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公开(公告)号：US09160652B2
公开(公告)日：2015-10-13
申请号：US13600834
申请日：2012-08-31
Applicant: Michel Taillon , Tarek Saad , Rakesh Gandhi , Zafar Ali
Inventor： Michel Taillon , Tarek Saad , Rakesh Gandhi , Zafar Ali
IPC: H04L29/14 , H04L12/707 , H04L12/703 , H04L12/723
Abstract: In one embodiment, network devices are configured to route traffic and signaling onto co-routed bypass tunnels. Co-routed bypass tunnels protect against node or link failures in a label switched paths. The co-routed bypass tunnels provide bidirectional protection. In one example, a node acting as the point of local repair (PLR) receives a resource reservation state message at a first node and extracts a tunnel sender address from the reservation state message. The PLR is configured to identify a bypass tunnel to a second node in the reverse direction of the label switched path and signal resource reservation messages over the bypass tunnel in the reverse direction. In another example, a PLR receives a resource reservation message with bypass tunnel identification and the PLR is configured to identify a bypass tunnel to a second node in the reverse direction.
Abstract translation: 在一个实施例中，网络设备被配置为将通信量和信令路由到共路由旁路隧道。 路由旁路隧道可防止标签交换路径中的节点或链路故障。 共路旁路隧道提供双向保护。 在一个示例中，充当本地修复点（PLR）的节点在第一节点处接收资源预留状态消息，并从预留状态消息中提取隧道发送方地址。 PLR被配置为在相反方向上通过旁路隧道来识别在标签交换路径的相反方向上的第二节点的旁路隧道和信号资源预留消息。 在另一示例中，PLR接收具有旁路隧道标识的资源预留消息，并且PLR被配置为在相反方向上识别到第二节点的旁路隧道。
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公开(公告)号：US20140064062A1
公开(公告)日：2014-03-06
申请号：US13600834
申请日：2012-08-31
Applicant: Michel Taillon , Tarek Saad , Rakesh Gandhi , Zafar Ali
Inventor： Michel Taillon , Tarek Saad , Rakesh Gandhi , Zafar Ali
Abstract: In one embodiment, network devices are configured to route traffic and signaling onto co-routed bypass tunnels. Co-routed bypass tunnels protect against node or link failures in a label switched paths. The co-routed bypass tunnels provide bidirectional protection. In one example, a node acting as the point of local repair (PLR) receives a resource reservation state message at a first node and extracts a tunnel sender address from the reservation state message. The PLR is configured to identify a bypass tunnel to a second node in the reverse direction of the label switched path and signal resource reservation messages over the bypass tunnel in the reverse direction. In another example, a PLR receives a resource reservation message with bypass tunnel identification and the PLR is configured to identify a bypass tunnel to a second node in the reverse direction.
Abstract translation: 在一个实施例中，网络设备被配置为将通信量和信令路由到共路由旁路隧道。 路由旁路隧道可防止标签交换路径中的节点或链路故障。 共路旁路隧道提供双向保护。 在一个示例中，充当本地修复点（PLR）的节点在第一节点处接收资源预留状态消息，并从预留状态消息中提取隧道发送方地址。 PLR被配置为在相反方向上通过旁路隧道来识别在标签交换路径的相反方向上的第二节点的旁路隧道和信号资源预留消息。 在另一示例中，PLR接收具有旁路隧道标识的资源预留消息，并且PLR被配置为在相反方向上识别到第二节点的旁路隧道。
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公开(公告)号：US08798050B1
公开(公告)日：2014-08-05
申请号：US13562013
申请日：2012-07-30
Applicant: Rakesh Gandhi , Tarek Saad , Zafar Ali
Inventor： Rakesh Gandhi , Tarek Saad , Zafar Ali
IPC: H04L12/701 , H04L12/801 , H04L29/00 , H04L12/56 , H04L29/06
CPC classification number: H04L45/00 , H04L12/18 , H04L29/0653 , H04L45/48 , H04L45/50 , H04L47/10 , H04L49/351
Abstract: In one embodiment, for a point to multipoint label switched path, an intermediate node receives a re-evaluation request from a head-end node for at least one routing path having a destination in a loosely routed network for a single destination or for a plurality of destinations in the label switched path forming tree or sub-tree. In response to the re-evaluation request, the intermediate node determines an availability for a remerge-free preferred path for the destination(s), which includes at least one loosely routed next hop, and the intermediate node transmits a preferred path available message to the head-end node based on the determined availability of the remerge-free preferred path.
