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1. 发明授权

US08259564B1 Egress protection for label switched paths 有权
标题翻译：出口保护标签交换路径
公开(公告)号：US08259564B1
公开(公告)日：2012-09-04
申请号：US12425503
申请日：2009-04-17
申请人： Hannes Gredler , John Galen Scudder , Nischal Sheth , Yakov Rekhter
发明人： Hannes Gredler , John Galen Scudder , Nischal Sheth , Yakov Rekhter
IPC分类号： G06F11/00
CPC分类号： G06F11/2005 , H04L45/507
摘要： This disclosure describes techniques for protecting an endpoint of a label switched path. In one embodiment, a system includes an ingress router, a primary egress router, backup router, and a point of local repair (PLR) router. The ingress router, the PLR router, and the first egress router form a first label switched path. The backup router provides protection for the primary egress router such that the backup router provides routing services for the first egress router when the first egress router is not available. The primary egress router and the backup router share an anycast IP address. The backup router advertises a route to reach the primary egress router, but upon receiving a packet intended for the primary egress router, the backup router identifies the destination of the packet and forwards the packet to the destination instead of the primary egress router along a different route.
摘要翻译：本公开描述了用于保护标签交换路径的端点的技术。在一个实施例中，系统包括入口路由器，主出口路由器，备用路由器和本地修复（PLR）路由器的点。入口路由器，PLR路由器和第一出口路由器形成第一标签交换路径。备用路由器为主出口路由器提供保护，使得当第一出口路由器不可用时，备用路由器为第一出口路由器提供路由服务。主出口路由器和备份路由器共享一个任播IP地址。备用路由器通告路由到达主要出口路由器，但是在接收到主出口路由器的数据包后，备份路由器会识别报文的目的地，并将数据包转发到目的地而不是主出口路由器路线。

2. 发明授权

US08611359B1 Scaling MPLS across areas of an autonomous system using labeled interior border gateway protocol 有权
标题翻译：使用标记的内部边界网关协议在自治系统的区域范围内扩展MPLS
公开(公告)号：US08611359B1
公开(公告)日：2013-12-17
申请号：US12626221
申请日：2009-11-25
申请人： Kireeti Kompella , Nischal Sheth , Shivani Aggarwal , Yakov Rekhter
发明人： Kireeti Kompella , Nischal Sheth , Shivani Aggarwal , Yakov Rekhter
IPC分类号： H04L12/28
CPC分类号： H04L45/04 , H04L45/50
摘要： Techniques are described for scaling Multiprotocol Label Switching (MPLS) across areas of an autonomous system using a labeled interior Border Gateway Protocol (iBGP). A method includes executing a first label distribution protocol at a border node at a border between two of a plurality of interior gateway protocol (IGP) areas of a single autonomous system (AS), and exchanging label distribution messages using the first label distribution protocol to establish a first intra-area label switched path (LSP) within a first one of IGP areas. The method also includes executing a labeled interior border gateway protocol at the border node, and exchanging label distribution messages using the labeled interior border gateway protocol to establish a hierarchical inter-area LSP that runs over the previously established first intra-area LSP, wherein the hierarchical inter-area LSP extends across the plurality of IGP areas of the AS.
摘要翻译：描述了使用标记的内部边界网关协议（iBGP）在跨自治系统的区域缩放多协议标签交换（MPLS）的技术。一种方法包括在单个自治系统（AS）的多个内部网关协议（IGP）区域中的两个之间的边界处的边界节点处执行第一标签分发协议，以及使用第一标签分发协议交换标签分发消息，在第一个IGP区域内建立第一个区域内标签交换路径（LSP）。该方法还包括在边界节点处执行标记的内部边界网关协议，并且使用标记的内部边界网关协议来交换标签分发消息，以建立在先前建立的第一区域内LSP上运行的分层区域间LSP，其中，分层区域间LSP跨越AS的多个IGP区域延伸。

