公开(公告)号：US20130322236A1

公开(公告)日：2013-12-05

申请号：US13482441

申请日：2012-05-29

Applicant: Nitin Bahadur ,  David Ward

Inventor： Nitin Bahadur ,  David Ward

IPC: H04L12/24 ,  H04L12/26

CPC classification number: H04L12/4633 ,  H04L43/0811 ,  H04L45/04 ,  H04L45/68 ,  H04L47/12 ,  H04L47/17 ,  H04L47/26 ,  H04L47/29

Abstract: In general, techniques are described for mapping WAN conditions to appropriate back-pressure mechanisms at the WAN edges to improve the performance of delay and/or loss-sensitive applications. In one example, a system includes a wide area network having a provider edge (PE) router to establish a Fibre Channel over Ethernet (FCoE) pseudowire over the wide area network. A Lossless Ethernet network attaches, by an attachment circuit, to the FCoE pseudowire at the PE router. A Fibre Channel Fabric connects to the Lossless Ethernet network and to a storage device that provides data for transmission over the wide area network by the FCoE pseudowire. The PE router detects a defect in the FCoE pseudowire and, in response to detecting the defect in FCoE pseudowire, injects an FCoE flow control extension into the Lossless Ethernet network by the attachment circuit.

Abstract translation: 通常，描述了将WAN条件映射到WAN边缘处的适当背压机制的技术，以改善延迟和/或丢失敏感应用的性能。 在一个示例中，系统包括具有提供商边缘（PE）路由器以在广域网上建立以太网光纤通道（FCoE）伪线的广域网。 无损以太网通过附件电路连接到PE路由器上的FCoE伪线。 光纤通道结构连接到无损以太网网络，并连接到通过FCoE伪线提供广域网传输数据的存储设备。 PE路由器检测FCoE伪线中的缺陷，并且响应于检测到FCoE伪线中的缺陷，通过附件电路将FCoE流控制扩展注入到无损以太网中。

公开(公告)号：US08897128B2

公开(公告)日：2014-11-25

申请号：US13482441

申请日：2012-05-29

Applicant: Nitin Bahadur ,  David Ward

Inventor： Nitin Bahadur ,  David Ward

IPC: H04L12/26

CPC classification number: H04L12/4633 ,  H04L43/0811 ,  H04L45/04 ,  H04L45/68 ,  H04L47/12 ,  H04L47/17 ,  H04L47/26 ,  H04L47/29

Abstract: In general, techniques are described for mapping WAN conditions to appropriate back-pressure mechanisms at the WAN edges to improve the performance of delay and/or loss-sensitive applications. In one example, a system includes a wide area network having a provider edge (PE) router to establish a Fiber Channel over Ethernet (FCoE) pseudowire over the wide area network. A Lossless Ethernet network attaches, by an attachment circuit, to the FCoE pseudowire at the PE router. A Fiber Channel Fabric connects to the Lossless Ethernet network and to a storage device that provides data for transmission over the wide area network by the FCoE pseudowire. The PE router detects a defect in the FCoE pseudowire and, in response to detecting the defect in FCoE pseudowire, injects an FCoE flow control extension into the Lossless Ethernet network by the attachment circuit.

Abstract translation: 通常，描述了将WAN条件映射到WAN边缘处的适当背压机制的技术，以改善延迟和/或丢失敏感应用的性能。 在一个示例中，系统包括具有提供商边缘（PE）路由器以在广域网上建立以太网光纤通道（FCoE）伪线的广域网。 无损以太网通过附件电路连接到PE路由器上的FCoE伪线。 光纤通道结构连接到无损以太网网络，并连接到通过FCoE伪线提供广域网传输数据的存储设备。 PE路由器检测FCoE伪线中的缺陷，并且响应于检测到FCoE伪线中的缺陷，通过附件电路将FCoE流控制扩展注入到无损以太网中。

