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公开(公告)号：US08467316B1
公开(公告)日：2013-06-18
申请号：US12980731
申请日：2010-12-29
申请人： Sri Goli , Ramasamy Ramanathan , Ramanarayanan Ramakrishnan , Sanjiv Doshi , Deepak Ojha , Jagadish Grandhi
发明人： Sri Goli , Ramasamy Ramanathan , Ramanarayanan Ramakrishnan , Sanjiv Doshi , Deepak Ojha , Jagadish Grandhi
IPC分类号： H04L12/28
CPC分类号： H04L12/4625
摘要： In general, techniques are described for enhanced learning in layer two (L2) networks. A first network device of the intermediate network comprising a control unit and an interface may implement these techniques. The control unit executes a loop-prevention protocol (LPP) that determines a bridge identifier associated with a second network device of the intermediate network, where the first and second network devices each couple to a first network. The LPP selects the second network device as a root bridge and detects a topology change that splits the first network into sub-networks. The interface then outputs a message to direct remaining network devices of the intermediate network to clear L2 address information learned when forwarding L2 communications. The message includes the bridge identifier determined by the loop-prevention protocol as the root bridge and directs these remaining network devices to clear only the L2 addresses learned from this bridge identifier.
摘要翻译： 通常，描述了用于在第二层（L2）网络中增强学习的技术。 包括控制单元和接口的中间网络的第一网络设备可以实现这些技术。 所述控制单元执行环路防护协议（LPP），所述环路防护协议（LPP）确定与所述中间网络的第二网络设备相关联的网桥标识符，其中所述第一和第二网络设备每个耦合到第一网络。 LPP选择第二个网络设备作为根桥，并检测将第一个网络划分为子网络的拓扑变化。 然后，接口输出消息，引导中间网络的剩余网络设备清除在转发L2通信时学到的L2地址信息。 该消息包括由循环防范协议确定的桥接标识符作为根网桥，并指示这些剩余的网络设备仅清除从该桥标识符学到的L2地址。
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2.发明申请PACKET LOSS MEASUREMENT AT SERVICE ENDPOINTS OF A VIRTUAL PRIVATE LAN SERVICE 有权虚拟私人局域网服务的服务端点分组丢失测量公开(公告)号：US20120236734A1
公开(公告)日：2012-09-20
申请号：US13049676
申请日：2011-03-16
CPC分类号： H04L12/413 , H04L12/4633 , H04L12/4641 , H04L43/0829
摘要： In general, techniques are described for measuring packet data unit (PDU) loss in a L2 virtual private network (L2VPN) service, such as a VPLS instance. In one example of the techniques, provider edge (PE) routers that participate in the L2VPN measure known unicast and multicast PDU traffic at the service endpoints for the instance to determine unicast PDU loss within the service provider network. As the routers learn the outbound service (i.e., core-facing) interfaces and outbound local (i.e., customer-facing) interfaces for L2 addresses of customer devices that issue packets to the VPLS instance, the routers establish respective unicast transmit and receipt counters for the service endpoints that serve the customer devices. In another example, PE routers that participate in the L2VPN measure multicast PDU traffic at the service endpoints for the instance and account for internal replication by intermediate service nodes to determine multicast PDU loss within the service.
摘要翻译： 通常，描述了用于测量诸如VPLS实例的L2虚拟专用网（L2VPN）服务中的分组数据单元（PDU）丢失的技术。 在技术的一个示例中，参与L2VPN的提供商边缘（PE）路由器测量在实例的服务端点处的已知单播和多播PDU业务，以确定服务提供商网络内的单播PDU丢失。 当路由器学习向VPLS实例发布数据包的客户设备的L2地址的出站服务（即面向核心）接口和出站本地（即面向客户）接口时，路由器建立相应的单播发送和接收计数器 为客户设备服务的服务端点。 在另一个示例中，参与L2VPN的PE路由器测量实例的服务端点的多播PDU流量，并由中间服务节点进行内部复制，以确定服务内的多播PDU丢失。
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公开(公告)号：US08804570B1
公开(公告)日：2014-08-12
申请号：US12971866
申请日：2010-12-17
申请人： Manish Gupta , Ramasamy Ramanathan , Sri Goli
发明人： Manish Gupta , Ramasamy Ramanathan , Sri Goli
CPC分类号： H04L45/02 , H04J3/14 , H04L12/56 , H04L45/507
摘要： A first provider edge (PE) device is configured to: receive a Label Distribution Protocol (LDP) MAC Flush message from a PE device via an input port; flush a routing table in response to the LDP MAC Flush message; determine whether the LDP MAC Flush message comprises a PE identifier corresponding to the PE device; generate a Topology Change Notification (TCN) message based on the LDP MAC Flush message when the LDP MAC Flush message comprises the PE identifier corresponding to the PE device; and output the TCN message.
