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1. 发明申请

US20050213498A1 Routing system and method for transparently recovering routing states after a failover or during a software upgrade 有权
标题翻译：在故障转移或软件升级之后透明地恢复路由状态的路由系统和方法
公开(公告)号：US20050213498A1
公开(公告)日：2005-09-29
申请号：US10808040
申请日：2004-03-24
申请人： Chandrashekhar Appanna , Ruchi Kapoor , Barry Friedman , Himanshu Shah , Gargi Nalawade , Shyam Suri , John Harper
发明人： Chandrashekhar Appanna , Ruchi Kapoor , Barry Friedman , Himanshu Shah , Gargi Nalawade , Shyam Suri , John Harper
IPC分类号： H04L12/24 , H04L12/26
CPC分类号： H04L45/00 , G06F11/2028 , G06F11/2033 , H04L41/0654 , H04L45/28 , H04L45/58 , H04L45/586
摘要： Methods and apparatus for efficiently enabling routing states to be recovered after a failover or during a software upgrade in a system which supports graceful restart and stateful switchover are disclosed. According to one aspect of the present invention, a method for restarting a network device which has a plurality of routers and is in communication with a first peer being arranged to support graceful restart and a second peer includes performing a graceful restart with respect to the first peer. A peer transparent failover is performed with respect to the second peer. The graceful restart and the peer transparent failover are performed in response to a failure associated with the network device.
摘要翻译：公开了在支持平滑重启和状态切换的系统中，在故障切换或软件升级之后有效地恢复路由状态的方法和装置。根据本发明的一个方面，一种重新启动网络设备的方法，该网络设备具有多个路由器并与第一对等体进行通信，以配置为支持平滑重启和第二对等体包括相对于第一同行相对于第二对等体执行对等体透明的故障转移。响应于与网络设备相关联的故障，执行平滑重启和对等体透明故障转移。

2. 发明申请

US20080031239A1 Techniques for graceful restart in a multi-process operating system 有权
标题翻译：在多进程操作系统中正常重启的技术
公开(公告)号：US20080031239A1
公开(公告)日：2008-02-07
申请号：US11497866
申请日：2006-08-01
申请人： Ruchi Kapoor , Chandrashekhar Appanna , Siva Yaragalla , Lester Bird
发明人： Ruchi Kapoor , Chandrashekhar Appanna , Siva Yaragalla , Lester Bird
IPC分类号： H04L12/56
CPC分类号： H04L45/04 , H04L45/02 , H04L45/56 , H04L69/40
摘要： A method and apparatus is disclosed for graceful restart in a multi-process operating system. A transport protocol process, which is capable of restarting independently from the operating system, is executed in a network element. The network element executes a Border Gateway Protocol (BGP) process, which installs one or more routes in a global Routing Information Base (RIB). When the BGP process detects that the transport protocol process has become unavailable, the BGP process keeps the one or more routes in the global RIB even though the transport protocol process is not available.
摘要翻译：公开了一种用于多进程操作系统中的正常重启的方法和装置。可以在网络元件中执行能够独立于操作系统重新启动的传输协议进程。网络元素执行边界网关协议（BGP）进程，它在全局路由信息库（RIB）中安装一个或多个路由。当BGP进程检测到传输协议进程变得不可用时，即使传输协议进程不可用，BGP进程仍保持全局RIB中的一个或多个路由。

3. 发明授权

US07318108B2 Method and apparatus providing prioritized convergence in border gateway protocol 有权
标题翻译：在边界网关协议中提供优先收敛的方法和装置
公开(公告)号：US07318108B2
公开(公告)日：2008-01-08
申请号：US11023056
申请日：2004-12-22
申请人： Arjun Sreekantiah , Ruchi Kapoor , Keyur Patel , Robert Raszuk
发明人： Arjun Sreekantiah , Ruchi Kapoor , Keyur Patel , Robert Raszuk
IPC分类号： G06F15/173
CPC分类号： H04L45/02 , H04L45/04
摘要： A method is disclosed for providing prioritized routing table convergence in Border Gateway Protocol (BGP) hosts, as part of a BGP process that is executed by a route processor in a network, wherein the processor hosts a plurality of BGP routing tables each associated with a specified sub-address family (SAFI). A convergence priority order value is created and stored in association with each routing table. As part of performing a convergence phase of BGP processing, the convergence priority order value of each routing table is obtained. The convergence phase is then performed for the routing tables only according to an order that is represented by the convergence priority order values. Therefore, convergence proceeds more quickly and values needed by other routing processes become available earlier.
摘要翻译：公开了一种用于在边界网关协议（BGP）主机中提供优先级路由表收敛的方法，作为由网络中的路由处理器执行的BGP进程的一部分，其中处理器承载多个BGP路由表，每个BGP路由表与指定的子地址族（SAFI）。与每个路由表相关联地创建和存储收敛优先级顺序值。作为执行BGP处理收敛阶段的一部分，获得每个路由表的收敛优先级顺序值。然后，仅根据由收敛优先级顺序值表示的顺序为路由表执行收敛阶段。因此，收敛进展得更快，其他路由进程所需的值越来越早。

