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1. 发明申请

US20140010072A1 SIGNALING CO-ROUTED AND NON CO-ROUTED LSPS OF A BIDIRECTIONAL PACKET TE TUNNEL 有权
标题翻译：双向包装TE隧道的信号共同路由和非共同路由
公开(公告)号：US20140010072A1
公开(公告)日：2014-01-09
申请号：US13541572
申请日：2012-07-03
申请人： Rakesh Gandhi , Muthurajah Sivabalan
发明人： Rakesh Gandhi , Muthurajah Sivabalan
IPC分类号： H04L12/56 , H04L12/24
CPC分类号： H04L47/724 , H04L12/4633 , H04L45/36 , H04L45/50 , H04L47/825
摘要： 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.
摘要翻译：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。

2. 发明申请

US20050083928A1 Transparent re-routing of MPLS traffic engineering LSPs within a link bundle 有权
标题翻译：链路束内MPLS流量工程LSP的透明重路由
公开(公告)号：US20050083928A1
公开(公告)日：2005-04-21
申请号：US10689385
申请日：2003-10-20
申请人： Muthurajah Sivabalan , Rakesh Gandhi , Sami Boutros , Jean Vasseur
发明人： Muthurajah Sivabalan , Rakesh Gandhi , Sami Boutros , Jean Vasseur
IPC分类号： H04L12/56
CPC分类号： H04L45/245 , H04L45/00 , H04L45/22 , H04L45/28 , H04L45/50 , Y02D50/30
摘要： Local rerouting around a failed component link of a link bundle is provided by immediately substituting one or more other component links of the same link bundle. The substitution of component links is performed at the point of failure without signaling to other nodes. This minimizes signaling traffic particularly when large numbers of LSPs are impacted by a single component link failure. Also, since LSP repair can be accomplished very quickly, traffic disruption is minimized.
摘要翻译：通过立即替换相同链路束的一个或多个其他组件链路来提供围绕链路束的故障组件链路的本地重新路由。组件链路的替换在故障点执行，而不向其他节点发信号。这特别是当大量的LSP受到单个组件链路故障的影响时，信令流量最小化。此外，由于可以非常快速地完成LSP修复，所以流量中断被最小化。

3. 发明授权

US07345994B2 Transparent re-routing of MPLS traffic engineering LSPs within a link bundle 有权
标题翻译：链路束内MPLS流量工程LSP的透明重路由
公开(公告)号：US07345994B2
公开(公告)日：2008-03-18
申请号：US10689385
申请日：2003-10-20
申请人： Muthurajah Sivabalan , Rakesh Gandhi , Sami Boutros , Jean Philippe Vasseur
发明人： Muthurajah Sivabalan , Rakesh Gandhi , Sami Boutros , Jean Philippe Vasseur
IPC分类号： H04L12/56
CPC分类号： H04L45/245 , H04L45/00 , H04L45/22 , H04L45/28 , H04L45/50 , Y02D50/30
摘要： Local rerouting around a failed component link of a link bundle is provided by immediately substituting one or more other component links of the same link bundle. The substitution of component links is performed at the point of failure without signaling to other nodes. This minimizes signaling traffic particularly when large numbers of LSPs are impacted by a single component link failure. Also, since LSP repair can be accomplished very quickly, traffic disruption is minimized.
摘要翻译：通过立即替换相同链路束的一个或多个其他组件链路来提供围绕链路束的故障组件链路的本地重新路由。组件链路的替换在故障点执行，而不向其他节点发信号。这特别是当大量的LSP受到单个组件链路故障的影响时，信令流量最小化。此外，由于可以非常快速地完成LSP修复，所以流量中断被最小化。

4. 发明授权

US08750310B2 Signaling co-routed and non co-routed LSPs of a bidirectional packet TE tunnel 有权
标题翻译：双向分组TE隧道的信令共路由和非共路由LSP
公开(公告)号：US08750310B2
公开(公告)日：2014-06-10
申请号：US13541572
申请日：2012-07-03
申请人： Rakesh Gandhi , Muthurajah Sivabalan
发明人： Rakesh Gandhi , Muthurajah Sivabalan
IPC分类号： H04L12/28
CPC分类号： H04L47/724 , H04L12/4633 , H04L45/36 , H04L45/50 , H04L47/825
摘要： 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.
摘要翻译：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。

