1. Chapter 7.
Working with Router
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2. Chapter Objectives At the end of this Chapter you will be able to:
Identify Console Ports, AUX Port, Hardware Interfaces
Perform Basic configuration of a router
Understand IOS Concepts
Understand router configuration files
Use the CLI to Setup a Basic Router Configuration
Manage CISCO IOS
Manage IOS configuration files
Use basic IOS commands and various modes of router
Understand booting process of a router
Perform basic network configuration and host name
resolution
Identify, prescribe, and select the appropriate media, cables,
ports, and connectors to connect routers to other network
devices and hosts
Connect, configure, and verify operation status of a device
interface
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3. Rear Panel of the Cisco Router
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4. Router Ports
Router ports help to configure the router, verify its configuration and access Cisco IOS

5. Router Ports
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Console Cable

6. Auxiliary Port on a Cisco Router
The purpose of the auxiliary port is for connecting to an external modem. Once configured, this modem can be used as a backup demand-dial connection to another location, or as a way to dial in to the router for troubleshooting purposes
An Auxiliary Port
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7. Router Components
Router components allow the router to enter the boot up process, load its operating system, and configuration files

8. Router Boot Sequence
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9. Router Modes USER Privileged Password New Chapter Enable
Config terminal
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10. 2.Privileged mode (“root”)
1. User mode
User can examine router status and operation.
Configuration cannot be viewed or altered from user mode
Prompt : router>
2.Privileged mode (“root”)
Complete control over the router (anything can be set or reset)
Configuration cannot be altered
Prompt : router#
3.Configuration mode
Used only for change of configuration.
Not password protected from privileged mode.
Privileged mode commands don’t have meaning in configuration
mode.
Most statements can be removed from the configuration with the
prefix no (ex. no shutdown)
Prompt : router(config)#
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11. Summary of Router Modes
Mode Name
Description
Router>
User Mode
Router#
Privileged Mode
Router(config)#
Global configuration mode
Router(config-if)#
Interface mode
Router(config-subif)#
Subinterface mode
Router(config-line)#
Line mode
Router configuration mode
Router(config-router)#
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12. Accessing Help and History
Command
Description ?
Help for all available commands in the mode
Command ?
Describes all the first parameters of the command
com?
Lists the commands that begin with com
command parm?
Lists the characters that begin with parm
command parm<Tab>
When the tab is pressed in between the word, the CLI completes the word. If the CLI is idle, it indicates that the typed characters can form more possible words
command parm1 ?
Lists all the next parameters and their description

