公开(公告)号：US07152115B2

公开(公告)日：2006-12-19

申请号：US10191660

申请日：2002-07-09

申请人： Hamid H. Ould Brahim ,  Dinesh Mohan ,  Vasile Radoaca ,  Michael Chen

发明人： Hamid H. Ould Brahim ,  Dinesh Mohan ,  Vasile Radoaca ,  Michael Chen

IPC分类号： G06F15/173 ,  H04L12/66 ,  G01R31/08

CPC分类号： H04L45/00 ,  H04L12/4675 ,  H04L45/50 ,  Y02D30/32

摘要： A network can be organized for providing virtual private network services to customers into two regions. A network core for providing layer 2 transport and an associated number of logical provider edges. Each logical provider edge is partitioned into first and second portions. The first portion provides virtual private network services to customers. The second portion works with the core network to communicate with any other logical provider edge within the network. The first portion designated as the PE-Edge includes a group of functions such as a function for configuring optical Ethernet layer 2 virtual private network service, a function for service labeling, a function for ingress traffic management, and a function for information exchange between local VPN and core VPN. The second portion designated as PE-Core includes a group of functions such as a function for distributing service labels, a function for distributing information on transport tunnels, a function for information exchange between local and core VPN. Within the logical provider edge or Logical PE, the PE-Edge and PE-Core communicate via a layer 2 network.

公开(公告)号：US20080101241A1

公开(公告)日：2008-05-01

申请号：US11724981

申请日：2007-03-16

申请人： Dinesh Mohan ,  Christopher Monti ,  Piotr Romanus ,  David Tsang ,  Michael Chen

发明人： Dinesh Mohan ,  Christopher Monti ,  Piotr Romanus ,  David Tsang ,  Michael Chen

IPC分类号： H04L12/26

CPC分类号： H04L41/0213 ,  H04L12/4641

摘要： OAM may be implemented at an intermediate node on a PBT trunk in an Ethernet network by causing OAM frames to be addressed to the PBT trunk endpoint but causing the OAM frames to carry an indicia (Ether-type, OpCode, TLV value or combination of these and other fields) that the OAM frames are intended to be used for intermediate node OAM functions. The Ether-type, OpCode, and TLV values may be standardized values, or vendor specific values such as OpCode=51 or TLV=31 may be used. Addressing the OAM frames to the PBT trunk end point enables the OAM frames to follow the PBT trunk through the network. The OAM indicia signals to the intermediate nodes that the OAM frames are intended to be used to perform an intermediate node OAM function. The OAM frames may contain reverse trunk information to prevent the intermediate nodes from being required to store correlation between forward and reverse PBT trunks.

摘要翻译： OAM可以通过使OAM帧被寻址到PBT中继端点而实现在以太网网络中的PBT中继的中间节点上，但是导致OAM帧携带标记（以太类型，OpCode，TLV值或这些的组合 和其他字段），OAM帧旨在用于中间节点OAM功能。 以太类型，OpCode和TLV值可以是标准化值，或者可以使用诸如OpCode = 51或TLV = 31的供应商特定值。 将OAM帧寻址到PBT中继端点使得OAM帧能够通过网络跟随PBT中继。 OAM标记向中间节点发信号通知OAM帧旨在用于执行中间节点OAM功能。 OAM帧可能包含反向中继信息，以防止中间节点需要存储正向和反向PBT中继线之间的相关性。

公开(公告)号：US09059918B2

公开(公告)日：2015-06-16

申请号：US13561040

申请日：2012-07-29

申请人： Dinesh Mohan ,  Paul Unbehagen ,  Srikanth Keesara

发明人： Dinesh Mohan ,  Paul Unbehagen ,  Srikanth Keesara

IPC分类号： H04L12/26 ,  H04L29/06 ,  H04L12/24 ,  H04L12/751

CPC分类号： H04L43/10 ,  H04L41/12 ,  H04L45/02 ,  H04L63/00 ,  H04L69/00

摘要： An OAM link trace message is sent from a source node to a target node in a link state protocol controlled Ethernet network. The link trace message uses an 802.1ag format except, as a destination address, it uses either the unicast Ethernet MAC node ID of the target node or the multicast destination address of the service instance. Network topology verification in a link state protocol controlled Ethernet network checks the link state protocol database at a node to ascertain the control plane topology view of at least part of the network. One or more Ethernet OAM commands from the node are executed to ascertain the data plane topology view of the same part of the network. The control plane topology view of the network is compared to the data plane topology view of the network to see if they match. An error is flagged if they do not match.

