公开(公告)号：US20150334667A1

公开(公告)日：2015-11-19

申请号：US14808469

申请日：2015-07-24

Applicant: Cisco Technology, Inc.

Inventor： Bin Mo ,  David Ojemann ,  George Swallow

IPC: H04W56/00 ,  H04L12/723

CPC classification number: H04W56/002 ,  H04L45/02 ,  H04L45/507

Abstract: A technique may improve LDP-IGP synchronization in a MPLS network when an interface of a router coupled to a communications link along a shortest path between a source router and a destination router becomes newly active. Specifically, an IGP adjacency may be held down over the newly active link while a LDP adjacency is established over the link. The router may inject a temporary, non-redistributable route having a large administrative weight into its routing table utilizing addresses learned during establishment of the LDP adjacency. The injected route ensures that there is a reachable route to a peer router so that LDP may converge. After LDP has converged and all needed label bindings have been distributed in the MPLS network utilizing the injected route, IGP executing on the router may advertise a normal cost metric for the link associated with the newly active interface, and IGP convergence may be completed.

Abstract translation: 当沿着源路由器和目的地路由器之间的最短路径的通信链路的路由器的接口变为新活动时，技术可以改善MPLS网络中的LDP-IGP同步。 具体地说，可以通过链路建立LDP邻接关系，在新活动链路上保持IGP邻接关系。 路由器可以利用在建立LDP邻接过程中学习到的地址，向其路由表中注入具有较大管理权限的临时的，不可重新分发的路由。 注入的路由确保存在到对等路由器的可达路由，以便LDP可以收敛。 LDP已经融合，所有需要的标签绑定都使用注入的路由分布在MPLS网络中，路由器上执行的IGP可以为与新活动接口相关联的链路通告正常的成本指标，并且可以完成IGP收敛。

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：US09876675B1

公开(公告)日：2018-01-23

申请号：US13930840

申请日：2013-06-28

Applicant: Cisco Technology, Inc.

Inventor： George Swallow ,  Eric Osborne

IPC: G06F15/16 ,  H04L12/24 ,  H04L12/723 ,  H04L12/867

CPC classification number: H04L41/0806 ,  H04L45/50 ,  H04L47/629

Abstract: In one embodiment, primary circuits may be established on a network link, where each primary circuit individually allocates primary bandwidth of the network link and is assigned to one of either a respective primary weighted queue of the network link corresponding to a size of the respective primary circuit or a shared primary weighted queue of the network link corresponding to a total size of the individually allocated primary bandwidth for the network link. In addition, protection circuits may also be established on the network link, where the protection circuits collectively allocate shared backup bandwidth of the network link and are assigned to a shared backup weighted queue of the network link corresponding to a size of the shared backup bandwidth for the network link. As such, primary and backup packets may be forwarded on the network link according to the primary and backup weighted queues (e.g., allowing 1:1 protection).

公开(公告)号：US09154411B2

公开(公告)日：2015-10-06

申请号：US13955339

申请日：2013-07-31

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Luca Martini ,  George Swallow

IPC: H04L12/723 ,  H04L12/709 ,  H04L12/721

CPC classification number: H04L45/50 ,  H04L45/245 ,  H04L45/68 ,  Y02D50/30

Abstract: In one embodiment, a method includes generating an aggregated pseudowire status message at a first network device in a Multi-Protocol Label Switching (MPLS) network, transmitting the aggregated pseudowire status message to a second network device on a Label Switched Path (LSP) extending between the first and second network devices in the MPLS network, and establishing at the first network device, an aggregated pseudowire status session with the second network device upon receiving a response to the aggregated pseudowire status message on the LSP. The aggregated pseudowire status message configured to verify a current status of pseudowires on the LSP. An apparatus is also disclosed.

Abstract translation: 在一个实施例中，一种方法包括在多协议标签交换（MPLS）网络中的第一网络设备处生成聚合伪线状态消息，将聚合伪线状态消息发送到扩展标签交换路径（LSP）上的第二网络设备 在所述MPLS网络中的所述第一和第二网络设备之间，以及在所述第一网络设备上建立与所述第二网络设备的聚合伪线状态会话，以在所述LSP上收到对所述聚合伪线状态消息的响应。 聚合伪线状态消息被配置为验证LSP上的伪线的当前状态。 还公开了一种装置。

公开(公告)号：US09608858B2

公开(公告)日：2017-03-28

申请号：US14336839

申请日：2014-07-21

Applicant: Cisco Technology, Inc.

Inventor： Rajiv Asati ,  Nagendra K. Nainar ,  Carlos M. Pignataro ,  George Swallow

IPC: G01R31/08 ,  H04L12/24 ,  H04L12/707 ,  H04L29/14 ,  H04L12/703

CPC classification number: H04L41/0659 ,  H04L43/0811 ,  H04L45/24 ,  H04L45/28 ,  H04L69/40

Abstract: In one embodiment, an ingress router sends a multipath information query across a computer network toward an egress router, and builds an entropy table based on received query responses. The entropy table maps the egress router to one or more available paths to the egress router, and associated entropy information for each respective available path of the one or more available paths. The ingress router may then forward traffic to the egress router using the entropy table to load share the traffic across the one or more available paths using the associated entropy information for each respective available path. In response to detecting a failure of a particular path of the one or more available paths, however, the ingress router then removes the particular path from the entropy table, thereby ceasing forwarding of traffic over the particular path.

