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    Methods and systems to store state used to forward multicast traffic
    12.
    发明授权
    Methods and systems to store state used to forward multicast traffic 有权
    存储用于转发组播流量的状态的方法和系统

    公开(公告)号：US08295203B2

    公开(公告)日：2012-10-23

    申请号：US12060709

    申请日：2008-04-01

    申请人： Kadangode K. Ramakrishnan ,  Divesh Srivastava ,  Tae W. Cho ,  Yin Zhang ,  Michael Rabinovich

    发明人： Kadangode K. Ramakrishnan ,  Divesh Srivastava ,  Tae W. Cho ,  Yin Zhang ,  Michael Rabinovich

    IPC分类号： H04L12/28

    CPC分类号： H04L12/1886 ,  H04L45/16 ,  H04L45/48

    摘要： Methods and systems are described to store state used to forward multicast traffic. The system includes a receiving module to receive request to add a first node to a membership tree. The membership tree includes a first plurality of nodes associated with a multicast group. The system further includes a processing module to identify a second node in the first plurality of nodes and to communicate a node identifier that identifies the first node over a network to the second node. The node identifier is to be stored at the second node to add the first node to the membership tree. The node identifier is further to be stored in the membership tree exclusively at the second node to enable the second node to forward the multicast traffic to the first node.

    摘要翻译： 描述了用于存储用于转发组播流量的状态的方法和系统。 该系统包括接收模块，用于接收向成员树添加第一个节点的请求。 隶属树包括与多播组相关联的第一多个节点。 所述系统还包括处理模块，用于识别所述第一多个节点中的第二节点，并将通过网络识别所述第一节点的节点标识符传送到所述第二节点。 节点标识符将存储在第二个节点，以将第一个节点添加到成员树中。 节点标识符进一步被存储在专属于第二节点的成员树中，以使得第二节点能够将多播业务转发到第一节点。

    Cross-layer reconfiguration method for surviving multiple-link network failures
    15.
    发明授权
    Cross-layer reconfiguration method for surviving multiple-link network failures 有权
    用于存在多链路网络故障的跨层重新配置方法

    公开(公告)号：US08243586B2

    公开(公告)日：2012-08-14

    申请号：US12592371

    申请日：2009-11-24

    申请人： Kadangode K. Ramakrishnan ,  Rakesh Kumar Sinha ,  Ajay Kumar Todimala

    发明人： Kadangode K. Ramakrishnan ,  Rakesh Kumar Sinha ,  Ajay Kumar Todimala

    IPC分类号： G01R31/08

    CPC分类号： H04L41/0816 ,  H04L41/06

    摘要： A second link in a network is reconfigured after failure of a first link, so that multiple-link failures may be survived. After receipt of an OSPF link state advertisement (LSA) indicating use of a backup path bl after the failure of link l, new backup paths are determined for each impacted link (x,y) that has a backup path sharing one or more links with the backup path bl. The new backup paths are computed while ignoring the failed link l, the impacted link (x,y), and links common to the backup paths b(x,y) and bl. The LSA protocol is modified to accommodate information used in determining whether a link is an impacted link.

    摘要翻译： 网络中的第二个链路在第一个链路发生故障后被重新配置，从而多链路故障可能会被存活。 在收到指示在链路l故障之后使用备份路径b1的OSPF链路状态通告（LSA）之后，为每个受影响的链路（x，y）确定新的备份路径，该备份路径具有共享一个或多个链路的备份路径 备份路径bl。 计算新的备份路径，同时忽略故障链路l，受影响的链路（x，y）和备份路径b（x，y）和bl共同的链路。 修改LSA协议以适应用于确定链路是否是受影响链路的信息。

    Method and apparatus for increasing survivability in IP networks
    20.
    发明授权
    Method and apparatus for increasing survivability in IP networks 失效
    提高IP网络生存能力的方法和装置

    公开(公告)号：US07680055B1

    公开(公告)日：2010-03-16

    申请号：US10805643

    申请日：2004-03-19

    申请人： Kadangode K. Ramakrishnan ,  Mukul Goyal

    发明人： Kadangode K. Ramakrishnan ,  Mukul Goyal

    IPC分类号： H04J1/16

    CPC分类号： H04L41/0896 ,  H04L41/12

    摘要： A method and apparatus for increasing the capability of a network topology model having a plurality of nodes connected by existing links to maintain service continuity in the presence of faults. The steps of the method include adding new links to the network topology model to protect against single node failures, and adjusting link weights for the network topology model to reduce at least one of a cost of network operation and an imbalance in link utilizations. Preferably, the link weights are adjusted to reduce the imbalance in link utilizations without deteriorating the cost of network operation. The link weights are preferably adjusted to reduce the cost of network operation without increasing the imbalance in link utilizations. Preferably, the link weights are adjusted to reduce the cost of network operation without increasing the imbalance in link utilizations while keeping the utilization for each link below a specific threshold. In addition, links can be added to the network topology model to reduce the cost of network operation.

    摘要翻译： 一种用于增加具有由现有链路连接的多个节点的网络拓扑模型的能力的方法和装置，以在存在故障的情况下维持业务连续性。 该方法的步骤包括向网络拓扑模型添加新的链路以防止单个节点故障，以及调整网络拓扑模型的链路权重以减少网络操作的成本和链路利用率的不平衡中的至少一个。 优选地，链路权重被调整以减少链路利用率的不平衡，而不会降低网络操作的成本。 优选地调整链路权重以减少网络操作的成本，而不增加链路利用率的不平衡。 优选地，调整链路权重以降低网络操作的成本，而不增加链路利用率的不平衡，同时保持每个链路的利用率低于特定阈值。 另外，链路可以添加到网络拓扑模型中，以降低网络运行的成本。