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1. 发明授权

US09054951B2 Detecting and avoiding routing loops with BGP route server extensions 有权
标题翻译：使用BGP路由服务器扩展检测和避免路由环路
公开(公告)号：US09054951B2
公开(公告)日：2015-06-09
申请号：US13098628
申请日：2011-05-02
申请人： Keyur Patel , Robert Raszuk , Ryan Bickhart , Alton Lo
发明人： Keyur Patel , Robert Raszuk , Ryan Bickhart , Alton Lo
IPC分类号： H04L12/28 , H04L12/751 , H04L12/715
CPC分类号： H04L45/026 , H04L45/04
摘要： In an embodiment, a method comprises: receiving, at a data packet router, a path advertisement comprising information about an available path; determining whether the path advertisement comprises an originator identifier of an originator of the available path; in response to determining that the path advertisement comprises the originator identifier of the originator of the available path, determining whether the originator identifier of the available path is a router identifier of the data packet router, and in response to determining that the originator identifier of the available path is the router identifier of the data packet router, not accepting the path advertisement; wherein the method is performed by one or more processors of the data packet router.
摘要翻译：在一个实施例中，一种方法包括：在数据分组路由器处接收包括关于可用路径的信息的路径通告; 确定路径广告是否包括可用路径的始发者的始发者标识符; 响应于确定路径广告包括可用路径的发起者的始发者标识符，确定可用路径的始发者标识符是否是数据分组路由器的路由器标识符，并且响应于确定所述可用路径的始发者标识符可用路径是数据包路由器的路由器标识符，不接受路径广告; 其中所述方法由所述数据分组路由器的一个或多个处理器执行。

2. 发明申请

US20120281539A1 Detecting and Avoiding Routing Loops with BGP Route Server Extensions 有权
标题翻译：使用BGP路由服务器扩展检测和避免路由环路
公开(公告)号：US20120281539A1
公开(公告)日：2012-11-08
申请号：US13098628
申请日：2011-05-02
申请人： Keyur Patel , Robert Raszuk , Ryan Bickhart , Alton Lo
发明人： Keyur Patel , Robert Raszuk , Ryan Bickhart , Alton Lo
IPC分类号： H04L12/26
CPC分类号： H04L45/026 , H04L45/04
摘要： In an embodiment, a method comprises: receiving, at a data packet router, a path advertisement comprising information about an available path; determining whether the path advertisement comprises an originator identifier of an originator of the available path; in response to determining that the path advertisement comprises the originator identifier of the originator of the available path, determining whether the originator identifier of the available path is a router identifier of the data packet router, and in response to determining that the originator identifier of the available path is the router identifier of the data packet router, not accepting the path advertisement; wherein the method is performed by one or more processors of the data packet router.
摘要翻译：在一个实施例中，一种方法包括：在数据分组路由器处接收包括关于可用路径的信息的路径通告; 确定路径广告是否包括可用路径的始发者的始发者标识符; 响应于确定路径广告包括可用路径的发起者的始发者标识符，确定可用路径的始发者标识符是否是数据分组路由器的路由器标识符，并且响应于确定所述可用路径的始发者标识符可用路径是数据包路由器的路由器标识符，不接受路径广告; 其中所述方法由所述数据分组路由器的一个或多个处理器执行。

3. 发明授权

US08774180B2 Transporting multicast over MPLS backbone using virtual interfaces to perform reverse-path forwarding checks 有权
标题翻译：使用虚拟接口在MPLS骨干网上传输组播，执行反向路径转发检查
公开(公告)号：US08774180B2
公开(公告)日：2014-07-08
申请号：US13339953
申请日：2011-12-29
申请人： Alton Lo , Arjen Boers , Ijsbrand Wijnands
发明人： Alton Lo , Arjen Boers , Ijsbrand Wijnands
IPC分类号： H04L12/56
CPC分类号： H04L12/18 , H04L45/00 , H04L45/04 , H04L45/16 , H04L45/50 , H04L45/60
摘要： A mechanism is provided in which multicast reverse path forwarding can be performed at a provider network egress edge router wherein core routers of the provider network are not configured to support multicast protocols or point-to-multipoint LSPs. An embodiment of the present invention provides for the creation of virtual interfaces in the egress edge router element during configuration of a multicast connection in response to a subscriber request. A virtual interface will be associated with an upstream ingress edge router element and that ingress edge router element is provided a label associated with the virtual interface. Such a label can then be included in datastream packets transmitted through the provider network and be used by reverse path forward checking at the egress edge router element to ascertain whether the multicast datastream is being received by the correct upstream interface.
摘要翻译：提供了一种机制，其中可以在提供商网络出口边缘路由器处执行多播反向路径转发，其中提供商网络的核心路由器未配置为支持多播协议或点对多点LSP。本发明的实施例提供了响应于用户请求在配置多播连接期间在出口边缘路由器元件中创建虚拟接口。虚拟接口将与上游入口边缘路由器元件相关联，并且入口边缘路由器元件被提供与虚拟接口相关联的标签。然后可以将这样的标签包括在通过提供商网络传输的数据流包中，并通过出口边缘路由器元件的反向路径前向检查来使用，以确定正确的上行接口是否正在接收多播数据流。

