Summer Classes

Router - Initial Configuration

By Roshan Chaudhary

Lecturer

Islington College

Router Configuration FilesRunning Configuration

• Contains the real-time configuration of the router and changes made

to it. It is present in RAM.

Startup Configuration

• Contains the startup configuration of the router that is required when

the router is powered on. Acts as backup of the configuration. Present

in NVRAM.

Router Configuration Files

• working of configuration files.

CISCO IOS - CLI (Command Line Interface) Modes• In order from top to bottom, the major CLI modes are:

• User Executive mode

• Privileged Executive mode

• Global Configuration mode

• Specific Configuration mode

Router> enable

Router# configure terminal

Router(config)# depends on specific command

CISCO IOS - CLI (Command Line Interface) Modes

Some Useful Cisco Short-cuts

• Tab - Completes the remainder of the command or keyword.

• Ctrl-R - Redisplays a line

• Ctrl-Z - Exits configuration mode and returns to the Exec.

• Down Arrow - Allows user to scroll forward through former

commands.

• Up Arrow - Allows user to scroll backward through former commands.

• Ctrl-Shift-6 - Allows the user to interrupt an IOS process such as Ping or

Traceroute.

• Ctrl-c - Aborts the current command and exits the configuration mode.

Basic Router Configuration

• When configuring a router, certain basic tasks are performed including:

Naming the Router

Setting passwords

Configuring interfaces

Configuring a banner

Saving changes on a Router

Verifying basic configuration and router

operations using SHOW commands

Basic Router Configuration (contd.)Configure IOS Hostname

Router> enable

Router# configure terminal

Router(config)# hostname CoreRouter

Types of Passwords in Cisco:

• Console password: Limits device access using the console connection.

• Vty password: Limits device access using Telnet.

• Enable password: Limits access to the Privileged Exec Mode.

• Enable Secret password: Encrypted, limits access to the Privileged Exec

Mode.

Basic Router Configuration (contd.)Configure Console passwordRouter(config)# line console 0Router(config-line)# password ciscoRouter(config-line)# exec-timeout <time in minutes>Router(config-line)# logging synchronousRouter(config-line)# login

Configure VTY/Telnet passwordRouter(config)# line vty 0 4Router(config-line)# password ciscoRouter(config-line)# exec-timeout <time in minutes>Router(config-line)# logging synchronousRouter(config-line)# login

Basic Router Configuration (contd.)Configure Enable password

Router(config)# enable password cisco

Configure Secret password

Router(config)# enable secret cisco

Enabling Encryption

Router(config)# service password-encryption

Basic Router Configuration (contd.)Configure motd (message of the day) Banner

Router(config)# banner motd $ Unauthorized Access is Strictly

Prohibited $

Basic Router Configuration (contd.)Saving Running-config to Startup-config

Router# wr or

Router# copy running-config startup-config

Assigning IP Address to the Interfaces

Router(config)# interface fastethernet 0/0

Router(config-if)# ip address 192.168.1.1 255.255.255.0

Router(config-if)# no shutdown

Router(config-if)# exit

Syntax: Router(config)# interface <interface-type> <slotnumber/port-

number>

Basic Router Configuration (contd.)Specifying Description for the Interface

Router(config-if)# description This cable is conncted with Block-B

To prevent the router from attempting to resolve typing errors, use

Router# configure terminal

Router(config)# no ip domain-lookup

Router(config)# end

Basic Router Configuration (contd.)Enabling Local Usernames

Router(config)# aaa new-model

Router(config)# username admin password ciscoadmin

Creating Local Usernames without Password

Router(config)# aaa new-model

Router(config)# username Roshan nopassword

Verifying Basic Router Configurationshow version

Verifying Basic Router Configuration (contd.)show flash

Verifying Basic Router Configuration (contd.)Show interfaces

Verifying Basic Router Configuration (contd.)Show ip interface brief

Verifying Basic Router Configuration (contd.)show ip route

show running-config show startup-config