公开(公告)号：US09001644B2

公开(公告)日：2015-04-07

申请号：US13769474

申请日：2013-02-18

Applicant: Cisco Technology, Inc.

Inventor： Samer Salam ,  Ali Sajassi ,  Sami Boutros

IPC: H04L12/26 ,  H04L12/24 ,  H04L12/437

CPC classification number: H04L41/0677 ,  H04L12/437 ,  H04L41/0659

Abstract: In one embodiment, a method includes obtaining a first indication from a first source included in an Ethernet ring and obtaining a second indication from a second source associated with a provider edge (PE) node The method also includes determining when the first indication and the second indication are indicative of a direct failure of the PE node and determining when the first indication and the second indication are indicative of a ring partition failure associated with the Ethernet ring. The direct failure of the PE node is identified when it is determined that the first indication and the second indication are indicative of the direct failure of the PE node, and the ring partition failure associated with the Ethernet ring is identified when it is determined that the first indication and the second indication are indicative of the ring partition failure associated with the Ethernet ring.

Abstract translation: 在一个实施例中，一种方法包括从包括在以太网环中的第一源获得第一指示，并且从与提供商边缘（PE）节点相关联的第二源获得第二指示。该方法还包括确定何时第一指示和第二指示 指示表示PE节点的直接故障，并且确定何时第一指示和第二指示指示与以太网环相关联的环分区故障。 当确定第一指示和第二指示指示PE节点的直接故障时，识别PE节点的直接故障，并且当确定与以太网环相关联的环分区故障被确定为 第一指示和第二指示指示与以太网环相关联的环分区故障。

公开(公告)号：US20170054626A1

公开(公告)日：2017-02-23

申请号：US14832888

申请日：2015-08-21

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Muthurajah Sivabalan ,  Sami Boutros ,  Peter Psenak ,  Rex Emmanuel Fernando ,  Clarence Filsfils

IPC: H04L12/755 ,  H04L12/707 ,  H04L12/46

CPC classification number: H04L45/021 ,  H04L12/4662 ,  H04L45/22 ,  H04L45/64

Abstract: A method and system are disclosed for distributing (advertising) segment identifiers in network functions virtualization and/or software defined networking environments. An exemplary method includes receiving a route advertisement that includes a prefix with a forwarding address for a first network element and receiving a segment identifier (SID) advertisement that includes a prefix SID for the prefix. The route advertisement may be received from a second network element proxying control plane functions for the first network element. Reachability information for the first network element is updated based on the route advertisement and the SID advertisement.

Abstract translation: 公开了用于在网络功能虚拟化和/或软件定义的网络环境中分发（广告）段标识符的方法和系统。 一种示例性方法包括：接收包括具有第一网络元件的转发地址的前缀的路由通告，并且接收包括前缀的前缀SID的段标识符（SID）通告。 路由通告可以从第二网络元件接收用于第一网络元件的代理控制平面功能。 基于路由广告和SID广告来更新第一网元的可达性信息。

公开(公告)号：US20170026233A1

公开(公告)日：2017-01-26

申请号：US14805273

申请日：2015-07-21

Applicant: Cisco Technology, Inc.

Inventor： Sami Boutros ,  Rex Fernando ,  Ali Sajassi ,  Dhananjaya Rao

IPC: H04L12/24

CPC classification number: H04L41/0806 ,  H04L12/4633 ,  H04L41/0816 ,  H04L41/0886 ,  H04L41/12 ,  H04L41/5048 ,  H04L41/5054

Abstract: In one embodiment, a network controller identifies a first sign of life for an edge device in a communication network (e.g., when the network controller receives an encapsulated workflow request for the edge device over a control plane of the communication network). The network controller further imports the encapsulated workflow request from the edge device over the control plane, determines configuration parameters for a tenant and a tenant network from the encapsulated workflow request, and transmits the configuration parameters to the edge device to provision the edge device for the tenant according to the configuration parameters.

Abstract translation: 在一个实施例中，网络控制器为通信网络中的边缘设备识别生命的第一符号（例如，当网络控制器通过通信网络的控制平面接收边缘设备的封装的工作流请求时）。 网络控制器还通过控制平面从边缘设备导入封装的工作流请求，从封装的工作流请求中确定租户和租户网络的配置参数，并将配置参数发送给边缘设备，为边缘设备提供边缘设备 租户根据配置参数。

公开(公告)号：US09419885B2

公开(公告)日：2016-08-16

申请号：US13770624

申请日：2013-02-19

Applicant: Cisco Technology, Inc.

