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61. 发明申请

US20130013810A1 METHOD AND APPARATUS FOR ACCOMMODATING DUPLICATE MAC ADDRESSES 审中-公开
标题翻译：用于存储双重MAC地址的方法和装置
公开(公告)号：US20130013810A1
公开(公告)日：2013-01-10
申请号：US13547326
申请日：2012-07-12
申请人： David Allan , Nigel Bragg
发明人： David Allan , Nigel Bragg
IPC分类号： G06F15/16
CPC分类号： H04L61/2015 , H04L12/2881 , H04L29/12264 , H04L29/12839 , H04L29/12933 , H04L61/2046 , H04L61/6022 , H04L61/6068
摘要： Each access node is associated with one or more IP subnets with a preferred default subnet. Each subnet is instantiated as a unique virtual Ethernet broadcast domain. As client nodes register on the communication network, they will dynamically try to obtain an IP address for use on the communication network. As part of this process, the MAC address of the client node will be checked to ensure that it is not a duplicate of another MAC address associated with another client node that has already been assigned an IP address from the default subnet. When duplicate MAC addresses are detected, the device with the duplicate MAC address will be assigned an IP address from a different subnet so that more than one client device with the same MAC address are not associated with the same subnet.
摘要翻译：每个访问节点与一个或多个具有优选默认子网的IP子网相关联。每个子网被实例化为唯一的虚拟以太网广播域。随着客户端节点在通信网络中的注册，他们将动态地尝试获取在通信网络上使用的IP地址。作为此过程的一部分，将检查客户端节点的MAC地址，以确保它不是与已从默认子网分配了IP地址的另一个客户端节点关联的另一个MAC地址重复。当检测到重复的MAC地址时，具有重复MAC地址的设备将被分配来自不同子网的IP地址，以便具有相同MAC地址的多个客户端设备不与同一个子网相关联。

62. 发明授权

US08331367B2 Break before make forwarding information base (FIB) population for multicast 失效
标题翻译：在转发信息库（FIB）群播前进行多播
公开(公告)号：US08331367B2
公开(公告)日：2012-12-11
申请号：US13048614
申请日：2011-03-15
申请人： Jerome Chiabaut , David Allan , Nigel Bragg
发明人： Jerome Chiabaut , David Allan , Nigel Bragg
IPC分类号： H04L12/28
CPC分类号： H04L41/12 , H04L12/18 , H04L12/462 , H04L45/02 , H04L45/021 , H04L45/16 , H04L45/18 , H04L45/22 , H04L45/28 , H04L45/48
摘要： A method of installing forwarding state in a link state protocol controlled network node having a topology database representing a known topology of the network, and at least two ports for communication with corresponding peers of the network node. A unicast path is computed from the node to a second node in the network, using the topology database, and unicast forwarding state associated with the computed unicast path installed in a filtering database (FDB) of the node. Multicast forwarding state is removed for multicast trees originating at the second node if an unsafe condition is detected. Subsequently, a “safe” indication signal is advertised to each of the peers of the network node. The “safe” indication signal comprises a digest of the topology database. A multicast path is then computed from the network node to at least one destination node of a multicast tree originating at the second node. Finally, multicast forwarding state associated with the computed multicast path is installed in the filtering database (FDB) of the network node, when predetermined safe condition is satisfied.
摘要翻译：一种在具有表示网络的已知拓扑的拓扑数据库的链路状态协议控制的网络节点中安装转发状态的方法，以及用于与网络节点的相应对等体进行通信的至少两个端口。使用拓扑数据库从网络中的节点到第二节点计算单播路径，以及与安装在节点的过滤数据库（FDB）中的计算的单播路径相关联的单播转发状态。如果检测到不安全状况，则组播转发状态将被删除。随后，向网络节点的每个对等体通告安全指示信号。安全指示信号包括拓扑数据库的摘要。然后，从网络节点计算多播路径到源于第二节点的多播树的至少一个目的地节点。最后，当满足预定的安全条件时，安装在网络节点的过滤数据库（FDB）中与计算出的组播路径相关联的组播转发状态。