4. 发明授权

US08934486B2 System and method for implementing multicast over a label-switched core network 有权
标题翻译：通过标签交换核心网实现组播的系统和方法
公开(公告)号：US08934486B2
公开(公告)日：2015-01-13
申请号：US11377064
申请日：2006-03-16
申请人： Ijsbrand Wijnands , Arjen Boers , Alton Lo
发明人： Ijsbrand Wijnands , Arjen Boers , Alton Lo
IPC分类号： H04L12/28 , H04L12/56 , H04J3/26 , H04L12/701 , H04L12/18 , H04L12/46 , H04L12/761 , H04L12/723 , H04L12/931 , H04L12/66
CPC分类号： H04L45/00 , H04L12/18 , H04L12/1836 , H04L12/185 , H04L12/4633 , H04L12/66 , H04L45/16 , H04L45/50 , H04L49/201
摘要： Various devices and methods for implementing multicast over a label-switched core network are disclosed. For example, an edge node can include a physical interface, which is not enabled for multicast, that is configured to be coupled to a core network and a packet rewrite module coupled to the physical interface. The packet rewrite module is configured to encapsulate a multicast packet with a label and to send the encapsulated multicast packet to the physical interface. The label identifies a unicast label switched path (LSP) through the core network. The edge node can also include a virtual interface creation configured to create a virtual interface that is enabled for multicast. The packet rewrite module can encapsulate the multicast packet in response to detecting that the multicast packet is being sent via the virtual interface.
摘要翻译：公开了通过标签交换核心网实现组播的各种设备和方法。例如，边缘节点可以包括被配置为耦合到核心网络的物理接口，其不被启用多播，以及耦合到物理接口的分组重写模块。分组重写模块被配置为封装具有标签的多播分组，并将封装的组播分组发送到物理接口。标签通过核心网标识出单播标签交换路径（LSP）。边缘节点还可以包括虚拟接口创建，其被配置为创建为多播启用的虚拟接口。响应于通过虚拟接口发送组播数据包，数据包重写模块可以封装组播数据包。

5. 发明申请

US20120044801A1 TECHNIQUE FOR DETERMINING WHETHER TO REESTABLISH FAST REROUTED PRIMARY TUNNELS BASED ON BACKUP TUNNEL PATH QUALITY FEEDBACK 有权
标题翻译：用于确定基于备用隧道路径质量反馈的快速解决的主要隧道的技术
公开(公告)号：US20120044801A1
公开(公告)日：2012-02-23
申请号：US13286789
申请日：2011-11-01
申请人： Jean-Philippe Vasseur , Alton Lo , Anna Charny
发明人： Jean-Philippe Vasseur , Alton Lo , Anna Charny
IPC分类号： H04L12/26
CPC分类号： H04L45/28 , H04J3/14 , H04L12/4633 , H04L45/22 , H04L45/50 , H04L45/60
摘要： In one embodiment, a primary tunnel is established from a head-end node to a destination along a path including one or more protected network elements for which a fast reroute path is available to pass traffic around the one or more network elements in the event of their failure. A first path quality measures path quality prior to failure of the one or more protected network elements. A second path quality measures path quality subsequent to failure of the one or more protected network elements, while the fast reroute path is being used to pass traffic of the primary tunnel. A determination is made whether to reestablish the primary tunnel over a new path that does not include the one or more failed protected network elements, or to continue to utilize the path with the fast reroute path, in response to a difference between the first path quality and the second path quality.
摘要翻译：在一个实施例中，沿着包括一个或多个受保护网络的路径的头端节点到目的地建立主隧道，对于该隧道，快速重路由路径可用于在一个或多个网络元件周围传送流量他们的失败第一路径质量在一个或多个受保护的网络元件故障之前测量路径质量。第二路径质量测量在一个或多个受保护网络元件故障之后的路径质量，而快速重路由路径被用于传递主隧道的业务。确定是否通过不包括一个或多个失败的受保护网络元件的新路径重新建立主隧道，或者响应于第一路径质量之间的差异来继续利用具有快速重路由路径的路径和第二条路径质量。

