Cisco Systems 78-11741-02 manual Saving Configuration Changes, Xliv, Building configuration

Using Cisco IOS Software

Saving Configuration Changes

have variables set to certain default values. In these cases, the default form of the command enables the command and sets the variables to their default values. The Cisco IOS software command reference publications describe the effect of the default form of a command if the command functions differently than the no form.

Saving Configuration Changes

Use the copy system:running-config nvram:startup-config command to save your configuration changes to the startup configuration so that the changes will not be lost if the software reloads or a power outage occurs. 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 task saves the configuration to NVRAM. On the Class A Flash file system platforms, this task saves the configuration to the location specified by the CONFIG_FILE environment variable. The CONFIG_FILE variable defaults to NVRAM.

Filtering Output from the show and more Commands

In Cisco IOS Release 12.0(1)T and later releases, you can search and filter the output of show and more commands. This functionality is useful if you need to sort through large amounts of output or if you want to exclude output that you need not see.

To use this functionality, enter a show or more command followed by the “pipe” character (); one of the keywords begin, include, or exclude; and a regular expression on which you want to search or filter (the expression is case-sensitive):

command {begin include exclude} regular-expression

The output matches certain lines of information in the configuration file. The following example illustrates how to use output modifiers with the show interface command when you want the output to include only lines in which the expression “protocol” appears:

Router# show interface include protocol

FastEthernet0/0 is up, line protocol is up

Serial4/0 is up, line protocol is up

Serial4/1 is up, line protocol is up

Serial4/2 is administratively down, line protocol is down

Serial4/3 is administratively down, line protocol is down

For more information on the search and filter functionality, refer to the “Using the Command-Line Interface” chapter in the Cisco IOS Configuration Fundamentals Configuration Guide.

Cisco IOS IP Configuration Guide

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