63. 发明授权

US08059647B2 Multicast implementation in a link state protocol controlled ethernet network 有权
标题翻译：链路状态协议控制的以太网网络中的组播实现
公开(公告)号：US08059647B2
公开(公告)日：2011-11-15
申请号：US11702263
申请日：2007-02-05
申请人： Peter Ashwood-Smith , Guoli Yin , Hong Zhang , Nigel Bragg , David Allan
发明人： Peter Ashwood-Smith , Guoli Yin , Hong Zhang , Nigel Bragg , David Allan
IPC分类号： H04L12/28
CPC分类号： H04L12/462 , H04L12/18 , H04L12/4675 , H04L41/0816 , H04L45/00 , H04L45/12 , H04L45/122 , H04L45/16 , H04L45/18 , H04L45/48
摘要： Forwarding state may be installed for sparse multicast trees in a link state protocol controlled Ethernet network by enabling intermediate nodes to install state for one or more physical multicast trees, each of which may have multiple logical multicast trees mapped to it. By mapping multiple logical multicasts to a particular physical multicast, and installing state for the physical multicast, fewer FIB entries are required to implement the multiple multicasts to reduce the amount of forwarding state in forwarding tables at the intermediate nodes. Mapping may be performed by destination nodes before advertising membership in the physical multicast, or may be performed by the intermediate nodes before installing state when a destination node advertises membership in a logical multicast. Intermediate nodes will install state for the physical multicast tree if they are on a shortest path between a source and at least one destination of one of the logical multicasts that has been mapped to the physical multicast.
摘要翻译：可以通过使中间节点为一个或多个物理多播树安装状态来安装链路状态协议控制的以太网中的稀疏组播树的转发状态，每个物理多播树可以具有映射到它的多个逻辑多播树。通过将多个逻辑组播映射到特定物理组播，并为物理组播安装状态，需要较少的FIB表项来实现多个组播，以减少中间节点转发表中转发状态的数量。映射可以在广播成员身份的物理组播之前由目的地节点执行，或者可以在目的地节点在逻辑多播中通告成员资格之前由中间节点执行安装状态。如果物理组播树处于源映射到物理多播的逻辑多播中的一个源和至少一个目的地之间的最短路径上，则中间节点将为物理多播树安装状态。

64. 发明申请

US20110060844A1 Method and Apparatus for Selecting Between Multiple Equal Cost Paths 失效
标题翻译：在多个等价路径之间选择的方法和装置
公开(公告)号：US20110060844A1
公开(公告)日：2011-03-10
申请号：US12574872
申请日：2009-10-07
申请人： David Allan , Nigel Bragg , Jerome Chiabaut
发明人： David Allan , Nigel Bragg , Jerome Chiabaut
IPC分类号： G06F15/16
CPC分类号： H04L45/24 , H04L12/66 , H04L45/00 , H04L45/12 , H04L45/66
摘要： Each equal cost path is assigned a path ID created by concatenating an ordered set of link IDs which form the path through the network. The link IDs are created from the node IDs on either set of the link. The link IDs are sorted from lowest to highest when creating the path ID to facilitate ranking of the paths. The low and high ranked paths are selected from this ranked list as the first set of diverse paths through the network. Each of the link IDs on each of the paths is then renamed, for example by inverting either all of the high node IDs or low node IDs. After re-naming the links, new path IDs are created by concatenating an ordered set of renamed link IDs. The paths are then re-ranked and the low and high re-ranked paths are selected from this re-ranked list as the second set of diverse paths through the network. Selective naming of node IDs and use of different inversion functions can be exploited to further optimize distribution of traffic on the network.
摘要翻译：为每个相等的成本路径指定了通过连接形成通过网络的路径的有序的链路ID组创建的路径ID。链接ID是从链路的任一组上的节点ID创建的。当创建路径ID以便于路径的排序时，链接ID从最低到最高排序。从这个排名列表中选择低和高排名的路径作为通过网络的第一组不同路径。然后，每个路径上的每个链路ID被重命名，例如通过反转所有高节点ID或低节点ID。在链接重新命名之后，通过连接重命名的链接ID的有序集来创建新的路径ID。然后将路径重新排序，并且从该重新排列的列表中选择低和高重新排序的路径作为通过网络的第二组不同路径。可以利用节点ID的选择性命名和不同的反演功能的使用来进一步优化网络上的流量分配。

