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    • 82. 发明申请
    • Method for recovery of a controlled failover of a border gateway protocol speaker
    • 恢复边界网关协议扬声器受控故障转移的方法
    • US20070086461A1
    • 2007-04-19
    • US11253119
    • 2005-10-17
    • David WardJohn Scudder
    • David WardJohn Scudder
    • H04L12/56
    • H04L45/28H04L45/04H04L45/58H04L45/60H04L69/16H04L69/163H04L69/40
    • A method and apparatus for recovering from a controlled failover of a BGP speaker is provided. A user sends, to a network element, a request to switch a designation of an active Border Gateway Protocol (BGP) speaker of the network element from a first BGP speaker to a second BGP speaker. After receiving the request, the network element pauses operation of a transport for BGP. Routing data, which describes a state of a first routing information base (RIB) maintained by the active BGP speaker, is transferred from the first BGP speaker to the second BGP speaker. Thereafter, the first BGP speaker may instruct the second BGP speaker to become the active BGP speaker. After the second BGP speaker becomes the active BGP speaker, the second BGP speaker resumes operation of the BGP transport.
    • 提供了一种用于从BGP扬声器的受控故障转移中恢复的方法和装置。 用户向网络单元发送将网元的主动边界网关协议(BGP)扬声器的指定从第一BGP扬声器切换到第二BGP扬声器的请求。 接收到请求后,网元暂停运行BGP。 描述由主动BGP扬声器维护的第一路由信息库(RIB)的状态的路由数据从第一BGP发言者传送到第二BGP发言者。 此后,第一个BGP扬声器可以指示第二个BGP扬声器成为主动的BGP扬声器。 第二个BGP扬声器成为主动BGP扬声器后,第二个BGP扬声器恢复BGP传输的运行。
    • 84. 发明申请
    • System and method for dynamically responding to event-based traffic redirection
    • 用于动态响应基于事件的流量重定向的系统和方法
    • US20060291391A1
    • 2006-12-28
    • US11168694
    • 2005-06-27
    • Jean-Philippe VasseurDavid WardStefano PrevidiClarence Filsfils
    • Jean-Philippe VasseurDavid WardStefano PrevidiClarence Filsfils
    • H04J1/16H04L12/28H04L12/56
    • H04L45/22H04L45/02H04L45/28H04L47/70H04L47/746H04L47/762H04L47/825H04L47/829
    • 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.
    • 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 。
    • 86. 发明申请
    • Loop prevention technique for MPLS using service labels
    • 使用服务标签的MPLS环路防护技术
    • US20060193248A1
    • 2006-08-31
    • US11068081
    • 2005-02-28
    • Clarence FilsfilsDavid WardStefano PrevidiJean-Philippe VasseurJim GuichardRobert Raszuk
    • Clarence FilsfilsDavid WardStefano PrevidiJean-Philippe VasseurJim GuichardRobert Raszuk
    • H04J3/14H04L12/56H04J1/16H04L12/28
    • H04L45/18H04L45/04H04L45/22H04L45/28H04L45/50
    • 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.
    • 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 。