公开(公告)号：US07474660B1

公开(公告)日：2009-01-06

申请号：US09283125

申请日：1999-03-31

申请人： Bernie Paul Pearce ,  Claude Alan Cartee

发明人： Bernie Paul Pearce ,  Claude Alan Cartee

IPC分类号： H04L12/28

CPC分类号： H04L45/00 ,  H04L12/4625 ,  H04L29/12028 ,  H04L45/34 ,  H04L45/54 ,  H04L61/103

摘要： The invention solves the problem of maintaining Route information Field (RIF) information in a router for populating the RIF field of packets routed by the router, by storing the RIF information with the Layer 2 address in the address binding table. The address binding table establishes a binding between a Layer 2 address and a Layer 3 address of a station. The Layer 2 address in the address binding table is extended to include the RIF information. The address binding table is normally maintained in the router in an architecture which permits rapid access for fast switching such as cut through routing. A separate RIF cache table, requiring a separate time consuming table look-up is thereby avoided. The address binding table is referred to as the Address Resolution Protocol (ARP) Table in IP protocol. The Layer 2 address is extended to include both MAC address and REF information. The RIF information in the Layer 2 field of the ARP table is updated in response to execution of an ARP Explorer protocol by the router. RIF information is read from an ARP Explorer response packet and written into the Layer 2 field of the ARP table. The Layer 2 address, both MAC address and RIF information, is read from the ARP table for use in populating both the destination address field and the RIF field of a routed packet.

摘要翻译： 本发明解决了在路由器中维护路由信息字段（RIF）信息的问题，通过在地址绑定表中存储具有二层地址的RIF信息来填充由路由器路由的分组的RIF字段。 地址绑定表在站点的二层地址和三层地址之间建立绑定。 地址绑定表中的二层地址扩展为包含RIF信息。 地址绑定表通常在路由器中维护，该架构允许快速访问快速切换，例如切换路由。 因此避免了单独的RIF缓存表，需要单独的耗时的表查找。 地址绑定表称为IP协议中的地址解析协议（ARP）表。 二层地址扩展为包含MAC地址和RIF信息。 响应于路由器执行ARP Explorer协议，ARP表的第2层字段中的RIF信息被更新。 RIF信息从ARP Explorer响应包中读取并写入ARP表的第2层字段。 从ARP表中读取第二层地址（MAC地址和RIF信息），用于填充路由数据包的目的地址字段和RIF字段。

公开(公告)号：US06556574B1

公开(公告)日：2003-04-29

申请号：US09283124

申请日：1999-03-31

申请人： Bernie Paul Pearce ,  Nitin Karkhanis ,  Richard Livingston

发明人： Bernie Paul Pearce ,  Nitin Karkhanis ,  Richard Livingston

IPC分类号： H04L1256

CPC分类号： H04L45/26 ,  H04L1/16 ,  H04L12/462 ,  H04L45/34

摘要： A router transmits an ARP Explorer request packet onto a subnetwork in order to learn the route (RIF information) from the router to an end station. The end station receives a plurality of ARP Explorer request packets from the router because of multiple paths in an SRB network, and the end station transmits an ARP Explorer response packet in response to each ARP Explorer request packet received. The invention adopts the path of the first ARP Explorer response packet received by the router from the end station for the RIF information from the router to the end station, and uses a “duplicate ignore” timer in order to avoid freezing this route into the router tables. The timer begins running upon receipt of the first ARP Explorer response packet, and expires after an “update time interval”. No further ARP Explorer response packet is processed until after expiration of the update time interval.

摘要翻译： 路由器将ARP Explorer请求包发送到子网，以便学习从路由器到终端站的路由（RIF信息）。 终端站由于SRB网络中的多个路径而从路由器接收到多个ARP Explorer请求分组，并且终端站响应于接收到的每个ARP Explorer请求分组而发送ARP Explorer响应分组。 本发明采用路由器从终端接收到的第一个ARP Explorer响应报文，从路由器到终端的RIF信息，并使用“重复忽略”定时器，以避免将该路由冻结到路由器 表。 定时器在收到第一个ARP Explorer响应数据包后开始运行，并在“更新时间间隔”后过期。 在更新时间间隔到期之前，不再处理进一步的ARP Explorer响应数据包。