公开(公告)号：US10182000B2

公开(公告)日：2019-01-15

申请号：US15227721

申请日：2016-08-03

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Tarek Saad ,  Clarence Filsfils ,  Muthurajah Sivabalan

IPC: H04L12/707 ,  H04L12/24 ,  H04L12/701 ,  H04L12/751 ,  H04L12/717 ,  H04L12/721 ,  H04L12/46 ,  H04L12/815

Abstract: A method is described and in one embodiment includes receiving a packet of a traffic flow at an ingress node of a communications network; routing the packet to an egress node of the communications network via a first path comprising a tunnel if the packet was received from a node external to the communications network; and routing the packet to the egress node of the communications network via a second path that does not traverse the tunnel if the packet was received from a node internal to the communications network. The first path is identified by a first Forwarding Information Base (“FIB”) entry corresponding to the flow and the second path is identified by a second FIB entry corresponding to the flow.

公开(公告)号：US20180041420A1

公开(公告)日：2018-02-08

申请号：US15227721

申请日：2016-08-03

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Tarek Saad ,  Clarence Filsfils ,  Muthurajah Sivabalan

IPC: H04L12/707 ,  H04L12/46 ,  H04L12/815 ,  H04L12/721

CPC classification number: H04L45/22 ,  H04L12/4633 ,  H04L45/12 ,  H04L47/22

Abstract: A method is described and in one embodiment includes receiving a packet of a traffic flow at an ingress node of a communications network; routing the packet to an egress node of the communications network via a first path comprising a tunnel if the packet was received from a node external to the communications network; and routing the packet to the egress node of the communications network via a second path that does not traverse the tunnel if the packet was received from a node internal to the communications network. The first path is identified by a first Forwarding Information Base (“FIB”) entry corresponding to the flow and the second path is identified by a second FIB entry corresponding to the flow.

公开(公告)号：US09699087B2

公开(公告)日：2017-07-04

申请号：US14229503

申请日：2014-03-28

Applicant: Cisco Technology, Inc.

Inventor： Sami Boutros ,  Muthurajah Sivabalan ,  David D. Ward ,  Stefano B. Previdi ,  Jean-Philippe Vasseur ,  Rodolphe Figaro ,  Reshad A. Rahman

IPC: H04L12/803 ,  H04L12/24 ,  H04L12/701 ,  H04L12/723 ,  H04L12/851 ,  H04L12/911

CPC classification number: H04L47/125 ,  H04L41/06 ,  H04L45/00 ,  H04L45/50 ,  H04L47/2408 ,  H04L47/745

Abstract: A system and method for advertising out-of-resources (OOR) conditions for entities, such as nodes, line cards and data links, in a manner that does not involve using a maximum cost to indicate the entity is “out-of-resources.” According to the technique, an OOR condition for an entity is advertised in one or more type-length-value (TLV) objects contained in an advertisement message. The advertisement message is flooded to nodes on a data network to inform them of the entity's OOR condition. Head-end nodes that process the advertisement message may use information contained in the TLV object to determine a path for a new label switched path (LSP) that does not include the entity associated with the OOR condition.

公开(公告)号：US09647929B2

公开(公告)日：2017-05-09

申请号：US14309338

申请日：2014-06-19

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Santiago Alvarez ,  Muthurajah Sivabalan

IPC: H04L12/721 ,  H04L12/24 ,  H04L12/913 ,  H04L12/26

CPC classification number: H04L45/123 ,  H04L41/0803 ,  H04L43/062 ,  H04L45/124 ,  H04L45/30 ,  H04L47/724

Abstract: Methods and systems are disclosed for enabling centralized path definition and policy with distributed path setup, and centralized path setup control with distributed path utilization constraints. In one example, a path computation client (PCC) requests, utilizing opaque PCE profile identifiers, path computation from a path computation element (PCE). The PCE profile identifier corresponds to path computation constraints, stored local to PCE, and are unknown to the PCC. Advantageously, the PCE profile identifiers allow the PCC to initiate path computation requests based on information local the PCC while leveraging centralized computation by the PCE. In another example, a PCE requests, utilizing opaque PCC profile identifiers, that a PCC initiate a path. The PCC profile identifier corresponds to path usage constraints, stored local to PCC, and are unknown to the PCE. Advantageously, the PCC identifiers allow the PCE to marshal path initiation while leveraging distributed resources to enforce compliance with usage parameters.