摘要翻译： 第一提供商边缘（PE）设备被配置为：经由输入端口从PE设备接收标签分发协议（LDP）MAC刷新消息; 刷新路由表以响应LDP MAC Flush消息; 确定LDP MAC Flush消息是否包括与PE设备相对应的PE标识符; 当LDP MAC Flush消息包括与PE设备对应的PE标识符时，基于LDP MAC Flush消息生成拓扑变化通知（TCN）消息; 并输出TCN消息。
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4.发明授权Packet loss measurement at service endpoints of a virtual private LAN service 有权虚拟专用LAN服务的服务端点的丢包测量公开(公告)号：US08665739B2
公开(公告)日：2014-03-04
申请号：US13049676
申请日：2011-03-16
CPC分类号： H04L12/413 , H04L12/4633 , H04L12/4641 , H04L43/0829
摘要： In general, techniques are described for measuring packet data unit (PDU) loss in a L2 virtual private network (L2VPN) service, such as a VPLS instance. In one example of the techniques, provider edge (PE) routers that participate in the L2VPN measure known unicast and multicast PDU traffic at the service endpoints for the instance to determine unicast PDU loss within the service provider network. As the routers learn the outbound service (i.e., core-facing) interfaces and outbound local (i.e., customer-facing) interfaces for L2 addresses of customer devices that issue packets to the VPLS instance, the routers establish respective unicast transmit and receipt counters for the service endpoints that serve the customer devices. In another example, PE routers that participate in the L2VPN measure multicast PDU traffic at the service endpoints for the instance and account for internal replication by intermediate service nodes to determine multicast PDU loss within the service.
摘要翻译： 通常，描述了用于测量诸如VPLS实例的L2虚拟专用网（L2VPN）服务中的分组数据单元（PDU）丢失的技术。 在技术的一个示例中，参与L2VPN的提供商边缘（PE）路由器测量在实例的服务端点处的已知单播和多播PDU业务，以确定服务提供商网络内的单播PDU丢失。 当路由器学习向VPLS实例发布数据包的客户设备的L2地址的出站服务（即面向核心）接口和出站本地（即面向客户）接口时，路由器建立相应的单播发送和接收计数器 为客户设备服务的服务端点。 在另一个示例中，参与L2VPN的PE路由器测量实例的服务端点的多播PDU流量，并由中间服务节点进行内部复制，以确定服务内的多播PDU丢失。
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5.发明授权公开(公告)号：US08514746B1
公开(公告)日：2013-08-20
申请号：US12941692
申请日：2010-11-08
IPC分类号： H04L12/28
CPC分类号： H04L12/462 , H04L41/0672 , H04L45/28 , H04L45/48
摘要： The reliability of the connection of a client edge (CE) device to a core network may be improved using redundant provider edge (PE) devices. A first of the PE devices may monitor a connection to the core network, where the PE device acts as a root device in a set of devices that implement a spanning tree using a spanning tree protocol and where a second PE device in the set of devices additionally connects to the core network. The PE device may additionally detect failure of the connection of the PE device to the core network; and change, in response to the detected failure of the connection, a spanning tree protocol priority value of the device to a value having a lower priority than that of the second PE device.
摘要翻译： 可以使用冗余提供商边缘（PE）设备来改进客户端（CE）设备到核心网络的连接的可靠性。 第一个PE设备可以监视与核心网络的连接，其中PE设备充当使用生成树协议实现生成树的一组设备中的根设备，并且其中设备组中的第二PE设备 另外连接到核心网络。 PE设备还可以检测PE设备到核心网的连接失败; 并且响应于检测到的连接失败，将所述设备的生成树协议优先级值改变为具有比所述第二PE设备优先级低的优先级值。
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6.发明授权E-tree service having extended shared VLAN learning across VPLS network 有权通过VPLS网络扩展共享VLAN学习的E-tree服务公开(公告)号：US08724629B1
公开(公告)日：2014-05-13
申请号：US13159213
申请日：2011-06-13
申请人： Sri Goli , Sunesh Rustagi , Pankaj Shukla
发明人： Sri Goli , Sunesh Rustagi , Pankaj Shukla
IPC分类号： H04L12/28
CPC分类号： H04L12/4625 , H04L12/4641 , H04L45/50
摘要： Techniques are described for supporting metro Ethernet “E-TREE” service over a packet-switched MPLS network, including a VPLS core, in a manner that allows a service provide to easily integrate with different types of technologies deployed by its various customers. Moreover, the techniques described herein provide increased flexibility with respect to the topology of the roots and leafs of the E-TREE service and, in particular, allow roots and leaf nodes to be coupled to a common router that provides access to the VPLS core. An NNI port of a PE router may process network traffic to provide E-TREE service to a bridged network having both leaf nodes and root nodes process and direct traffic between logical interfaces as changed next hops.
摘要翻译： 描述了通过分包交换MPLS网络（包括VPLS核心）支持城域以太网“E-TREE”服务的技术，其方式允许服务提供容易地与其各种客户部署的不同类型的技术集成。 此外，本文描述的技术提供了关于E-TREE服务的根和叶的拓扑的增加的灵活性，并且特别地，允许根和叶节点耦合到提供对VPLS核的访问的公共路由器。 PE路由器的NNI端口可以处理网络流量，以向具有叶节点和根节点的桥接网络提供E-TREE服务，并且在逻辑接口之间的直接流量改变为下一跳。
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