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    • 2. 发明授权
    • Method and apparatus to compute local repair paths taking into account link resources and attributes
    • 考虑链路资源和属性来计算局部修复路径的方法和装置
    • US08068411B2
    • 2011-11-29
    • US11025179
    • 2004-12-29
    • Jean-Philippe VasseurStefano B. PrevidiDavid D. Ward
    • Jean-Philippe VasseurStefano B. PrevidiDavid D. Ward
    • H04J1/16H04L1/00
    • H04L45/28H04J3/14H04L45/02
    • A technique for calculating local repair paths through a computer network using one or more dynamically measured parameters in place of, or in addition to, statically assigned cost metrics. The dynamically measured parameters include various statistical measures of resources and attributes associated with data links and/or network nodes in the computer network. In operation, an intermediate node monitors a set of local link and/or node parameters. The node may generate an advertisement in response to at least one of its monitored parameters crossing a predetermined threshold value or changing value by a predetermined percentage or amount. The advertisement is “flooded” so as to advertise the dynamically measured parameter value to other neighboring intermediate nodes. After receiving the advertisement, each node may recalculate one or more local repair paths based on the advertised parameter value. The node may utilize a recalculated repair path if it provides an appreciably lower-cost path, e.g., by a predetermined percentage, as compared with the currently deployed repair path.
    • 一种用于通过使用一个或多个动态测量参数来代替静态分配的成本度量来计算通过计算机网络的局部修复路径的技术。 动态测量的参数包括与计算机网络中的数据链路和/或网络节点相关联的资源和属性的各种统计测量。 在运行中,中间节点监视一组本地链路和/或节点参数。 该节点可以响应于其所监视的参数中的至少一个与预定阈值相交或者以预定百分比或数量改变值来生成广告。 广告被“淹没”,以便将动态测量的参数值通告给其他相邻的中间节点。 在接收到广告之后,每个节点可以基于所通告的参数值重新计算一个或多个本地修复路径。 如果节点可以使用重新计算的修复路径,如果其与当前部署的修复路径相比提供了明显较低成本的路径,例如,以预定百分比。
    • 4. 发明授权
    • Loop prevention technique for MPLS using service labels
    • 使用服务标签的MPLS环路防护技术
    • US07664013B2
    • 2010-02-16
    • US11068081
    • 2005-02-28
    • Clarence FilsfilsDavid D. WardStefano B. PrevidiJean-Philippe VasseurJim GuichardRobert Raszuk
    • Clarence FilsfilsDavid D. WardStefano B. PrevidiJean-Philippe VasseurJim GuichardRobert Raszuk
    • H04L12/26
    • 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 。
    • 6. 发明授权
    • Inter-domain TE-LSP with IGP extensions
    • 具有IGP扩展的域间TE-LSP
    • US07460481B2
    • 2008-12-02
    • US11001459
    • 2004-12-01
    • Jean-Philippe VasseurStefano B. Previdi
    • Jean-Philippe VasseurStefano B. Previdi
    • H04L12/26
    • H04L47/825H04L45/02H04L45/04H04L45/28H04L45/502H04L47/70H04L47/724H04L47/785
    • A technique propagates reachability information for a tail-end node of a traffic engineering (TE) label switched path (LSP) to a head-end node of the TE-LSP in a computer network. The TE-LSP preferably spans multiple domains of the network such that the tail-end node resides in a domain that is different (remote) from the domain of the head-end node. The inter-domain information propagation technique employs an Interior Gateway Protocol (IGP) to transmit the remote reachability information from a target node residing in the same domain as the tail-end node to the head-end node. The head-end node uses the remote information to calculate routes, i.e., address prefixes and associated attributes, reachable from the tail-end node for insertion into its routing table.
