公开(公告)号：US20060262735A1

公开(公告)日：2006-11-23

申请号：US11135600

申请日：2005-05-23

申请人： James Guichard ,  Daniel Tappan ,  Jean-Philippe Vasseur ,  Simon Spraggs

发明人： James Guichard ,  Daniel Tappan ,  Jean-Philippe Vasseur ,  Simon Spraggs

IPC分类号： H04L12/28

CPC分类号： H04L45/507 ,  H04L12/66 ,  H04L45/04

摘要： A system and method are provided for separately distributing edge-device labels and routing information across routing areas of a computer network. Because the edge-device labels are distributed separately from network routing information, the process of distributing the edge-device labels does not preclude conventional edge-device address summarizations. Illustratively, a novel “label mapping” LSA is employed for distributing the edge-device labels across routing areas. The label-mapping LSA may be embodied as an area-scope OSPF opaque LSA (type 10) or an IS-IS LSP containing TLVs of area scope. Advantageously, the present invention is generally applicable whenever label values are allocated to edge devices in a multi-area computer network and data is “tunneled” through the network from one edge device to another.

公开(公告)号：US07483387B2

公开(公告)日：2009-01-27

申请号：US11135600

申请日：2005-05-23

申请人： James Guichard ,  Daniel C. Tappan ,  Jean-Philippe Vasseur ,  Simon Spraggs

发明人： James Guichard ,  Daniel C. Tappan ,  Jean-Philippe Vasseur ,  Simon Spraggs

IPC分类号： H04L12/26 ,  H04L12/28 ,  H04L12/56

CPC分类号： H04L45/507 ,  H04L12/66 ,  H04L45/04

摘要： A system and method are provided for separately distributing edge-device labels and routing information across routing areas of a computer network. Because the edge-device labels are distributed separately from network routing information, the process of distributing the edge-device labels does not preclude conventional edge-device address summarizations. Illustratively, a novel “label mapping” LSA is employed for distributing the edge-device labels across routing areas. The label-mapping LSA may be embodied as an area-scope OSPF opaque LSA (type 10) or an IS-IS LSP containing TLVs of area scope. Advantageously, the present invention is generally applicable whenever label values are allocated to edge devices in a multi-area computer network and data is “tunneled” through the network from one edge device to another.

摘要翻译： 提供了一种用于在计算机网络的路由区域上分开分发边缘设备标签和路由信息的系统和方法。 由于边缘设备标签与网络路由信息分开分配，因此分发边缘设备标签的过程并不排除传统的边缘设备地址摘要。 说明性地，使用新颖的“标签映射”LSA来跨越路由区域分配边缘设备标签。 标签映射LSA可以实现为区域范围的OSPF不透明LSA（类型10）或包含区域范围的TLV的IS-IS LSP。 有利地，每当标签值被分配给多区域计算机网络中的边缘设备并且数据通过网络从一个边缘设备“隧道化”到另一个边缘设备时，本发明通常是适用的。

公开(公告)号：US20060291445A1

公开(公告)日：2006-12-28

申请号：US11152523

申请日：2005-06-14

申请人： Luca Martini ,  Keyur Patel ,  Thomas Nadeau ,  James Guichard

发明人： Luca Martini ,  Keyur Patel ,  Thomas Nadeau ,  James Guichard

IPC分类号： H04L12/28

CPC分类号： H04L45/50 ,  H04L45/04

摘要： A method and computer system for auto-routing of multi-hop pseudowires is presented. A first Provider Edge (PE) device receives an advertisement from a layer 2 (L2) capable network device, the advertisement including routing state for reaching the L2 device. A first Border Gateway Protocol (BGP) table is populated with the routing state for said L2 capable network device which is reachable by way of an address family reserved for L2 end point reachability information. The first PE device advertises the first BGP table information within a first Service Provider (SP) network such that a multi-hop Pseudowire is capable of being established which includes the L2 capable device.

