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1. 发明授权

US08724454B2 System and method for summarizing alarm indications in a network environment 有权
标题翻译：在网络环境中总结报警指示的系统和方法
公开(公告)号：US08724454B2
公开(公告)日：2014-05-13
申请号：US12778871
申请日：2010-05-12
申请人： Sami Boutros , Nagi Reddy Jonnala , Muthurajah Sivabalan , George Swallow , David D. Ward
发明人： Sami Boutros , Nagi Reddy Jonnala , Muthurajah Sivabalan , George Swallow , David D. Ward
IPC分类号： G01R31/08
CPC分类号： H04L41/0677
摘要： An example method includes detecting a failure at a first network element, the failure is associated with a link between the first network element and a second network element. The method also includes generating a list of network elements to be notified based on the failure, the second network element is included on the list. The method further includes generating an alarm indication signal (AIS) message, the AIS message identifies a plurality of tunnels affected by the failure. The AIS message is communicated to the second network element. In more detailed embodiments, each link between the first network element and the second network element includes a globally unique link identifier, which includes an associated autonomous system number. The globally unique link identifier can represent a string to be associated with the plurality of tunnels, the globally unique link identifier includes a source address and a destination address.
摘要翻译：示例性方法包括检测第一网络元件的故障，故障与第一网络元件和第二网络元件之间的链路相关联。该方法还包括基于故障生成要通知的网元的列表，第二网元包括在列表中。该方法还包括生成报警指示信号（AIS）消息，AIS消息识别受故障影响的多个隧道。 AIS消息被传送到第二网元。在更详细的实施例中，第一网络元件和第二网络元件之间的每个链路包括全球唯一链接标识符，其包括相关联的自主系统号码。全球唯一的链路标识符可以表示要与多个隧道相关联的字符串，全球唯一的链路标识符包括源地址和目的地址。

2. 发明申请

US20130182609A1 TECHNIQUE FOR IMPROVING LDP-IGP SYNCHRONIZATION 有权
公开(公告)号：US20130182609A1
公开(公告)日：2013-07-18
申请号：US13349302
申请日：2012-01-12
申请人： Bin Mo , David Ojemann , George Swallow
发明人： Bin Mo , David Ojemann , George Swallow
IPC分类号： H04L12/28
CPC分类号： H04W56/002 , H04L45/02 , H04L45/507
摘要： 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.

3. 发明授权

US08391163B2 Operating MPLS label switched paths and MPLS pseudowire in loopback mode 有权
标题翻译：在环回模式下运行MPLS标签交换路径和MPLS伪线
公开(公告)号：US08391163B2
公开(公告)日：2013-03-05
申请号：US12383366
申请日：2009-03-23
申请人： Sami Boutros , Muthurajah Sivabalan , David D. Ward , George Swallow , Carlos M. Pignataro
发明人： Sami Boutros , Muthurajah Sivabalan , David D. Ward , George Swallow , Carlos M. Pignataro
IPC分类号： H04J1/16
CPC分类号： H04L43/50 , H04L45/00 , H04L45/20 , H04L45/50 , H04L45/68
摘要： In one embodiment, an initiating maintenance end point (MEP) may transmit a lock message to lock a circuit traversing one or more maintenance intermediate points (MIPs) between the initiating MEP and an end MEP. The initiating MEP may then transmit an in-band packet containing a loopback request to a particular MIP along the circuit using a particular time-to-live (TTL) value in the packet to reach the particular MIP. Upon receiving the packet at the particular MIP, and in response to determining that the TTL has expired, the particular MIP inspects the packet to discover the loopback request, and correspondingly operates in a loopback mode.
摘要翻译：在一个实施例中，启动维护端点（MEP）可以发送锁定消息以锁定经过起始MEP和结束MEP之间的一个或多个维护中间点（MIP）的电路。然后，启动MEP可以使用分组中的特定生存时间（TTL）值将包含环回请求的带内分组沿着电路发送到特定的MIP，以达到特定的MIP。在接收到特定MIP的分组时，响应于确定TTL已经到期，特定MIP检查分组以发现环回请求，并相应地以环回模式工作。