13. Enhanced Editing Commands - I
The enhanced editing commands include:
Ctrl + A - Moves the cursor to the beginning of a line
Ctrl+E - Moves the cursor to the end of the line
Esc+B - Move the cursor back by one word
Ctrl+B - Move the cursor back by one character
Ctrl+F - Move the cursor forward by one character
Esc+F - Move the cursor forward by one word
Ctrl+D - Deletes one character
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14. Enhanced Editing Commands - II
Backspace - Deletes one character
Ctrl+R - Recalls a line
Ctrl+U - Deletes a line
Ctrl+W - Deletes a word
Ctrl+Z - Returns to EXEC from the configuration mode
Tab - Finishes typing a word
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15. Router History Commands
Description
Ctrl+P or Up arrow
Displays the last command entered
Ctrl+N or Down arrow
Displays the previously entered commands
show history
Displays the last 10 command entered
show terminal
Displays terminal configuration and size of history buffer
terminal history size
Allows to change the buffer size
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16. Router Administrative Functions
Router administrative functions allow easy troubleshooting and maintenance of routers
Router administrative function include:
Assigning hostname
Assigning banners
setting password
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17. Banners
Banner is a message displayed to all the users when they access the router through Telnet, console and auxiliary ports
It can be used to display information about the router itself or nay kind of security message
Four types of banners available for the Cisco routers are:
Message of the day banner
Exec process creation banner
Incoming terminal line banner
Login banner
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18. Creating a Login Banner
“Login Banner” lets you set the message at the login prompt, you can personalize the message as required time to time.
Command Name
Description
Router(config)#banner login # Authorized Personnel Only! Please enter your username and password. #
Router(config)#
# is known as a “delimiting character”. The delimiting character must surround the banner message and can be any character so long as it is not a character used within the body of the message.
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19. Creating a “Message-of-the-day” Banner
Message of the day (MOTD) is the most extensively used banner. It gives a message to every person dialing into or connecting to the router via Telnet or an auxiliary port, or even through a console port as seen here:
Command Name
Description
Router(config)#banner motd # Building Power will be interrupted next Tuesday evening from 8-10 PM. #
Router(config)#
# is known as a “delimiting character”. The delimiting character must surround the banner message and can be any character so long as it is not a character used within the body of the message.
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20. Basic Router Commands Command Name Description Router#?
Lists all commands available in the current command mode
Router#c?
Clear block
Lists all the possible choices that start with the letter c
Router#cl
clear clock
Lists all the possible choices that start with letter cl
Router#clock
% Incomplete command
Tells you that more parameters need to be entered
Router#clock ?
Set
Shows all subcommands for this command (in this case, Set which sets the time and date)
Router#clock set 19:50:00 14 June ? Enterkey
Pressing the “Enter Key” confirms the time and date configured.
Router#
No error message/Incomplete command message means the command was entered successfully.
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21. Configuring Passwords
Command Name
Description
Router(config)#enable password cisco
Sets enable password
Router(config)#enable enable secret class
Sets enable secret password
Router(config)#line console 0
Enter console line mode
Router(config-line)#password console
Sets console line mode password to console
Router(config-line)#login
Enable password checking at login
Router(config)#line vty 0 4
Enters vty mode for all five vty lines
Router(config-line)#password telnet
Sets vty password to telnet
Enables password checking at login
Router(config)#line aux 0
Enters auxiliary line mode
Router(config-line)#password backdoor
Sets auxiliary password to backdoor
Route(config-line)#login
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22. Password Encryption Command Name Description
Router(config)#service password- encryption
Applies a weak encryption to password
Router(config)#enable password CISCO
Sets password to CISCO
Router(config)#line console 0
Moves to console line mode
Router(config-line)#password Cisco
Continue setting passwords as above
………….
Router(config)#no service password- encryption
Turns off password encryption
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23. Connect, Configure, and Verify the Operational Status of a Device Interface
Introduction
Interface descriptions:
Serial Interface
Fast Ethernet Interface
Moving between Interfaces:
Command Name
Description
Router(config)#interface serial 0/0/0
Moves to serial interface configuration mode
Router(config-if)#exit
Returns to global configuration mode
Router(config)# interface fastethernet 0/0
Moves to Fast Enternet interface configuration mode
Router(config-if)#
In Fast Ethernet 0/0 configuration mode now
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24. Configuring a Serial Interface
Command Name
Description
Router(config)#inteface s0/0/0/0
Moves to serial interface 0/0/0/
Router(config-if)#description Link to ISP
Optional descriptor of the link is locally significant
Router(config-if)# ip address
Assigns address and subnet masks to interface
Router(config-if)#clock rate 56000
Assigns a clock rate for the interface
Router(config-if)#no shutdown
Turns interface on
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25. Configuring a Fast Ethernet
Command Name
Description
Router(config)#inteface 0/0
Moves to Fast Ethernet 0/0 interface configuration mode
Router(config-if)#description ACCOUNTING LAN
Optional descriptor of the link is locally significant
Router(config-if)#ip address
Assigns address and subnet masks to interface
Router(config-if)#no shutdown
Turns interface on
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26. Viewing, Saving, and Erasing Configurations
Saving Configurations
Command Name
Description
Router#copy running-config startup- config
Saves the running configuration to a local NVRAM
Router#copy running-config tftp
Saves the running configuration remotely to a TFTP server
Erasing Configurations
Command Name
Description
Router#erase startup-config
Deletes the startup configuration file from NVRAM
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27. Show Commands Command Name Description Router#show ?
Lists all show commands available.
Router#show version
Displays information about the current Cisco IOS Software
Rotuer#show flash
Displays information about flash memory
Rotuer#show history
Lists all commands in the history buffer
Router#show interface ?
Displays statistics for all interfaces.
Router#show interface serial 0/0/0
Displays statistics for a specific for a specific interface (in this case, serial 0/0/0/)
Router#show interface brief
Displays a summary of al interface, including status and IP address assigned.
Router#show controllers serial 0/0/0
Displays statistics for interface hardware. Statistics display if the clock rate is set and if the cable is DCE, DTE, or not attached.
Router#show clock
Displays time set on device.
Router#show hosts
Displays local host-to-IP address cache. These are the names and addresses of hosts on the network to which you can connect.
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28. Conti.. Router#show users Displays all users connected to device.
Router#show arp
Displays the Address Resolution Protocol(ARP) table.
Router#show protocols
Displays status of configured Layer 3 protocols.
Router#show startup-config
Displays the configuration saved in NVRAM
Router#show running-config
Displays the configuration currently running in RAM
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29. THANK YOU
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