3. 发明授权

US08176201B1 Controlling the signaling of label-switched paths using a label distribution protocol employing messages which facilitate the use of external prefixes 有权
标题翻译：使用使用有助于使用外部前缀的消息的标签分发协议来控制标签交换路径的信令
公开(公告)号：US08176201B1
公开(公告)日：2012-05-08
申请号：US10702184
申请日：2003-11-05
申请人： Ina Minei , Nischal Sheth , Pedro R. Marques , Yakov Rekhter
发明人： Ina Minei , Nischal Sheth , Pedro R. Marques , Yakov Rekhter
IPC分类号： G06F15/173 , G06F15/16
CPC分类号： H04L45/04 , H04L45/507
摘要： Label distribution protocol (LDP) signaled label-switched paths (LSPs) are supported without requiring information about remote autonomous systems (ASs) to be injected into the local interior gateway protocol (IGP). This may be done by (i) decoupling a forwarding equivalency class (FEC) element from the routing information, and (ii) specifying a next hop on which the FEC relies. An LDP messaging structure (e.g., an LDP type-length-value (TLV)) that includes a label, FEC information (e.g., a host address or prefix of an egress LSR of the LSP) and a next hop (e.g., a host address or prefix of a border node, such as an AS border router (ASBR)) may be provided. This messaging structure may be included in one or more of (a) label mapping messages, (b) label withdraw messages, and (c) label release messages. If an LDP message including the expanded LDP messaging structure is received at a node, the node may determine whether or not to propagate the LSP using the next hop information, rather than the FEC information. If, on the other hand, the LDP message includes a normal LDP messaging structure, the node may determine whether or not to propagate the LSP as usual.
摘要翻译：支持标签分发协议（LDP）信令的标签交换路径（LSP），而不需要将关于远程自治系统（AS）的信息注入到本地内部网关协议（IGP）中。这可以通过（i）将转发等价类（FEC）元素与路由信息分离，以及（ii）指定FEC所依赖的下一跳来完成。包括标签，FEC信息（例如，LSP的出口LSR的主机地址或前缀）和下一跳（例如，主机）的LDP消息传递结构（例如，LDP类型长度值（TLV））可以提供诸如AS边界路由器（ASBR）之类的边界节点的地址或前缀。这种消息传递结构可以包括在（a）标签映射消息，（b）标签提取消息和（c）标签释放消息中的一个或多个中。如果在节点处接收到包含扩展的LDP消息收发结构的LDP消息，则节点可以使用下一跳信息来确定是否传播LSP，而不是FEC信息。另一方面，如果LDP消息包含正常的LDP消息收发结构，那么该节点可以像往常一样来确定是否传播LSP。

4. 发明授权

US08953446B1 Load balancing multicast join requests over interior and exterior BGP paths in a MVPN 有权
标题翻译：通过MVPN中的内部和外部BGP路径负载平衡组播加入请求
公开(公告)号：US08953446B1
公开(公告)日：2015-02-10
申请号：US13332214
申请日：2011-12-20
申请人： Lili Wang , Rahul Aggarwal , Yakov Rekhter
发明人： Lili Wang , Rahul Aggarwal , Yakov Rekhter
IPC分类号： H04J3/14 , H04L12/28 , H04J3/26 , G06F15/16 , G06F15/173
CPC分类号： H04L12/4641
摘要： A network device receives a join request on a downstream interface, wherein the join request specifies a source device and multicast group, wherein the network device is positioned within a core network of a multicast virtual private network (MVPN) that transmits multicast traffic between the source device and a plurality of receivers associated with customer sites. The network device selects an upstream router to which to send the join request from among a plurality of upstream routers on paths leading to the source device, so as to avoid creating a join request loop in the core network. At least one of the upstream routers is positioned on an Exterior Border Gateway Protocol (EBGP) path toward the source device, and at least one of the upstream routers is positioned on an Interior BGP (IBGP) path toward the source device. The network device sends the join request to the selected upstream device.
摘要翻译：网络设备在下游接口上接收加入请求，其中所述连接请求指定源设备和多播组，其中所述网络设备位于组播虚拟专用网（MVPN）的核心网内，所述多播虚拟专用网（MVPN）在所述源设备和与客户站点相关联的多个接收器。网络设备从通往源设备的路径上从多个上游路由器中选择向其发送加入请求的上游路由器，以避免在核心网络中建立加入请求循环。至少一个上游路由器位于朝向源设备的外部边界网关协议（EBGP）路径上，并且至少一个上游路由器位于朝向源设备的内部BGP（IBGP）路径上。网络设备向所选择的上游设备发送加入请求。