4. 发明授权

US08254271B1 Point-to-multipoint connectivity verification 有权
标题翻译：点对多点连接验证
公开(公告)号：US08254271B1
公开(公告)日：2012-08-28
申请号：US11762218
申请日：2007-06-13
申请人： Thomas D. Nadeau , George Swallow
发明人： Thomas D. Nadeau , George Swallow
IPC分类号： H04L12/26 , G01R31/08
CPC分类号： H04L43/0811 , H04L43/10
摘要： Improved connectivity verification is disclosed. A root in a point-to-multipoint network can establish parameters for a connectivity-verification session with each endpoint in the network. The root then sends verification-request messages to each endpoint in accordance with the parameters. Each endpoint signals an alarm (e.g., sends a reply to the root) if the verification-request messages are not received at the endpoint in accordance with the established parameters. In this manner, endpoints send verification-reply messages to the root much less frequently, greatly reducing the congestion at the root and greatly reducing the chance that the root gets congested or even overwhelmed when the network includes large numbers of endpoints.
摘要翻译：披露了改进的连通性验证。点对多点网络中的根可以建立与网络中每个端点的连接验证会话的参数。根然后根据参数向每个端点发送验证请求消息。如果根据建立的参数在端点处没有接收到验证请求消息，则每个端点发出警报（例如，发送对根的回复）。以这种方式，端点不经常地向基地发送验证回复消息，大大减少了根的拥塞，并大大减少了当网络包含大量端点时根被拥塞甚至被淹没的机会。

5. 发明申请

US20110182189A1 Pseudowire status maintenance for static pseudowires 有权
标题翻译：静态伪线的伪线状态维护
公开(公告)号：US20110182189A1
公开(公告)日：2011-07-28
申请号：US12657676
申请日：2010-01-25
申请人： Luca Martini , George Swallow
发明人： Luca Martini , George Swallow
IPC分类号： H04L12/26
CPC分类号： H04L45/50 , H04L45/245 , H04L45/68 , Y02D50/30
摘要： 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.
摘要翻译：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。

6. 发明申请

US20100238788A1 Connection verification for MPLS label switched paths and pseudowires 有权
标题翻译： MPLS标签交换路径和伪线的连接验证
公开(公告)号：US20100238788A1
公开(公告)日：2010-09-23
申请号：US12383360
申请日：2009-03-23
申请人： Sami Boutros , Muthurajah Sivabalan , David D. Ward , George Swallow , Stewart Bryant , Ian Michael Charles Shand
发明人： Sami Boutros , Muthurajah Sivabalan , David D. Ward , George Swallow , Stewart Bryant , Ian Michael Charles Shand
IPC分类号： G06F11/07 , H04L12/26
CPC分类号： H04L12/2419 , H04L41/06 , H04L43/0811 , H04L45/26 , H04L45/28 , H04L45/50 , H04L47/10
摘要： In one embodiment, a connection verification (CV) message is initiated from an initiating maintenance end point (MEP) for an MPLS LSP, the CV message carried in a packet having a time-to-live (TTL) value of 1. Each maintenance intermediate point (MIP) along the MPLS LSP receives the packet and decrements the TTL, and in response to determining that the TTL equals 0, examines a payload of the packet to determine that the packet carries the CV message. The MIP may then append its MIP ID to a route record field of the payload having any previous MIP IDs of upstream MIPs, and forwards the CV message downstream along the MPLS LSP in a packet having a TTL value of 1. The end MEP receives the CV message, and sends a CV reply having the route record field with MIP IDs and an end MEP ID to the initiating MEP.
摘要翻译：在一个实施例中，从针对MPLS LSP的发起维护端点（MEP）发起连接验证（CV）消息，在具有生存时间（TTL）值为1的分组中携带的CV消息。每个维护沿着MPLS LSP的中间点（MIP）接收分组并递减TTL，并且响应于确定TTL等于0，检查分组的有效载荷以确定分组携带CV消息。然后，MIP可以将其MIP ID附加到具有上游MIP的任何先前MIP ID的有效载荷的路由记录字段，并且在TTL值为1的分组中沿着MPLS LSP向下游转发CV消息。终端MEP接收 CV消息，并将具有MIP ID和终结MEP ID的路由记录字段的CV回复发送到初始MEP。

