公开(公告)号：US20140317259A1

公开(公告)日：2014-10-23

申请号：US14205245

申请日：2014-03-11

Applicant: Cisco Technology, Inc.

Inventor： Stefano B. Previdi ,  Clarence Filsfils ,  Ahmed R. Bashandy ,  David D. Ward

IPC: H04L29/12

CPC classification number: H04L61/30 ,  H04L45/02 ,  H04L45/34 ,  H04L45/38 ,  H04L45/42 ,  H04L45/44 ,  H04L45/50

Abstract: Various techniques can be used to advertise adjacency segment identifiers (IDs) within a segment routing (SR) network. For example, a method, performed by a first node, can involve identifying an adjacency segment between a first node and a second node; assigning an identifier to the adjacency segment; and sending an Intermediate-System-to-Intermediate-System (IS-IS) hello (IIH) message to another node. The adjacency advertisement includes the identifier. If the adjacency segment is part of a LAN, the IIH message can be sent to a designated node that aggregates adjacency segment ID advertisements for the other nodes on the LAN.

Abstract translation: 可以使用各种技术来在段路由（SR）网络中通告相邻段标识符（ID）。 例如，由第一节点执行的方法可以涉及识别第一节点和第二节点之间的邻接段; 将标识符分配给邻接段; 并向另一个节点发送中间系统到中间系统（IS-IS）hello（IIH）消息。 相邻广告包括标识符。 如果邻接段是LAN的一部分，则可以将IIH消息发送到指定的节点，该节点聚合LAN上其他节点的邻接段ID通告。

公开(公告)号：US20140019614A1

公开(公告)日：2014-01-16

申请号：US14028026

申请日：2013-09-16

Applicant: Cisco Technology, Inc.

Inventor： Reshad A. Rahman ,  David P. Toscano ,  Sylvain Masse ,  David D. Ward ,  Neil R. Ketley

IPC: H04L12/26

CPC classification number: H04L43/10 ,  H04L41/0663 ,  H04L45/00 ,  H04L45/22 ,  H04L45/24 ,  H04L45/245 ,  H04L45/28 ,  H04L45/58 ,  H04L45/60 ,  H04Q2011/0081 ,  H04Q2213/13162 ,  Y02D50/30

Abstract: In one embodiment, a plurality of links between a network node and another network node are configured as a link bundle. The network node establishes one or more standby bidirectional forwarding detection (BFD) sessions. Each standby BFD session is associated with one or more links of the link bundle. The network node establishes an active BFD session. The active BFD session is associated with one or more links of the link bundle. In response to non-receipt of returned BFD messages for the active BFD session, one or more new active BFD sessions are selected from the one or more standby BFD sessions. In response to non-receipt of returned BFD messages for the one or more new active BFD sessions, it is determined that the link bundle has failed.

Abstract translation: 在一个实施例中，网络节点和另一个网络节点之间的多个链路被配置为链路束。 网络节点建立一个或多个备用双向转发检测（BFD）会话。 每个备用BFD会话与链路束的一个或多个链路相关联。 网络节点建立活动的BFD会话。 活动BFD会话与链路束的一个或多个链路相关联。 响应未接收到活动BFD会话的返回BFD报文，从一个或多个备用BFD会话中选择一个或多个新的活动BFD会话。 响应未收到一个或多个新的活动BFD会话的返回BFD消息，确定链路束已失败。

公开(公告)号：US20130229909A1

公开(公告)日：2013-09-05

申请号：US13861939

申请日：2013-04-12

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Reshad A. Rahman ,  David P. Toscano ,  Sylvain Masse ,  Jonathan Parker ,  David D. Ward

IPC: H04L12/24

CPC classification number: H04L41/0695 ,  H04L69/16

Abstract: In one embodiment, a local network device transmits a connectivity verification protocol control message over a link to a remote network device to attempt to establish a connectivity verification protocol session with the remote network device. In response to non-receipt of a returned connectivity verification protocol control message from the remote network device, the local network device determines that there is an inability to establish a connectivity verification protocol session with the remote network device. The local network device then sends a connectivity verification protocol echo message over the link to the remote network device without establishment of a connectivity verification protocol session. The echo message is sent using a forwarding protocol. In response to receipt of a reply to the connectivity verification protocol echo message from the remote network device, the local network device determines that the forwarding protocol is functioning and uses the link to forward data traffic to the remote network device.