5. 发明授权

US07570605B1 Multicast data trees for multicast virtual private networks 有权
标题翻译：组播虚拟专用网的组播数据树
公开(公告)号：US07570605B1
公开(公告)日：2009-08-04
申请号：US11212500
申请日：2005-08-26
申请人： Rahul Aggarwal , Yakov Rekhter , Anil Lohiya
发明人： Rahul Aggarwal , Yakov Rekhter , Anil Lohiya
IPC分类号： H04L12/28 , H04L12/56
CPC分类号： H04L12/4641 , H04L12/18 , H04L12/1886
摘要： Principles of the invention are described for providing multicast virtual private networks (MVPNs) across a public network that are capable of carrying high-bandwidth multicast traffic with increased scalability. In particular, the MVPNs may transport layer three (L3) multicast traffic, such as Internet Protocol (IP) packets, between remote sites via the public network. The principles described herein may reduce the overhead of protocol independent multicast (PIM) neighbor adjacencies and customer control information maintained for MVPNs. The principles may also reduce the state and the overhead of maintaining the state in the network by removing the need to maintain at least one dedicated multicast tree per each MVPN.
摘要翻译：描述了本发明的原理，用于提供跨越公共网络的多播虚拟专用网络（MVPN），所述组播虚拟专用网络能够承载具有增加的可扩展性的高带宽组播流量。特别地，MVPN可以经由公共网络在远程站点之间传输第三层（L3）组播流量，例如因特网协议（IP）分组。本文所描述的原理可以减少维护MVPN的协议无关组播（PIM）邻居邻居和客户控制信息的开销。这些原理还可以通过消除维护每个MVPN至少一个专用多播树的需要来减少维护网络状态的状态和开销。

6. 发明授权

US07564806B1 Aggregate multicast trees for multicast virtual private networks 有权
标题翻译：组播虚拟专用网聚合组播树
公开(公告)号：US07564806B1
公开(公告)日：2009-07-21
申请号：US11212509
申请日：2005-08-26
申请人： Rahul Aggarwal , Yakov Rekhter
发明人： Rahul Aggarwal , Yakov Rekhter
IPC分类号： H04L12/28 , H04W4/00
CPC分类号： H04L12/4641 , H04L12/18 , H04L12/1886
摘要： Principles of the invention are described for providing multicast virtual private networks (MVPNs) across a public network that are capable of carrying high-bandwidth multicast traffic with increased scalability. In particular, the MVPNs may transport layer three (L3) multicast traffic, such as Internet Protocol (IP) packets, between remote sites via the public network. The principles described herein may reduce the overhead of protocol independent multicast (PIM) neighbor adjacencies and customer control information maintained for MVPNs. The principles may also reduce the state and the overhead of maintaining the state in the network by removing the need to maintain at least one dedicated multicast tree per each MVPN.
摘要翻译：描述了本发明的原理，用于提供跨越公共网络的多播虚拟专用网络（MVPN），所述组播虚拟专用网络能够承载具有增加的可扩展性的高带宽组播流量。特别地，MVPN可以经由公共网络在远程站点之间传输第三层（L3）组播流量，例如因特网协议（IP）分组。本文所描述的原理可以减少维护MVPN的协议无关组播（PIM）邻居邻居和客户控制信息的开销。这些原理还可以通过消除维护每个MVPN至少一个专用多播树的需要来减少维护网络状态的状态和开销。

7. 发明授权

US07522600B1 Transport of control and data traffic for multicast virtual private networks 有权
标题翻译：组播虚拟专用网络的控制和数据流量传输
公开(公告)号：US07522600B1
公开(公告)日：2009-04-21
申请号：US11213636
申请日：2005-08-26
申请人： Rahul Aggarwal , Yakov Rekhter , Anil Lohiya
发明人： Rahul Aggarwal , Yakov Rekhter , Anil Lohiya
IPC分类号： G06F15/16
CPC分类号： H04L12/4641 , H04L12/18 , H04L12/1886
摘要： Principles of the invention are described for providing multicast virtual private networks (MVPNs) across a public network that are capable of carrying high-bandwidth multicast traffic with increased scalability. In particular, the MVPNs may transport layer three (L3) multicast traffic, such as Internet Protocol (IP) packets, between remote sites via the public network. The principles described herein may reduce the overhead of protocol independent multicast (PIM) neighbor adjacencies and customer control information maintained for MVPNs. The principles may also reduce the state and the overhead of maintaining the state in the network by removing the need to maintain at least one dedicated multicast tree per each MVPN.
摘要翻译：描述了本发明的原理，用于提供跨越公共网络的多播虚拟专用网络（MVPN），所述组播虚拟专用网络能够承载具有增加的可扩展性的高带宽组播流量。特别地，MVPN可以经由公共网络在远程站点之间传输第三层（L3）组播流量，例如因特网协议（IP）分组。本文所描述的原理可以减少维护MVPN的协议无关组播（PIM）邻居邻居和客户控制信息的开销。这些原理还可以通过消除维护每个MVPN至少一个专用多播树的需要来减少维护网络状态的状态和开销。