7. 发明授权

US07406031B1 Multihop nested tunnel restoration 有权
标题翻译： Multihop嵌套隧道恢复
公开(公告)号：US07406031B1
公开(公告)日：2008-07-29
申请号：US10851053
申请日：2004-05-21
申请人： George Swallow
发明人： George Swallow
IPC分类号： G01R31/08
CPC分类号： H04L45/28 , H04L45/00 , H04L45/22 , H04L45/50
摘要： A network communications tunnel is established by assigning a unique label to each communications link between adjacent nodes in a pre-defined network path. A node's unique label is used to forward a data packet to the adjacent node in the pre-defined path. The unique labels for all the nodes in the pre-defined path are stored by each node in the tunnel. A bypass tunnel to bypass a node in the pre-defined path may be established to reroute data packets around a failed communication link in the tunnel. The bypass tunnel may be established before the communication link failure providing fast tunnel restoration.
摘要翻译：通过为预定义的网络路径中的相邻节点之间的每个通信链路分配唯一标签来建立网络通信隧道。节点的唯一标签用于将数据包转发到预定义路径中的相邻节点。预定义路径中所有节点的唯一标签由隧道中的每个节点存储。可以建立绕过预定义路径中的节点的旁路隧道，以在隧道中的故障通信链路周围重新路由数据分组。在通信链路故障提供快速隧道恢复之前，可以建立旁路隧道。

8. 发明申请

US20080008168A1 Methods and apparatus for providing optimal identification and processing of layer 3 control channels 审中-公开
标题翻译：提供第3层控制通道的最佳识别和处理的方法和装置
公开(公告)号：US20080008168A1
公开(公告)日：2008-01-10
申请号：US11482920
申请日：2006-07-07
申请人： Thomas D. Nadeau , Stewart F. Bryant , Simon Barber , David Ward , George Swallow
发明人： Thomas D. Nadeau , Stewart F. Bryant , Simon Barber , David Ward , George Swallow
IPC分类号： H04L12/56
CPC分类号： H04L69/22 , H04L69/325 , H04W80/04
摘要： A method for processing token identifiers for Layer 3 (L3) control channels when encapsulated in a tunneling protocol. Rather than encapsulating an L3 control channel with a secondary L3 (or Layer 4 ‘L4 ’) header, a generic (non-Layer 3 header) identifier, or token identifier, is used to encapsulate the control channel. For example, the token identifier may be a simple bit pattern that does not require a complex, confusing or redundant IP/UDP routing table lookup. Instead, the token identifier simply alerts the forwarding entity that local processing of the packet's data is required (e.g., that the packet contains control channel data).
摘要翻译：一种用于在封装在隧道协议中时处理第3层（L3）控制信道的令牌标识符的方法。使用辅助L3（或层4'L4'）报头封装L3控制信道，而不是使用通用（非第3层报头）标识符或令牌标识符来封装控制信道。例如，令牌标识符可以是不需要复杂，混淆或冗余的IP / UDP路由表查找的简单位模式。相反，令牌标识符简单地提醒转发实体，需要对分组的数据进行本地处理（例如，该分组包含控制信道数据）。

9. 发明申请

US20060087965A1 Method and apparatus for forwarding data in a data communications network 有权
公开(公告)号：US20060087965A1
公开(公告)日：2006-04-27
申请号：US10976076
申请日：2004-10-27
申请人： Ian Michael Shand , Stewart Bryant , Anna Charny , Bruce Davie , George Swallow
发明人： Ian Michael Shand , Stewart Bryant , Anna Charny , Bruce Davie , George Swallow
IPC分类号： H04J3/14 , H04J1/16 , H04L12/56
CPC分类号： H04L45/00 , H04L41/0663 , H04L45/22 , H04L45/28 , H04L45/50 , H04L69/40 , H04Q3/66 , H04Q2213/13141 , H04Q2213/13145 , H04Q2213/13166 , H04Q2213/13204 , H04Q2213/13348 , H04Q2213/13389
摘要： A method of forwarding data in a data communications network having a plurality of nodes comprises the steps, performed at a repairing node, of computing the repair path around a network component to a target node and forwarding data along the repair path. The computing step comprises the step of computing an intermediate node reachable by the repairing node and from which the target node can be reached. The forwarding step includes the step of constructing a Multi-Protocol Label Switching (MPLS) packet for forwarding to the intermediate node.

10. 发明授权

US09124484B2 Technique for improving LDP-IGP synchronization 有权
标题翻译：改善LDP-IGP同步的技术
公开(公告)号：US09124484B2
公开(公告)日：2015-09-01
申请号：US13349302
申请日：2012-01-12
申请人： Bin Mo , David Ojemann , George Swallow
发明人： Bin Mo , David Ojemann , George Swallow
IPC分类号： H04L12/28 , H04J3/06 , H04L12/751 , H04L12/723
CPC分类号： H04W56/002 , H04L45/02 , H04L45/507
摘要： 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.
摘要翻译：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。

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