65. 发明申请

US20110032936A1 MULTICAST IMPLEMENTATION IN A LINK STATE PROTOCOL CONTROLLED ETHERNET NETWORK 有权
标题翻译：链路状态协议控制以太网网络中的多播实现
公开(公告)号：US20110032936A1
公开(公告)日：2011-02-10
申请号：US12910477
申请日：2010-10-22
申请人： Peter Ashwood-Smith , Guoli Yin , Hong Zhang , Nigel Bragg , David Allan
发明人： Peter Ashwood-Smith , Guoli Yin , Hong Zhang , Nigel Bragg , David Allan
IPC分类号： H04L12/56
CPC分类号： H04L12/462 , H04L12/18 , H04L12/4675 , H04L41/0816 , H04L45/00 , H04L45/12 , H04L45/122 , H04L45/16 , H04L45/18 , H04L45/48
摘要： Forwarding state may be installed for sparse multicast trees in a link state protocol controlled Ethernet network by enabling intermediate nodes to install state for one or more physical multicast trees, each of which may have multiple logical multicast trees mapped to it. By mapping multiple logical multicasts to a particular physical multicast, and installing state for the physical multicast, fewer FIB entries are required to implement the multiple multicasts to reduce the amount of forwarding state in forwarding tables at the intermediate nodes. Mapping may be performed by destination nodes before advertising membership in the physical multicast, or may be performed by the intermediate nodes before installing state when a destination node advertises membership in a logical multicast. Intermediate nodes will install state for the physical multicast tree if they are on a shortest path between a source and at least one destination of one of the logical multicasts that has been mapped to the physical multicast.
摘要翻译：可以通过使中间节点为一个或多个物理多播树安装状态来安装链路状态协议控制的以太网中的稀疏组播树的转发状态，每个物理多播树可以具有映射到它的多个逻辑多播树。通过将多个逻辑组播映射到特定物理组播，并为物理组播安装状态，需要较少的FIB表项来实现多个组播，以减少中间节点转发表中转发状态的数量。映射可以在广播成员身份的物理组播之前由目的地节点执行，或者可以在目的地节点在逻辑多播中通告成员资格之前由中间节点执行安装状态。如果物理组播树处于源映射到物理多播的逻辑多播中的一个源和至少一个目的地之间的最短路径上，则中间节点将为物理多播树安装状态。

66. 发明授权

US07822031B2 Multicast implementation in a link state protocol controlled ethernet network 有权
公开(公告)号：US07822031B2
公开(公告)日：2010-10-26
申请号：US11702263
申请日：2007-02-05
申请人： Peter Ashwood-Smith , Guoli Yin , Hong Zhang , Nigel Bragg , David Allan
发明人： Peter Ashwood-Smith , Guoli Yin , Hong Zhang , Nigel Bragg , David Allan
IPC分类号： H04L12/28
摘要： Forwarding state may be installed for sparse multicast trees in a link state protocol controlled Ethernet network by enabling intermediate nodes to install state for one or more physical multicast trees, each of which may have multiple logical multicast trees mapped to it. By mapping multiple logical multicasts to a particular physical multicast, and installing state for the physical multicast, fewer FIB entries are required to implement the multiple multicasts to reduce the amount of forwarding state in forwarding tables at the intermediate nodes. Mapping may be performed by destination nodes before advertising membership in the physical multicast, or may be performed by the intermediate nodes before installing state when a destination node advertises membership in a logical multicast. Intermediate nodes will install state for the physical multicast tree if they are on a shortest path between a source and at least one destination of one of the logical multicasts that has been mapped to the physical multicast.

