翻译CISCO英文文档!急!Introduction This document explains why a Cisco IOS router can experience a not on common subnet error message when the router is configured with Enhanced Interior Gateway Routing Protocol (EIGRP).EIGRP uses multicast hel

翻译CISCO英文文档!急!Introduction This document explains why a Cisco IOS router can experience a not on common subnet error message when the router is configured with Enhanced Interior Gateway Routing Protocol (EIGRP).EIGRP uses multicast hel
翻译CISCO英文文档!急!
Introduction
This document explains why a Cisco IOS router can experience a not on common subnet error message when the router is configured with Enhanced Interior Gateway Routing Protocol (EIGRP).
EIGRP uses multicast hello packets in order to communicate to other EIGRP neighbors. If EIGRP receives a hello packet that is sourced from an IP address on a subnet that is not configured on the EIGRP receiving interface, EIGRP generates this error message:
Prerequisites
Requirements
This document requires a basic understanding of IP routing protocols and EIGRP routing protocol in general. In order to learn more about IP routing protocols and EIGRP, refer to these documents:
Routing Basics
EIGRP Support Page
Components Used
The information in this document is based on Cisco IOS Software Release 12.2(10b) on Cisco 2500 series routers.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
Conventions
Refer to Cisco Technical Tips Conventions for more information on document conventions.
Configure
In this section, you are presented with the information to configure the features described in this document.
Note: Use the Command Lookup Tool ( registered customers only) to find more information on the commands used in this document.
Network Diagram
Cisco recommends that you configure all routers on a network segment with primary IP addresses on the same subnet. This example shows a common EIGRP configuration.

翻译CISCO英文文档!急!Introduction This document explains why a Cisco IOS router can experience a not on common subnet error message when the router is configured with Enhanced Interior Gateway Routing Protocol (EIGRP).EIGRP uses multicast hel
我学过EIGRP,下面是我自己给你翻译了,绝对保证正确,如果你希望深入学习EIGRP,我也可以免费为你翻译哈,
说明
这篇文档解释了,当基于IOS的思科路由器被配置了EIGRP时,其为何会出现“not on common subnet”的错误信息的原因.
EIGRP通过使用组播的hello包来和其邻居进行通信.如果EIGRP收到一个IP地址源自并未在该（运行EIGRP的）接口上配置的子网的hello包,那么EIGRP将会生成这条错误信息：
（朋友您把这里给删除了吧）
预备知识
需求
这个文档需要读者具备基本的IP路由协议知识和一般的EIGRP路由协议.为了学习更多的IP路由协议和EIGRP,请参考这些文档：
路由基础
EIGRP支持页面
需要的组件
文档中的这些信息是基于思科2500系列路由器的IOS软件12.2（10b）版本的.
文档中的这些信息是根据特定实验环境中的设备来创建的.所有在文档中提到的设备都以初始的空白配置为开始的.如果您的网络是在运作使用当中,请确保您能理解这些即将使用的命令的潜在影响.
协议（也就是命令语法约定这些东东）
更多文档的协议信心,请参考思科技术秘诀协议.
配置
在这一章节,为了配置这些在文档中描述的特性,您会得到一些信息.
注意：对于文档提到的命令,请使用命令检索工具（仅对注册用户开放）来找到其更多详细信息.
网络图表（拓扑）
思科推荐您,用统一子网的主IP地址（primary IP addresses）来配置一个网段的所有路由器.
下面这个例子将向您展示一个普通的EIGRP配置.
如果还有疑问,欢迎继续讨论哈.
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P.S.知为得道,不知莫道,现在百度知道的氛围真的让人伤心.