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1. 发明授权

US07599286B2 System and method for achieving path symmetry in an internet protocol (IP) based network 有权
标题翻译：在基于互联网协议（IP）的网络中实现路径对称的系统和方法
公开(公告)号：US07599286B2
公开(公告)日：2009-10-06
申请号：US11069178
申请日：2005-03-01
申请人： Suresh Bhogavilli , Samir Shah , Kaarthik Sivakumar
发明人： Suresh Bhogavilli , Samir Shah , Kaarthik Sivakumar
IPC分类号： H04L12/28 , H04L12/66 , G06F15/16
CPC分类号： H04L45/00 , H04L45/24
摘要： A system and method for improving network performance when communicating between a first site network and a second site network via an IP-based transport network. The site networks include a LAN, a plurality of host/media gateways (MGWs) connected to the LAN, and pairs of first and second Site Edge Routers (SERs) connected to the LAN for handling traffic from different host/MGWs. The SERs are configured as redundant backup pairs in which each SER in a given pair backs up the other SER in the pair. Each SER is connected to a different Provider Edge (PE) router in the transport network via a dedicated link that has sufficient spare capacity to carry traffic coming from both of the SERs in a given pair of SERs in case one of the SERs fails. The SERs provide preferred routing prefixes to the PE routers, thereby guaranteeing symmetric paths for bidirectional traffic.
摘要翻译：一种用于在通过基于IP的传输网络在第一站点网络和第二站点网络之间进行通信时改善网络性能的系统和方法。站点网络包括LAN，连接到LAN的多个主机/媒体网关（MGW）以及连接到LAN的用于处理来自不同主机/ MGW的流量的第一和第二站点边缘路由器（SER）对。 SER被配置为冗余备份对，其中给定对中的每个SER对备份对中的另一个SER。每个SER通过专用链路连接到传输网络中的不同提供商边缘（PE）路由器，专用链路具有足够的备用容量，以在一个SER失败的情况下携带来自给定对SER对中的两个SER的流量。 SER为PE路由器提供优选路由前缀，从而保证双向流量的对称路径。

2. 发明申请

US20070014231A1 Router and method for protocol process migration 有权
标题翻译：用于协议进程迁移的路由器和方法
公开(公告)号：US20070014231A1
公开(公告)日：2007-01-18
申请号：US11182967
申请日：2005-07-15
申请人： Kaarthik Sivakumar , Suresh Bhogavilli , Samir Shah , Christopher Sherwin
发明人： Kaarthik Sivakumar , Suresh Bhogavilli , Samir Shah , Christopher Sherwin
IPC分类号： H04L12/56 , H04L12/28 , H04L12/26 , H04J3/14 , H04J1/16 , H04L1/00
CPC分类号： H04L45/586 , H04L45/04 , H04L45/22
摘要： A router and a method for migrating routing protocol processes or Virtual Routers (VRs) from one Route Processor (RP) to another using graceful restart procedures for maintaining packet flow to the router and assisting the router to obtain restart information. The router includes first and second RPs and a forwarding engine for forwarding packets to neighbor routers in the network. When the routing protocol process is terminated on the first RP, the neighbor routers detect a router failure and initiate the graceful restart procedures. A filter rule in the forwarding engine causes it to forward packets to the new routing protocol process on the second RP. The new process learns the network topology from the neighbor routers, and the migration is completed without packet loss and without requiring complex changes to the network protocol stack.
摘要翻译：路由器和路由协议进程或虚拟路由器（VR）从一个路由处理器（RP）到另一个路由处理器（VR）的方法，使用平稳的重新启动过程将数据包流维护到路由器，并协助路由器获取重启信息。路由器包括第一和第二RP以及用于将分组转发到网络中的邻居路由器的转发引擎。当路由协议进程在第一个RP上终止时，邻居路由器检测到路由器故障，并启动平滑重启过程。转发引擎中的过滤规则使其将数据包转发到第二RP上的新路由协议进程。新进程从相邻路由器学习网络拓扑，并且迁移完成而没有丢包，而不需要对网络协议栈进行复杂的更改。

3. 发明申请

US20060198298A1 System and method for achieving path symmetry in an internet protocol (IP) based network 有权
公开(公告)号：US20060198298A1
公开(公告)日：2006-09-07
申请号：US11069178
申请日：2005-03-01
申请人： Suresh Bhogavilli , Samir Shah , Kaarthik Sivakumar
发明人： Suresh Bhogavilli , Samir Shah , Kaarthik Sivakumar
IPC分类号： H04J3/14 , H04J1/16 , H04L12/26 , H04L1/00 , H04L12/56 , H04L12/28
CPC分类号： H04L45/00 , H04L45/24
摘要： A system and method for improving network performance when communicating between a first site network and a second site network via an IP-based transport network. The site networks include a LAN, a plurality of host/media gateways (MGWs) connected to the LAN, and pairs of first and second Site Edge Routers (SERs) connected to the LAN for handling traffic from different host/MGWs. The SERs are configured as redundant backup pairs in which each SER in a given pair backs up the other SER in the pair. Each SER is connected to a different Provider Edge (PE) router in the transport network via a dedicated link that has sufficient spare capacity to carry traffic coming from both of the SERs in a given pair of SERs in case one of the SERs fails. The SERs provide preferred routing prefixes to the PE routers, thereby guaranteeing symmetric paths for bidirectional traffic.

4. 发明授权

US07583590B2 Router and method for protocol process migration 有权
标题翻译：用于协议进程迁移的路由器和方法
公开(公告)号：US07583590B2
公开(公告)日：2009-09-01
申请号：US11182967
申请日：2005-07-15
申请人： Kaarthik Sivakumar , Suresh Bhogavilli , Samir Shah , Christopher Sherwin
发明人： Kaarthik Sivakumar , Suresh Bhogavilli , Samir Shah , Christopher Sherwin
IPC分类号： H04J1/16 , H04J3/14
CPC分类号： H04L45/586 , H04L45/04 , H04L45/22
摘要： A router and a method for migrating routing protocol processes or Virtual Routers (VRs) from one Route Processor (RP) to another using graceful restart procedures for maintaining packet flow to the router and assisting the router to obtain restart information. The router includes first and second RPs and a forwarding engine for forwarding packets to neighbor routers in the network. When the routing protocol process is terminated on the first RP, the neighbor routers detect a router failure and initiate the graceful restart procedures. A filter rule in the forwarding engine causes it to forward packets to the new routing protocol process on the second RP. The new process learns the network topology from the neighbor routers, and the migration is completed without packet loss and without requiring complex changes to the network protocol stack.
摘要翻译：路由器和路由协议进程或虚拟路由器（VR）从一个路由处理器（RP）向另一个路由处理器（VR）迁移到另一个路由器和方法，使用平稳的重新启动过程来维护到路由器的分组流，并协助路由器获取重启信息。路由器包括第一和第二RP以及用于将分组转发到网络中的邻居路由器的转发引擎。当路由协议进程在第一个RP上终止时，邻居路由器检测到路由器故障，并启动平滑重启过程。转发引擎中的过滤规则使其将数据包转发到第二RP上的新路由协议进程。新进程从相邻路由器学习网络拓扑，并且迁移完成而没有丢包，而不需要对网络协议栈进行复杂的更改。

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