4. 发明授权

US08174964B2 Detecting unavailable network connections 有权
标题翻译：检测不可用的网络连接
公开(公告)号：US08174964B2
公开(公告)日：2012-05-08
申请号：US12976923
申请日：2010-12-22
申请人： Mitesh Dalal , Anantha Ramaiah , Ruchi Kapoor , Chandrashekhar Appanna
发明人： Mitesh Dalal , Anantha Ramaiah , Ruchi Kapoor , Chandrashekhar Appanna
IPC分类号： H04L1/22
CPC分类号： H04L67/1048 , H04J3/14 , H04L1/187 , H04L45/02 , H04L45/22 , H04L45/28 , H04L45/586 , H04L67/104 , H04L67/1095 , H04L67/14 , H04L69/14 , H04L69/16 , H04L69/40
摘要： A method for detecting unavailable network connections comprises, at a first data processing node that is hosting a transport protocol connection that uses a plurality of sequence values to identify messages sent to a peer node, wherein the first node is communicatively coupled to a second data processing node serving as a redundant backup, periodically sending a checkpoint sequence value to the second node; detecting that either the transport protocol connection or a process using the transport protocol connection is unavailable, without use of a timeout; and in response thereto, sending a notification to the peer node, wherein the notification includes the checkpoint sequence value. One embodiment provides for rapidly detecting and responding to failure of a TCP process without using long timeouts as conventionally provided in long-lived applications that run on top of TCP.
摘要翻译：一种用于检测不可用网络连接的方法包括：在承载使用多个序列值以识别发送到对等节点的消息的传输协议连接的第一数据处理节点处，其中所述第一节点通信地耦合到第二数据处理节点用作冗余备份，周期性地向第二节点发送检查点序列值; 检测传输协议连接或使用传输协议连接的进程不可用，而不使用超时; 并且响应于此，向所述对等节点发送通知，其中所述通知包括所述检查点序列值。一个实施例提供了快速检测和响应TCP过程的故障，而不需要在TCP上运行的长寿命应用程序中常规提供的长时间超时。

5. 发明授权

US07940649B2 Techniques for graceful restart in a multi-process operating system 有权
标题翻译：在多进程操作系统中正常重启的技术
公开(公告)号：US07940649B2
公开(公告)日：2011-05-10
申请号：US11497866
申请日：2006-08-01
申请人： Ruchi Kapoor , Chandrashekhar Appanna , Siva Yaragalla , Lester Bird
发明人： Ruchi Kapoor , Chandrashekhar Appanna , Siva Yaragalla , Lester Bird
IPC分类号： G01R31/08 , H04J1/16 , H04L1/00 , H04L12/28
CPC分类号： H04L45/04 , H04L45/02 , H04L45/56 , H04L69/40
摘要： A method and apparatus is disclosed for graceful restart in a multi-process operating system. A transport protocol process, which is capable of restarting independently from the operating system, is executed in a network element. The network element executes a Border Gateway Protocol (BGP) process, which installs one or more routes in a global Routing Information Base (RIB). When the BGP process detects that the transport protocol process has become unavailable, the BGP process keeps the one or more routes in the global RIB even though the transport protocol process is not available.
摘要翻译：公开了一种用于多进程操作系统中的正常重启的方法和装置。可以在网络元件中执行能够独立于操作系统重新启动的传输协议进程。网络元素执行边界网关协议（BGP）进程，它在全局路由信息库（RIB）中安装一个或多个路由。当BGP进程检测到传输协议进程变得不可用时，即使传输协议进程不可用，BGP进程仍保持全局RIB中的一个或多个路由。