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：US09398553B2

公开(公告)日：2016-07-19

申请号：US14808469

申请日：2015-07-24

Applicant: Cisco Technology, Inc.

Inventor： Bin Mo ,  David Ojemann ,  George Swallow

IPC: H04L12/28 ,  H04J3/06 ,  H04W56/00 ,  H04L12/723 ,  H04L12/751

CPC classification number: H04W56/002 ,  H04L45/02 ,  H04L45/507

Abstract: A technique may improve LDP-IGP synchronization in a MPLS network when an interface of a router coupled to a communications link along a shortest path between a source router and a destination router becomes newly active. Specifically, an IGP adjacency may be held down over the newly active link while a LDP adjacency is established over the link. The router may inject a temporary, non-redistributable route having a large administrative weight into its routing table utilizing addresses learned during establishment of the LDP adjacency. The injected route ensures that there is a reachable route to a peer router so that LDP may converge. After LDP has converged and all needed label bindings have been distributed in the MPLS network utilizing the injected route, IGP executing on the router may advertise a normal cost metric for the link associated with the newly active interface, and IGP convergence may be completed.

公开(公告)号：US20160020941A1

公开(公告)日：2016-01-21

申请号：US14336839

申请日：2014-07-21

Applicant: Cisco Technology, Inc.

Inventor： Rajiv Asati ,  Nagendra K. Nainar ,  Carlos M. Pignataro ,  George Swallow

IPC: H04L12/24 ,  H04L12/803 ,  H04L29/14 ,  H04L12/707 ,  H04L12/703

CPC classification number: H04L41/0659 ,  H04L43/0811 ,  H04L45/24 ,  H04L45/28 ,  H04L69/40

Abstract: In one embodiment, an ingress router sends a multipath information query across a computer network toward an egress router, and builds an entropy table based on received query responses. The entropy table maps the egress router to one or more available paths to the egress router, and associated entropy information for each respective available path of the one or more available paths. The ingress router may then forward traffic to the egress router using the entropy table to load share the traffic across the one or more available paths using the associated entropy information for each respective available path. In response to detecting a failure of a particular path of the one or more available paths, however, the ingress router then removes the particular path from the entropy table, thereby ceasing forwarding of traffic over the particular path.

Abstract translation: 在一个实施例中，入口路由器通过计算机网络向出口路由器发送多路径信息查询，并且基于接收到的查询响应构建熵表。 熵表将出口路由器映射到出口路由器的一个或多个可用路径，以及针对一个或多个可用路径的每个相应可用路径的相关熵信息。 入口路由器然后可以使用熵表将业务转发到出口路由器，以使用针对每个相应的可用路径的相关联的熵信息加载共享一个或多个可用路径上的流量。 然而，响应于检测到一个或多个可用路径的特定路径的故障，入口路由器然后从熵表中去除特定路径，从而停止在特定路径上的业务的转发。

公开(公告)号：US20150109907A1

公开(公告)日：2015-04-23

申请号：US14132781

申请日：2013-12-18

Applicant: Cisco Technology, Inc.

Inventor： Nobushige Akiya ,  George Swallow ,  Carlos M. Pignataro ,  Nagendra Kumar

IPC: H04L12/803 ,  H04L12/723

CPC classification number: H04L47/125 ,  H04L45/24 ,  H04L45/48 ,  H04L45/50 ,  H04L45/507 ,  H04L47/12 ,  H04L47/122

Abstract: The present disclosure provides for carrying downstream mapping information in an echo request message and/or echo reply message, which can describe both IP (Internet Protocol) multipath information and label multipath information. A transit node (e.g., an LSR element) that receives an echo request message from an initiator node determines downstream mapping information, which is returned to the initiator node. Transit node determines whether a newly defined type of multipath information (type 10) should be generated to return the downstream mapping information, based on whether transit node performs load balancing based on labels or IP header information, and whether transit node imposes entropy labels. A multipath information type 10 element includes either IP multipath information or label multipath information, as well as associated label multipath information that includes one or more entropy labels that map to the IP or label multipath information being returned.

Abstract translation: 本公开提供在回波请求消息和/或回声应答消息中携带下行映射信息，其可以描述IP（因特网协议）多路径信息和标签多路径信息。 从发起者节点接收回应请求消息的传输节点（例如，LSR元素）确定返回到发起方节点的下行映射信息。 传输节点根据传输节点是否根据标签或IP头信息进行负载均衡，以及传输节点是否施加熵标签，确定是否应生成新定义类型的多路径信息（类型10）以返回下行映射信息。 多路径信息类型10元素包括IP多路径信息或标签多路径信息，以及相关联的标签多路径信息，其包括映射到所返回的IP或标签多路径信息的一个或多个熵标签。

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。