6. 发明授权

US08279749B2 Failure protection for P2MP tunnel head-end node 有权
标题翻译： P2MP隧道前端节点的故障保护
公开(公告)号：US08279749B2
公开(公告)日：2012-10-02
申请号：US11604605
申请日：2006-11-27
申请人： Jean-Philippe Vasseur , Alton Lo , Mohammed Azhar Sayeed
发明人： Jean-Philippe Vasseur , Alton Lo , Mohammed Azhar Sayeed
IPC分类号： G01R31/08
CPC分类号： H04L45/00 , H04L12/4633 , H04L45/16 , H04L45/22 , H04L45/28
摘要： In one embodiment, a primary head-end node (PHE) and one or more backup head-end nodes (BHEs) receive traffic from a common multicast network. The PHE establishes a primary point-to-multipoint (P2MP) tunnel and forwards the multicast traffic onto the primary P2MP tunnel. The PHE then notifies a selected BHE of one or more characteristics of the primary P2MP tunnel, and the selected BHE establishes a backup P2MP tunnel with the characteristics of the primary P2MP tunnel. In response to detecting a failure of the PHE, the BHE initiates forwarding of the multicast traffic onto the backup P2MP tunnel.
摘要翻译：在一个实施例中，主头端节点（PHE）和一个或多个备用前端节点（BHE）从公共多播网络接收业务。 PHE建立主要的点对多点（P2MP）隧道，并将组播流量转发到主P2MP隧道。然后，PHE向所选BHE通知主P2MP隧道的一个或多个特性，并且所选择的BHE建立具有主P2MP隧道特性的备用P2MP隧道。响应检测到PHE故障，BHE发起组播流量转发到备份P2MP隧道。

7. 发明授权

US08089964B2 Transporting multicast over MPLS backbone using virtual interfaces to perform reverse-path forwarding checks 有权
标题翻译：使用虚拟接口在MPLS骨干网上传输组播，执行反向路径转发检查
公开(公告)号：US08089964B2
公开(公告)日：2012-01-03
申请号：US11204446
申请日：2005-08-16
申请人： Alton Lo , Arjen Boers , Ijsbrand Wijnands
发明人： Alton Lo , Arjen Boers , Ijsbrand Wijnands
IPC分类号： H04L12/56
CPC分类号： H04L12/18 , H04L45/00 , H04L45/04 , H04L45/16 , H04L45/50 , H04L45/60
摘要： A mechanism is provided in which multicast reverse path forwarding can be performed at a provider network egress edge router wherein core routers of the provider network are not configured to support multicast protocols or point-to-multipoint LSPs. An embodiment of the present invention provides for the creation of virtual interfaces in the egress edge router element during configuration of a multicast connection in response to a subscriber request. A virtual interface will be associated with an upstream ingress edge router element and that ingress edge router element is provided a label associated with the virtual interface. Such a label can then be included in datastream packets transmitted through the provider network and be used by reverse path forward checking at the egress edge router element to ascertain whether the multicast datastream is being received by the correct upstream interface.
摘要翻译：提供了一种机制，其中可以在提供商网络出口边缘路由器处执行多播反向路径转发，其中提供商网络的核心路由器未配置为支持多播协议或点对多点LSP。本发明的实施例提供了响应于用户请求在配置多播连接期间在出口边缘路由器元件中创建虚拟接口。虚拟接口将与上游入口边缘路由器元件相关联，并且入口边缘路由器元件被提供与虚拟接口相关联的标签。然后可以将这样的标签包括在通过提供商网络传输的数据流包中，并通过出口边缘路由器元件的反向路径前向检查来使用，以确定正确的上行接口是否正在接收多播数据流。

8. 发明授权

US08953604B2 Root node redundancy for multipoint-to-multipoint transport trees 有权
标题翻译：多点到多点传输树的根节点冗余
公开(公告)号：US08953604B2
公开(公告)日：2015-02-10
申请号：US12944901
申请日：2010-11-12
申请人： Ijsbrand Wijnands , Arjen Boers , Alton Lo
发明人： Ijsbrand Wijnands , Arjen Boers , Alton Lo
IPC分类号： H04L12/753 , H04L12/18 , H04L12/751 , H04L12/761 , H04L12/703 , H04L12/801 , H04L12/803
CPC分类号： H04L12/18 , H04L45/02 , H04L45/16 , H04L45/28 , H04L45/48 , H04L47/10 , H04L47/125
摘要： A mechanism is provided to configure a plurality of transport trees in a transport network, each of which correspond to a native tree (e.g., a bidirectional multicast tree). In embodiments of the present invention, each of the plurality of transport trees has a unique root node so that in the event of a failure of any root node, the transport trees with surviving root nodes can be used to transport traffic from the native tree. The present invention provides for each transport network edge router being independently responsible for selection of a transport tree that the edge router will use to transmit a datastream, while also being capable of receiving packets from any transport tree. Through the use of such configured transport trees along with independent selection of a transport tree, the present invention provides a reduction in the disruption of datastream transmission due to a root node failure.
摘要翻译：提供了一种机制来配置传输网络中的多个传输树，每个传输树对应于本地树（例如，双向多播树）。在本发明的实施例中，多个传输树中的每一个具有唯一的根节点，使得在任何根节点发生故障的情况下，具有幸存根节点的传输树可以用于从本地树传输业务。本发明提供每个传输网络边缘路由器独立负责边缘路由器将用于传输数据流的传输树的选择，同时还能够从任何传输树接收分组。通过使用这种配置的传输树以及传输树的独立选择，本发明提供了减少由于根节点故障引起的数据流传输的中断。