摘要翻译： 提出了一种用于多跳伪线自动路由的方法和计算机系统。 第一提供商边缘（PE）设备从具有层2（L2）的网络设备接收广告，该广告包括到达L2设备的路由状态。 第一个边界网关协议（BGP）表填充有可通过为L2端点可达性信息保留的地址族可达的所述L2能力网络设备的路由状态。 第一PE设备在第一服务提供商（SP）网络内通告第一BGP表信息，使得能够建立包括L2能力设备的多跳伪线。

公开(公告)号：US08751613B1

公开(公告)日：2014-06-10

申请号：US12942678

申请日：2010-11-09

申请人： Jan Medved ,  David Ward ,  James Guichard

发明人： Jan Medved ,  David Ward ,  James Guichard

IPC分类号： G06F15/177

CPC分类号： H04L45/021 ,  H04L29/12066 ,  H04L41/12 ,  H04L45/00 ,  H04L45/028 ,  H04L45/04 ,  H04L47/10 ,  H04L61/1511 ,  H04L67/1021 ,  H04L67/104

摘要： In general, techniques are described for enhancing the Application-Layer Traffic Optimization (ALTO) service to supplement network topological grouping with location-based groupings to account for endpoint mobility. For example, as described herein, an ALTO server maintains physical location information for a network of one or more endpoints that provides a service. A PID generator of the ALTO server aggregates the endpoints into a set of one or more PIDs based at least on the physical location information for the endpoints, wherein each PID is associated with a subset of the endpoints. The ALTO server generates network and cost maps for the ALTO service that include PID entries to identify a respective subset of the endpoints associated with each of the set of PIDs and cost entries that incorporate cost that reflect physical distances among endpoints.

摘要翻译： 通常，描述了用于增强应用层业务优化（ALTO）服务的技术，以基于位置分组来补充网络拓扑分组以解决端点移动性。 例如，如本文所述，ALTO服务器维护提供服务的一个或多个端点的网络的物理位置信息。 至少基于端点的物理位置信息，ALTO服务器的PID发生器将端点聚合成一组一个或多个PID，其中每个PID与端点的子集相关联。 ALTO服务器生成包含PID条目的ALTO服务的网络和成本图，以识别与该组PID中的每一个相关联的端点的相应子集以及包含反映端点之间的物理距离的成本的成本条目。

公开(公告)号：US08711838B1

公开(公告)日：2014-04-29

申请号：US13243310

申请日：2011-09-23

申请人： James Guichard ,  David Ward ,  Jan Medved ,  Maciek Konstantynowicz

发明人： James Guichard ,  David Ward ,  Jan Medved ,  Maciek Konstantynowicz

IPC分类号： H04L12/28

CPC分类号： H04L12/4633 ,  H04L12/4645

摘要： In general, techniques are described for transmitting MPLS labels over a network. More specifically, a network device such a router receives a packet to be forwarded according to a label switching protocol, such as Multi-Protocol Label Switching (MPLS). The router may determine a service instance for the packet based on a client device from which the packet originated. The network device may determine one or more services to apply to the packet based on the service instance for the packet and generate a label which having a service instance portion and a service information portion. The network device may append the label to the packet to form an MPLS-encapsulated packet, and may forward the MPLS-encapsulated packet via an output interface according to the label switching protocol.

摘要翻译： 通常，描述了通过网络传输MPLS标签的技术。 更具体地，诸如路由器的网络设备根据诸如多协议标签交换（MPLS）的标签交换协议来接收要转发的分组。 路由器可以基于从其发起分组的客户端设备来确定分组的服务实例。 网络设备可以基于分组的服务实例来确定应用于分组的一个或多个服务，并且生成具有服务实例部分和服务信息部分的标签。 网络设备可以将标签附加到分组，形成MPLS封装的分组，并且可以根据标签交换协议经由输出接口转发MPLS封装的分组。

