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1. Configuring a Router

2. Understanding LED indicators on the
router
•This green light means that the system is on and has
initialized properly.
•An interface LED indicates the activity of the corresponding
interface.
•A problem may be indicated if an LED is off

3. CLI Command Modes

4. Basic Steps to Configure a Router
1. Configure hostname
2. Configure passwords
• Enable / enable secret
• Console
• Virtual terminal (vty)
3. Configure interfaces
4. Configure routing protocol

5. Configuring the Router Hostname
Router#config t
Router(config)#hostname Router_A
Router_A(config)#exit
Router_A#

6. Password Configuration
• Passwords are set for:
– privileged EXEC mode
• Enable password (not used if secret password is
set)
• Enable secret password (restricts going from user to
privileged)
– line passwords
• console interface
• VTY or virtual terminals

7. Password Configuration
• Setting Passwords are set for:
– privileged EXEC mode
• Enable password
– Router(config)#enable password password
• Enable secret password
– Router(config)#enable secret password

8. Password Configuration
• Setting Passwords are set for:
– line passwords
• console interface
– Router(config)#line console 0
– Router(config-line)#password password
– Router(config-line)#login
• VTY or virtual terminals
– Router(config)#line vty 0 4
– Router(config-line)#password password
– Router(config-line)#login

9. Password Configuration
• Password Encryption may set
– The service password-encryption command may
be used to set passwords to not display in clear text
when viewing running configuration.
– Router(config)#line console 0
– Router(config-line)#password password
– Router(config-line)#login
– Router(config-line)#service password-
encryption
– Secret password is always encrypted even when the
command above is not used

10. Password Configuration
If no
password
is set for
virtual
terminal
sessions,
no one
can log
into the
router
using a
virtual
terminal
session

11. show commands
• show interfaces – stats on the router interfaces
• show controllers serial – hardware info re serial
interfaces
• show clock – Shows the time set in the router
• show hosts – Displays a cached list of host names and
addresses
• show users – Displays all users who are connected to
the router
• show history – history of commands
• show flash – info about flash memory and the IOS’s
stored there

12. show commands
• show version – info about router and IOS running in
RAM
• show ARP – Displays the ARP table of the router
• show protocol – Displays the global and interface
specific status of any configured Layer 3 protocols
• show startup-configuration – Displays the saved
configuration located in NVRAM
• show running-configuration – Displays the
configuration currently running in RAM

13. Login Banners
• They are seen by everyone (telnet, AUX port, console
port)
• Can convey message to all users
• Might want to include a warning not to access the
device
• Use a delimiting character before and after
Router#config t
Router(config)#banner motd # Authorized Users Only!!! #