1. Chapter 2: Basic Router Configuration
Department of Information Technology
ITEC588 – Network Device Configuration
Chapter 2: Basic Router Configuration
Presenter: Dr. Patrick D. Cerna
Asst. Professor :

2. Chapter 2 Objectives Connecting to a Cisco Router
Command Line Interface (CLI)
Administrative functions
Hostnames
Banners
Passwords
Interface descriptions
Verifying your configuration 2

3. Router Access (Connecting to a Cisco Router - 173)
Console port (console)
Rollover cable (each end is a mirror-image o/t other)
RJ-45 to DB-9
RJ-45 to DB-25
Auxiliary port (AUX)
Can function like a console port
Or, can accept modem commands, i.e., from sources outside the network (i.e., “out of band”)
Virtual terminal (VTY)
This is for telnet access
This kind of access is from within the network (i.e., “in band”. 3

4. Connecting To A Cisco Router

5. Setup Mode Basic Management Setup Extended Setup
Command-Line Interface

6. Command-Line Interface (CLI)
More flexible than setup mode.
To use the CLI, just say “No” to entering the initial configuration dialog.
Initial prompt consists of two parts
Hostname
Greater than symbol (>)
p. 179

7. Overview of Router Modes
Global changes:
config terminal or config t
Changes made to running-config (DRAM)
To change the startup-config (NVRAM)
config memory or config mem
Note: Any configuration changes need to be placed into RAM.
Typing “config mem” or “config net” (from a TFTP host) will append the current running-config
p. 1

8. Configuration Modes Global configuration mode Interface mode
Router(config)#
Interface mode
Router(config–if)#
Line configuration mode
Router(config-line)#
Router configuration mode
Router(config-router)# 8

9. Configuration Modes 9

10. Configuration CLI Prompts Interfaces Sub-interfaces Line Commands
Routing Protocol Configurations

11. Administrative Functions
The administrative functions that you can configure on a router and switch are
Hostnames
Banners
Passwords
Interface descriptions

12. Hostnames & Descriptions
Router(config)#hostname haramaya
todd(config)#
Descriptions
Atlanta(config)#int e0
Atlanta(config-if)#description cci_lan

13. Banners Purpose: welcome message Types Delimiting character
exec: set EXEC process creation banner
incoming: set incoming terminal line banner
login: login banner
motd: set “Message of the Day” banner
Delimiting character

14. Banners 14

15. Setting the Passwords 5 passwords:
1st two used to set your enable password
Used to secure privileged mode;
Router>enable
Or Router>en (because no other commands at privileged level begin with “en”
Other three are used to configure a password in user mode via:
console port
auxiliary port
Telnet

16. Passwords Enable passwords Auxiliary Password Console Password
Router(config)#enable password cisco
Router(config)#enable secret cisco
Note: the secret password supersedes the enable password, i.e., if you set both passwords, you will be asked for the secret password.
Auxiliary Password
Console Password
Telnet Password
Encrypting Your Password
Router(config)#service password-encryption

17. Passwords 17

18. Passwords 18

19. Passwords 19

20. Passwords 20

21. Passwords 21

22. Interface Descriptions
Setting descriptions on an interface is helpful to the administrator and, like the hostname, only locally significant. The description command is a helpful one because you can, for instance, use it to keep track of circuit numbers.
Here’s an example:
Atlanta(config)#int e0
Atlanta(config-if)#description Sales Lan
Atlanta(config-if)#int s0
Atlanta(config-if)#desc Wan to Miami circuit:6fdda4321
You can view the description of an interface either with the show running-config command or the show interface command.

23. Router Interfaces Bringing up an Interface
no shutdown
shutdown
show interface
Configuring an IP Address on an Interface
Router(config)#int e0
Router(config-if)#ip address
Router(config-if)#no shut
Serial Interface Commands
clock rate & bandwidth (entered in kilobits)

24. Viewing, & Saving Configurations
running-config saved in DRAM
startup-config saved in NVRAM
copy run start
sh run
sh start
erase startup-config

25. References:
Glen E. Clarke, CompTIA Network+, 4th ed., 2009 Mc Graw Hill
CCNA Exploration, 2006, Cisco Press
Todd Lammle, CCNA Study Guide, 7th Ed., 2009, Sybex 25