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Appendix A      Cisco IOS Basic Skills
Using Commands
Using Commands
This section provides some tips about entering Cisco IOS commands at the 
command-line interface (CLI).
Abbreviating Commands
You only have to enter enough characters for the router to recognize the command 
as unique. This example shows how to enter the show version command:
router # sh v
Undoing Commands
If you want to disable a feature or undo a command you entered, you...

 
Appendix A      Cisco IOS Basic Skills
Saving Configuration Changes
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Saving Configuration Changes
You need to enter the copy running-config startup-config command to save 
your configuration changes to nonvolatile RAM (NVRAM) so that they are not 
lost if there is a system reload or power outage. This example shows how to use 
this command to save your changes:
router # copy running-config startup-config
Destination filename...

 
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Appendix A      Cisco IOS Basic Skills
Partition and Squeeze
It might take a minute or two to save the configuration to NVRAM. After the 
configuration has been saved, the following message appears:
Building configuration...
router #
Partition and Squeeze 
Partition and squeeze are supported on Cisco 831, Cisco 837, SOHO 91, and 
SOHO 97 routers. When a Flash memory device is full, you may want to rearrange 
the files so that the space used...

 
Appendix A      Cisco IOS Basic Skills
Summary
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NoteThe squeeze function is applicable only to the Cisco 831, Cisco 837, 
Cisco SOHO 91, and Cisco SOHO 97 routers. 
Summary
Now that you have reviewed some Cisco IOS software basics, you can begin to 
configure your router. Remember the following:
You can use the question mark (?) and arrow keys to help you enter 
commands.
Each command mode restricts you to a set of commands. If you are...

 
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Appendix A      Cisco IOS Basic Skills
Where to Go Next
Where to Go Next
To configure your router, see Chapter 7, “Router Feature Configuration,” and 
Chapter 8, “Advanced Router Configuration.” 

 
Appendix A      Cisco IOS Basic Skills
Where to Go Next
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APPENDIXB
ROM Monitor
This appendix describes the Cisco 820 series routers ROM monitor (also called 
the bootstrap program). The ROM monitor firmware runs when the router is 
powered up or reset. The firmware helps to initialize the processor hardware and 
boot the operating system software. You can use the ROM monitor to perform 
certain configuration tasks, such as recovering a lost password or downloading 
software over the console...

 
Appendix B      ROM Monitor
Entering the ROM Monitor
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Entering the ROM Monitor
To use the ROM monitor, you must be using a terminal or PC that is connected to 
the router over the console port. Refer to the installation chapter in the Cisco 827 
Routers Hardware Installation Guide that came with the router to connect the 
router to a PC or terminal.
Perform these steps to configure the router to boot up in ROM monitor mode the 
next...

 
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Appendix B      ROM Monitor
Entering the ROM Monitor
Who Should Upgrade ROMMON and Why
To ensure proper functionality and prevent router inoperability, upgrade the ROM 
monitor (ROMMON) image to the latest version before downloading the 
Cisco IOS image. The ROMMON images are backward compatible with all 
previously released Cisco IOS software images.
Where to Find New Versions of ROMMON
Go to the following website for a new versions...

 
Appendix B      ROM Monitor
Entering the ROM Monitor
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The parameters have the following meanings.
Step 5Verify parameter settings, using the set command. Correct any errors by 
reentering the parameters and their values. For example:
rommon > set
TFTP_CHECKSUM=0
IP_SUBNET_MASK=255.255.255.0
DEFAULT_GATEWAY=1.6.0.1
TFTP_SERVER=223.255.254.254
IP_ADDRESS=1.6.97.20
TFTP_FILE=/auto/tftpload/ROMMON/C820_RM_ALT.srec.122-1r.XE2
Step 6Upgrade...