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Software Configuration Guide For Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers

OL-1957-03

Chapter 1 Understanding Interface Numbering and Cisco IOS Software Basics

Upgrading to a New Cisco IOS Release

Note You can press Ctrl-z in any mode to immediately return to enable mode (Router#), instead of

entering exit, which returns you to the previous mode.

Undoing a Command or Feature

If you want to undo a command you entered or disable a feature, enter the keyword no before most

commands; for example, no ip routing.

Saving Configuration Changes

You need to enter the copy running-config startup-config command to save your configuration changes

to nonvolatile random-access memory (NVRAM), so the changes are not lost if there is a system reload

or power outage. For example:

Router# copy running-config startup-config

Building configuration...

It might take a minute or two to save the configuration to NVRAM. After the configuration has been

saved, the following appears:

[OK]

Router#

Upgrading to a New Cisco IOS Release

To install or upgrade to a new Cisco IOS release, refer to Appendix B, “Formatting the Compact Flash

Memory Cards.”

Where to Go Next

Now that you have learned some Cisco IOS software basics, you can begin to configure the router using

the CLI.

Remember that:

• 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 have difficulty entering a command,

check the prompt and then enter the question mark (?) for a list of available commands. You might

be in the wrong command mode or using the wrong syntax.

• To disable a feature, enter the keyword no before the command; for example, no ip routing.

• You need to save your configuration changes to NVRAM so the changes are not lost if there is a

system reload or power outage.

Proceed to Chapter 2, “Using the Setup Command Facility,” to begin configuring the router.

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