    • 一种技术将流量工程(TE)标签交换路径(LSP)的尾端节点的可达性信息传播到计算机网络中的TE-LSP的前端节点。 TE-LSP优选地跨越网络的多个域,使得尾端节点驻留在与头端节点的域不同(远程)的域中。 域间信息传播技术采用内部网关协议(IGP)来将远程可达性信息从驻留在与尾端节点相同的域中的目标节点传送到头端节点。 前端节点使用远程信息来计算从尾端节点可到达其路由表的路由,即地址前缀和相关联的属性。
    • 7. 发明授权
    • Graceful shutdown of network resources in data networks
    • 数据网络中网络资源的正常关闭
    • US07457248B1
    • 2008-11-25
    • US10775855
    • 2004-02-10
    • Zafar AliAnca ZamfirDavid D. WardStefano B. PrevidiJean-Philippe VasseurPeter Psenak
    • Zafar AliAnca ZamfirDavid D. WardStefano B. PrevidiJean-Philippe VasseurPeter Psenak
    • G01R31/08
    • H04L43/0811H04L41/0681H04W48/08
    • A technique gracefully shuts down network resources, such as nodes, interfaces and protocols, in a data network in a manner that minimizes network disruption. The technique may be used with both connectionless and connection-oriented networking systems. A node gracefully shuts down a network resource associated with the node by i) notifying other nodes in the network that the resource is being gracefully shutdown, ii) waiting for a condition to occur, and iii) when the condition occurs, shutting down the resource. The condition may include the expiration of a predetermined amount of time and/or monitoring the resource to determine if the resource has reached a certain level of activity. In response to receiving a notification that a resource is being gracefully shutdown, a node takes action to reroute traffic around the resource. If no alternative route is available, the node may continue to route traffic to the resource until it is shut down.
    • 一种技术以最小化网络中断的方式,在数据网络中正常地关闭网络资源,如节点,接口和协议。 该技术可以与无连接和面向连接的网络系统一起使用。 一个节点通过i)通知网络中的其他节点资源被正常地关闭,从而正常地关闭与该节点相关联的网络资源,ii)等待状况发生,以及iii)当该情况发生时,关闭该资源 。 条件可以包括预定时间量的到期和/或监视资源以确定资源是否已经达到一定的活动水平。 响应收到资源正常关闭的通知,节点将采取行动重新路由资源周围的流量。 如果没有替代路由可用,节点可以继续将流量路由到资源,直到其被关闭。
    • 8. 发明授权
    • Automatic prioritization of BGP next-hop in IGP
    • 在IGP中自动优先化BGP下一跳
    • US07436838B2
    • 2008-10-14
    • US11025251
    • 2004-12-29
    • Clarence FilsfilsStefano B. PrevidiJean-Philippe Vasseur
    • Clarence FilsfilsStefano B. PrevidiJean-Philippe Vasseur
    • H04L1/00H04L12/26
    • H04L45/02H04L45/04H04L45/14
    • A technique configures an intermediate network node to automatically determine whether a route advertised by a routing protocol is important for fast convergence in a computer network. As used herein, an important route needed for fast convergence is a route advertised by the routing protocol, such as an exterior gateway routing protocol, as a next-hop address, since external connectivity relies on such a route. A routing information base process executing on the node stores the advertised route and, notably, interacts with an interior gateway routing protocol (IGP) process executing on the node to identify the route as an important route. Identification of an important route, in turn, allows IGP to process the route in a high priority fashion, thereby facilitating fast convergence.
    • 一种技术配置中间网络节点,以自动确定路由协议发布的路由是否对计算机网络中的快速收敛很重要。 如本文所使用的,快速收敛所需的重要路线是路由协议(例如外部网关路由协议)作为下一跳地址通告的路由,因为外部连接依赖于这样的路由。 在节点上执行的路由信息​​库过程存储所通告的路由,并且特别地与在节点上执行的内部网关路由协议(IGP)进程进行交互,以将该路由识别为重要路由。 识别重要的路由又反过来允许IGP以高优先级的方式处理路由,从而促进快速收敛。