67. 发明申请

US20100103846A1 PROVIDER LINK STATE BRIDGING (PLSB) COMPUTATION METHOD 有权
标题翻译： PROVIDER LINK STATE BRIDGING（PLSB）计算方法
公开(公告)号：US20100103846A1
公开(公告)日：2010-04-29
申请号：US12259650
申请日：2008-10-28
申请人： Jerome Chiabaut , David Allan , Nigel Bragg
发明人： Jerome Chiabaut , David Allan , Nigel Bragg
IPC分类号： H04L12/28
CPC分类号： H04L45/122 , H04L45/04 , H04L45/16 , H04L45/48 , H04L45/66
摘要： A method of multicast route computation in a link state protocol controlled network. A spanning tree is computed from a first node to every other node in the network using a known spanning tree protocol. The network is then divided into two or more partitions, each partition encompassing an immediate neighbour node of the first node and any nodes of the network subtending the neighbour node on the spanning tree. Two or more of the partitions are merged when a predetermined criterion is satisfied. Nodes within all of the partitions except a largest one of the partitions are then identified, and each identified node examined to identify node pairs for which a respective shortest path traverses the first node.
摘要翻译：一种链路状态协议控制网络中组播路由计算的方法。使用已知的生成树协议从网络中的第一节点到每个其他节点计算生成树。然后将网络划分成两个或更多个分区，每个分区包含第一节点的直接邻居节点和对生成树上的邻居节点的网络的任何节点。当满足预定标准时，两个或多个分区被合并。然后识别除了最大分区之外的所有分区内的节点，并且检查每个识别的节点以识别相应的最短路径穿过第一节点的节点对。

68. 发明申请

US20100103813A1 PROVISIONED PROVIDER LINK STATE BRIDGING (PLSB) WITH ROUTED BACK-UP 有权
标题翻译：提供备案的提供者链路状态桥（PLSB）
公开(公告)号：US20100103813A1
公开(公告)日：2010-04-29
申请号：US12259560
申请日：2008-10-28
申请人： David Allan , Nigel Bragg , Hadi Nasrallah , Preben Hunnerup
发明人： David Allan , Nigel Bragg , Hadi Nasrallah , Preben Hunnerup
IPC分类号： H04L1/00
CPC分类号： H04L45/00 , H04L41/0663 , H04L45/22 , H04L45/28
摘要： A method of managing traffic flow in a packet network. A working sub-network is provided, which comprises one or more provisioned static working paths between at least one source node and one or more destination nodes in the network, and the working sub-network with a service instance. A backup sub-network is provided, which comprises one or more dynamic protection paths between the at least one source node and the one or more destination nodes, and the backup sub-network associated with the service instance. During a normal operation of the network, forwarding subscriber traffic associated with the service instance through the network using the working sub-network. Following detection of a network failure affecting the service instance, the subscriber traffic associated with the service instance is switched for forwarding through the network using the backup sub-network.
摘要翻译：一种在分组网络中管理业务流的方法。提供了一个工作子网络，其包括在至少一个源节点和网络中的一个或多个目的地节点之间的一个或多个所提供的静态工作路径，以及具有服务实例的工作子网。提供备份子网络，其包括所述至少一个源节点和所述一个或多个目的地节点之间的一个或多个动态保护路径以及与所述服务实例相关联的所述备份子网络。在网络的正常运行期间，通过使用工作子网络的网络转发与服务实例相关联的用户流量。在检测到影响服务实例的网络故障之后，与服务实例相关联的用户流量被切换以通过使用备份子网络的网络进行转发。