6. 发明授权

US07903546B2 Detecting unavailable network connections 有权
标题翻译：检测不可用的网络连接
公开(公告)号：US07903546B2
公开(公告)日：2011-03-08
申请号：US11036191
申请日：2005-01-14
申请人： Mitesh Dalal , Anantha Ramaiah , Ruchi Kapoor , Chandrashekhar Appanna
发明人： Mitesh Dalal , Anantha Ramaiah , Ruchi Kapoor , Chandrashekhar Appanna
IPC分类号： H04L1/22
CPC分类号： H04L67/1048 , H04J3/14 , H04L1/187 , H04L45/02 , H04L45/22 , H04L45/28 , H04L45/586 , H04L67/104 , H04L67/1095 , H04L67/14 , H04L69/14 , H04L69/16 , H04L69/40
摘要： A method for detecting unavailable network connections comprises, at a first data processing node that is hosting a transport protocol connection that uses a plurality of sequence values to identify messages sent to a peer node, wherein the first node is communicatively coupled to a second data processing node serving as a redundant backup, periodically sending a checkpoint sequence value to the second node; detecting that either the transport protocol connection or a process using the transport protocol connection is unavailable, without use of a timeout; and in response thereto, sending a notification to the peer node, wherein the notification includes the checkpoint sequence value. One embodiment provides for rapidly detecting and responding to failure of a TCP process without using long timeouts as conventionally provided in long-lived applications that run on top of TCP.
摘要翻译：一种用于检测不可用网络连接的方法包括：在承载使用多个序列值以识别发送到对等节点的消息的传输协议连接的第一数据处理节点处，其中所述第一节点通信地耦合到第二数据处理节点用作冗余备份，周期性地向第二节点发送检查点序列值; 检测传输协议连接或使用传输协议连接的进程不可用，而不使用超时; 并且响应于此，向所述对等节点发送通知，其中所述通知包括所述检查点序列值。一个实施例提供了快速检测和响应TCP过程的故障，而不需要在TCP上运行的长寿命应用程序中常规提供的长时间超时。

7. 发明申请

US20110093591A1 Detecting Unavailable Network Connections 有权
标题翻译：检测不可用的网络连接
公开(公告)号：US20110093591A1
公开(公告)日：2011-04-21
申请号：US12976923
申请日：2010-12-22
申请人： Mitesh Dalal , Anantha Ramaiah , Ruchi Kapoor , Chandrashekhar Appanna
发明人： Mitesh Dalal , Anantha Ramaiah , Ruchi Kapoor , Chandrashekhar Appanna
IPC分类号： G06F15/173
CPC分类号： H04L67/1048 , H04J3/14 , H04L1/187 , H04L45/02 , H04L45/22 , H04L45/28 , H04L45/586 , H04L67/104 , H04L67/1095 , H04L67/14 , H04L69/14 , H04L69/16 , H04L69/40
摘要： A method for detecting unavailable network connections comprises, at a first data processing node that is hosting a transport protocol connection that uses a plurality of sequence values to identify messages sent to a peer node, wherein the first node is communicatively coupled to a second data processing node serving as a redundant backup, periodically sending a checkpoint sequence value to the second node; detecting that either the transport protocol connection or a process using the transport protocol connection is unavailable, without use of a timeout; and in response thereto, sending a notification to the peer node, wherein the notification includes the checkpoint sequence value. One embodiment provides for rapidly detecting and responding to failure of a TCP process without using long timeouts as conventionally provided in long-lived applications that run on top of TCP.
摘要翻译：一种用于检测不可用网络连接的方法包括：在承载使用多个序列值以识别发送到对等节点的消息的传输协议连接的第一数据处理节点处，其中所述第一节点通信地耦合到第二数据处理节点用作冗余备份，周期性地向第二节点发送检查点序列值; 检测传输协议连接或使用传输协议连接的进程不可用，而不使用超时; 并且响应于此，向所述对等节点发送通知，其中所述通知包括所述检查点序列值。一个实施例提供了快速检测和响应TCP过程的故障，而不需要在TCP上运行的长寿命应用程序中常规提供的长时间超时。

