Routers

C H A P T E R

1

Basic Router Configuration
This chapter provides procedures for configuring the basic parameters of your Cisco router, including global parameter settings, routing protocols, interfaces, and command-line access. It also describes the default configuration on startup.

Note

Individual router models may not support every feature described throughout this guide. Features not supported by a particular router are indicated whenever possible. This chapter contains the following sections:
• • • • • • •

Interface Port Labels Viewing the Default Configuration Information Needed for Configuration Configuring Basic Parameters Configuring Static Routes Configuring Dynamic Routes Configuring Enhanced IGRP

Each section includes a configuration example and verification steps, as available. For complete information on how to access global configuration mode, see the “Entering Global Configuration Mode” section in Appendix A, “Cisco IOS Basic Skills.” For more information on the commands used in the following tables, see the Cisco IOS Release 12.3 documentation set.

Interface Port Labels
Table 1-1 lists the interfaces supported for each router and their associated port labels on the equipment.
Table 1-1 Supported Interfaces and Associated Port Labels by Cisco Router

Router Cisco 851

Interface Fast Ethernet LAN Fast Ethernet WAN Wireless LAN

Port Label LAN (top), FE0–FE3 (bottom) WAN (top), FE4 (bottom) (no label)

Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01

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Chapter 1 Viewing the Default Configuration

Basic Router Configuration

Table 1-1

Supported Interfaces and Associated Port Labels by Cisco Router (continued)

Router Cisco 871

Interface Fast Ethernet LAN Fast Ethernet WAN Wireless LAN USB

Port Label FE0–FE3 FE4 LEFT, RIGHT/PRIMARY 1–0 LAN (top), FE0–FE3 (bottom) ADSLoPOTS (no label) LAN (top), FE0–FE3 (bottom) ADSLoISDN LEFT, RIGHT/PRIMARY ISDN S/T LAN...