The router’s actual configuration-which features are enabled and how they are used in your particular network environment-is stored in a configuration file written in IOS’s configuration language. However, the features are not configured in any way. IOS image files contain the system code that your router uses to function, that is, the image contains the IOS itself, plus various feature sets (optional features or router-specific features). Before we discuss how to transfer a new image, let’s define exactly what is meant by an “image file” and how it differs from a configuration file. As we’ll see in this chapter, there are several methods for uploading a new IOS image: the most common include using Trivial File Transfer Protocol (TFTP), Remote Copy Protocol (RCP), or Secure Copy Protocol (SCP). Upgrading IOS involves transferring a new IOS image The IOS (Internetwork Operating System) is the software that resides inside the Cisco device. Chapter 2. IOS Images and Configuration FilesĮventually you will want to upgrade your router’s software.
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