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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

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。

63. 发明申请

US20110103263A1 Implementation of VPNs over a Link State Protocol Controlled Ethernet Network 有权
标题翻译：通过链路状态协议控制的以太网实现VPN
公开(公告)号：US20110103263A1
公开(公告)日：2011-05-05
申请号：US13004979
申请日：2011-01-12
申请人： Paul Unbehagen , David Allan , Brunn Germain , Roger Lapuh , Monish Anumala , Nigel Bragg
发明人： Paul Unbehagen , David Allan , Brunn Germain , Roger Lapuh , Monish Anumala , Nigel Bragg
IPC分类号： H04L12/56 , H04L12/28
CPC分类号： H04L12/4662 , H04L12/462 , H04L12/4645 , H04L12/4683 , H04L45/02 , H04L45/028 , H04L45/04 , H04L45/502 , H04L45/52 , H04L45/54 , H04L45/66
摘要： Nodes on a link state protocol controlled Ethernet network implement a link state routing protocol such as IS-IS. Nodes assign an IP address or I-SID value per VRF and then advertise the IP addresses or I-SID values in IS-IS LSAs. When a packet is to be forwarded on the VPN, the ingress node identifies the VRF for the packet and performs an IP lookup in customer address space in the VRF to determine the next hop and the IP address or I-SID value of the VRF on the egress node. The ingress node prepends an I-SID or IP header to identify the VRFs and then creates a MAC header to allow the packet to be forwarded to the egress node on the link state protocol controlled Ethernet network. When the packet is received at the egress node, the MAC header is stripped from the packet and the appended I-SID or IP header is used to identify the egress VRF. A customer address space IP lookup is then performed in the identified VRF on the egress node using the information in the client IP header to determine how to forward the packet. Customer reachability information within a VPN may be exchanged between VRFs using iBGP, or directly by using link state protocol LSAs tagged with the relevant I-SID.
摘要翻译：链路状态协议控制的以太网上的节点实现了IS-IS等链路状态路由协议。节点为每个VRF分配IP地址或I-SID值，然后在IS-IS LSA中通告IP地址或I-SID值。当在VPN上转发数据包时，入节点识别数据包的VRF，并在VRF的客户地址空间中执行IP查找，以确定下一跳以及VRF的IP地址或I-SID值出口节点。入口节点前置I-SID或IP头以识别VRF，然后创建一个MAC报头，以允许将数据包转发到链路状态协议控制的以太网上的出口节点。当在出口节点处接收到分组时，从分组中剥离MAC报头，并使用附加的I-SID或IP报头来识别出口VRF。然后使用客户端IP报头中的信息在出口节点上识别的VRF中执行客户地址空间IP查找，以确定如何转发数据包。 VPN内的客户可达性信息可以使用iBGP在VRF之间交换，也可以直接使用与相关I-SID标记的链路状态协议LSA交换。

64. 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。

65. 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.

66. 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。

67. 发明申请

US20090279536A1 IP forwarding across a link state protocol controlled ethernet network 有权
标题翻译：通过链路状态协议控制的以太网网络进行IP转发
公开(公告)号：US20090279536A1
公开(公告)日：2009-11-12
申请号：US12151684
申请日：2008-05-08
申请人： Paul Unbehagen , David Allan , Nigel Bragg
发明人： Paul Unbehagen , David Allan , Nigel Bragg
IPC分类号： H04L12/66 , H04L12/56
CPC分类号： H04L12/4625 , H04L12/462 , H04L29/12028 , H04L45/00 , H04L45/02 , H04L45/42 , H04L45/66 , H04L45/742 , H04L61/103
摘要： Nodes on an Ethernet network run a link state protocol on the control plane and install shortest path forwarding state into their FIBs to allow packets to follow shortest paths through the network without requiring MAC header replacement at each hop through the network. When a node learns an IP address, it will insert the IP address into its link state advertisement to advertise reachability of the IP address to the other nodes on the network. Each node will add this IP address to its link state database. If a packet arrives at an ingress node, the ingress node will read the IP address, determine which node on the link state protocol controlled Ethernet network is aware of the IP address, and construct a MAC header to forward the packet to the correct node. The DA/VID of the MAC header is the nodal MAC of the node that advertised the IP address. Unicast and multicast IP forwarding may be implemented.
摘要翻译：以太网上的节点在控制平面上运行链路状态协议，并将最短路径转发状态安装到其FIB中，以允许数据包遵循通过网络的最短路径，而不需要通过网络在每一跳进行MAC报头替换。当节点学习IP地址时，会将IP地址插入到链路状态通告中，以将IP地址的可达性通告给网络上的其他节点。每个节点将该IP地址添加到其链路状态数据库。如果分组到达入口节点，入口节点将读取IP地址，确定链路状态协议控制的以太网网络上的哪个节点知道IP地址，并构建一个MAC报头，将数据包转发到正确的节点。 MAC头的DA / VID是通告IP地址的节点的节点MAC。可以实现单播和组播IP转发。

