号：US12694038
申请日：2010-01-26
申请人： Clarence Filsfils , David D. Ward , Stefano B. Previdi , Jean-Philippe Vasseur , Jim Guichard , Robert Raszuk
发明人： Clarence Filsfils , David D. Ward , Stefano B. Previdi , Jean-Philippe Vasseur , Jim Guichard , Robert Raszuk
IPC分类号： H04L12/26
CPC分类号： H04L45/18 , H04L45/04 , H04L45/22 , H04L45/28 , H04L45/50
摘要： In one embodiment, a loss of communication is detected between a first edge device of a computer network and a neighboring routing domain. A data packet is received at the first edge device, where the received data packet contains a destination address that is reachable via the neighboring routing domain. A determination is made whether a service label is located in a Multi-Protocol Label Switching (MPLS) label stack included in the received data packet. A service label in the MPLS label stack indicates that the received data packet was previously rerouted in accordance with fast reroute (FRR) operations. In response to a determination that the received data packet does not include a service label in the MPLS label stack, the received data packet is rerouted to a second edge device of the computer network for forwarding to the neighboring routing domain.
摘要翻译：在一个实施例中，在计算机网络的第一边缘设备和相邻路由域之间检测到通信丢失。在第一边缘设备处接收数据分组，其中所接收的数据分组包含经由相邻路由域可到达的目的地地址。确定服务标签是否位于包含在所接收的数据分组中的多协议标签交换（MPLS）标签栈中。 MPLS标签堆栈中的服务标签表示接收到的数据包是根据快速重路由（FRR）操作先前重新路由的。响应于接收到的数据分组在MPLS标签堆栈中不包括服务标签的确定，所接收的数据分组被重新路由到计算机网络的第二边缘设备以转发到相邻路由域。

10. 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。

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