Technical data

xx Dial Solutions Quick Configuration Guide

Using the No and Default Forms of Commands

For more information regarding command modes, refer to the “Using the Command Line Interface”

chapter of the Conﬁguration Fundamentals Conﬁguration Guide.

Using the No and Default Forms of Commands

Almost every conﬁguration command also has a no form. In general, use the no form to disable a

function. Use the command without the keyword no to reenable a disabled function or to enable a

function that is disabled by default. For example, IP routing is enabled by default. To disable IP

routing, specify the no ip routing command and specify ip routing to reenable it. The Cisco IOS

software command references provide the complete syntax for the conﬁguration commands and

describes what the no form of a command does.

Conﬁguration commands can also have a default form. The default form of a command returns the

command setting to its default. Most commands are disabled by default, so the default form is the

same as the no form. However, some commands are enabled by default and have variables set to

certain default values. In these cases, the default command enables the command and sets variables

to their default values. The Cisco IOS software command references describe what the default form

of a command does if the command is not the same as the no form.

Saving Conﬁguration Changes

Enter the copy system:running-conﬁg nvram:startup-conﬁg command to save your conﬁguration

changes to your startup conﬁguration so that they will not be lost if there is a system reload or power

outage. For example:

Router# copy system:running-config nvram:startup-config

Building configuration...

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

following output appears:

[OK]

Router#

On most platforms, this step saves the conﬁguration to nonvolatile random-access memory

(NVRAM). On the Class A Flash ﬁle system platforms, this step saves the conﬁguration to the

location speciﬁed by the CONFIG_FILE environment variable. The CONFIG_FILE variable

defaults to NVRAM.

ROM monitor From privileged EXEC

mode, use the reload EXEC

command. Press the Break

key during the ﬁrst 60

seconds while the system is

booting.

To exit to user EXEC mode, type continue.

Table 2 Summary of Main Command Modes (Continued)

Command

Mode Access Method Prompt Exit Method