摘要翻译： OAM链路跟踪消息从源节点发送到链路状态协议控制的以太网中的目标节点。 链路跟踪消息使用802.1ag格式，除了作为目的地址，它使用目标节点的单播以太网MAC节点ID或服务实例的组播目的地址。 链路状态协议控制的以太网网络中的网络拓扑验证检查节点处的链路状态协议数据库，以确定至少部分网络的控制平面拓扑视图。 执行来自节点的一个或多个以太网OAM命令以确定网络的相同部分的数据平面拓扑视图。 将网络的控制平面拓扑视图与网络的数据平面拓扑视图进行比较，看它们是否匹配。 如果错误不匹配，则会被标记。

公开(公告)号：US08862943B2

公开(公告)日：2014-10-14

申请号：US11137015

申请日：2005-05-25

申请人： Dinesh Mohan ,  Marc Holness

发明人： Dinesh Mohan ,  Marc Holness

IPC分类号： G06F11/00 ,  H04L12/46 ,  H04L12/24

CPC分类号： G06F11/0772 ,  H04L12/4641 ,  H04L41/0631 ,  H04L41/0663 ,  H04L41/0677 ,  H04L41/0686 ,  Y02D30/30

摘要： Connectivity fault notification is provided by generating an alarm indication signal at a device that is logically adjacent to the fault, and forwarding the alarm indication signal upward through various levels to at least one client level entity. The alarm indication signal may be suppressed at any level for a service instance if service is restored at that level, or if a protection path prevents disruption of the service instance at that level, or auto-suppressed at an originating node based on number of times transmitted or elapsed time. The alarm indication signal may include a point of failure indicator such as the MAC address of the device that generates the alarm indication signal, or a failed resource identity such as an IEEE 802.1AB LLDP MAC Service Access Point (“MSAP”). Further, the alarm indication signal may be employed to trigger use of the protection path.

摘要翻译： 通过在与故障逻辑上相邻的设备处产生报警指示信号，并将报警指示信号向上通过各种级别转发到至少一个客户端级实体来提供连接故障通知。 如果服务在该级别被恢复，或者如果保护路径防止在该级别的服务实例的中断或者在始发节点处基于次数自动抑制，则可以在服务实例的任何级别上抑制警报指示信号 传送或消逝时间。 报警指示信号可以包括诸如生成报警指示信号的设备的MAC地址或诸如IEEE 802.1AB LLDP MAC服务接入点（“MSAP”）之类的故障资源标识的故障点指示器。 此外，可以采用报警指示信号来触发保护路径的使用。

公开(公告)号：US20110058483A1

公开(公告)日：2011-03-10

申请号：US12886630

申请日：2010-09-21

申请人： Dinesh Mohan ,  David Allan

发明人： Dinesh Mohan ,  David Allan

IPC分类号： H04L12/26

CPC分类号： H04L43/00 ,  H04L12/4625 ,  H04L41/046 ,  H04L41/0893 ,  H04L43/0811

摘要： Described is a process and system for providing an extensible forwarding plane data communications channel adapted to selectively support operations, administration and maintenance (OAM) activity within one or more different domains of an Ethernet transport network. The data communication channel is established using Ethernet protocol data units forwarded within the forwarding plane, between network elements. The Ethernet protocol data units can be Ethernet OAM frames modified to include an OpCode indicative of a maintenance communication channel. The OAM frames are generated at a selected one of the network elements (source), forwarded along the same network path as the Ethernet frames, and terminate at another network element (destination) associated with a maintenance level identified within the OAM frame. The source and destination network elements can reside on a domain boundary using the Ethernet OAM frames flowing therebetween to relay maintenance communications channel messages.

摘要翻译： 描述了用于提供可扩展的转发平面数据通信信道的过程和系统，其适于选择性地支持以太网传输网络的一个或多个不同域内的操作，管理和维护（OAM）活动。 使用在转发平面内转发的以太网协议数据单元在网元之间建立数据通信信道。 以太网协议数据单元可以是修改为包括指示维护通信信道的OpCode的以太网OAM帧。 在所选网络元件（源）中生成OAM帧，其沿着与以太网帧相同的网络路径转发，并终止于与OAM帧内识别的维护级别相关联的另一网络元件（目的地）。 源和目标网元可以使用在其间流动的以太网OAM帧来驻留在域边界上，以中继维护通信信道消息。

