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Cisco 12000 Series Internet Router Configuration Guide for Cisco IOS Release 12.0S
Chapter 2 Basic Configuration of the Cisco 12000 Series Internet Router
Upgrading and Backing Up Cisco IOS Software Images and Configuration Files
Upgrading the Boot Image in SIMM (Bootflash)
A mini-Cisco IOS software image is preloaded into the single inline memory module (SIMM) or
bootflash. This image can be used to boot the router if there is no other valid image available. It provides
a limited number of configuration commands that you can use to locate a valid Cisco IOS software image
or correct basic configuration problems. This image provides no routing capabilities.
Caution You must have a valid copy of a boot image in the onboard Flash memory SIMM (bootflash) in order to
boot the router. If you delete the current version of the boot image, you must copy in a new image before
you reboot the router.
If it becomes necessary to upgrade this image, download a new image from Cisco.com. Use the
following procedure to upgrade the boot image in the bootflash with the new image:
Note Instead of using the delete and squeeze commands in Step 1 and Step 2, you can use the format
bootflash: command. Note, however, that the format command deletes all crashinfo files located in the
bootflash.
This completes the procedure for upgrading the boot image in the onboard Flash memory SIMM.
Step 1
Router# delete bootflash:gsr-boot-mz.120-8.S
Deletes the current bootflash image from the bootflash. In this
example, the name of the image is gsr-boot-mz.120-8.S. Since
there is generally not enough room in the bootflash for more than
one image, you will need to delete the current image before you
can copy in a new one. If you attempt the copy and there is not
enough room in the bootflash for the image, an error message
will be displayed.
Step 2
Router# squeeze bootflash:
Permanently deletes all files in the bootflash that are marked as
deleted.
Step 3
Router# copy tftp: bootflash:
Begins the copy dialog to copy a file from a TFTP server to the
online Flash memory SIMM (bootflash).
Step 4
Address or name of remote host []? 192.168.16.254
Specifies the address of the TFTP server from which to copy the
Cisco ISO software image.
Step 5
Source filename []? gsr-boot-mz.120-21.S
Specifies the name of the file containing the boot image. In this
example, the file is named gsr-boot-mz.120-21.S.bin.
Step 6
Destination filename [gsr-boot-mz.120-21.S]?
<Return>
Specifies the name of the file to be created on the Flash memory
media. Press Return to use the same name as the source file.
After you enter the name of the destination file, the router begins
to copy the file. When the privileged EXEC prompt is displayed
(Router#), the copy is complete.
Step 7
Router# reload
Reboots the router. The new bootflash image is now ready to
be used.
