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公开(公告)号：US20140286334A1
公开(公告)日：2014-09-25
申请号：US14299118
申请日：2014-06-09
发明人： David Allan , Nigel Bragg , Jerome Chiabaut
IPC分类号： H04L12/707
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 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.
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。 链接ID从最低到最高排列，以便于路径的排名。 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。 然后将路径重新排列，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第二组不同路径。
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公开(公告)号：US20140269433A1
公开(公告)日：2014-09-18
申请号：US14291121
申请日：2014-05-30
发明人： David Allan , Malcolm Betts , Nigel Bragg , Peter Ashwood Smith , Paul Unbehagen
IPC分类号： H04L12/751 , H04L12/721
摘要： Multicast capabilities of a link state protocol controlled network are used to accelerate the flooding advertisement of topology change notifications within portions of the network. This flooding mechanism may be particularly efficient in a network with a large number of two-connected nodes such as a ring network architecture. A control plane specific multicast group address is used when flooding topology change notifications, and a process such as reverse path forwarding check is used as an additional control on forwarding of the notification to prevent looping of control plane packets. Two-connected nodes insert a forwarding entry into their FIB to enable frames containing the control message to be forwarded via the data plane on to the downstream node so that propagation of the control message along a chain of two-connected nodes may occur at data plane speeds.
摘要翻译： 链路状态协议控制网络的组播功能用于加速网络部分内的拓扑变化通知的泛洪广告。 这种洪泛机制在具有大量双连接节点（例如环网架构）的网络中可能是特别有效的。 泛洪拓扑变化通知时使用控制平面特定的组播组地址，并且使用诸如反向路径转发检查之类的过程作为通知转发的附加控制，以防止控制平面分组的循环。 双连接节点将转发条目插入到其FIB中，以使包含控制消息的帧能够经由数据平面转发到下游节点，使得控制消息沿双连接节点链的传播可能发生在数据平面 速度。
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3.发明授权Resilient provider link state bridging (PLSB) virtual private LAN service (VPLS) interworking 有权灵活的提供商链路状态桥接（PLSB）虚拟专用局域网服务（VPLS）互通公开(公告)号：US09100316B2
公开(公告)日：2015-08-04
申请号：US14034698
申请日：2013-09-24
IPC分类号： H04L12/28 , H04L12/721 , H04L12/46 , H04L12/707 , H04L12/703 , H04L12/803
CPC分类号： H04L45/12 , H04L12/4625 , H04L45/22 , H04L45/28 , H04L47/125
摘要： A method of peer interfacing a Link-State controlled network domain with an Ethernet Bridging controlled network domain. A pair of peer attachment points are provided between the Link-State controlled network domain and the Ethernet Bridging domain. The peer attachment points are respective endpoints of a set of one or more LAN segments defined within the Ethernet Bridging domain. The set of LAN segments are represented as a virtual node in the Link-State controlled network domain. The virtual node is represented in the Link-State controlled network domain as connected to each of the peer attachment points via a respective virtual link. The virtual links are configured such that frames to or from an address in the Link-State controlled network domain are forwarded over a tree passing through only one of the peer attachments points.
摘要翻译： 链路状态控制网络对等接口与以太网桥接控制网络域的方法。 在链路状态控制的网络域和以太网桥接域之间提供了一对对等连接点。 对等连接点是在以太网桥接域内定义的一个或多个LAN段的集合的相应端点。 LAN段的集合在链路状态控制的网络域中表示为虚拟节点。 在链路状态控制的网络域中，虚拟节点通过相应的虚拟链路连接到每个对等连接点。 虚拟链路被配置为使得到链路状态控制的网络域中的或来自链路状态受控网络域中的帧的帧在仅通过对等附件点之一的树上转发。
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公开(公告)号：US20140095678A1
公开(公告)日：2014-04-03
申请号：US14045238
申请日：2013-10-03
发明人： David Allan
IPC分类号： H04L12/24
CPC分类号： H04L41/0869 , H04L41/0873 , H04L63/0272
摘要： Described are mechanisms for verifying configuration information in 2547 BGP VPNs. An originating PE generates a first knowledge digest encoding first configuration information associated with a current set of information advertised for a VRF. The originating PE also generates a second knowledge digest encoding second configuration information associated with cumulative information advertised for the VRF. The originating PE is capable of receiving a message from a user PE, the message including a third knowledge digest encoding third configuration information related to the user VRF. The originating PE is capable of comparing the first knowledge digest to the third knowledge digest and producing a first indication if the third configuration information encoded in the third knowledge digest is not a subset of the first configuration information encoded in the first knowledge digest.
