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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 。
    • 5. 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
    • Inter-domain optimization trigger in PCE-based environment
    • 基于PCE的环境中的域间优化触发
    • US07684351B2
    • 2010-03-23
    • US11052280
    • 2005-02-07
    • Jean-Philippe VasseurDavid D. WardMuthurajah SivabalanStefano B. Previdi
    • Jean-Philippe VasseurDavid D. WardMuthurajah SivabalanStefano B. Previdi
    • H04L12/28
    • H04L45/42H04L45/02H04L45/04H04L45/32H04L45/50
    • A technique triggers optimization of a traffic engineering (TE) label switched path (LSP) that spans multiple domains of a computer network from a head-end node of a local domain to a tail-end node of a remote domain. The technique is based on the detection of an event in the remote domain (“event domain”) that could create a more optimal TE-LSP, such as, e.g., restoration of a network element or increased available bandwidth. Specifically, a path computation element (PCE) in the event domain learns of the event and notifies other PCEs of the event through an event notification. These PCEs then flood an event notification to label switched routers (LSRs) in their respective domain. Upon receiving the notification, if an LSR has one or more TE-LSPs (or pending TE-LSPs), it responds to the PCE with an optimization request for the TE-LSPs. The PCE determines whether a particular TE-LSP may benefit from optimization based on the event domain (i.e., whether the TE-LSP uses the event domain), and processes the request accordingly.
    • 一种技术触发跨越计算机网络的多个域从本地域的头端节点到远程域的尾端节点的流量工程(TE)标签交换路径(LSP)的优化。 该技术基于对远程域(“事件域”)中的事件的检测,其可以创建更优化的TE-LSP,例如网络元件的恢复或增加的可用带宽。 具体地,事件域中的路径计算元素(PCE)学习事件并通过事件通知通知其他PCE事件。 然后,这些PCE将事件通知泛滥到其各自域中的标签交换路由器(LSR)。 在收到通知后,如果LSR有一个或多个TE-LSP(或待处理的TE-LSP),则对该TEE的优先请求响应PCE。 PCE确定特定TE-LSP是否可以从基于事件域的优化(即,TE-LSP是否使用事件域)获益,并且相应地处理该请求。