9. 发明授权

US08072879B2 Technique for determining whether to reestablish fast rerouted primary tunnels based on backup tunnel path quality feedback 有权
标题翻译：基于备份隧道路径质量反馈确定是否重新建立快速重新路由的主隧道的技术
公开(公告)号：US08072879B2
公开(公告)日：2011-12-06
申请号：US11347781
申请日：2006-02-03
申请人： Jean-Philippe Vasseur , Alton Lo , Anna Charny
发明人： Jean-Philippe Vasseur , Alton Lo , Anna Charny
IPC分类号： H04J1/16
CPC分类号： H04L45/28 , H04J3/14 , H04L12/4633 , H04L45/22 , H04L45/50 , H04L45/60
摘要： A technique dynamically determines whether to reestablish a Fast Rerouted primary tunnel based on path quality feedback of a utilized backup tunnel in a computer network. According to the novel technique, a head-end node establishes a primary tunnel to a destination, and a point of local repair (PLR) node along the primary tunnel establishes a backup tunnel around one or more protected network elements of the primary tunnel, e.g., for Fast Reroute protection. Once one of the protected network elements fail, the PLR node “Fast Reroutes,” i.e., diverts, the traffic received on the primary tunnel onto the backup tunnel, and sends notification of backup tunnel path quality (e.g., with one or more metrics) to the head-end node. The head-end node then analyzes the path quality metrics of the backup tunnel to determine whether to utilize the backup tunnel or reestablish a new primary tunnel.
摘要翻译：一种技术基于计算机网络中利用的备用隧道的路径质量反馈来动态地确定是否重新建立快速重新路由的主隧道。根据新技术，头端节点建立到目的地的主要隧道，沿主隧道的本地修复（PLR）节点建立围绕主隧道的一个或多个受保护网元的备用隧道，例如，用于快速重路由保护。一旦受保护的网络元件发生故障，PLR节点“快速重路由”（即将主隧道上接收到的流量转移到备份隧道上），并发送备份隧道路径质量的通知（例如，使用一个或多个度量）到头端节点。然后，头端节点分析备份隧道的路径质量度量，以确定是否利用备份隧道或重新建立新的主隧道。

10. 发明授权

US07852748B2 Method and system for providing voice QoS during network failure 有权
标题翻译：在网络故障期间提供语音QoS的方法和系统
公开(公告)号：US07852748B2
公开(公告)日：2010-12-14
申请号：US11088389
申请日：2005-03-23
申请人： Francois Le Faucheur , John Evans , Alton Lo
发明人： Francois Le Faucheur , John Evans , Alton Lo
IPC分类号： G01R31/08
CPC分类号： H04L45/50 , H04L45/22 , H04L45/28 , H04L45/3065 , H04L47/10 , H04L47/11 , H04L47/2416 , H04L47/2458 , H04L47/29 , H04L47/30 , H04L47/31 , H04L47/32 , H04L47/728 , H04L47/746 , H04L47/801 , H04L47/805 , H04L47/825 , H04L2012/5631
摘要： A method and system for providing QoS in a network after a network failure are disclosed. The network includes at least one primary tunnel and at least one backup tunnel protecting a segment of the primary tunnel. The method includes receiving notification of a failure within the primary tunnel segment and rerouting received packets onto the backup tunnel. The rerouted packets are marked to identify packets affected by the failure and are subject to a different QoS policy than packets that have not been rerouted due to the failure.
摘要翻译：在网络故障之后，在网络中提供QoS的方法和系统被公开。该网络包括至少一个主隧道和至少一个保护主隧道的段的备份隧道。该方法包括接收主隧道段内的故障通知，并将收到的报文重新路由到备份隧道。重新路由的数据包被标记为识别受故障影响的数据包，并且受到与由于故障而未被重新路由的数据包不同的QoS策略。

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