配置Cisco EIGRP：增强路由协议详解与命令指南

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"Cisco官方配置手册涵盖了关于如何配置增强内部网关路由协议（EIGRP）的重要步骤。本章内容详尽地解释了EIGRP命令的配置方法，但建议读者查阅《Cisco IOS IP命令参考》第二卷（共三卷）中的“EIGRP命令”章节，以获取完整的命令描述。此外，手册还指出，若在本章中发现其他未提及的命令，可以通过命令参考主索引或在线搜索来查找相应的文档。 EIGRP是由Cisco开发的一种改进版的内部网关路由协议（IGRP），它继承了IGRP的距离向量算法和距离信息。然而，EIGRP在收敛特性及运行效率方面对IGRP进行了显著提升。它的收敛技术基于SRI国际的研究成果，采用了名为扩散算法（Diffusing Update Algorithm）的核心机制，这使得EIGRP在网络拓扑变化时能够更快地调整路由表，提供更高效的服务。配置EIGRP时，不仅限于特定的路由协议，还可能涉及到一些协议独立的功能。这部分内容在手册的“配置IP路由协议独立功能”章节中有详细讲解，这些功能可以与其他网络协议无缝协作，提高网络的整体灵活性和性能。对于支持AppleTalk（一种广域网通信协议）和Novell IPX（Novell网络操作系统使用的网络协议）的EIGRP，读者可以在《Cisco IOS AppleTalk和Novell IPX配置指南》中获取相关的配置指导。学习和操作EIGRP时，理解其原理、掌握相关命令及其背后的收敛技术至关重要。同时，熟悉协议独立功能的配置有助于优化网络架构，确保不同协议间的兼容性和高效路由选择。务必查阅相关文档，以便在实际环境中正确且有效地实施EIGRP配置。"

Configuring EIGRP

EIGRP Configuration Task List

IPC-260

Cisco IOS IP Configuration Guide

Making the Transition from IGRP to EIGRP

If you have routers on your network that are configured for IGRP, and you want to make a transition to

routing EIGRP, you must designate transition routers that have both IGRP and EIGRP configured. In

these cases, perform the tasks as noted in the previous section, “Enabling EIGRP,” and also see the

chapter “Configuring IGRP” in this document. You must use the same autonomous system number in

order for routes to be redistributed automatically.

Logging EIGRP Neighbor Adjacency Changes

By default, the system logs EIGRP neighbor adjacency changes to help you monitor the stability of the

routing system and detect problems. If you disabled logging of such changes and want to reenable the

logging, use the following command in router configuration mode:

Configuring the Percentage of Link Bandwidth Used

By default, EIGRP packets consume a maximum of 50 percent of the link bandwidth, as configured with

the bandwidth interface configuration command. You might want to change that value if a different level

of link utilization is required or if the configured bandwidth does not match the actual link bandwidth

(it may have been configured to influence route metric calculations).

To configure the percentage of bandwidth that may be used by EIGRP on an interface, use the following

command in interface configuration mode:

Adjusting the EIGRP Metric Weights

EIGRP uses the minimum bandwidth on the path to a destination network and the total delay to compute

routing metrics. You can use the eigrp metric weights command to adjust the default behavior of EIGRP

routing and metric computations. For example, this adjustment allows you to tune system behavior to

allow for satellite transmission. EIGRP metric defaults have been carefully selected to provide optimal

performance in most networks.

Note Adjusting EIGRP metric weights can dramatically affect network performance. Because of the

complexity of this task, we recommend that you do not change the default values without guidance

from an experienced network designer.

Command Purpose

Router(config-router)# eigrp log-neighbor-changes

Enables logging of EIGRP neighbor adjacency changes.

Command Purpose

Router(config-if)# ip bandwidth-percent eigrp

percent

Configures the percentage of bandwidth that may be used

by EIGRP on an interface.

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