8. 发明授权

US07522599B1 Label switching multicast trees for multicast virtual private networks 有权
标题翻译：为组播虚拟专用网络标签交换组播树
公开(公告)号：US07522599B1
公开(公告)日：2009-04-21
申请号：US11212475
申请日：2005-08-26
申请人： Rahul Aggarwal , Yakov Rekhter , Anil Lohiya
发明人： Rahul Aggarwal , Yakov Rekhter , Anil Lohiya
IPC分类号： H04L12/28 , H04L12/56 , H04L9/00
CPC分类号： H04L12/4641 , H04L12/18 , H04L12/1886
摘要： Principles of the invention are described for providing multicast virtual private networks (MVPNs) across a public network that are capable of carrying high-bandwidth multicast traffic with increased scalability. In particular, the MVPNs may transport layer three (L3) multicast traffic, such as Internet Protocol (IP) packets, between remote sites via the public network. The principles described herein may reduce the overhead of protocol independent multicast (PIM) neighbor adjacencies and customer control information maintained for MVPNs. The principles may also reduce the state and the overhead of maintaining the state in the network by removing the need to maintain at least one dedicated multicast tree per each MVPN.
摘要翻译：描述了本发明的原理，用于提供跨越公共网络的多播虚拟专用网络（MVPN），所述组播虚拟专用网络能够承载具有增加的可扩展性的高带宽组播流量。特别地，MVPN可以经由公共网络在远程站点之间传输第三层（L3）组播流量，例如因特网协议（IP）分组。本文所描述的原理可以减少维护MVPN的协议无关组播（PIM）邻居邻居和客户控制信息的开销。这些原理还可以通过消除维护每个MVPN至少一个专用多播树的需要来减少维护网络状态的状态和开销。

9. 发明申请

US20090080431A1 EDGE DEVICES FOR PROVIDING A TRANSPARENT LAN SEGMENT SERVICE AND CONFIGURATION SUCH EDGE DEVICES 有权
标题翻译：用于提供透明LAN分段服务的边缘设备和配置这样的边缘设备
公开(公告)号：US20090080431A1
公开(公告)日：2009-03-26
申请号：US12329858
申请日：2008-12-08
申请人： Yakov Rekhter
发明人： Yakov Rekhter
IPC分类号： H04L12/56
CPC分类号： H04L12/4641 , H04L12/4645 , H04L45/50 , Y10S707/99936
摘要： A transport LAN segment service is provided over a transport network. The transport network will include edge devices configured to support one or more transparent LAN segments. Configuration is simplified by advertising TLS-port-label information, layer 2 address learning, and multicasting when the needed configuration information has not yet been learned or discovered.
摘要翻译：通过传输网络提供传输LAN段服务。传输网络将包括被配置为支持一个或多个透明LAN段的边缘设备。通过在尚未学习或发现所需配置信息的情况下，通过广告TLS端口标签信息，第2层地址学习和多播来简化配置。

10. 发明授权

US08693487B2 Edge devices for providing a transparent LAN segment service and configuring such edge devices 有权
标题翻译：边缘设备，用于提供透明的LAN段服务和配置这些边缘设备
公开(公告)号：US08693487B2
公开(公告)日：2014-04-08
申请号：US13097168
申请日：2011-04-29
申请人： Yakov Rekhter
发明人： Yakov Rekhter
IPC分类号： H04L12/28
CPC分类号： H04L12/4641 , H04L12/4645 , H04L45/50 , Y10S707/99936
摘要： A transport LAN segment service is provided over a transport network. The transport network will include edge devices configured to support one or more transparent LAN segments. Configuration is simplified by advertising TLS-port-label information, layer 2 address learning, and multicasting when the needed configuration information has not yet been learned or discovered.
摘要翻译：通过传输网络提供传输LAN段服务。传输网络将包括被配置为支持一个或多个透明LAN段的边缘设备。通过在尚未学习或发现所需配置信息的情况下，通过广告TLS端口标签信息，第2层地址学习和多播来简化配置。

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