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：US20050099955A1

公开(公告)日：2005-05-12

申请号：US10880867

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： G01R31/08 ,  G06F11/00 ,  G08C15/00 ,  H04J1/16 ,  H04J3/14 ,  H04L1/00 ,  H04L12/26

CPC分类号： H04L43/0811 ,  H04L1/24 ,  H04L12/462 ,  H04L41/0677 ,  H04L43/10

摘要： Ethernet OAM may be used to trace a path on an Ethernet network. If the path reaches the destination, there is no fault. If the path doesn't reach the destination, the network element farthest along the path is adjacent the fault. The path trace may be used from both ends of a given path to confirm the presence of a single fault or to determine the likelihood of multiple faults on the path. A path trace Ethernet OAM frame may be issued on the network with instructions that network elements with knowledge of a destination address should respond. If a network element knows the destination address, the receiving network element responds to the initiating network element with a unicast OAM frame and forwards the OAM frame if possible. The sequence of unicast response frames allows the initiating network element to build a path through the network toward the destination element and identify where the path stops.

摘要翻译： 以太网OAM可用于跟踪以太网上的路径。 如果路径到达目的地，则没有故障。 如果路径没有到达目的地，则沿路径最远的网络元素与故障相邻。 可以从给定路径的两端使用路径跟踪，以确认单个故障的存在或确定路径上多个故障的可能性。 可以在网络上发出路径跟踪以太网OAM帧，其指令是具有目的地地址知识的网络元素应该响应。 如果网元知道目的地址，则接收网络单元用单播OAM帧对发起的网元进行响应，如果可能，转发OAM帧。 单播响应帧的顺序允许发起网络元件通过网络向目的地元素建立路径，并且识别路径停止的位置。

公开(公告)号：US20050099949A1

公开(公告)日：2005-05-12

申请号：US10880876

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： G01R31/08 ,  H04L12/56

CPC分类号： H04L47/10

摘要： Ethernet OAM domains may be defined by defining reference points on the Ethernet network and using the reference points to insert and extract Ethernet OAM flows. The reference points may be network elements at the edge of a provider's domain, customer elements, or network elements configured to perform OAM flow handoffs between domains. By defining OAM multicast addresses and OAM flow identifiers, and allowing the reference points to be addressed by the multicast address and filtering to be performed by the reference points based on the OAM flow identifiers, OAM flows may be defined on the network. For example, customer-customer OAM flows may be defined, intra-provider and inter-provider OAM flows may be defined, and various segment OAM flows may be defined. An OAM frame format is provided to enable the OAM flows to be carried in a conventional Ethernet network.

摘要翻译： 可以通过在以太网上定义参考点并使用参考点插入和提取以太网OAM流来定义以太网OAM域。 参考点可以是提供商域的边缘处的网络元件，客户元素或被配置为在域之间执行OAM流切换的网络元件。 通过定义OAM多播地址和OAM流标识符，并且允许基于OAM流标识符的多播地址和由参考点执行的过滤来引用参考点，可以在网络上定义OAM流。 例如，可以定义客户 - 客户OAM流，可以定义内部提供商和提供商之间的OAM流，并且可以定义各种分段OAM流。 提供OAM帧格式以使得OAM流能够在传统的以太网中承载。

公开(公告)号：US20050099951A1

公开(公告)日：2005-05-12

申请号：US10881292

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： H04L12/26

CPC分类号： H04L43/0811 ,  H04L43/10 ,  H04L45/28

摘要： Ethernet OAM connectivity check may be used to detect connectivity failures across a given pair of network elements on an Ethernet network. Connectivity check frames are generated and sent to a specific unicast DA or to a multicast DA. Once a network element begins to receive connectivity check frames, it expects to continue to receive further periodic connectivity check frames from that network element. If the network element stops receiving periodic connectivity check frames, it detects that connectivity to the sending network element is broken. Once a fault is identified, the fault may be verified using a loopback function, which causes a network element receiving an Ethernet frame to transmit a corresponding frame back to the original network element. Loopback may be intrusive such that all received frames are looped back except OAM frames, or non-intrusive where only OAM frames are looped back.