Abstract translation: 在一个实施例中，本地网络设备通过到远程网络设备的链路发送连接性验证协议控制消息，以尝试与远程网络设备建立连接性验证协议会话。 响应于从远程网络设备未收到返回的连接性验证协议控制消息，本地网络设备确定无法与远程网络设备建立连接性验证协议会话。 然后，本地网络设备通过链路向远程网络设备发送连接验证协议回传消息，而不建立连接性验证协议会话。 使用转发协议发送回发消息。 响应于从远程网络设备接收到对连接性验证协议回传消息的回复，本地网络设备确定转发协议正在工作，并使用链路将数据业务转发到远程网络设备。

公开(公告)号：US20130148489A1

公开(公告)日：2013-06-13

申请号：US13760854

申请日：2013-02-06

Applicant: Cisco Technology, Inc.

Inventor： Sami Boutros ,  Muthurajah Sivabalan ,  David D. Ward ,  George Swallow ,  Stewart Frederick Bryant ,  Ian Michael Charles Shand

IPC: H04L12/24

CPC classification number: H04L12/2419 ,  H04L41/06 ,  H04L43/0811 ,  H04L45/26 ,  H04L45/28 ,  H04L45/50 ,  H04L47/10

Abstract: In one embodiment, a maintenance intermediate point (MIP) receives a packet traveling along a multi-protocol label switching (MPLS) label switched path (LSP) that extends from a first maintenance end point (MEP) to a second MEP. The receiving MIP decrements a time-to-live (TTL) value in a header of the packet. In response the TTL value in the header of the packet equaling a particular value, the receiving MIP examines an associated channel header (ACH) field in an operations, administration, and maintenance (OAM) message stored in a payload of the packet, and determines a particular OAM function to perform based on a code in the ACH field. The receiving MIP performs the particular OAM function.

Abstract translation: 在一个实施例中，维护中间点（MIP）接收沿着从第一维护终点（MEP）延伸到第二MEP的多协议标签交换（MPLS）标签交换路径（LSP）行进的分组。 接收MIP减少分组报头中的生存时间（TTL）值。 响应于等于特定值的分组的报头中的TTL值，接收MIP检查存储在分组的有效载荷中的操作，管理和维护（OAM）消息中的相关联的信道报头（ACH）字段，并且确定 基于ACH字段中的代码执行的特定OAM功能。 接收MIP执行特定的OAM功能。

公开(公告)号：US11290340B2

公开(公告)日：2022-03-29

申请号：US16997129

申请日：2020-08-19

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Ahmed R. Bashandy ,  Clarence Filsfils ,  David D. Ward

IPC: H04L12/24 ,  H04L41/12 ,  H04L45/00 ,  H04L45/12 ,  H04L45/50 ,  H04L45/745 ,  H04L45/74 ,  H04L49/60 ,  H04L12/46 ,  H04L47/724

Abstract: An apparatus and method is disclosed for segment routing (SR) over label distribution protocol (LDP). In one embodiment, the method includes a node receiving a packet with an attached segment ID. In response, the node may attach a label to the packet. Thereafter, the node may forward the packet with the attached label and segment ID to another node via a label switched path (LSP).

公开(公告)号：US11038744B2

公开(公告)日：2021-06-15

申请号：US16839273

申请日：2020-04-03

Applicant: Cisco Technology, Inc.