公开(公告)号：US20170064717A1

公开(公告)日：2017-03-02

申请号：US15244735

申请日：2016-08-23

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Clarence Filsfils ,  Muthurajah Sivabalan ,  Stefano B. Previdi ,  Tarek Saad

IPC: H04W72/04 ,  H04L12/24 ,  H04L12/723 ,  H04L29/06 ,  H04L12/801 ,  H04L29/12

CPC classification number: H04L69/22 ,  H04L41/5051 ,  H04L41/5077 ,  H04L45/50 ,  H04L47/17 ,  H04W88/12 ,  H04W88/16

Abstract: Utilizing the systems disclosed herein, a network element (in a network) controls, within another network, the constraints of a service, timing of the creation of the service, and selection a service on which a packet is transmitted. For example, a first network element (located in a first network) receives a request associated with initiating a service. The request is received from a second network element located in a second network and includes at least one path constraint. The first network element controls creation of the service in the first network on behalf of the second network element located in the second network by, e.g., identifying a path based, at least in part, on the at least one path constraint; and binding an identifier and an interface to the path, wherein the interface is associated with one or more operation to perform on any traffic that is labeled with the identifier.

Abstract translation: 利用本文公开的系统，网络元件（在网络中）在另一个网络内控制服务的约束，创建服务的定时，以及选择其上传送分组的服务。 例如，第一网络元件（位于第一网络中）接收与启动服务相关联的请求。 从位于第二网络中的第二网络单元接收该请求，并且包括至少一个路径约束。 第一网络元件至少部分地基于至少一个路径约束来控制代表位于第二网络中的第二网络元件在第一网络中创建服务，例如，基于路径; 以及将标识符和接口绑定到所述路径，其中所述接口与对标识有所述标识符的任何业务执行的一个或多个操作相关联。

公开(公告)号：US20170048138A1

公开(公告)日：2017-02-16

申请号：US15337976

申请日：2016-10-28

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Muthurajah Sivabalan ,  Sami Boutros ,  Clarence Filsfils ,  Rex Emmanuel Fernando ,  Lakshmi Sharma ,  Santiago Vazquez Freitas ,  Bruce McDougall ,  Robert Keith Fielding

IPC: H04L12/723 ,  H04L29/12 ,  H04L12/911

CPC classification number: H04L45/50 ,  H04L47/825 ,  H04L61/2007

Abstract: A method is provided in one example embodiment and includes receiving a request to create a path through a network, wherein the path originates on a first network device and terminates on the second network device; identifying a first controller associated with the first network device, wherein the first controller proxies control plane functions for the first network device; identifying a second controller associated with the second network device, wherein the second controller proxies control plane functions for the second network device; and computing the path using the first controller as a source and the second controller as a destination. The first controller installs the computed path on the first network device and the second controller installs the computed path on the second network device.

Abstract translation: 在一个示例性实施例中提供了一种方法，并且包括接收通过网络创建路径的请求，其中所述路径起始于第一网络设备并终止于所述第二网络设备上; 识别与所述第一网络设备相关联的第一控制器，其中所述第一控制器代理所述第一网络设备的控制平面功能; 识别与所述第二网络设备相关联的第二控制器，其中所述第二控制器代理所述第二网络设备的控制平面功能; 以及使用第一控制器作为源并且将第二控制器作为目的地来计算路径。 第一个控制器在第一个网络设备上安装计算的路径，第二个控制器将计算的路径安装在第二个网络设备上。

公开(公告)号：US20160373317A1

公开(公告)日：2016-12-22

申请号：US15234212

申请日：2016-08-11

Applicant: Cisco Technology, Inc.

Inventor： Zafar Ali ,  Muthurajah Sivabalan ,  Clarence Filsfils ,  Jan Medved

IPC: H04L12/24 ,  H04L12/911 ,  H04L12/26

CPC classification number: H04L41/5051 ,  H04L41/0896 ,  H04L43/0876 ,  H04L47/825

Abstract: Bandwidth usage for an existing communication tunnel between a first device and second device is monitored. A determination is made that additional bandwidth is required for communication between the first network device and the second network device. A determination is made that for the addition of the additional bandwidth would exceed available bandwidth for the existing tunnel. Additional bandwidth is established between the first network device and the second network device.