5. 发明申请

US20150304185A1 Operations Analysis of Packet Groups Identified based on Timestamps 有权
标题翻译：基于时间戳识别的数据包组的操作分析
公开(公告)号：US20150304185A1
公开(公告)日：2015-10-22
申请号：US14256185
申请日：2014-04-18
申请人： Daniel C. Frost , Stewart Frederick Bryant , Muthurajah Sivabalan , Simon James Trevor Spraggs
发明人： Daniel C. Frost , Stewart Frederick Bryant , Muthurajah Sivabalan , Simon James Trevor Spraggs
IPC分类号： H04L12/26 , H04L12/24
CPC分类号： H04L43/106 , H04L43/0829 , H04L43/0852
摘要： In one embodiment, operations analysis of packet groups identified based on timestamps is performed. One embodiment includes sending a plurality of sent timeframe groups of a plurality of time-stamped packets from a first packet network node towards a second packet network node in a network and recording first information associated with each of the plurality of said sent timeframe groups of the plurality of time-stamped packets. The second network node receives a plurality of received timeframe groups of a received plurality of time-stamped packets of said sent plurality of time-stamped packets and recording second information associated with each of the plurality of said received timeframe groups of the received plurality of time-stamped packets. Operations analysis based on one or more operations characteristics of said first information and said second information to produce analysis results.
摘要翻译：在一个实施例中，执行基于时间戳识别的分组组的操作分析。一个实施例包括将多个时间戳分组的多个发送时间帧组从第一分组网络节点发送到网络中的第二分组网络节点，并且记录与多个所述发送的时间帧组中的每一个相关联的第一信息多个时间戳的数据包。所述第二网络节点接收所接收的所述多个时间戳分组的接收到的多个时间戳分组的多个接收到的时间帧组，并且记录与所接收的多个时间帧中的多个所述接收到的时间帧组中的每一个相关联的第二信息被阻塞的数据包。基于所述第一信息和所述第二信息的一个或多个操作特征的操作分析以产生分析结果。

6. 发明授权

US08131873B2 Technique for selecting a path computation element 有权
标题翻译：选择路径计算元素的技术
公开(公告)号：US08131873B2
公开(公告)日：2012-03-06
申请号：US10983280
申请日：2004-11-05
申请人： Jean-Philippe Vasseur , David D. Ward , Muthurajah Sivabalan , Stefano B. Previdi
发明人： Jean-Philippe Vasseur , David D. Ward , Muthurajah Sivabalan , Stefano B. Previdi
IPC分类号： G06F15/173
CPC分类号： H04L45/42 , H04L45/04 , H04L45/12 , H04L45/127 , H04L45/44 , H04L45/58
摘要： A technique efficiently selects a Path Computation Element (PCE) to compute a path between nodes of a computer network. The PCE selection technique is illustratively based on dynamic advertisements of the PCE's available path computation resources, using (i) a low-pass filter algorithm to compute such resources, and (ii) threshold determinations to control distribution of those advertisements. To that end, the novel technique enables one or more PCEs to dynamically send (advertise) their available path computation resources to a Path Computation Client (PCC) by way of the controlled advertisements. In addition, the technique enables the PCC to efficiently select a PCE (or set of PCEs) to service a path computation request based upon those available resources.
摘要翻译：一种技术有效地选择路径计算元素（PCE）来计算计算机网络的节点之间的路径。 PCE选择技术说明性地基于PCE可用路径计算资源的动态广告，使用（i）低通滤波器算法来计算这样的资源，以及（ii）阈值确定以控制这些广告的分布。为此，新技术使得一个或多个PCE能够通过受控广告动态地向路径计算客户端（PCC）发送（通告）它们的可用路径计算资源。此外，该技术使得PCC能够基于这些可用资源有效地选择PCE（或一组PCE）来服务路径计算请求。

7. 发明申请

US20110280121A1 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：US20110280121A1
公开(公告)日：2011-11-17
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： H04L12/24 , H04L12/26
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。

8. 发明授权

US07031262B2 Reoptimization triggering by path computation elements 有权
标题翻译：路径计算元素的优化触发
公开(公告)号：US07031262B2
公开(公告)日：2006-04-18
申请号：US10848744
申请日：2004-05-19
申请人： Jean Philippe Vasseur , David Ward , Muthurajah Sivabalan , Robert Goguen
发明人： Jean Philippe Vasseur , David Ward , Muthurajah Sivabalan , Robert Goguen
IPC分类号： H04L12/26
CPC分类号： H04L45/12 , H04L45/04 , H04L45/125 , H04L45/42 , H04L45/44 , H04L45/50 , H04L45/70 , H04L47/125 , H04L47/762 , H04L47/822 , H04L47/825
摘要： A mechanism to alleviate bandwidth fragmentation in a network employing path computation element(s) to place MPLS Traffic Engineering tunnels. One application is a multiple Autonomous System or multiple area network employing distributed computation of MPLS Traffic Engineering LSPs. A particular path computation element may determine that bandwidth fragmentation is present based on monitoring of path computation failures where desired paths are blocked due to bandwidth constraints. In response to the detected bandwidth fragmentation condition, the path computation element floods a routing notification within its Autonomous System or area. Nodes respond to the routing notification by requesting reoptimization of their own previously requested Traffic Engineering LSPs allowing the path computation element an opportunity to alleviate bandwidth fragmentation.
摘要翻译：一种减轻使用路径计算元素的网络中带宽分段的放置MPLS流量工程隧道的机制。一个应用是采用MPLS流量工程LSP的分布式计算的多自治系统或多区域网络。特定路径计算元件可以基于由于带宽限制阻止期望路径的路径计算失败的监视来确定存在带宽分段。响应于检测到的带宽分段条件，路径计算元件在其自治系统或区域内泛洪路由通知。节点通过请求重新优化自己先前请求的流量工程LSP来响应路由通知，允许路径计算元素减轻带宽分段的机会。

