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    Fast remote failure notification
    2.
    发明申请
    Fast remote failure notification 有权
    快速远程故障通知

    公开(公告)号：US20090010153A1

    公开(公告)日：2009-01-08

    申请号：US11824885

    申请日：2007-07-03

    申请人： Clarence Filsfils ,  Stefano Previdi ,  David Ward

    发明人： Clarence Filsfils ,  Stefano Previdi ,  David Ward

    IPC分类号： H04L12/24

    CPC分类号： H04L45/22 ,  H04L45/02 ,  H04L45/28 ,  H04L67/14 ,  H04L69/40

    摘要： A method and system for failure notification at a remote node in communication with a local node are disclosed. The local node is configured for faster failure detection than the remote node. In one embodiment, the method includes establishing a failure monitoring session between the local node and the remote node, receiving at the remote node, a failure notification from the local node, the failure notification sent using a protocol of the failure monitoring session, and rerouting traffic at the remote node in response to the failure notification.

    摘要翻译： 公开了一种在与本地节点通信的远程节点处的故障通知的方法和系统。 本地节点配置为比远程节点更快的故障检测。 在一个实施例中，该方法包括在本地节点和远程节点之间建立故障监视会话，在远程节点接收来自本地节点的故障通知，使用故障监视会话的协议发送的故障通知和重新路由 响应故障通知在远程节点的流量。

    Loop prevention techniques using encapsulation manipulation of IP/MPLS field
    6.
    发明申请
    Loop prevention techniques using encapsulation manipulation of IP/MPLS field 有权
    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。

    System and method for dynamically responding to event-based traffic redirection
    8.
    发明申请
    System and method for dynamically responding to event-based traffic redirection 有权
    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：US20060291391A1

    公开(公告)日：2006-12-28

    申请号：US11168694

    申请日：2005-06-27

    申请人： Jean-Philippe Vasseur ,  David Ward ,  Stefano Previdi ,  Clarence Filsfils

    发明人： Jean-Philippe Vasseur ,  David Ward ,  Stefano Previdi ,  Clarence Filsfils

    IPC分类号： H04J1/16 ,  H04L12/28 ,  H04L12/56

    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 。

    Loop prevention technique for MPLS using service labels
    9.
    发明申请
    Loop prevention technique for MPLS using service labels 有权
    使用服务标签的MPLS环路防护技术

    公开(公告)号：US20060193248A1

    公开(公告)日：2006-08-31

    申请号：US11068081

    申请日：2005-02-28

    申请人： Clarence Filsfils ,  David Ward ,  Stefano Previdi ,  Jean-Philippe Vasseur ,  Jim Guichard ,  Robert Raszuk

    发明人： Clarence Filsfils ,  David Ward ,  Stefano Previdi ,  Jean-Philippe Vasseur ,  Jim Guichard ,  Robert Raszuk

    IPC分类号： H04J3/14 ,  H04L12/56 ,  H04J1/16 ,  H04L12/28

    CPC分类号： H04L45/18 ,  H04L45/04 ,  H04L45/22 ,  H04L45/28 ,  H04L45/50

    摘要： A local 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. The backup edge device identifies protected data packets as those which contain a predetermined “service” label in their MPLS label stacks. In other words, the service label is used as an identifier for packets that have been FRR rerouted. Upon receiving a data packet containing a service label, the backup edge device is not permitted to reroute the packet a second time, e.g., in response to another inter-domain node or link failure, thereby preventing loops from developing at the edge of the network.

    摘要翻译： 本地快速重路由（FRR）技术在计算机网络的边缘实现。 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。 备份边缘设备将受保护的数据包标识为在其MPLS标签堆栈中包含预定“服务”标签的数据包。 换句话说，服务标签被用作已被FRR重新路由的数据包的标识符。 在接收到包含服务标签的数据分组时，不允许备份边缘设备第二次重新路由该分组，例如响应于另一个域间节点或链路故障，从而防止在网络边缘发展的环路 。