Abstract translation: 监视第一设备和第二设备之间现有通信隧道的带宽使用情况。 确定第一网络设备和第二网络设备之间的通信需要额外的带宽。 确定附加带宽的增加将超过现有隧道的可用带宽。 在第一网络设备和第二网络设备之间建立额外的带宽。

公开(公告)号：US09450858B2

公开(公告)日：2016-09-20

申请号：US14067023

申请日：2013-10-30

Applicant: Cisco Technology, Inc.

Inventor： Tarek Saad ,  Muthurajah Sivabalan ,  Rakesh Gandhi

IPC: H04L12/721 ,  H04L12/911 ,  H04L12/729 ,  H04L12/735 ,  H04L12/707

CPC classification number: H04L45/125 ,  H04L45/1283 ,  H04L45/22

Abstract: At a first network device, a plurality of paths through a network from a source network device to a destination network device are determined. A vacant bandwidth is calculated for each of the plurality of paths. A primary path is selected from the plurality of paths based on the vacant bandwidth, and a standby path is selected from the plurality of paths based on the vacant bandwidth.

Abstract translation: 在第一网络设备中，确定通过网络从源网络设备到目的地网络设备的多条路径。 为多个路径中的每一个计算空闲带宽。 基于空闲带宽从多个路径选择主路径，并且基于空闲带宽从多个路径中选择备用路径。

公开(公告)号：US09313145B2

公开(公告)日：2016-04-12

申请号：US14735971

申请日：2015-06-10

Applicant: Cisco Technology, Inc.

Inventor： Rakesh Gandhi ,  Muthurajah Sivabalan

IPC: H04L12/913 ,  H04L12/46 ,  H04L12/721 ,  H04L12/723 ,  H04L12/911

CPC classification number: H04L47/724 ,  H04L12/4633 ,  H04L45/36 ,  H04L45/50 ,  H04L47/825

Abstract: Particular embodiments may enable setup and signaling of co-routed and non co-routed label switched paths (LSPs) of a bidirectional packet traffic engineering (TE) tunnel in an unambiguous manner with respect to provisioning of the LSPs/tunnel. A head-end node may set up the bidirectional packet TE tunnel by computing a forward (and possibly a reverse) direction LSP, and then signal the bidirectional TE tunnel utilizing, e.g., extensions to an associated Resource Reservation Protocol (RSVP) signaling method. The extensions to the associated RSVP signaling method include a plurality of additional Association Types of an Extended Association object carried in a RSVP Path message transmitted by the head-end node to the tail-end node over the forward direction LSP, wherein the additional Association Types explicitly identify the provisioning of the forward and reverse direction LSPs as co-routed or non co-routed.

公开(公告)号：US20150281115A1

公开(公告)日：2015-10-01

申请号：US14735971

申请日：2015-06-10

Applicant: Cisco Technology, Inc.

Inventor： Rakesh Gandhi ,  Muthurajah Sivabalan

IPC: H04L12/913 ,  H04L12/911 ,  H04L12/721 ,  H04L12/723

CPC classification number: H04L47/724 ,  H04L12/4633 ,  H04L45/36 ,  H04L45/50 ,  H04L47/825

Abstract: Particular embodiments may enable setup and signaling of co-routed and non co-routed label switched paths (LSPs) of a bidirectional packet traffic engineering (TE) tunnel in an unambiguous manner with respect to provisioning of the LSPs/tunnel. A head-end node may set up the bidirectional packet TE tunnel by computing a forward (and possibly a reverse) direction LSP, and then signal the bidirectional TE tunnel utilizing, e.g., extensions to an associated Resource Reservation Protocol (RSVP) signaling method. The extensions to the associated RSVP signaling method include a plurality of additional Association Types of an Extended Association object carried in a RSVP Path message transmitted by the head-end node to the tail-end node over the forward direction LSP, wherein the additional Association Types explicitly identify the provisioning of the forward and reverse direction LSPs as co-routed or non co-routed.

Abstract translation: 具体实施例可以使得能够以相对于LSP /隧道的提供的明确方式建立和发送双向分组流量工程（TE）隧道的共路由和非共路由标签交换路径（LSP）。 前端节点可以通过计算前向（可能是反向）LSP来建立双向分组TE隧道，然后利用例如关联的资源预留协议（RSVP）信令方法的扩展来向双向TE隧道发信号。 相关RSVP信令方法的扩展包括由前端节点通过前向LSP发送到尾端节点的RSVP路径消息中携带的扩展关联对象的多个附加关联类型，其中附加关联类型 明确地将前向和反向LSP的配置标识为共路由或非共路由。