9. 发明申请

US20050177634A1 Technique for graceful shutdown of a routing protocol in a network 有权
标题翻译：网络中路由协议正常关闭的技术
公开(公告)号：US20050177634A1
公开(公告)日：2005-08-11
申请号：US10775877
申请日：2004-02-10
申请人： John Scudder , Muthurajah Sivabalan , David Ward
发明人： John Scudder , Muthurajah Sivabalan , David Ward
IPC分类号： G06F15/16 , G06F15/173 , H04L12/56
CPC分类号： H04L45/02 , H04L45/22
摘要： A graceful shutdown technique modifies a routing protocol to allow an intermediate node, such as a router, to announce to its peer routers (peers) its intention to be gracefully shutdown and removed from service in a network. By announcing its intention to be removed from service, the shutdown router closes (terminates) all connections with its peers and all original routes advertised on those connections are removed (withdrawn) from service. According to the inventive technique, the shutdown router may continue forwarding packets over the network for a “grace” period of time, i.e., the router maintains the validity of those original routes so that packets mapped to the routes are not dropped (at least during the grace period). The grace period also allows backup paths to be propagated to each peer and put into service prior to a final withdrawal of the shutdown router's paths from a forwarding information base of the peer. Thus, the grace period enables the network to continue using the shutdown router as a next hop as it re-converges to use the alternate, backup paths.
摘要翻译：优雅的关机技术修改路由协议，允许诸如路由器之类的中间节点向其对等路由器（对等体）通告其意图被正常关闭并从网络中的服务中删除。关闭路由器通过宣布将其从服务中删除，关闭（终止）与对等体的所有连接，并将从这些连接发布的所有原始路由从服务中删除（撤销）。根据本发明的技术，关闭路由器可以在“宽限”时间段内继续通过网络转发分组，即，路由器保持那些原始路由的有效性，使得映射到路由的分组不被丢弃（至少在宽限期）。宽限期还允许将备份路径传播到每个对等体，并在关闭路由器的路径从对等体的转发信息库最后提取之前投入使用。因此，宽限期允许网络在重新收敛以使用备用路径时继续使用关闭路由器作为下一跳。

10. 发明申请

US20050117512A1 Soft preemption feedback 有权
标题翻译：软抢占反馈
公开(公告)号：US20050117512A1
公开(公告)日：2005-06-02
申请号：US10725606
申请日：2003-12-02
申请人： Jean Vasseur , Ramesh Uppili , Carol Iturralde , Muthurajah Sivabalan
发明人： Jean Vasseur , Ramesh Uppili , Carol Iturralde , Muthurajah Sivabalan
IPC分类号： H04L12/26 , H04L12/56 , H04L29/06
CPC分类号： H04L45/00 , H04L29/06 , H04L45/50 , H04L47/10 , H04L47/2433 , H04L47/245 , H04L47/70 , H04L47/74 , H04L47/765 , H04L47/805 , H04L47/824 , H04L47/825 , H04L47/826 , H04L69/28
摘要： Systems and methods for preemption of Traffic Engineering LSPs such that preemption decisions are made in a coordinated fashion along the path of a new LSP and computation of a new path for a preempted LSP can take advantage of knowledge of newly unavailable links. The efficiency of the preemption mechanism is greatly increased and the undesirable effects of heterogeneous preemption decisions are limited. The amount of signaling may also be significantly reduced. In one implementation, these advantages are achieved by exploiting an upstream preemption feedback mechanism that uses an incremental timer to delay preemption decisions until feedback is available.
摘要翻译：流量工程LSP抢占的系统和方法，使得沿着新LSP的路径以协调的方式进行抢占决策，并为抢占的LSP计算新的路径，可以利用新的不可用链路的知识。抢占机制的效率大大提高，异质抢占决策的不良影响有限。信号量也可以显着降低。在一个实现中，这些优点通过利用上游抢占反馈机制来实现，该机制使用增量定时器来延迟抢占决定，直到反馈可用。

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