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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 a Cisco IOS Software Image on Flash Memory from a TFTP Server
Your router is shipped with a default Cisco IOS software image preloaded into the Flash memory card
or Flash disk located in slot 0 of the RP. As future releases of Cisco IOS software become available, you
can download them from Cisco.com to upgrade your router software. You can save these image files to
a TFTP server on your network and subsequently download them to the routers on your network.
Note Flash memory cards and Flash disks must be formatted before they are used for the first time. If you have
not formatted the Flash memory card or Flash disk, see the “Formatting a Flash Memory Card or Flash
Disk” section on page 2-11.
Note To avoid a situation where the router does not have a valid Cisco IOS software image to boot from, make
sure that you retain the current software image on the Flash memory card or disk. If you do not have
room on the Flash memory card for a second image, save a copy of the image on a separate Flash memory
card or Flash disk, or on a TFTP server on your network. See the “Copying Cisco IOS Software Images
Between Flash Memory Cards or Flash Disks” section on page 2-15.
To upgrade a Cisco IOS software image file on Flash memory from a TFTP server, follow these steps:
Command Purpose
Step 1
Router# show slot0:
Verifies that there is sufficient room on the Flash memory card
or Flash disk to copy the new software image. Default Flash
memory cards are 20M in size. If you see that there is sufficient
room for the image that you are copying, continue with the copy
command in Step 4. Otherwise, continue with the next step.
Step 2
Router# delete slot0:
filename
or
Router# delete disk0:
filename
For Flash memory cards, (slot0: syntax) marks the file filename
to be deleted; for Flash disks, (disk0: syntax) deletes the file
filename. Delete enough files so that there will be sufficient
space on the Flash memory card or Flash disk for the new
software image. If you need the files for future use, be sure to
copy them to another storage media before you delete them.
Step 3
Router# squeeze slot0:
Permanently removes deleted files from a Flash memory card
located in slot 0. The squeeze command also makes all other
undeleted files on the Flash card contiguous. This step is not
required if you are using a Flash disk.
Step 4
Router# copy tftp: slot0:
Begins the copy dialog to copy a file from a TFTP server to a
linear Flash memory card located in slot 0 of the RP. Use slot1:
to copy to a linear Flash memory card in slot 1, disk0: to copy
to a Flash disk in slot 0, and disk1: to copy to a Flash disk in
slot 1.
Step 5
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. The IP address specified here is an
example only.
Step 6
Source filename []? gsr-p-mz.120-7.4.5
Specifies the name of the file containing the Cisco ISO software
image. In this example, the file is named gsr-p-mz.120-7.4.5.