摘要翻译： 以太网OAM连接检查可用于检测以太网上给定的一对网络上的连接故障。 生成连通性检查帧并将其发送到特定的单播DA或多播DA。 一旦网络元件开始接收连接性检查帧，它将期望从该网络元件继续接收进一步的周期性连接性检查帧。 如果网络元件停止接收周期性连接检查帧，则它检测到与发送网元的连接断开。 一旦识别到故障，就可以使用环回功能验证故障，这使得接收以太网帧的网络单元将相应的帧传送回原始网络单元。 环回可能是侵扰性的，使得除了OAM帧之外，所有接收到的帧都被环回，或者只有OAM帧被环回的非侵入帧。

公开(公告)号：US08953456B2

公开(公告)日：2015-02-10

申请号：US13047128

申请日：2011-03-14

申请人： Dinesh Mohan ,  Marc Holness

发明人： Dinesh Mohan ,  Marc Holness

IPC分类号： G01R31/08 ,  H04L12/26 ,  H04L12/24

CPC分类号： H04L43/08 ,  H04L41/04 ,  H04L43/0852

摘要： Maintenance entities may be defined between customer and provider flow points to allow performance management to take place on an Ethernet network. The maintenance entities may be defined for access link, intra-domain, and inter-domain, and may be defined on a link or service basis. The maintenance entities may be used to monitor performance within a network or across networks, and may be used to monitor various performance parameters, such as frame loss, frame delay, frame delay variation, availability, errored frame seconds, service status, frame throughput, the number of frames transmitted, received or dropped, the status of a loopback interface, the amount of time a service has been unavailable, and many other parameters. Several management mechanisms may be used, and the measurements may be collected using a solicited collection method, in which a response is required and collected, or an unsolicited collection method in which a response is not required.

摘要翻译： 可以在客户和供应商流量点之间定义维护实体，以允许在以太网上进行性能管理。 维护实体可以被定义用于接入链路，域内和域间，并且可以基于链路或服务来定义。 维护实体可以用于监视网络内或网络之间的性能，并且可以用于监视各种性能参数，例如帧丢失，帧延迟，帧延迟变化，可用性，错误帧秒，服务状态，帧吞吐量， 发送，接收或丢弃的帧数，环回接口的状态，服务不可用的时间量以及许多其他参数。 可以使用几种管理机制，并且可以使用在其中需要和收集响应的请求收集方法来收集测量值，或者不需要响应的非请求收集方法。

公开(公告)号：US20060031482A1

公开(公告)日：2006-02-09

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： G06F15/173 ,  G06F11/00

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：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：US20110164502A1

公开(公告)日：2011-07-07

申请号：US13047128

申请日：2011-03-14

申请人： Dinesh Mohan ,  Marc Holness

发明人： Dinesh Mohan ,  Marc Holness

IPC分类号： H04L12/26

CPC分类号： H04L43/08 ,  H04L41/04 ,  H04L43/0852

摘要： Maintenance entities may be defined between customer and provider flow points to allow performance management to take place on an Ethernet network. The maintenance entities may be defined for access link, intra-domain, and inter-domain, and may be defined on a link or service basis. The maintenance entities may be used to monitor performance within a network or across networks, and may be used to monitor various performance parameters, such as frame loss, frame delay, frame delay variation, availability, errored frame seconds, service status, frame throughput, the number of frames transmitted, received or dropped, the status of a loopback interface, the amount of time a service has been unavailable, and many other parameters. Several management mechanisms may be used, and the measurements may be collected using a solicited collection method, in which a response is required and collected, or an unsolicited collection method in which a response is not required.