公开(公告)号：US20130343174A1

公开(公告)日：2013-12-26

申请号：US13533961

申请日：2012-06-26

申请人： James Guichard ,  David Ward

发明人： James Guichard ,  David Ward

IPC分类号： H04L12/24 ,  H04L12/26

CPC分类号： H04L45/28 ,  H04L41/0659 ,  H04L41/5025 ,  H04L45/22

摘要： Techniques are described for detecting failure or degradation of a service enabling technology function independent from an operational state of a service node hosting the service enabling technology function. For example, a service node may provide one or more service enabling technology functions, and service engineered paths may be traffic-engineered through a network to service node network devices that host a service enabling technology function. A monitor component at the service layer of the service node can detect failure or degradation of one or more service enabling technology functions provided by the service node. The monitor component reports detection of failure or degradation to a fault detection network protocol in a forwarding plane of the service node. The fault detection network protocol communicates with an ingress router of a service engineered path to trigger fast reroute by the ingress of traffic flows to bypass the affected service enabling technology function.

摘要翻译： 描述了用于检测服务使能技术功能的独立于承载服务使能技术功能的服务节点的操作状态的故障或劣化的技术。 例如，服务节点可以提供一个或多个服务启用技术功能，并且服务设计路径可以通过网络进行业务量设计，以服务承载服务使能技术功能的节点网络设备。 服务节点的服务层的监视器组件可以检测由服务节点提供的一个或多个服务使能技术功能的故障或劣化。 监视器组件报告在服务节点的转发平面中检测到故障检测网络协议的故障或劣化。 故障检测网络协议与服务工程路由的入口路由器进行通信，通过流量流入引发快速重路由，绕过受影响的业务使能技术功能。

公开(公告)号：US09088519B2

公开(公告)日：2015-07-21

申请号：US13525073

申请日：2012-06-15

申请人： James Guichard ,  David Ward ,  Jan Medved ,  Maciek Konstantynowicz

发明人： James Guichard ,  David Ward ,  Jan Medved ,  Maciek Konstantynowicz

IPC分类号： H04L12/723 ,  H04L12/46

CPC分类号： H04L45/50 ,  H04L12/4645 ,  H04L45/507

摘要： In one example, a network device receives a packet to be forwarded according to a label switching protocol, determines a service to be performed on the packet by a service network device, sends a label request message to the service network device, wherein the label request message indicates support for labels having a particular length, wherein the particular length is larger than twenty bits (e.g., forty bits), and wherein the label request message specifies the service to be performed on the packet, receives, in response to the label request message, a label mapping message defining a label of the particular length, appends the label to the packet to form a Multi-Protocol Label Switching (MPLS)-encapsulated packet, and forwards the MPLS-encapsulated packet according to the label switching protocol.

摘要翻译： 在一个示例中，网络设备根据标签交换协议接收要转发的分组，由服务网络设备确定要在分组上执行的服务，向服务网络设备发送标签请求消息，其中标签请求 消息指示对具有特定长度的标签的支持，其中特定长度大于二十位（例如，四十位），并且其中标签请求消息指定要对分组执行的服务，响应于标签请求而接收 消息，定义特定长度的标签的标签映射消息，将标签附加到分组以形成多协议标签交换（MPLS）封装的分组，并根据标签交换协议转发MPLS封装的分组。

公开(公告)号：US09143557B2

公开(公告)日：2015-09-22

申请号：US13534121

申请日：2012-06-27

申请人： James Guichard ,  David Ward ,  Jan Medved ,  Maciek Konstantynowicz

发明人： James Guichard ,  David Ward ,  Jan Medved ,  Maciek Konstantynowicz

IPC分类号： H04L12/28 ,  H04L29/08

CPC分类号： H04L67/1008 ,  H04L67/1025 ,  H04L67/1029 ,  H04L67/16 ,  H04L67/327

摘要： In general, techniques are described for providing feedback loops for service engineered paths. A service node comprising an interface and a control unit may implement the techniques. The interface receives traffic via a path configured within a network to direct the traffic from an ingress network device of the path to the service node. The control unit applies one or more services to the traffic received via the path and generates service-specific information related to the application of the one or more services to the traffic. The interface then sends the service-specific information to at least one network device configured to forward the traffic via the path so that the at least one network device configured to forward the traffic via the path is able to adapt the path based on the service-specific information.

