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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Upgrading the Cisco IOS Software
Information About Upgrading the System Image
Table 1 describes the slot number and name for the Advanced Capability CF slots.
Table 2 describes the slot number and name for the USB slots.
Information About Upgrading the System Image
To upgrade the system image on your router review the following sections:
• Why Would I Upgrade the System Image?, page 218
• Which Cisco IOS Release Is Running on My Router Now?, page 219
• How Do I Choose the New Cisco IOS Release and Feature Set?, page 219
• Where Do I Download the System Image?, page 219
Why Would I Upgrade the System Image?
System images contain the Cisco IOS software. Your router was shipped with an image installed.
Note The Cisco 1941W access point runs a Cisco IOS image that is separate from the Cisco IOS image on the
router.
At some point, you may want to load a different image onto the router or the access point. For example,
you may want to upgrade your IOS software to the latest release, or you may want to use the same Cisco
IOS release for all the routers in a network. Each system image contains different sets of Cisco IOS
features, therefore select an appropriate system image to suit your network requirements.
Table 1 Compact Flash Slot Numbering and Naming
Slot Number CF Filenames
Slot0
1
1. Slot 0 is the default CF slot. It stores the system image,
configurations, and data files. CF must be present in this slot for the
router to boot and perform normal file operations.
flash0:
2
2. flash0: is aliased to flash:.
Slot1
flash1:
Table 2 USB Slot Numbering and Naming
Slot Number USB Filenames
Slot0
usbflash0:
Slot1
usbflash1:
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