Abstract translation: 在一个实施例中，对于点到多点标签交换路径，中间节点从头端节点接收针对至少一个路由路径的重新评估请求，该路由路径具有用于单个目的地的松散路由网络中的目的地或多个 的标签交换路径形成树或子树中的目的地。 响应于重新评估请求，中间节点确定用于目的地的无重新无优选路径的可用性，该目的地包括至少一个松散路由的下一跳，并且中间节点将优选路径可用消息发送到 基于确定的无重载优选路径的可用性的前端节点。
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公开(公告)号：US08462638B2
公开(公告)日：2013-06-11
申请号：US13077352
申请日：2011-03-31
Applicant: Rakesh Gandhi , Robert Sawaya , Tarek Saad , Junaid Israr
Inventor： Rakesh Gandhi , Robert Sawaya , Tarek Saad , Junaid Israr
IPC: G01R31/08
CPC classification number: H04L45/50 , H04L47/245 , H04L47/724 , H04L47/805
Abstract: In an embodiment, a method is disclosed for minimizing soft preemptions of LSPs. Upon receiving a reservation message for an LSP whose requested bandwidth that exceeds the available bandwidth of downstream links, a network node may select a set of LSPs for soft preemption and share the selection with other nodes along their paths, both upstream and downstream. By coordinating the selection of LSPs to soft-preempt among nodes on the path, fewer LSPs may require soft preemption, which may result in minimizing excessive network disruptions, and thus, allowing the network to function more efficiently.
Abstract translation: 在一个实施例中，公开了一种用于最小化LSP的软抢占的方法。 一旦接收到请求的带宽超过下游链路的可用带宽的LSP的预留消息，网络节点可以选择一组用于软抢占的LSP，并与上游和下游沿着其路径的其他节点共享选择。 通过将LSP的选择协调为在路径上的节点之间进行软抢占，较少的LSP可能需要软抢占，这可能导致最小化过度的网络中断，从而允许网络更有效地运行。
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公开(公告)号：US20120250696A1
公开(公告)日：2012-10-04
申请号：US13077352
申请日：2011-03-31
Applicant: Rakesh Gandhi , Robert Sawaya , Tarek Saad , Junaid Israr
Inventor： Rakesh Gandhi , Robert Sawaya , Tarek Saad , Junaid Israr
IPC: H04L12/56
CPC classification number: H04L45/50 , H04L47/245 , H04L47/724 , H04L47/805
Abstract: In an embodiment, a method is disclosed for minimizing soft preemptions of LSPs. Upon receiving a reservation message for an LSP whose requested bandwidth that exceeds the available bandwidth of downstream links, a network node may select a set of LSPs for soft preemption and share the selection with other nodes along their paths, both upstream and downstream. By coordinating the selection of LSPs to soft-preempt among nodes on the path, fewer LSPs may require soft preemption, which may result in minimizing excessive network disruptions, and thus, allowing the network to function more efficiently.
Abstract translation: 在一个实施例中，公开了一种用于最小化LSP的软抢占的方法。 一旦接收到请求的带宽超过下游链路的可用带宽的LSP的预留消息，网络节点可以选择一组用于软抢占的LSP，并与上游和下游沿着其路径的其他节点共享选择。 通过将LSP的选择协调为在路径上的节点之间进行软抢占，较少的LSP可能需要软抢占，这可能导致最小化过度的网络中断，从而允许网络更有效地运行。
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6.发明申请System and Method for Efficient Point-to-Multi-point Traffic Engineering (P2MP-TE) Path Protection 有权高效点对点流量工程（P2MP-TE）路径保护系统与方法
公开(公告)号：US20140003229A1
公开(公告)日：2014-01-02
申请号：US13534543
申请日：2012-06-27
Applicant: Rakesh Gandhi , Zafar Ali
Inventor： Rakesh Gandhi , Zafar Ali
CPC classification number: H04L12/1863 , H04L12/185 , H04L45/28
Abstract: A path protection method that includes: establishing a point to multi-point (P2MP) tree spanning from a head node to a plurality of tail nodes, the P2MP tree providing a label switched path (LSP) from the head node to a particular tail node; identifying a first and a second pluralities of source-to-leaf (S2L) sub-LSPs for the LSP included within the P2MP tree, each corresponding pair of S2L sub-LSP in the first and second pluralities are path diverse; setting a first flag in a RSVP path message to designate the second plurality of S2L sub-LSPs as protecting respective S2L sub-LSPs in the first plurality at a baseline level of protection; setting a second flag to designate a subset of S2L sub-LSPs in the second plurality as protecting respective S2L sub-LSPs in the first plurality at an elevated level of protection; and transmitting the RSVP path message.