公开(公告)号：US08804736B1

公开(公告)日：2014-08-12

申请号：US13243450

申请日：2011-09-23

Applicant: John E. Drake ,  Rahul Aggarwal ,  Nitin Bahadur ,  Nischal Sheth

Inventor： John E. Drake ,  Rahul Aggarwal ,  Nitin Bahadur ,  Nischal Sheth

IPC: H04L12/28

CPC classification number: H04L12/4633 ,  H04L12/462 ,  H04L12/465

Abstract: An ingress router of a provider network receives a packet from a customer network, determines that the packet includes a customer network label and that the packet is to be tunneled through the provider network, based on the determination, adds a delimiter label to the packet indicative of a bottom of a provider network label stack and one or more provider network labels to the packet, and forwards the packet to a next routing device along the provider network tunnel. An egress routing device of the provider network receives a packet comprising a provider network label stack, removes the provider network label stack from the packet, determines whether the packet comprises a delimiter label following the provider network label stack, and, when the packet comprises the delimiter label, forwards the packet to a customer network interface device.

Abstract translation: 供应商网络的入口路由器从客户网络接收分组，基于该确定，确定分组包括客户网络标签并且分组将被穿过提供商网络，将分隔符标签添加到分组指示 提供商网络标签堆叠的底部和一个或多个提供商网络标签，并且将分组沿着提供商网络隧道转发到下一个路由设备。 提供商网络的出口路由设备接收包括提供商网络标签堆栈的分组，从分组中移除提供商网络标签栈，确定分组是否包括在提供商网络标签栈之后的分隔符标签，并且当分组包括 分隔符标签，将数据包转发到客户网络接口设备。

公开(公告)号：US08472346B1

公开(公告)日：2013-06-25

申请号：US13103838

申请日：2011-05-09

Applicant: Nitin Bahadur ,  Kireeti Kompella

Inventor： Nitin Bahadur ,  Kireeti Kompella

IPC: H04L12/56

CPC classification number: H04L45/28 ,  H04L43/0811 ,  H04L43/10 ,  H04L45/00 ,  H04L45/50 ,  H04L47/10 ,  H04L49/555

Abstract: In general, principles of the invention relate to techniques for detecting data plane failures in Multi-Protocol Label Switching (MPLS) Label-Switched Paths (LSPs) that may be tunneled over one or more other LSPs. More specifically, the techniques described herein allow for testing connectivity of an LSP that is tunneled through at least one other LSP, and testing connectivity of an inter-autonomous system LSP. For example, a method comprises providing, with an intermediate label-switching router (LSR) of an LSP, instructions to an ingress LSR of the LSP to modify a forwarding equivalence class (FEC) stack of MPLS echo request packets. The intermediate LSR may provide the instructions within an MPLS echo reply packet.

Abstract translation: 一般来说，本发明的原理涉及用于检测可能在一个或多个其他LSP上隧道传输的多协议标签交换（MPLS）标签交换路径（LSP）中的数据平面故障的技术。 更具体地，本文描述的技术允许测试通过至少一个其他LSP隧道传输的LSP的连通性，以及测试自主自主系统LSP的连通性。 例如，一种方法包括向LSP的中间标签交换路由器（LSR）提供对LSP的入口LSR的指令，以修改MPLS回显请求分组的转发等价类（FEC）堆栈。 中间LSR可以在MPLS回应应答分组内提供指令。

公开(公告)号：US08634418B2

公开(公告)日：2014-01-21

申请号：US13174962

申请日：2011-07-01

Applicant: Ambrose Kwong ,  Nischal Sheth ,  Hannes Gredler ,  Nitin Bahadur ,  Harish Sitaraman ,  Avneesh Sachdev

Inventor： Ambrose Kwong ,  Nischal Sheth ,  Hannes Gredler ,  Nitin Bahadur ,  Harish Sitaraman ,  Avneesh Sachdev

IPC: H04L12/28

CPC classification number: H04L45/245 ,  H04L45/02 ,  H04L45/50 ,  Y02D50/30

Abstract: In general, techniques are described for providing extended administrative groups in networks. A network device comprising an interface and a control unit may implement the techniques. The interface receives a routing protocol message that advertises a link. This message includes a field for storing first data associated with the link in accordance with the routing protocol. The field is defined by the routing protocol as a field having a different function from an administrative group field defined by the same routing protocol. The control unit determines that this field has been repurposed to store second data, wherein this second data specifies an extended administrative group for the link different from those that may be specified by the administrative group field. The control unit then updates routing information to associate the advertised link with the extended administrative group and performs path selection to select paths based on the updated routing information.