摘要翻译： 描述了2547个BGP VPN中验证配置信息的机制。 始发PE生成与为VRF通告的当前信息集相关联的第一配置信息的第一知识摘要。 始发PE还生成与为VRF通告的累积信息相关联的第二配置信息的第二知识摘要。 始发PE能够从用户PE接收消息，该消息包括编码与用户VRF相关的第三配置信息的第三知识摘要。 如果第三知识摘要中编码的第三配置信息不是第一知识摘要中编码的第一配置信息的子集，则始发PE能够将第一知识摘要与第三知识摘要进行比较，并产生第一指示。
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5.发明授权公开(公告)号：US08553697B2
公开(公告)日：2013-10-08
申请号：US13715421
申请日：2012-12-14
发明人： David Allan , Nigel Bragg , Marc Holness , Robert Friskney , Simon Parry
CPC分类号： H04L49/604 , H04L12/4662 , H04L12/66 , H04L45/22 , H04L45/28
摘要： An Ethernet virtual switched sub-network (VSS) is implemented as a virtual hub and spoke architecture overlaid on hub and spoke connectivity built of a combination of Provider Backbone Transport (spokes) and a provider backbone bridged sub-network (hub). Multiple VSS instances are multiplexed over top of the PBT/PBB infrastructure. A loop free resilient Ethernet carrier network is provided by interconnecting Provider Edge nodes through access sub-networks to Provider Tandems to form Provider Backbone Transports spokes with a distributed switch architecture of the Provider Backbone Bridged hub sub-network. Provider Backbone transport protection groups may be formed from the Provider Edge to diversely homed Provider Tandems by defining working and protection trunks through the access sub-network. The Provider Backbone Transport trunks are Media Access Control (MAC) addressable by the associated Provider Edge address or by a unique address associated with the protection group in the Provider Backbone Bridged network domain.
摘要翻译： 以太网虚拟交换子网（VSS）被实现为覆盖在由提供商骨干传输（辐射）和提供商骨干桥接子网（集线器））组合的集线器和辐条连接上的虚拟集线器和分支架构。 多个VSS实例在PBT / PBB基础结构的顶部进行复用。 通过将Provider Edge节点通过接入子网络互连到Provider Tandem来提供无循环的弹性以太网运营商网络，以形成具有提供商骨干桥接子网络的分布式交换机架构的Provider Backbone Transports辐条。 提供商骨干传输保护组可以通过在接入子网中定义工作和保护中继，从提供商边缘形成多样化的提供商串联。 提供商骨干传输干线是可由相关联的提供商边缘地址寻址的媒体访问控制（MAC）或通过与提供商骨干桥接网络域中的保护组相关联的唯一地址。
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6.发明申请公开(公告)号：US20140301244A1
公开(公告)日：2014-10-09
申请号：US14310767
申请日：2014-06-20
发明人： David Allan , Nigel Bragg , Paul Unbehagen , Peter Ashwood Smith , Yin Guoli
IPC分类号： H04L12/24
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 in 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. The L1/L2/L1 network structure may recurse an arbitrary number of times.