8. 发明申请

US20060245374A1 Method to scale hierarchical route reflectors using automated outbound route filtering-list mechanism 有权
标题翻译：使用自动出站路由过滤列表机制来分级路由反射器的方法
公开(公告)号：US20060245374A1
公开(公告)日：2006-11-02
申请号：US11117223
申请日：2005-04-28
申请人： Keyur Patel , Ruchi Kapoor , James Guichard
发明人： Keyur Patel , Ruchi Kapoor , James Guichard
IPC分类号： H04L12/28 , H04L12/56
CPC分类号： H04L45/04 , H04L45/02
摘要： A method, apparatus and computer program product for scaling hierarchical route reflectors (RRs) using automated Outbound Route Filtering (ORF) is presented. A first route reflector identifies other route reflectors configured as Route reflector clients within a route reflector hierarchy. The first route reflector then builds a common set of route target filters received from the client route reflectors and sends the common set of route target filters to client route reflectors.
摘要翻译：提出了一种使用自动出站路由过滤（ORF）来缩放分层路由反射器（RR）的方法，设备和计算机程序产品。第一个路由反射器标识在路由反射器层次结构中被配置为路由反射器客户端的其他路由反射器。然后，第一个路由反射器构建从客户端路由反射器接收的一组通用路由目标过滤器，并将通用的路由目标过滤器集合发送到客户端路由反射器。

9. 发明申请

US20060007851A1 Rapid protocol failure detection 有权
公开(公告)号：US20060007851A1
公开(公告)日：2006-01-12
申请号：US10888122
申请日：2004-07-09
申请人： Chandrashekhar Appanna , Anantha Ramaiah , Ruchi Kapoor
发明人： Chandrashekhar Appanna , Anantha Ramaiah , Ruchi Kapoor
IPC分类号： H04L12/26
CPC分类号： H04L41/06 , H04L43/0811 , H04L45/00 , H04L45/04 , H04L45/22 , H04L45/28 , H04L67/14 , H04L69/16 , H04L69/163 , H04L69/40
摘要： A method is disclosed for rapidly detecting a protocol failure. In one embodiment, the method includes receiving an indication that a first process has failed. The first process having been engaged in communications over one or more network connections with a second process. A packet is formed, such that the packet appears to have been formed by the first process. The packet includes one or more data values, which, when received and processed by the second process, will cause the second process to close the network connection. The packet is sent to the second process. When the second process receives the packet, the second process to closes the network connection.

10. 发明授权

US07688714B2 Network routing apparatus that performs soft graceful restart 有权
标题翻译：执行软平滑重启的网络路由设备
公开(公告)号：US07688714B2
公开(公告)日：2010-03-30
申请号：US11395986
申请日：2006-03-30
申请人： Gargi Nalawade , Keyur Patel , Ruchi Kapoor
发明人： Gargi Nalawade , Keyur Patel , Ruchi Kapoor
IPC分类号： G01R31/08 , G06F11/00 , G08C15/00 , H04J1/16 , H04J3/14 , H04L1/00 , H04L12/26 , H04L12/28 , H04L12/56 , G06F15/173
CPC分类号： H04L45/28 , H04L45/02 , H04L45/52 , H04L45/563
摘要： A network data packet routing apparatus with BGP is configured to soft reset an AFI or SAFI, so that forwarding on routes associated with the AFI or SAFI can continue even after an event or error. One approach involves establishing a Border Gateway Protocol (BGP) peering session between a first node and a second node in a packet-switched network; detecting a BGP condition requiring a reset of a BGP address family indicator (AFI) data structure or a sub-address family indicator (SAFI) data structure, wherein the BGP condition does not affect states of routes in the AFI or SAFI; preserving a BGP state and a forwarding state of the AFI or SAFI; and forwarding data on routes represented in the AFI or SAFI. Soft notification messaging and marking routes as stale facilitates the approach.
摘要翻译：具有BGP的网络数据分组路由设备被配置为软复位AFI或SAFI，使得即使在事件或错误之后，与AFI或SAFI相关联的路由上的转发也可以继续。一种方法涉及在分组交换网络中的第一节点和第二节点之间建立边界网关协议（BGP）对等体会话; 检测需要复位BGP地址族指示符（AFI）数据结构或子地址族指示符（SAFI）数据结构的BGP条件，其中BGP条件不影响AFI或SAFI中的路由状态; 保持BGP状态和AFI或SAFI的转发状态; 并转发AFI或SAFI所代表的路由数据。软通知消息和标记路由为陈旧方便。

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