Upgrading your router's IOS is a critical operation. You need to be careful and cautious with every command you write. Take a look on these hints and tips before you start upgrading.
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Before planning an upgrade or install of an IOS file, you will need to understand the meaning of the name of each IOS file.
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When would you need this: When you want to upgrade the IOS file and you do not have TFTP of FTP servers around, so you turn to the good old console for the upgrade.
Special Requirements: The router flash size should be adequate for the new IOS image, and you should have enough RAM in the router for the operation and temporary storage of the new IOS file.
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When would you need this: If your router flash, or IOS file are corrupted, you can use this procedure to install a new IOS file. Also, when you plan to upgrade your IOS file you can use this procedure.
Special Requirements: The router flash size should be enough for the new IOS file.
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When would you need this: The upgrade is required when you plan to add more duties to the router or new hardware. The installation is required when the IOS image you have on the router is corrupted.
Special Requirements: The router’s flash size should be enough for the new IOS image.