69. 发明申请

US20090168768A1 Tie-Breaking in Shortest Path Determination 有权
标题翻译：在最短路径确定中的打破
公开(公告)号：US20090168768A1
公开(公告)日：2009-07-02
申请号：US11964478
申请日：2007-12-26
申请人： Jerome Chiabaut , David Allan , Nigel Bragg , Peter Ashwood-Smith
发明人： Jerome Chiabaut , David Allan , Nigel Bragg , Peter Ashwood-Smith
IPC分类号： H04L12/56
CPC分类号： H04L45/12 , H04L45/00 , H04L45/22 , H04L45/24
摘要： A consistent tie-breaking decision between equal-cost shortest (lowest cost) paths is achieved by comparing an ordered set of node identifiers for each of a plurality of end-to-end paths. Alternatively, the same results can be achieved, on-the-fly, as a shortest path tree is constructed, by making a selection of an equal-cost path using the node identifiers of the diverging branches of the tree. Both variants allow a consistent selection to be made of equal-cost paths, regardless of where in the network the shortest paths are calculated. This ensures that traffic flow between any two nodes, in both the forward and reverse directions, will always follow the same path through the network.
摘要翻译：通过比较多个端到端路径中的每一个的有序节点标识符集来实现等成本最短（最低成本）路径之间的一致的打破决定。或者，通过使用树的分支分支的节点标识符选择等价路径，可以实时地实现与最短路径树相同的结果。这两种变体允许对等成本路径进行一致的选择，而不管网络中哪些地方计算最短路径。这确保任何两个节点之间在正向和反向方向上的业务流量将始终遵循通过网络的相同路径。

70. 发明申请

US20080310417A1 DIFFERENTIAL FORWARDING IN ADDRESS-BASED CARRIER NETWORKS 有权
标题翻译：基于地址的运营商网络的差异转发
公开(公告)号：US20080310417A1
公开(公告)日：2008-12-18
申请号：US12196909
申请日：2008-08-22
申请人： Robert Friskney , Nigel Bragg , Simon Parry , Peter Ashwood Smith , David Allan , Simon Brueckheimer
发明人： Robert Friskney , Nigel Bragg , Simon Parry , Peter Ashwood Smith , David Allan , Simon Brueckheimer
IPC分类号： H04L12/56
CPC分类号： H04L41/0823 , H04L12/4645 , H04L45/00 , H04L45/16 , H04L45/54 , H04L45/64 , H04L45/66 , H04L45/72 , H04L49/205 , H04L49/253 , H04L49/254 , H04L49/351 , H04L49/354
摘要： The invention relates to enabling differential forwarding in address-based carrier networks such as Ethernet networks. There is described a method of and connection controller for establishing connections (76, 77) in a frame-based communications network comprising nodes (71-75 and 78) such as Ethernet switches. The connections are established by configuring, in various of the nodes, mappings for forwarding data frames, such as Ethernet frames. The mappings are from a combination of a) a destination (or source) address corresponding to a destination (or source) node (73) of the connection and b) an identifier, such as a VLAN tag. The mappings are to selected output ports of the various nodes. By using the combination of destination (or source) address AND identifier, the mappings enable data frames belonging to different connections (76, 77) to be forwarded differentially (ie forwarded on different output ports) at a node (75) despite the different connections having the same destination node. This enables flexibility in routing connections and the ability to perform traffic engineering.
摘要翻译：本发明涉及在诸如以太网的基于地址的运营商网络中启用差分转发。描述了在包括诸如以太网交换机的节点（71-75和78）的基于帧的通信网络中建立连接（76,77）的方法和连接控制器。通过在各种节点中配置用于转发数据帧（例如以太网帧）的映射来建立连接。映射来自a）与该连接的目的地（或源）节点（73）对应的目的地（或源）地址的组合，以及b）诸如VLAN标签的标识符。映射到各个节点的选定输出端口。通过使用目的地（或源）地址AND标识符的组合，映射使得属于不同连接（76,77）的数据帧能够在节点（75）处差分地转发（即，在不同的输出端口上转发），尽管不同的连接具有相同的目的地节点。这使得路由连接的灵活性和执行流量工程的能力。

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