Inventor： David D. Ward ,  Carlos M. Pignataro ,  Frank Brockners ,  Shwetha Subray Bhandari

IPC: H04L12/26 ,  H04L12/46 ,  H04L12/723 ,  H04L12/70 ,  H04L12/24 ,  H04L12/54 ,  H04L29/06

Abstract: Embodiments of the disclosure pertain to activating in-band OAM based on a triggering event. Aspects of the embodiments are directed to receiving a first notification indicating a problem in a network; triggering a data-collection feature on one or more nodes in the network for subsequent packets that traverse the one or more nodes; evaluating a subsequent packet that includes data augmented by the data collection feature; and determining the problem in the network based on the data augmented to the subsequent packet.

公开(公告)号：US10764146B2

公开(公告)日：2020-09-01

申请号：US16367869

申请日：2019-03-28

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Ahmed R. Bashandy ,  Clarence Filsfils ,  David D. Ward

IPC: H04L12/24 ,  H04L12/741 ,  H04L12/721 ,  H04L12/723 ,  H04L12/715 ,  H04L12/931 ,  H04L12/46 ,  H04L12/913

Abstract: An apparatus and method is disclosed for segment routing (SR) over label distribution protocol (LDP). In one embodiment, the method includes a node receiving a packet with an attached segment ID. In response, the node may attach a label to the packet. Thereafter, the node may forward the packet with the attached label and segment ID to another node via a label switched path (LSP).

公开(公告)号：US10652078B2

公开(公告)日：2020-05-12

申请号：US15949189

申请日：2018-04-10

Applicant: Cisco Technology, Inc.

Inventor： David D. Ward ,  Carlos M. Pignataro ,  Frank Brockners ,  Shwetha Subray Bhandari

IPC: H04L12/24 ,  H04L12/46 ,  H04L12/723 ,  H04L12/70 ,  H04L12/54 ,  H04L29/06 ,  H04L12/26

Abstract: Embodiments of the disclosure pertain to activating in-band OAM based on a triggering event. Aspects of the embodiments are directed to receiving a first notification indicating a problem in a network; triggering a data-collection feature on one or more nodes in the network for subsequent packets that traverse the one or more nodes; evaluating a subsequent packet that includes data augmented by the data collection feature; and determining the problem in the network based on the data augmented to the subsequent packet.

公开(公告)号：US10609042B2

公开(公告)日：2020-03-31

申请号：US15387123

申请日：2016-12-21

Applicant: Cisco Technology, Inc.

Inventor： Paul Quinn ,  Michael E. Lipman ,  Mike Milano ,  David D. Ward ,  James Guichard ,  Leonid Sandler ,  Moshe Kravchik ,  Alena Lifar ,  Darrin Miller

IPC: H04L29/06 ,  G06F21/60 ,  H04W12/08 ,  G06F21/62 ,  H04W12/00

Abstract: Various systems and methods for determining whether to allow or continue to allow access to a protected data asset are disclosed herein. For example, one method involves receiving a request to access a protected data asset, wherein the request is received from a first user device; determining whether to grant access to the protected data asset, wherein the determining comprises evaluating one or more criteria associated with the first user device, and the criteria comprises first information associated with a first policy constraint; and in response to a determination that access to the protected data asset is to be granted, granting access to the protected data asset.

公开(公告)号：US10148577B2

公开(公告)日：2018-12-04

申请号：US15449940

申请日：2017-03-04

Applicant: CISCO TECHNOLOGY, INC.

Inventor： James N. Guichard ,  Paul Quinn ,  David D. Ward ,  Carlos M. Pignataro

IPC: H04L12/741 ,  H04L29/06 ,  H04L12/803 ,  H04L29/08 ,  H04W72/04 ,  H04L12/725 ,  H04L12/721 ,  H04L12/851

Abstract: A method for load balancing based on metadata in a network service header. The method includes receiving a packet or frame of a traffic flow, wherein the packet or frame has a payload and the network service header including metadata and service path information for the traffic flow identifying the service path, and the metadata comprises classification information of the packet or frame, extracting, by a service header processor of the load balancer, the classification information of the metadata from the packet or frame, and applying, by a load balancing function of the load balancer, a load balancing policy on the packet or frame based on the classification information of the metadata.