223
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Upgrading the Cisco IOS Software
How to Upgrade the Cisco IOS Image
Ensuring Adequate Flash Memory for the New System Image
This section describes how to check whether your router has enough flash memory to upgrade to the new
system image and, if necessary, how to properly delete files in flash memory to make room for the new
system image.
Cisco 3900 series, Cisco 2900 series, and Cisco 1900 series ISRs have two external CF slots and two
USB slots. Use the secondary CF for overflow files, if required.
lists CF slot number, name, and
size.
lists the USB slot number, name, and size.
Prerequisites
In order to check whether your router has enough flash memory for a new system image, you need to
obtain the image’s flash requirements from Cisco:
•
Choose the Cisco IOS release and system image to which you want to upgrade. See the
About Upgrading the System Image” section on page 218
.
•
Select the system image in the Cisco IOS Upgrade Planner at:
http://www.cisco.com/cgi-bin/Software/Iosplanner/Planner-tool/iosplanner.cgi
.
You must have an account at Cisco.com. If you do not have an account or have forgotten your
username or password, click Cancel at the login dialog box and follow the instructions that appear.
From the File Download Information table, write down the minimum flash requirements for the
image.
Table 3
Compact Flash Slot Number, Name, and Size
Slot Number
CF Filename
Size
1
1.
The maximum storage capacity for the CF in Slot0 and Slot1 is 4GB.
Slot0
2
2.
Slot0 is the default CF slot. CF in Slot0 stores system image, configuration, and
data files. CF must be present in this slot for the router to boot and perform
normal file operations.
flash0:
256MB
Slot1
flash1:
0
Table 4
USB Slot Number, Name, and Size
Slot Number
USB Filename
Size
1
1.
The maximum storage capacity for the USB in Slot0 and Slot1 is 4GB.
Slot0
usbflash0:
64MB
Slot1
usbflash1:
0