公开(公告)号：US07821949B2

公开(公告)日：2010-10-26

申请号：US11996561

申请日：2006-09-12

申请人： Dinesh Mohan ,  David Allan

发明人： Dinesh Mohan ,  David Allan

IPC分类号： G06F11/00

CPC分类号： H04L43/00 ,  H04L12/4625 ,  H04L41/046 ,  H04L41/0893 ,  H04L43/0811

摘要： Described is a process and system for providing an extensible forwarding plane data communications channel adapted to selectively support operations, administration and maintenance (OAM) activity within one or more different domains of an Ethernet transport network. The data communication channel is established using Ethernet protocol data units forwarded within the forwarding plane, between network elements. The Ethernet protocol data units can be Ethernet OAM frames modified to include an OpCode indicative of a maintenance communication channel. The OAM frames are generated at a selected one of the network elements (source), forwarded along the same network path as the Ethernet frames, and terminate at another network element (destination) associated with a maintenance level identified within the OAM frame. The source and destination network elements can reside on a domain boundary using the Ethernet OAM frames flowing therebetween to relay maintenance communications channel messages.

摘要翻译： 描述了用于提供可扩展的转发平面数据通信信道的过程和系统，其适于选择性地支持以太网传输网络的一个或多个不同域内的操作，管理和维护（OAM）活动。 使用在转发平面内转发的以太网协议数据单元在网元之间建立数据通信信道。 以太网协议数据单元可以是修改为包括指示维护通信信道的OpCode的以太网OAM帧。 在所选网络元件（源）中生成OAM帧，其沿着与以太网帧相同的网络路径转发，并终止于与OAM帧内识别的维护级别相关联的另一网络元件（目的地）。 源和目标网元可以使用在其间流动的以太网OAM帧来驻留在域边界上，以中继维护通信信道消息。

公开(公告)号：US20100226376A1

公开(公告)日：2010-09-09

申请号：US12785527

申请日：2010-05-24

申请人： Dinesh Mohan ,  Hamid Ould Brahim

发明人： Dinesh Mohan ,  Hamid Ould Brahim

IPC分类号： H04L12/56

CPC分类号： H04L45/50 ,  H04L12/2856 ,  H04L12/2859 ,  H04L12/4633 ,  H04L12/4658 ,  H04L12/4662

摘要： Frames of customer traffic may be encapsulated by adding Mac-in-Mac (MiM) encapsulation fields for transportation of the frames over a portion of provider network. The MiM encapsulated traffic may be further encapsulated using VPLS by adding VPLS encapsulation fields for transportation of the frames over another portion of the provider network. The MiM encapsulations use provider network MAC addresses which enables VPLS MAC learning to occur using provider network MAC address space. MiM tunnels are mapped to VPLS service instances which are assigned pseudowire tags for transportation over the VPLS portion of provider network. The MiM header is retained when the MiM encapsulated frames are transported over the VPLS portion of the provider network. As VPLS frames exit the core network, the VPLS encapsulation fields are removed to extract the original MiM encapsulated frames for further transportation over the MiM portion of the provider network.

摘要翻译： 客户流量的框架可以通过添加Mac-in-Mac（MiM）封装字段来封装，用于在提供商网络的一部分上传输帧。 可以通过添加用于在提供商网络的另一部分上传送帧的VPLS封装字段来使用VPLS进一步封装MiM封装的流量。 MiM封装使用提供商网络MAC地址，使得可以使用提供商网络MAC地址空间进行VPLS MAC学习。 MiM隧道映射到VPLS服务实例，VPLS服务实例被分配伪线标签，用于通过供应商网络的VPLS部分进行传输。 当MiM封装的帧通过提供商网络的VPLS部分传输时，MiM头部被保留。 由于VPLS帧离开核心网络，VPLS封装字段被删除，以提取原始的MiM封装帧，以便在提供商网络的MiM部分进一步传输。

公开(公告)号：US20090059800A1

公开(公告)日：2009-03-05

申请号：US12006291

申请日：2007-12-31

申请人： Dinesh Mohan

发明人： Dinesh Mohan

IPC分类号： G06F11/00

CPC分类号： H04L41/0659 ,  H04L12/462 ,  H04L41/00 ,  H04L41/06 ,  H04L41/0668 ,  H04L41/0893 ,  H04L43/0811 ,  H04L45/122 ,  H04L45/22 ,  H04L45/48

摘要： A control protocol is run in the interconnect region between network domains so that the interconnect region may be managed using a separate control plane. According to an embodiment of the invention, a spanning tree protocol is used to establish a separate spanning tree within the interconnect region. To avoid loop formation within the interconnect region, links interconnecting adjacent edge nodes that are part of the interconnect region and which belong to a given domain are allowed to pass control frames but not data frames. OAM may be used detect link failure of a link between adjacent nodes on a given domain.

