公开(公告)号：US07058010B2

公开(公告)日：2006-06-06

申请号：US09820521

申请日：2001-03-29

申请人： P K Chidambaran ,  Thomas A Hoch ,  John Patrick Jones ,  Andrew A Long ,  Prasasth R Palnati ,  Raymond J Schmidt

发明人： P K Chidambaran ,  Thomas A Hoch ,  John Patrick Jones ,  Andrew A Long ,  Prasasth R Palnati ,  Raymond J Schmidt

IPC分类号： H04L12/26

CPC分类号： H04L45/22 ,  H04L45/16

摘要： The present invention is a methodology for controlled switchover of unicast and multicast data flows in packet based switching system. In some cases it is advantageous to purposefully support switchover of flows from one path to the other without causing loss of data. This is termed a “controlled” or “hitless” switchover. In accordance with the present invention switchover methodology, given that an ingress arbiter device is transmitting to both cores simultaneously, it is required that the flows to both switching cores be synchronized at an aggregator level and that an egress arbiter be given time to cease receiving packets from one Core then switch over to the other Core, and continue receiving packets.

摘要翻译： 本发明是一种在基于分组的交换系统中单播和组播数据流的受控切换的方法。 在某些情况下，有意义地支持流从一个路径切换到另一个路径，而不会导致数据丢失。 这被称为“受控制”或“无控制”切换。 根据本发明的切换方法，考虑到进入仲裁器同时发送到两个核心，要求在两个交换核心上的流量在聚合器级别同步，并且外部仲裁器被给予时间以停止接收分组 从一个Core然后切换到另一个Core，并继续接收数据包。

公开(公告)号：US06894969B1

公开(公告)日：2005-05-17

申请号：US09711997

申请日：2000-11-14

申请人： P K Chidambaran ,  Thomas A Hoch ,  John Patrick Jones ,  Andrew A Long ,  Prasasth R Palnati ,  Ronald M Parker ,  Raymond J Schmidt

发明人： P K Chidambaran ,  Thomas A Hoch ,  John Patrick Jones ,  Andrew A Long ,  Prasasth R Palnati ,  Ronald M Parker ,  Raymond J Schmidt

IPC分类号： H04L12/56 ,  H04J1/16 ,  H04J3/14

CPC分类号： H04L12/5601 ,  H04L49/1523 ,  H04L49/153 ,  H04L2012/5627 ,  H04L2012/5642 ,  H04L2012/5651

摘要： The present invention is a core interface mechanism that permits 1:N type port protection on the core side of the switch such that core bandwidth is not wasted by the direct connection of service cards to the switching core. In an exemplary embodiment, a core interface module supports up to two active service cards and one dedicated protection service card. To provide increased efficiency and lower cost the redundant service card does not strand user bandwidth in the switch core. In an exemplary embodiment, the core interface includes a plurality of core side input and output ports for coupling to the switching core and a plurality of card side input and output ports for coupling to the service cards. A data flow switch function couples between the core side ports and the card side ports. The data flow switch function operates to complete data flow paths between the core side ports and the card side ports. A link failure detector detects a communications failure on a communications link associated with one of the active service cards and alters the data flow switch function such that one or more of said data flow paths associated with one of the active service cards are switched to one of said protection cards. The bandwidth allotment between the service cards and the interface device is generally greater than available bandwidth between the switching core and the interface device, thereby enabling connection of the protection cards without corresponding usage of switching core bandwidth.

摘要翻译： 本发明是一种核心接口机制，其允许在交换机的核心侧进行1：N型端口保护，使得核心带宽不会因为服务卡直接连接到交换核心而浪费。 在示例性实施例中，核心接口模块最多支持两个活动服务卡和一个专用保护服务卡。 为了提供更高的效率和更低的成本，冗余服务卡不会在交换机核心中分组用户带宽。 在示例性实施例中，核心接口包括用于耦合到交换核心的多个核心侧输入和输出端口以及用于耦合到服务卡的多个卡侧输入和输出端口。 数据流切换功能在核心侧端口和卡侧端口之间耦合。 数据流切换功能用于完成核心侧端口和卡侧端口之间的数据流路径。 链路故障检测器检测与一个活动服务卡相关联的通信链路上的通信故障，并改变数据流切换功能，使得与一个活动服务卡相关联的所述数据流路径中的一个或多个切换到 说保护卡。 服务卡和接口设备之间的带宽分配通常大于交换核心和接口设备之间的可用带宽，从而能够连接保护卡而无需相应地使用交换核心带宽。