Cisco Router Configuration Example

By | 9th November 2015

This page includes basic feature-by-feature configuration procedures, I must assume you have generated you IP addressing scheme for your network.

After your router boots, the following prompt displays:

Would you like to enter the initial configuration dialog [yes]:

  Enter no.

You want to clear an old configuration out of your router and return it to a factory default configuration. Before you begin your configuration on an old router that you have previously used for another purpose, it is a good idea to completely erase the old configuration:-

Router1#erase startup-config

Erasing the nvram filesystem will remove all files! Continue? [confirm] <enter>


Erase of nvram: complete


Proceed with reload? [confirm] <enter>

After you erase your startup configuration file and reload, the router will enter its configuration dialog mode.

— System Configuration Dialog —

   Would you like to enter the initial configuration dialog? [yes/no]: no

   Would you like to terminate autoinstall? [yes]: yes

   Press RETURN to get started!


There are different modes in Cisco IOS command- line interface, there different mode have their own primary functions and sets of commands.

The first mode you come across is :-

Router> – You are in User EXEC mode

Then type ‘enable’ and hit the enter key

You go to privileged EXEC mode which will display like this:


In this mode you could ask or query (argument) the router for some information like:

Show ? – The router will provide a list of information on its configuration which most times are very helpful.

Type ‘config terminal’ and hit the enter key to take you

into Global configuration mode :-


In this mode:

* you can name your router or hostname

*configure your telnet line and console lines

*Configure the console and telnet passwords.

*Interface configurations, Routing Protocols, etc.

Lets do it one after the other:

Configuring telnet line and password:

Router(config)#enable secret cisco

Router(config)#line vty 0 4

Router(config-line)#password cisco



Configuring console line and password:

Router(config)#line con 0

Router(config-line)#password cisco



Configuring hostname or Router name

Router(config)#hostname HQ


Configuring interfaces connected to the router ports (fast Ethernet / serial ports)

HQ#config t

Enter configuration commands, one per line.  End with CNTL/Z.

HQ(config)#interface fa0/0

HQ(config-if)#ip address

HQ(config-if)#no shut


You may have noticed how the router name has changed from Router to HQ.

Configure the serial port with number depending on the connected port number:-

HQ(config)#interface serial0/0/0

HQ(config-if)#ip address

HQ(config-if)#no shut



Configure the DCE interface (If interface is a DCE) with clock rate:-

HQ(config)#interface serial0/0/0

HQ(config-if)#clock rate 64000



IP Addressing

IP Address Subnetting

IP Routing Protocols

Spanning Tree Protocol – STP Explained

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