GeneralLab Documentation~Cisco Router Configuration Tutorial~08.20.05.pdf

Cisco Router Configuration Tutorial

Cisco Inter-network Operating System:

Cisco IOS Modes of Operation

The Cisco IOS software provides access to several different command modes.

Each command mode provides a different group of related commands.

For security purposes, the Cisco IOS software provides two levels of access to

commands: user and privileged. The unprivileged user mode is called user EXEC

mode. The privileged mode is called privileged EXEC mode and requires a

password. The commands available in user EXEC mode are a subset of the

commands available in privileged EXEC mode.

The following table describes some of the most commonly used modes, how to

enter the modes, and the resulting prompts. The prompt helps you identify which

mode you are in and, therefore, which commands are available to you

Mode of

Operation

Usage

How to Enter the

Mode

Prompt

User EXEC

Change terminal

settings on a temporary

basis, perform basic

tests, and list system

information.

First level accessed.

Router>

Privileged EXEC

System administration,

set operating

parameters.

From user EXEC

mode, enter enable

password command

Router#

Global Config

Modify configuration that

affect the system as a

whole.

From privileged

EXEC, enter

configure terminal .

Router(config)#

Interface Config

Modify the operation of

an interface.

From global mode,

enter interface type

number .

Router(config-if)#

Setup

Create the initial

configuration.

From privileged EXEC

mode, enter

command setup .

Prompted dialog

User EXEC Mode:

When you are connected to the router, you are started in user EXEC mode. The

user EXEC commands are a subset of the privileged EXEC commands.

Privileged EXEC Mode:

Privileged commands include the following:

•

Configure – Changes the software configuration.

•

Debug – Display process and hardware event messages.

•

Setup – Enter configuration information at the prompts.

Enter the command disable to exit from the privileged EXEC mode and return to

user EXEC mode.

Configuration Mode

Configuration mode has a set of submodes that you use for modifying interface

settings, routing protocol settings, line settings, and so forth. Use caution with

configuration mode because all changes you enter take effect immediately.

To enter configuration mode, enter the command configure terminal and exit by

pressing Ctrl-Z .

Note:

Almost every configuration command also has a no form. In general, use the no

form to disable a feature or function. Use the command without the keyword no

to re-enable a disabled feature or to enable a feature that is disabled by default.

For example, IP routing is enabled by default. To disable IP routing, enter the no

ip routing command and enter ip routing to re-enable it.

Getting Help

In any command mode, you can get a list of available commands by entering a

question mark (?).

Router> ?

To obtain a list of commands that begin with a particular character sequence,

type in those characters followed immediately by the question mark (?).

Router# co?

configure connect copy

To list keywords or arguments, enter a question mark in place of a keyword or

argument. Include a space before the question mark.

Router# configure ?

memory

Configure from NV memory

network

Configure from a TFTP network host

terminal

Configure from the terminal

You can also abbreviate commands and keywords by entering just enough

characters to make the command unique from other commands. For example,

you can abbreviate the show command to sh .

Configuration Files

Any time you make changes to the router configuration, you must save the

changes to memory because if you do not they will be lost if there is a system

reload or power outage. There are two types of configuration files: the running

(current operating) configuration and the startup configuration.

Use the following privileged mode commands to work with configuration files.

•

configure terminal – modify the running configuration manually

from the terminal.

•

show running-config – display the running configuration.

•

show startup-config – display the startup configuration.

•

copy running-config startup-config – copy the running

configuration to the startup configuration.

•

copy startup-config running-config – copy the startup

configuration to the running configuration.

•

erase startup-config – erase the startup-configuration in NVRAM.

•

copy tftp running-config – load a configuration file stored on a

Trivial File Transfer Protocol (TFTP) server into the running

configuration.

•

copy running-config tftp – store the running configuration on a

TFTP server.

IP Address Configuration

Take the following steps to configure the IP address of an interface.

Step 1: Enter privileged EXEC mode:

Router> enable password

Step 2: Enter the configure terminal command to enter global configuration

mode.

Router# config terminal

Step 3: Enter the interface type slot/port (for Cisco 7000 series) or interface

type port (for Cisco 2500 series) to enter the interface configuration mode.

Example:

Router (config)# interface ethernet 0/1

Step 4: Enter the IP address and subnet mask of the interface using the ip

address ipaddress subnetmask command.

Example,

Router (config-if)# ip address 192.168.10.1 255.255.255.0

Step 5: Exit the configuration mode by pressing Ctrl-Z

Router(config-if)# [Ctrl-Z]

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