Abstract translation: 一般来说，描述了在网络中提供扩展管理组的技术。 包括接口和控制单元的网络设备可以实现这些技术。 接口接收通告链路的路由协议消息。 该消息包括用于根据路由协议存储与链路相关联的第一数据的字段。 该字段由路由协议定义为具有与由相同路由协议定义的管理组字段不同的功能的字段。 控制单元确定该字段已被重新利用以存储第二数据，其中该第二数据指定用于该链接的扩展管理组，其不同于可由管理组字段指定的那些。 然后，控制单元更新路由信息以将通告的链路与扩展管理组相关联，并且基于更新的路由信息​​执行路径选择以选择路径。

公开(公告)号：US20130003728A1

公开(公告)日：2013-01-03

申请号：US13174962

申请日：2011-07-01

Applicant: Ambrose Kwong ,  Nischal Sheth ,  Hannes Gredler ,  Nitin Bahadur ,  Harish Sitaraman ,  Avneesh Sachdev

Inventor： Ambrose Kwong ,  Nischal Sheth ,  Hannes Gredler ,  Nitin Bahadur ,  Harish Sitaraman ,  Avneesh Sachdev

IPC: H04L12/56

CPC classification number: H04L45/245 ,  H04L45/02 ,  H04L45/50 ,  Y02D50/30

Abstract: In general, techniques are described for providing extended administrative groups in networks. A network device comprising an interface and a control unit may implement the techniques. The interface receives a routing protocol message that advertises a link. This message includes a field for storing first data associated with the link in accordance with the routing protocol. The field is defined by the routing protocol as a field having a different function from an administrative group field defined by the same routing protocol. The control unit determines that this field has been repurposed to store second data, wherein this second data specifies an extended administrative group for the link different from those that may be specified by the administrative group field. The control unit then updates routing information to associate the advertised link with the extended administrative group and performs path selection to select paths based on the updated routing information.

Abstract translation: 一般来说，描述了在网络中提供扩展管理组的技术。 包括接口和控制单元的网络设备可以实现这些技术。 接口接收通告链路的路由协议消息。 该消息包括用于根据路由协议存储与链路相关联的第一数据的字段。 该字段由路由协议定义为具有与由相同路由协议定义的管理组字段不同的功能的字段。 控制单元确定该字段已被重新利用以存储第二数据，其中该第二数据指定用于该链接的扩展管理组，其不同于可由管理组字段指定的那些。 然后，控制单元更新路由信息以将通告的链路与扩展管理组相关联，并且基于更新的路由信息​​执行路径选择以选择路径。

公开(公告)号：US09923798B1

公开(公告)日：2018-03-20

申请号：US13536757

申请日：2012-06-28

Applicant: Nitin Bahadur ,  Kireeti Kompella

Inventor： Nitin Bahadur ,  Kireeti Kompella

IPC: H04L12/701

CPC classification number: H04L45/00

Abstract: Techniques are describe for establishing an overall label switched path (LSP) for dynamic load balancing of network traffic being sent across a network using the a resource reservation protocol such as Resource Reservation Protocol with Traffic Engineering (RSVP-TE). The tunnel may be a single RSVP-TE Label Switched Path (LSP) that is configured to automatically and dynamically load balance network traffic across different sub-paths of the RSVP-TE LSP over the network. The ingress device of the overall multi-path LSP can analyze traffic statistics to determine when a network traffic demand differs from a currently reserved bandwidth of the overall multi-path LSP by at least a threshold amount, and can automatically add or remove a sub-path from the overall multi-path LSP to adjust capacity of the overall multi-path LSP to correspond to the currently reserved bandwidth.

公开(公告)号：US07957330B1

公开(公告)日：2011-06-07

申请号：US11945809

申请日：2007-11-27

Applicant: Nitin Bahadur ,  David M. Katz ,  Nischal Sheth ,  Rahul Aggarwal

Inventor： Nitin Bahadur ,  David M. Katz ,  Nischal Sheth ,  Rahul Aggarwal

IPC: H04B1/44

CPC classification number: H04L41/082

Abstract: The invention is directed to techniques for failsafe management of periodic communications between network devices. A first network device, for example, establishes with a second network device a first response interval by which the first device responds to a message received from the second device. Prior to commencing a software upgrade, the first device determines whether the event requires an interval of time during which the first device cannot respond to the message within the established first response interval. Based on the determination and prior to commencing the upgrade, the first device establishes with the second device a second response interval that equals or exceeds the first response interval. Upon completion of the event, the first device establishes with the second device a third response interval. The first network device therefore may automatically adjust response intervals to accommodate upgrades that may cause unnecessary thrashing.