Abstract translation: 一种路径保护方法，包括：建立从头节点到多个尾节点的多点（P2MP）点的点，所述P2MP树提供从头节点到特定尾节点的标签交换路径（LSP） ; 识别P2MP树中包含的LSP的第一和第二多个源 - 叶（S2L）子LSP，第一和第二多个的每个对应的S2L子LSP对都是路径多样的; 在RSVP路径消息中设置第一标志，以将第二多个S2L子LSP指定为在基准保护级别保护第一组中的各个S2L子LSP; 设置第二标志以指定第二多个中的S2L子LSP的子集，以在提升的保护级别上保护第一多个中的各个S2L子LSP; 并发送RSVP路径消息。
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7.发明授权System and method for efficient point-to-multi-point traffic engineering (P2MP-TE) path protection 有权高效的点到多点流量工程（P2MP-TE）路径保护的系统和方法
公开(公告)号：US09112713B2
公开(公告)日：2015-08-18
申请号：US13534543
申请日：2012-06-27
Applicant: Rakesh Gandhi , Zafar Ali
Inventor： Rakesh Gandhi , Zafar Ali
IPC: G01R31/08 , H04L12/18 , H04L12/703
CPC classification number: H04L12/1863 , H04L12/185 , H04L45/28
Abstract: A path protection method that includes: establishing a point to multi-point (P2MP) tree spanning from a head node to a plurality of tail nodes, the P2MP tree providing a label switched path (LSP) from the head node to a particular tail node; identifying a first and a second pluralities of source-to-leaf (S2L) sub-LSPs for the LSP included within the P2MP tree, each corresponding pair of S2L sub-LSP in the first and second pluralities are path diverse; setting a first flag in a RSVP path message to designate the second plurality of S2L sub-LSPs as protecting respective S2L sub-LSPs in the first plurality at a baseline level of protection; setting a second flag to designate a subset of S2L sub-LSPs in the second plurality as protecting respective S2L sub-LSPs in the first plurality at an elevated level of protection; and transmitting the RSVP path message.
Abstract translation: 一种路径保护方法，包括：建立从头节点到多个尾节点的多点（P2MP）点的点，所述P2MP树提供从头节点到特定尾节点的标签交换路径（LSP） ; 识别P2MP树中包含的LSP的第一和第二多个源 - 叶（S2L）子LSP，第一和第二多个的每个对应的S2L子LSP对都是路径多样的; 在RSVP路径消息中设置第一标志，以将第二多个S2L子LSP指定为在基准保护级别保护第一组中的各个S2L子LSP; 设置第二标志以指定第二多个中的S2L子LSP的子集，以在提升的保护级别上保护第一多个中的各个S2L子LSP; 并发送RSVP路径消息。
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8.发明授权
公开(公告)号：US08576708B2
公开(公告)日：2013-11-05
申请号：US13151639
申请日：2011-06-02
Applicant: Rakesh Gandhi , Eric W. Osborne , Prabhu Vaithilingam , Robert Sawaya , Junaid Israr
Inventor： Rakesh Gandhi , Eric W. Osborne , Prabhu Vaithilingam , Robert Sawaya , Junaid Israr
CPC classification number: H04L41/0893 , H04L41/0663
Abstract: In one embodiment, certain SRLGs associated with members of a bundle are deemed to be “risk-free SRLGs”, i.e., SRLGs whose failure may not substantially impact the capacity of the bundle to carry traffic in a computer network. In a bandwidth unaware embodiment a number of active members of the bundle is identified for each SRLG, and a bandwidth aware embodiment further specifies an available bandwidth capacity for each SRLG to determine risk-free SRLGs. A backup path or tunnel may be established and utilized to protect a communication link as long as the SRLGs shared are deemed to be risk-free SRLGs.
Abstract translation: 在一个实施例中，与束的成员相关联的某些SRLG被认为是“无风险的SRLG”，即其失败可能不会显着地影响捆绑在计算机网络中的业务容量的SRLG。 在带宽未知的实施例中，针对每个SRLG识别捆绑的多个活动成员，并且带宽感知实施例进一步指定每个SRLG的可用带宽容量以确定无风险的SRLG。 只要SRLG共享被认为是无风险的SRLG，可以建立并利用备份路径或隧道来保护通信链路。
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9.发明授权Transparent re-routing of MPLS traffic engineering LSPs within a link bundle 有权链路束内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
Applicant: Muthurajah Sivabalan , Rakesh Gandhi , Sami Boutros , Jean Philippe Vasseur
Inventor： Muthurajah Sivabalan , Rakesh Gandhi , Sami Boutros , Jean Philippe Vasseur
IPC: H04L12/56
Abstract: 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.
Abstract translation: 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。
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10.发明申请SIGNALING CO-ROUTED AND NON CO-ROUTED LSPS OF A BIDIRECTIONAL PACKET TE TUNNEL 有权双向包装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
Applicant: Rakesh Gandhi , Muthurajah Sivabalan
Inventor： Rakesh Gandhi , Muthurajah Sivabalan
CPC classification number: H04L47/724 , H04L12/4633 , H04L45/36 , H04L45/50 , H04L47/825
Abstract: 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.
Abstract translation: 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。