68. 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。

69. 发明申请

US20080144644A1 Method and apparatus for exchanging routing information and the establishment of connectivity across multiple network areas 失效
标题翻译：用于交换路由信息和跨多个网络区域建立连接的方法和装置
公开(公告)号：US20080144644A1
公开(公告)日：2008-06-19
申请号：US11899118
申请日：2007-09-04
申请人： David Allan , Nigel Bragg , Paul Unbehagen , Peter Ashwood-Smith , Guoli Yin
发明人： David Allan , Nigel Bragg , Paul Unbehagen , Peter Ashwood-Smith , Guoli Yin
IPC分类号： H04L12/28
CPC分类号： H04L41/12 , H04L12/462 , H04L45/02 , H04L45/04 , H04L45/66
摘要： Routes may be installed across multiple link state protocol controlled Ethernet network areas by causing ABBs to leak I-SID information advertised by BEBs a L1 network area into an L2 network area. ABBs will only leak I-SIDs for BEBs where it is the closest ABB for that BEB. Where another ABB on the L2 network also leaks the same I-SID into the L2 network area from another L1 network area, the I-SID is of multi-area interest. ABBs will advertise I-SIDs that are common to the L1 and L2 networks back into their respective L1 network. Within each L1 and L2 network area, forwarding state will be installed between network elements advertising common interest in an ISID, so that multi-area paths may be created to span the L1/L2/L1 network areas. ABBs may summarize BEB multicast trees such that the set of trees for a given I-SID transiting the ABB is condensed into a common tree. The L2 network may further be implemented as a second layer implemented using a L1/L2/L1 network structure, so that the L1/L2/L1 network structure may recurse an arbitrary number of times.
摘要翻译：可以通过使ABB将由L1B网络区域发布的I-SID信息泄漏到L2网络区域中，将多个链路状态协议控制的以太网网络上的路由安装到L2网络区域。 ABB只会泄漏BEB的I-SID，而该BEB是该BEB最接近的ABB。在L2网络上的另一个ABB也从另一个L1网络区域将相同的I-SID泄漏到L2网络区域中，I-SID具有多方面的兴趣。 ABB将通过将L1和L2网络通用的I-SID广播回各自的L1网络。在每个L1和L2网络区域内，转发状态将被安装在对ISID广播共同兴趣的网元之间，从而可以创建多区域路径来跨越L1 / L2 / L1网络区域。 ABB可能会总结BEB组播树，以便将通过ABB的给定I-SID的树组合成一个公共树。 L2网络还可以被实现为使用L1 / L2 / L1网络结构实现的第二层，使得L1 / L2 / L1网络结构可以递归任意次数。

70. 发明申请

US20070177527A1 Planning routes and allocating identifiers to routes in a managed frame-forwarding network 失效
标题翻译：规划路由并为托管的帧转发网络中的路由分配标识符
公开(公告)号：US20070177527A1
公开(公告)日：2007-08-02
申请号：US11343996
申请日：2006-01-31
申请人： Nigel Bragg , Paul Bottorff , David Allan , Robert Friskney , Simon Parry
发明人： Nigel Bragg , Paul Bottorff , David Allan , Robert Friskney , Simon Parry
IPC分类号： H04L12/28
CPC分类号： H04L45/48 , H04L45/04
摘要： A method is provided of planning routes and allocating route identifiers in a managed frame-forwarding network. The network comprises a plurality of nodes interconnected by links, with each node being arranged to forward data frames according to a combination of an identifier and a network address carried by a received data frame and forwarding instructions stored at the node. A first step of the method identifies a sub-set of nodes which are core nodes of the network. The remaining nodes are termed outlying nodes. A spanning tree is then built off each of the identified core nodes, with the spanning tree stopping one link short of any other core node. Each spanning tree defines a loop-free path between a core node at the root of the spanning tree and a set of outlying nodes. Connections are planned between roots of the spanning trees and a different identifier is allocated to each planned connection between a pair of spanning trees.
摘要翻译：提供了一种在被管理的帧转发网络中规划路由和分配路由标识符的方法。该网络包括通过链路互连的多个节点，每个节点被安排为根据由接收的数据帧承载的标识符和网络地址的组合以及存储在该节点处的转发指令来转发数据帧。该方法的第一步确定作为网络核心节点的节点子集。其余节点称为外围节点。然后，每个标识的核心节点都生成一个生成树，生成树停止一个链路，而不是任何其他核心节点。每个生成树定义生成树根节点和一组外围节点之间的无环路径。在生成树的根之间计划连接，并且将不同的标识符分配给一对生成树之间的每个计划的连接。

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