IOS Packaging
Cisco builds the Cisco Internetwork Operating System (IOS) software as a single file. Using a single file makes installation of a new IOS simple: You download the one file from Cisco, copy it to flash memory on the router, and then take steps to make sure the router boots the next time using the new IOS image. You learned the details of this process in Chapter 20, “Managing IOS Files.”
Cisco continues to build the IOS as a single file today, but they have changed what they include in the IOS image files. This section looks at both the old and new methodologies for constructing images. This chapter also covers the new IOS licensing features that enable a router to use different parts of the IOS.
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