摘要翻译： 通常，描述了为服务工程路径提供反馈回路的技术。 包括接口和控制单元的服务节点可以实现这些技术。 该接口通过网络中配置的路径接收流量，将流量从路由入口网络设备引导到业务节点。 控制单元将一个或多个服务应用于经由路径接收到的业务，并且生成与该业务相关的一个或多个业务的应用相关的业务特定信息。 接口然后将服务特定信息发送到被配置为经由路径转发流量的至少一个网络设备，使得配置成经由路径转发流量的至少一个网络设备能够基于服务 - 具体信息。

公开(公告)号：US08948001B2

公开(公告)日：2015-02-03

申请号：US13533961

申请日：2012-06-26

申请人： James Guichard ,  David Ward

发明人： James Guichard ,  David Ward

IPC分类号： H04L12/22 ,  H04L12/24 ,  H04L12/26

CPC分类号： H04L45/28 ,  H04L41/0659 ,  H04L41/5025 ,  H04L45/22

摘要： Techniques are described for detecting failure or degradation of a service enabling technology function independent from an operational state of a service node hosting the service enabling technology function. For example, a service node may provide one or more service enabling technology functions, and service engineered paths may be traffic-engineered through a network to service node network devices that host a service enabling technology function. A monitor component at the service layer of the service node can detect failure or degradation of one or more service enabling technology functions provided by the service node. The monitor component reports detection of failure or degradation to a fault detection network protocol in a forwarding plane of the service node. The fault detection network protocol communicates with an ingress router of a service engineered path to trigger fast reroute by the ingress of traffic flows to bypass the affected service enabling technology function.

摘要翻译： 描述了用于检测服务使能技术功能的独立于承载服务使能技术功能的服务节点的操作状态的故障或劣化的技术。 例如，服务节点可以提供一个或多个服务启用技术功能，并且服务设计路径可以通过网络进行业务量设计，以服务承载服务使能技术功能的节点网络设备。 服务节点的服务层的监视器组件可以检测由服务节点提供的一个或多个服务使能技术功能的故障或劣化。 监视器组件报告在服务节点的转发平面中检测到故障检测网络协议的故障或劣化。 故障检测网络协议与服务工程路由的入口路由器进行通信，通过流量流入引发快速重路由，绕过受影响的业务使能技术功能。

公开(公告)号：US20140003232A1

公开(公告)日：2014-01-02

申请号：US13534121

申请日：2012-06-27

申请人： James Guichard ,  David Ward ,  Jan Medved ,  Maciek Konstantynowicz

发明人： James Guichard ,  David Ward ,  Jan Medved ,  Maciek Konstantynowicz

IPC分类号： H04L12/24 ,  H04L12/56

CPC分类号： H04L67/1008 ,  H04L67/1025 ,  H04L67/1029 ,  H04L67/16 ,  H04L67/327

摘要： In general, techniques are described for providing feedback loops for service engineered paths. A service node comprising an interface and a control unit may implement the techniques. The interface receives traffic via a path configured within a network to direct the traffic from an ingress network device of the path to the service node. The control unit applies one or more services to the traffic received via the path and generates service-specific information related to the application of the one or more services to the traffic. The interface then sends the service-specific information to at least one network device configured to forward the traffic via the path so that the at least one network device configured to forward the traffic via the path is able to adapt the path based on the service-specific information.

摘要翻译： 通常，描述了为服务工程路径提供反馈回路的技术。 包括接口和控制单元的服务节点可以实现这些技术。 该接口通过网络中配置的路径接收流量，将流量从路由入口网络设备引导到业务节点。 控制单元将一个或多个服务应用于经由路径接收到的业务，并且生成与该业务相关的一个或多个业务的应用相关的业务特定信息。 接口然后将服务特定信息发送到被配置为经由路径转发流量的至少一个网络设备，使得配置成经由路径转发流量的至少一个网络设备能够基于服务 - 具体信息。