摘要翻译： 可以在客户和供应商流量点之间定义维护实体，以允许在以太网上进行性能管理。 维护实体可以被定义用于接入链路，域内和域间，并且可以基于链路或服务来定义。 维护实体可以用于监视网络内或跨网络的性能，并且可以用于监视各种性能参数，例如帧丢失，帧延迟，帧延迟变化，可用性，错误帧秒，服务状态，帧吞吐量， 发送，接收或丢弃的帧数，环回接口的状态，服务不可用的时间量以及许多其他参数。 可以使用几种管理机制，并且可以使用需要和收集响应的请求收集方法来收集测量值，或者不需要响应的非请求收集方法。

公开(公告)号：US07924725B2

公开(公告)日：2011-04-12

申请号：US10881296

申请日：2004-06-30

申请人： Dinesh Mohan ,  Marc Holness

发明人： Dinesh Mohan ,  Marc Holness

IPC分类号： G01R31/08

CPC分类号： H04L43/08 ,  H04L41/04 ,  H04L43/0852

摘要： Maintenance entities may be defined between customer or provider flow points for performance management on an Ethernet network. The maintenance entities may be defined for access link, intra-domain, and inter-domain, and may be defined on a link or service basis. The maintenance entities may be used to monitor performance within a network or across networks, and may be used to monitor various performance parameters, such as frame loss, frame delay, frame delay variation, availability, errored frame seconds, service status, frame throughput, the number of frames transmitted, received or dropped, the status of a loopback interface and/or the amount of time a service has been unavailable. Several management mechanisms may be used, and the measurements may be collected using a solicited collection method, in which a responses are required and collected, or an unsolicited collection method in which a response is not required.

摘要翻译： 可以在客户或供应商流量点之间定义维护实体，以便在以太网上进行性能管理。 维护实体可以被定义用于接入链路，域内和域间，并且可以基于链路或服务来定义。 维护实体可以用于监视网络内或跨网络的性能，并且可以用于监视各种性能参数，例如帧丢失，帧延迟，帧延迟变化，可用性，错误帧秒，服务状态，帧吞吐量， 发送，接收或丢弃的帧数，环回接口的状态和/或服务不可用的时间量。 可以使用几种管理机制，并且可以使用其中需要和收集响应的请求收集方法或者不需要响应的非请求收集方法来收集测量结果。

公开(公告)号：US07590054B1

公开(公告)日：2009-09-15

申请号：US11225952

申请日：2005-09-14

申请人： Marc Holness ,  Dinesh Mohan ,  Beata Mirek

发明人： Marc Holness ,  Dinesh Mohan ,  Beata Mirek

IPC分类号： G06F11/00

CPC分类号： H04L12/4633

摘要： Protection switching in an Ethernet packet-switched network includes establishing first and second virtual circuits. The first virtual circuit carries packet traffic associated with a different service instance from packet traffic carried by the second virtual circuit. Packet traffic of the first virtual circuit is transmitted from a source network element to a sink network element through a first Ethernet tunnel. Packet traffic of the second virtual circuit is transmitted from the same source network element to the same sink network element through a second Ethernet tunnel. The second Ethernet tunnel is a different path through the Ethernet packet-switched network from the first Ethernet tunnel. During a protection switch, the first virtual circuit is switched from the first Ethernet tunnel to the second Ethernet tunnel. After the switch, packet traffic of the first virtual circuit and packet traffic of the second virtual circuit are transmitted over the second Ethernet tunnel.

摘要翻译： 以太网分组交换网络中的保护倒换包括建立第一和第二虚拟电路。 第一虚拟电路从与第二虚拟电路携带的分组业务携带与不同服务实例相关联的分组业务。 第一虚拟电路的分组业务通过第一以太网隧道从源网元发送到宿网元。 第二虚拟电路的分组业务通过第二以太网隧道从同一源网元发送到同一宿网元。 第二个以太网隧道是从第一个以太网隧道通过以太网分组交换网络的不同路径。 在保护开关期间，第一虚拟电路从第一以太网隧道切换到第二以太网隧道。 在切换之后，通过第二以太网隧道传输第一虚拟电路的分组业务和第二虚拟电路的分组业务。