Inventor： Sami Boutros ,  Muthurajah Sivabalan ,  David D. Ward ,  George Swallow ,  Carlos M. Pignataro

IPC: H04L12/26 ,  H04L12/701 ,  H04L12/733 ,  H04L12/723 ,  H04L12/721

CPC classification number: H04L43/50 ,  H04L45/00 ,  H04L45/20 ,  H04L45/50 ,  H04L45/68

Abstract: In one embodiment, a circuit that extends between a head-end label switching router (LSR) and a tail-end LSR and traverses one or more intermediate LSRs is locked to data plane traffic. The head-end LSR transmits a packet along the circuit that includes a particular time-to-live (TTL) value configured to expire at a particular intermediate LSR at which loopback is to occur. The circuit is used in a loopback mode. The head-end LSR transmits along the circuit a packet that includes a cease loopback request. The circuit ceases to be used in the loopback mode. The circuit is unlocked to permit the circuit to pass data plane traffic.

Abstract translation: 在一个实施例中，在头端标签交换路由器（LSR）和尾端LSR之间延伸并且遍历一个或多个中间LSR的电路被锁定到数据平面业务。 前端LSR沿着电路发送包括特定生存时间（TTL）值的数据包，配置为在发生环回的特定中间LSR处到期。 该电路用于环回模式。 前端LSR沿着电路传输包括停止回送请求的数据包。 电路不再用于环回模式。 电路被解锁以允许电路通过数据平面流量。

公开(公告)号：US20150280940A1

公开(公告)日：2015-10-01

申请号：US14740512

申请日：2015-06-16

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samer Salam ,  Sami Boutros

IPC: H04L12/46 ,  H04L12/18 ,  H04L29/12 ,  H04L12/751

CPC classification number: H04L12/4679 ,  H04L12/1863 ,  H04L45/02 ,  H04L45/48 ,  H04L45/50 ,  H04L61/2069

Abstract: Techniques for stitching multicast trees in a multiple data center environment. According to one embodiment, a technique for stitching multicast trees is provided, which includes determining, at an edge device of a data center, one or more Virtual Local Area Networks (VLANs) assigned to the edge device as a result of a designated forwarder election. An assigned forwarder message is sent by the edge device to one or more devices on the data center, the assigned forwarder message advertising the edge device as a designated forwarder for the VLANs assigned to the edge device. For each of the VLANs assigned to the edge device, the assigned forwarder message causes the edge device to be included in a multicast tree for the VLAN when the assigned forwarder message is received by specific ones of the devices in the data center that are associated with the VLAN.

Abstract translation: 在多数据中心环境中拼接多播树的技术。 根据一个实施例，提供了一种用于拼接多播树的技术，其包括在数据中心的边缘设备处确定由于指定的转发器选举而分配给边缘设备的一个或多个虚拟局域网（VLAN） 。 分配的转发器消息由边缘设备发送到数据中心上的一个或多个设备，所分配的转发器消息将边缘设备通告为分配给边缘设备的VLAN的指定转发器。 对于分配给边缘设备的每个VLAN，分配的转发器消息使得边缘设备被包含在VLAN的多播树中，当分配的转发器消息被数据中心中与数据中心相关联的特定设备接收时 VLAN。

公开(公告)号：US20150085860A1

公开(公告)日：2015-03-26

申请号：US14500046

申请日：2014-09-29

Applicant: Cisco Technology, Inc.

Inventor： Sami Boutros ,  Sylvain Masse ,  Clarence Filsfils

IPC: H04L12/26 ,  H04L29/06 ,  H04L12/709

CPC classification number: H04L43/0811 ,  H04L41/0663 ,  H04L45/245 ,  H04L45/68 ,  H04L69/16 ,  Y02D50/30

Abstract: In one embodiment, a connectivity verification protocol (CVP) session for a particular virtual interface (VI) may operate on a particular group of two or more line cards (LCs) on a network device. The group of LCs may then transmit CVP session packets, at a reduced rate that is sufficient to maintain the CVP session based on a negotiated CVP full rate, onto the particular VI through ingress path processing on the network device. Ingress path processing, in particular, takes transmitted CVP session packets and egresses them onto an appropriate LC of the network device currently responsible for the VI egress. Also, in response to receiving CVP session packets for the VI on an LC of the network device currently responsible for the VI ingress, the receiving LC may forward the received CVP session packets to the particular corresponding group of LCs, which may then process the received CVP session packets.

Abstract translation: 在一个实施例中，用于特定虚拟接口（VI）的连接性验证协议（CVP）会话可以在网络设备上的两个或多个线路卡（LC）的特定组上操作。 然后，LC组可以以足够的速率传输CVP会话分组，该速率足以通过协商的CVP全速率将CVP会话维持在通过网络设备上的入口路径处理的特定VI上。 入口路径处理特别是将传输的CVP会话数据包发送到当前负责VI出口的网络设备的适当LC上。 此外，响应于在当前负责VI入口的网络设备的LC上接收到针对VI的CVP会话分组，接收LC可以将接收的CVP会话分组转发到特定对应的LC组，然后可以处理接收的 CVP会话数据包。