摘要翻译： 控制协议在网络域之间的互连区域中运行，使得可以使用单独的控制平面来管理互连区域。 根据本发明的实施例，生成树协议用于在互连区域内建立单独的生成树。 为了避免互连区域内的环路形成，互连作为互连区域一部分并且属于给定域的相邻边缘节点的链路被允许传递控制帧而不是数据帧。 可以使用OAM在给定域上的相邻节点之间的链路的检测链路故障。

公开(公告)号：US20050099954A1

公开(公告)日：2005-05-12

申请号：US10881565

申请日：2004-06-30

申请人： Dinesh Mohan ,  Timothy Mancour ,  Marc Holness

发明人： Dinesh Mohan ,  Timothy Mancour ,  Marc Holness

IPC分类号： H04L12/28

CPC分类号： H04L41/12 ,  H04L12/462 ,  H04L41/0213

摘要： Network topography may be discovered by a network element on an Ethernet network by collecting connectivity check messages periodically issued by other network elements on the network and using the information gleaned from those messages to build a topography database. Since the connectivity check messages may be link level or service instance based, the topography database may include network topography as well as service topography on the Ethernet network. Ethernet OAM loopback frames may also be used to cause network elements on the Ethernet network to issue response frames directed to the initiating network element. By collecting responses from the responding network elements, the initiating network element can build a topography database of network elements on the Ethernet network. This topography database may show the overall network topography or service instances on the network, and may provide visibility within one or more domains.

摘要翻译： 通过收集由网络上的其他网络元件定期发布的连接性检查消息并使用从这些消息中收集的信息来构建地形数据库，网络拓扑可以由以太网上的网络元件发现。 由于连接性检查消息可以是基于链路级或服务实例，所以地形数据库可以包括以太网上的网络拓扑以及服务拓扑。 以太网OAM回环帧也可以用于使以太网上的网元发出指向发起网元的响应帧。 通过从响应的网络元件收集响应，发起网元可以在以太网上构建网元的地形数据库。 该地形数据库可以显示网络上的整体网络拓扑或服务实例，并且可以在一个或多个域内提供可见性。

公开(公告)号：US08918538B2

公开(公告)日：2014-12-23

申请号：US13173807

申请日：2011-06-30

申请人： Dinesh Mohan ,  Paul Unbehagen ,  Srikanth Keesara

发明人： Dinesh Mohan ,  Paul Unbehagen ,  Srikanth Keesara

IPC分类号： G06F15/173 ,  H04L12/26 ,  H04L29/06

CPC分类号： H04L43/10 ,  H04L41/12 ,  H04L45/02 ,  H04L63/00 ,  H04L69/00

摘要： Ethernet OAM MEPs are automatically configured in a link state protocol controlled Ethernet network. A node operating in the link state protocol controlled Ethernet network receives a Link State PDU (LSP) containing a TLV having a MEP associated with the Ethernet MAC node ID of a second node in the link state protocol controlled Ethernet network, where the path between the first and second node includes a plurality of links. The node updates a forwarding table to indicate an association between the MEP ID and a Ethernet MAC node ID of the second node. An Ethernet OAM maintenance endpoint is produced in a link state protocol controlled Ethernet network by hashing a Sys-ID to produce a MEP; storing the MEP in a TLV; and forwarding the TLV over the link state protocol controlled Ethernet network in an LSP.

摘要翻译： 以太网OAM MEP自动配置在链路状态协议控制的以太网中。 在链路状态协议控制的以太网中操作的节点接收链路状态PDU（LSP），链路状态PDU（LSP）包含具有与链路状态协议控制的以太网中的第二节点的以太网MAC节点ID相关联的MEP的TLV， 第一和第二节点包括多个链接。 节点更新转发表以指示MEP ID与第二节点的以太网MAC节点ID之间的关联。 在链路状态协议控制的以太网网络中产生以太网OAM维护端点，通过散列Sys-ID产生MEP; 将MEP存储在TLV中; 并通过链路状态协议控制的以太网在LSP中转发TLV。