1. Cisco Router MODES Configuration Prompt Interface Router(config-if)#
Line Router(config-line)#
Router Router(config-router)#
Route-map Router(config-route-map)#
All of these commands are done in the ‘Global Configuration Mode’.
Type exit from one of these specific configuration modes to return to global configuration mode
Type Ctrl-Z to return to privileged EXEC mode

2. Configure a Router Hostname : Router> enable
Router# configure terminal
Router(config)#
hostname Tokyo
Tokyo(config)#

3. Configure a Router - Passwords
Configure Console password :
Router(config)#
line console 0
Router(config-line)#
login
Router(config-line)#
password cisco
Configure Virtual terminal :
Router(config)#
line vty 0 4
Router(config-line)#
login
Router(config-line)#
password cisco

4. Configure a Router - Passwords
Configure enable password:
Router(config)#
enable password password
Configure secret password
Router(config)#
enable secret password
NOTE: “enable secret” has preference over “enable password”

5. Configure a Router – Show commands
We may compile a list of “show” commands to help debug the router. Some of these commands are:
show interface
show interface serial port
show version
show protocol
show startup-configuration
show running-configuration

6. Configure a Router - Interfaces
In the following commands, type, refers to either, ethernet, or serial ports.
Router(config)#
interface type port OR
Router(config)#
interface type slot/port
To bring a port down, or ‘shut it down’:
Router(config)#
interface type port
Router(config-if)#
shutdown
To bring ‘up’ an interface or ‘initialize’ it:
Router(config)#
interface type port
Router(config-if)#
no shutdown

7. Configure a Router – Interfaces (cont.)
Example:
Router(config)# interface serial 1
Router(config-if)# no shutdown
Router(config)# interface serial 1/0
Router(config-if)# no shutdown
Router(config)# interface ethernet0
Router(config-if)# no shutdown

8. Configure a Router – Interfaces (cont.)
By default, the interfaces are ‘down’
Before one does a ‘no shutdown’, all interfaces are in the state:
administrative down, line protocol down

9. Configure a Router – Interfaces (cont.)
When you are at interface mode, you need to give characteristics to the ethernet or serial port:
Router(config)#
interface serial 0/0
Router(config-if)#
ip address <ip address> <netmask>
If the serial port is the DCE, then the clock rate must be applied:
Router(config)#
interface serial 0/0
Router(config-if)#
ip address <ip address> <netmask>
Router(config-if)#
clock rate 56000
Router(config-if)#
no shutdown

10. Configure a Router - Interfaces (cont.)
When you are at interface mode, you need to give characteristics to the ethernet or serial port:
Router(config)# interface serial 0
Router(config-if)#
ip address
If the serial port is the DCE, then the clock rate must be applied:
Router(config)#
interface serial 0/0
Router(config-if)#
ip address
Router(config-if)#
clock rate 56000
Router(config-if)#
no shutdown

11. Configure a Router – erase configuration
To erase the configuration of a router:
Router#
erase startup-config
Router#
reload
To load the running configuration of a router into NVRAM, do:
Router#
copy running-config startup-config
There are some ‘bad’ results with ‘start’ if you misspell ‘start’. So use
wr memory

12. Configure a Router Give a description to an interface: Router(config)#
interface e0
Router(config-if)#
description CET LAN, Bldg 19
Give a message of the day (MOTD):
Router(config)#
banner motd #You have entered a secure area! #

13. Configure a Router – ip host command
Give host name resolution, or a mini-DNS table, do:
Router(config)# ip host Auckland
Router(config)# ip host Beirut
Router(config)# ip host Dallas

14. Configure a Router London Paris e1 s0 e0 s1 e0 e1 175.11.11.1 e1 s0 e0 s1
London
Paris e0 e1
Router(config)# hostname London
London(config)# ip host Paris
Router(config)# hostname Paris
Paris(config)# ip host London
These ping commands would give you the same results
London# ping
London# ping Paris
These ping commands would give you the same results
Paris# ping
Paris# ping Paris

15. Configure a Router To copy information from one place to another:
Router# copy <from file> <to file>
Router#copy running-config startup-config
Router#copy running-config tftp
Router#copy tftp startup-config

16. Standards
It’s important to create a standard for networking consistency to alleviate router configuration by:
reducing complexity
limiting unplanned downtime
limiting events that may impact network performance