公开(公告)号：US20150071080A1

公开(公告)日：2015-03-12

申请号：US14022382

申请日：2013-09-10

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samer Salam ,  Sami Boutros

IPC: H04L12/733

CPC classification number: H04L45/126 ,  H04L12/4641 ,  H04L45/48 ,  H04L45/66

Abstract: In one embodiment, a particular autonomous system border router (ASBR), in a control-plane media access control (MAC) learning (CPML) network, discovers other ASBRs in the CPML network, the particular ASBR and other ASBRs interconnected with respective ASBRs of a data-plane MAC learning (DPML) network. The particular ASBR calculates one or more internal shortest path first (SPF) trees rooted respectively at each of the other ASBRs in the CPML network, and upon receiving a MAC advertisement route for a given MAC address with a given next-hop IP address, it may determine a distance from the particular and each other ASBR in the CPML network to the given IP address based on the internal SPF trees. In response to the distance from the particular ASBR being shorter than the distance from each other ASBR, the particular ASBR is designated as a designated forwarder (DF) for traffic sourced from the given MAC address.

Abstract translation: 在一个实施例中，在控制平面媒体访问控制（MAC）学习（CPML）网络中的特定自治系统边界路由器（ASBR）发现CPML网络中的其他ASBR，与ASBR相关联的ASBR和ASBR 数据平面MAC学习（DPML）网络。 特定的ASBR计算分别在CPML网络中的每个其他ASBR上的一个或多个内部最短路径优先（SPF）树，并且在接收到具有给定下一跳IP地址的给定MAC地址的MAC广告路由时， 可以根据内部SPF树确定从CPML网络中的特定和彼此ASBR到给定IP地址的距离。 响应于距离特定ASBR的距离短于彼此的距离ASBR，特定ASBR被指定为来自给定MAC地址的流量的指定转发器（DF）。

公开(公告)号：US08976682B2

公开(公告)日：2015-03-10

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 ,  H04L12/26 ,  H04L12/721 ,  H04L12/703 ,  H04L12/723 ,  H04L12/801

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：US20150003450A1

公开(公告)日：2015-01-01

申请号：US13930680

申请日：2013-06-28

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Samer Salam ,  Ali Sajassi ,  Ayan Banerjee ,  Sami Boutros

IPC: H04L12/18

CPC classification number: H04L12/1836

Abstract: In one embodiment, a particular PE device of a plurality of multi-homing PE devices between a core network and a local network determines a subset of traffic for which the particular PE device is responsible. The particular PE also establishes, with itself as root, a multicast tree within the local network for underlay multicast groups. Traffic received at the particular PE from the core network is admitted into the local network only if the core traffic corresponds to the subset of traffic for which the particular PE device is responsible (and mapped into one of the underlay multicast groups for which the particular PE device is the root). Also, multicast traffic received at the particular PE from the local network is forwarded into the core network only if the multicast traffic corresponds to the subset of traffic for which the particular PE device is responsible.

Abstract translation: 在一个实施例中，核心网络和本地网络之间的多个多归属PE设备的特定PE设备确定特定PE设备负责的流量子集。 特定的PE还以本身为根建立本地网络内的组播树，用于底层组播组。 只有当核心流量对应于特定PE设备负责的流量子集（并映射到特定PE的底层多播组中的一个）时，才从核心网络在特定PE处接收到的流量被允许进入本地网络 设备是根）。 此外，仅当组播流量对应于特定PE设备所负责的业务子集时，才将来自本地网络的特定PE处接收到的组播流量转发到核心网络。

公开(公告)号：US20130155877A1

公开(公告)日：2013-06-20

申请号：US13770624

申请日：2013-02-19

Applicant: Cisco Technology, Inc.

Inventor： Sami Boutros ,  Muthurajah Sivabalan ,  David D. Ward ,  George Swallow ,  Carlos M. Pignataro

IPC: H04L12/26

CPC classification number: H04L43/50 ,  H04L45/00 ,  H04L45/20 ,  H04L45/50 ,  H04L45/68

Abstract: In one embodiment, a circuit that extends between a head-end label switching router (LSR) and a tail-end LSR and traverses one or more intermediate LSRs is locked to data plane traffic. The head-end LSR transmits a packet along the circuit that includes a particular time-to-live (TTL) value configured to expire at a particular intermediate LSR at which loopback is to occur. The circuit is used in a loopback mode. The head-end LSR transmits along the circuit a packet that includes a cease loopback request. The circuit ceases to be used in the loopback mode. The circuit is unlocked to permit the circuit to pass data plane traffic.

Abstract translation: 在一个实施例中，在头端标签交换路由器（LSR）和尾端LSR之间延伸并且遍历一个或多个中间LSR的电路被锁定到数据平面业务。 前端LSR沿着电路发送包括特定生存时间（TTL）值的数据包，配置为在发生环回的特定中间LSR处到期。 该电路用于环回模式。 前端LSR沿着电路传输包括停止回送请求的数据包。 电路不再用于环回模式。 电路被解锁以允许电路通过数据平面流量。