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Basic Software Configuration Using the Cisco IOS Command-Line Interface
This document describes how to use the Cisco IOS command-line interface (CLI) to perform a basic software configuration for your router.

Contents
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Platforms Supported by This Document, page 1 Prerequisites for Basic Software Configuration Using the Cisco IOS CLI, page 2 Restrictions for Basic SoftwareConfiguration Using the Cisco IOS CLI, page 2 How to Perform a Basic Software Configuration Using the Cisco IOS CLI, page 2 Where to Go Next, page 18 Additional References, page 18

Platforms Supported by This Document
Use this document with the following platforms:
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Cisco 1800 series routers Cisco 2800 series routers Cisco 3800 series routers

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Prerequisites for Basic Software Configuration Using the Cisco IOS CLI

Prerequisites for Basic Software Configuration Using the Cisco IOS CLI
Follow the instructions in the quick start guide that shipped with your router to install the chassis, connect cables, and power up therouter.

Timesaver

Before powering up the router, disconnect all WAN cables from the router to keep it from trying to run the AutoInstall process. The router may try to run AutoInstall if you power it on while there is a WAN connection on both ends and the router does not have a valid configuration file stored in NVRAM (for instance, when you add a new interface). It can take several minutesfor the router to determine that AutoInstall is not connected to a remote TCP/IP host.

Restrictions for Basic Software Configuration Using the Cisco IOS CLI
If Cisco Router and Security Device Manager (SDM) is installed on your router, we recommend that you use Cisco SDM instead of the Cisco IOS CLI to perform the initial software configuration. To access SDM, see the quick start guide thatshipped with your router.

How to Perform a Basic Software Configuration Using the Cisco IOS CLI
This section contains the following procedures:
• • • • • • • • • •

Configuring the Router Hostname, page 3 (Optional) Configuring the Enable and Enable Secret Passwords, page 4 (Required) Configuring the Console Idle Privileged EXEC Timeout, page 5 (Optional) Configuring Fast Ethernet and GigabitEthernet Interfaces, page 7 (Required) Specifying a Default Route or Gateway of Last Resort, page 9 (Required) Configuring Virtual Terminal Lines for Remote Console Access, page 11 (Required) Configuring the Auxiliary Line, page 13 (Optional) Verifying Network Connectivity, page 14 (Required) Saving Your Router Configuration, page 16 (Required) Saving Backup Copies of Your Configuration and SystemImage, page 16 (Optional)

Basic Software Configuration Using the Cisco IOS Command-Line Interface

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How to Perform a Basic Software Configuration Using the Cisco IOS CLI

Configuring the Router Hostname
The hostname is used in CLI prompts and default configuration filenames. If you do not configure the router hostname, the router uses the factory-assigned defaulthostname “Router.” Do not expect capitalization and lowercasing to be preserved in the hostname. Uppercase and lowercase characters are treated as identical by many Internet software applications. It may seem appropriate to capitalize a name as you would ordinarily do, but conventions dictate that computer names appear in all lowercase characters. For more information, see RFC 1178, Choosing a Name forYour Computer. The name must also follow the rules for Advanced Research Projects Agency Network (ARPANET) hostnames. They must start with a letter, end with a letter or digit, and have as interior characters only letters, digits, and hyphens. Names must be 63 characters or fewer. For more information, see RFC 1035, Domain Names—Implementation and Specification.

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