Router Configuration Itcn
Transcript of Router Configuration Itcn
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Configuring a Router
MM Clements
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This Week
Command line interface
Router configuration Modes for configuration
Interface configuration
Working with configurations using PacketTracer 5.x
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Conventions used in these notes
All commands e.g. enable will use Courier
font to distinguish them from text After each command has been entered you
should press Enter (Return)
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Cisco IOS
Internetwork Operating System
Accessed via command line only No GUI makes for increased OS reliability
and lower hardware requirements
Has modes for operation unlike Linux or DOS
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Command-Line Interface Modes
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Global Configuration Modes
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Initial login to a router
Power up router
System information displayed Begins in User Executive mode
Users can do little (damage!) here
Enter Privileged Executive mode withenable command
May be password protected
User will be prompted if necessary
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Router Boot Process
Router decompresses IOS image from Flash
memory Legal information is displayed
On first ever ( or clean ) boot, user is asked
whether or not to enter configuration
dialogue
This is for non-Cisco educated people
answer n ( for NO )
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System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1)
Copyright (c) 2000 by cisco Systems, Inc.
cisco 2620 (MPC860) processor (revision 0x200) with 60416K/5120K bytes of
memory
Self decompressing the image :#########################################################################
# [OK]
Restricted Rights Legend
Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706
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Clean Boot Continued--- System Configuration Dialog ---
Continue with configuration dialog? [yes/no]: n
Press RETURN to get started!
Router>?
Exec commands:
Session number to resume
connect Open a terminal connection
disable Turn off privileged commands
disconnect Disconnect an existing network connection
enable Turn on privileged commands
Etc. etc.
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Learning the Commands
Unlike Linux and DOS, all commands
available can be accessed using a questionmark ( ? ) displays minor help too
This allows all or partially typed commands
to be shown
E.g. to show all commands that begin with
the letter c type c? at the prompt and
press enter (return)
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Getting Going
In User Exec the prompt is Router>
From User Exec proceed to Privileged Execusing the enable command
Now you are in Privileged Exec the prompt isRouter#
This mode allows many parameters of the
router to be viewed
These can be seen using a show command
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Examining the show Commands
There are many show commands that
display the settings for the router Also useful for troubleshooting
In both Privileged EXEC and User EXECmodes, the command show ? provides a list
of available show commands
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Making Changes to the Router
To change settings you need to enter Global
Configuration mode This can be achieved using the configure
terminal command
The prompt now changes to Router(config)#
A different set of commands are now available
Many configuration modes exist too
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Configuring a Router Name
A router should have a name to allow it to be
easily identified The location is a good choice but any name
can be set
Router(config)#hostname Chatham
Chatham(config)#
The routers security should be considered too
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Router Identification Configuration
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Password Configuration
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Configuring an Ethernet Interface
1. Enter global configuration mode
2. Enter interface configuration mode3. Specify the interface address and subnet
mask
4. Enable the interface
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Setting FastEthernet Interface
Router(config)#interface FastEthernet 0/0
Router(config-if)#ip address 192.168.1.1
255.255.255.0
Router(config-if)#no shutdown
%LINK-5-CHANGED: InterfaceFastEthernet0/0, changed state to up
Router(config-if)#
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What interfaces does the router have?
You need to use a show command
show ip interface brief will list allinterfaces of the router
The names of the interfaces must be entered
to make changes to the interfaces of the
router
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Router#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES unset administratively down down
FastEthernet0/1 unassigned YES unset administratively down down
Serial0/0 unassigned YES unset administratively down down
Serial0/1 unassigned YES unset administratively down down
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Interface Configuration Commands
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Interface Descriptions
An interface description should be used to identify
important information such as a distant router, a
circuit number, or a specific network segment.
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Adds, Moves, and Changes
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Finishing the Configuration
Once finished you should type the exit
command to return one step back in the
command mode structure
To immediately return to Priv Exec, type theendcommand
Now you need to save the configuration or ifpower is lost, the configuration is lost
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Saving the Configuration
When in Global Config mode, you are writing
directly to DRAM
The contents of DRAM can be accessed usingthe running-config file but are lost if the
power is turned off
The Priv Exec command copy running-config startup-config saves the contents
of DRAM to NVRAM for the next reboot
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Checking you have saved properly
After issuing the copy running-config
startup-config hcommand the router
displays the following
Router#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...[OK]
Router#
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Rebooting the router
At Priv Exec prompt, issue the reload
command and confirm (Enter)
The router restarts but no longer displays the
same question about initial configuration
You should be able see all of the information
that you entered when in Priv Exec again
Type the show running-config
command and examine the output
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Conclusion
Cisco IOS allows command line modification
A ? allows commands to be displayed CLI has modes for configuration
Need to be in the right mode to make
changes
running-config file is the contents of DRAM
startup-config file is used to store routers
configuration for the next boot