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公开(公告)号：US20140129722A1
公开(公告)日：2014-05-08
申请号：US13668649
申请日：2012-11-05
发明人： Liam Casey , David Allan
IPC分类号： H04N21/25
CPC分类号： H04N21/6125 , H04L12/6418 , H04L65/1069 , H04L65/1073 , H04L69/22
摘要： A pseudo-wire merge is disclosed. Communicating with a first communication server enables registration of a first endpoint with the first communication server thereby enabling the first endpoint to establish a communication session under control of the first communication server with a second endpoint coupled to the communication network. Communicating with a second communication server enables registration of the first endpoint with the second communication server while the first endpoint is registered with the first communication server thereby enabling the first endpoint to establish a communication session over the communication network selectively either under the control of the second communication server or under the control of the first communication server.
摘要翻译： 公开了伪线合并。 与第一通信服务器通信使得能够将第一端点注册到第一通信服务器，从而使得第一端点能够在第一通信服务器的控制下建立与耦合到通信网络的第二端点的通信会话。 与第二通信服务器通信使得第一端点能够与第二通信服务器注册，同时第一端点被注册到第一通信服务器，从而使得第一端点可以选择性地在第二通信服务器的控制下在通信网络上建立通信会话 通信服务器或第一通信服务器的控制下。
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8.发明授权公开(公告)号：US08644313B2
公开(公告)日：2014-02-04
申请号：US13667547
申请日：2012-11-02
发明人： Jérôme 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。
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公开(公告)号：US20130070586A1
公开(公告)日：2013-03-21
申请号：US13676472
申请日：2012-11-14
发明人： Robert Friskney , Simon Parry , David Allan , Nigel Bragg
IPC分类号： H04L12/24
CPC分类号： H04L45/28 , H04L41/06 , H04L41/0681 , H04L41/0806 , H04L49/555 , H04L2012/5627
摘要： A shared (proxy) OAM session is performed in a packet-based network on behalf of a plurality of connections. First and second connections are each routed between respective nodes of the network for carrying data traffic. The second connection shares a portion of the routing of the first connection. The shared OAM session is performed along a path which is co-routed with at least part of the shared portion of the routing of the first connection and the second connection. Failure notification signalling is propagated to an endpoint node of each of the first and second connections when the shared OAM session indicates a failure has occurred. The use of a shared OAM session reduces processing at nodes and reduces OAM traffic. Each connection can be a trunk, such as a PBT/PBB-TE trunk, or a service carried within a trunk.
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10.发明授权公开(公告)号：US08964531B2
公开(公告)日：2015-02-24
申请号：US14195320
申请日：2014-03-03
IPC分类号： G01R31/08 , H04L12/24 , H04L12/751 , H04L12/709 , H04L12/753 , H04L12/707 , H04L12/66 , H04L12/891 , H04L12/741
CPC分类号： H04L41/0654 , H04L12/66 , H04L45/02 , H04L45/22 , H04L45/245 , H04L45/48 , H04L45/74 , H04L47/41 , H04L2212/00 , Y02D50/30
摘要： A system for interfacing a client system in a first network domain with a Provider Link State Bridging (PLSB) domain includes at least two Backbone Edge Bridges (BEBs) of the PLSB domain. Each BEB is an end-point of a connection in the first network domain to the client system and an end-point of at least a unicast path in the PLSB domain. An inter-node trunk is provided in the PLSB domain for interconnecting the BEBs. A phantom node is defined in the PLSB domain and is notionally located on the inter-node trunk. Each of the BEBs is configured such that: an ingress packet received from the client system via the connection in the first network domain is forwarded through a path notionally rooted at the phantom node; and an egress packet destined for the client system is forwarded to the client system through the connection in the first network domain.
摘要翻译： 用于将第一网络域中的客户端系统与提供者链路状态桥接（PLSB）域接口的系统包括至少两个PLSB域的骨干边缘桥（BEB）。 每个BEB是第一网络域中的客户端系统的连接端点和PLSB域中至少一个单播路径的端点。 在PLSB域中提供节点间中继以互连BEB。 在PLSB域中定义了虚拟节点，并且概念上位于节点间中继线上。 每个BEB被配置为使得经由第一网络域中的连接从客户端系统接收的入口分组通过一个有意识地根植于虚拟节点的路径转发; 并且去往客户端系统的出口分组通过第一网络域中的连接被转发到客户端系统。
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