Cisco IOS Router Manuel d'utilisateur télécharger pdf (Page 14)

The Cisco IOS v1.22 – Aaron Balchunas

* * *

Aaron Balchunas (aaron@routeralley.com),

This material may be copied and used freely, but may not be altered or sold without the expressed written

consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.

Managing Configuration Files

Cisco IOS devices employ two distinct configuration files

• running-config – stored in RAM, contains the active configuration

• startup-config – stored in NVRAM (or flash), contains the saved

configuration

Any configuration change made to an IOS device is made to the running-

config. Because the running-config file is stored in RAM, the contents of

this file will be lost during a power-cycle. Thus, we must save the contents

of the running-config to the startup-config file. We accomplish this by using

the copy command from Privileged mode:

Router# copy running-config startup-config

The copy command follows a very specific logic: copy [from] [to]. Thus, if

we wanted to copy the contents of the startup-config file to running-config:

Router# copy startup-config running-config

We can use shortcuts to simplify the above commands:

Router# copy run start

Router# copy start run

To view the contents of the running-config and startup-config files:

Router# show run

Router# show start

To delete the contents of the startup-config file:

Router# erase start

If the router is power-cycled after erasing the startup-config file, the router

will enter Initial Configuration Mode (sometimes called Setup Mode).

This mode is a series of interactive questions intended for quick

reconfiguration of the router.

Initial Configuration Mode can be exited by typing CTRL-C.

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Cisco IOS Router Manuel d'utilisateur Page 14