Abstract translation: 本发明涉及用于网络设备之间的周期性通信的故障安全管理的技术。 例如，第一网络设备与第二网络设备建立第一响应间隔，第一设备通过该第一响应间隔响应从第二设备接收的消息。 在开始软件升级之前，第一设备确定该事件是否需要在建立的第一响应间隔期间第一设备不能响应消息的时间间隔。 基于确定并且在开始升级之前，第一设备与第二设备建立等于或超过第一响应间隔的第二响应间隔。 在事件完成时，第一设备与第二设备建立第三响应间隔。 因此，第一网络设备可以自动调整响应间隔以适应可能引起不必要的颠簸的升级。

公开(公告)号：US08799509B2

公开(公告)日：2014-08-05

申请号：US13071146

申请日：2011-03-24

Applicant: Kireeti Kompella ,  Nitin Bahadur

Inventor： Kireeti Kompella ,  Nitin Bahadur

IPC: G06F15/173 ,  H04L12/28

CPC classification number: H04L43/0811 ,  H04L43/10 ,  H04L45/22 ,  H04L45/28 ,  H04L45/50

Abstract: A method performed by a network device may include assembling a multiprotocol label switching (MPLS) echo request, the echo request including an instruction for a transit node to forward the echo request via a bypass path associated with the transit node, and an instruction for an egress node to send an echo reply indicating that the echo request was received on the bypass path. The method may also include sending the MPLS echo request over a functioning label switched path (LSP).

Abstract translation: 由网络设备执行的方法可以包括组合多协议标签交换（MPLS）回波请求，所述回应请求包括用于传输节点的指令，以经由与所述传输节点相关联的旁路路径来转发所述回声请求，以及用于 出口节点发送回应应答，指示在旁路路径上接收到回应请求。 该方法还可以包括通过功能标签交换路径（LSP）发送MPLS回应请求。

公开(公告)号：US08189579B1

公开(公告)日：2012-05-29

申请号：US12771169

申请日：2010-04-30

Applicant: Umesh Krishnaswamy ,  Nitin Bahadur ,  Rahul Aggarwal

Inventor： Umesh Krishnaswamy ,  Nitin Bahadur ,  Rahul Aggarwal

IPC: H04L12/28 ,  H04L12/56

CPC classification number: H04L45/00 ,  H04L45/28 ,  H04L45/58 ,  H04L45/60

Abstract: Techniques are described for configuration of a multi-chassis router for managing periodic communications between the multi-chassis router and other network devices. The multi-chassis router selectively processes data received from a network by determine whether the data: (1) indicates an operational state of a network device in association with a routing protocol, or (2) conveys routing information for the routing protocol. Data conveying routing information are processed by a master routing component of the multi-chassis router, while data indicating an operational state of a network device are processed by one or more slave routing components of the multi-chassis router. The techniques also allow the multi-chassis router to allocate responsibility for managing periodic communications for the set of routing protocols among a plurality of hierarchically arranged cooperative routing components within the multi-chassis router, such as switch card chassis, line card chassis, or interface cards within each line card chassis.

Abstract translation: 描述了用于配置用于管理多机架路由器和其他网络设备之间的周期性通信的多机架路由器的技术。 多机架路由器通过确定数据是否有选择地处理从网络接收的数据：（1）指示与路由协议相关联的网络设备的操作状态，或者（2）传送用于路由协议的路由信息​​。 数据传送路由信息由多机架路由器的主路由部件处理，而指示网络设备的操作状态的数据由多机架路由器的一个或多个从属路由组件处理。 这些技术还允许多机架路由器分配负责管理多机架路由器内的多个分层布置的协作路由组件中的路由协议集合的周期性通信，诸如交换机卡机箱，线路卡机箱或接口 每个线卡机箱内的卡。