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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
How to Upgrade the Cisco IOS Image
SUMMARY STEPS
1. Select the system image in the Cisco IOS Upgrade Planner at:
http://www.cisco.com/cgi-bin/Software/Iosplanner/Planner-tool/iosplanner.cgi.
2. Write down the minimum memory requirements for the image, as displayed in the File Download
Information table.
3. show version
4. Add the memory sizes that are displayed in the show version command output to calculate your
router’s DRAM size.
5. Compare the calculated DRAM size with the minimum memory requirements from Step 2.
a. If the DRAM is equal to or greater than the new system image’s minimum memory
requirements, proceed to the “Ensuring Adequate Flash Memory for the New System Image”
section on page 223.
b. If the DRAM is less than the new system image’s minimum flash requirements, you must
upgrade your DRAM. See the hardware installation guide for your router.
DETAILED STEPS
Step 1 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.
Step 2 Write down the minimum memory requirements for the image, as displayed in the File Download
Information table.
Step 3 Use the show version command to display the router processor and memory.
Step 4 Add the memory sizes to calculate the amount of DRAM in your router.
For example, if your memory sizes are 231424 KB and 30720 KB for a total of 262144 KB, it would be
256 MB of DRAM.
Tip To convert from kilobytes (KB) to megabytes (MB), divide the number of kilobytes by 1024.
Step 5 Compare the amount of DRAM in the router to the minimum memory requirements from Step 2.
a. If the DRAM is equal to or greater than the new system image’s minimum memory requirements,
proceed to the “Ensuring Adequate Flash Memory for the New System Image” section on page 223.
b. If the DRAM is less than the new system image’s minimum memory requirements, you must
upgrade your DRAM. See the hardware installation guide for your router.
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