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11: Cisco IOS Software
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Once you power on your Cisco device, hardware tests are performed to ensure that it is operating correctly These tests, power-on self tests (POSTs), are discussed in s 12 (switches) and 16 (routers) After these tests have completed, the Cisco device finds and locates the IOS and then proceeds to load it Once the IOS is loaded, the IOS then searches for the device s configuration and executes it With steps 2 and 3, the Cisco device typically goes through fallback measures if it cannot find an IOS or locate a configuration file As you will see in this chapter, and as you work with Cisco devices in a production environment, each Cisco product is unique and may have its own methods for finding and loading its IOS and configuration files As an example, a Catalyst 2960 switch, direct from Cisco, comes with a default configuration already on it This When an IOS device boots configuration is enough to allow the switch up, it runs POST, nds and loads the IOS, to perform basic switching functions right and then nds and loads the device s out of the box A Cisco router, by contrast, con guration le requires some basic configuration to route traffic between interfaces
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How you access the IOS CLI on a Cisco device for the first time depends on the kind of device you are configuring In almost every case, you will use the console interface initially to interact with the device; however, gaining access to the CLI from the console port can be different from one device to another On a Cisco router, for instance, you are taken directly to the IOS CLI when you log in from the console port If the IOS cannot find a configuration file for the router or switch, the IOS takes you through Setup mode (commonly called the System Configuration Dialog), which is a basic configuration script that prompts you for information on how you want to configure your IOS device (discussed in 16) Once you have configured your Cisco device via the console port, you can then use other methods of accessing and changing its configuration, such as telnet or SSH Cisco calls this virtual type terminal (VTY) access Trivial File Transfer
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Protocol (TFTP), Simple Network Management Protocol (SNMP), or a web browser (Security Device Manager, or SDM, for routers) Cisco has a variety of management products that can be used to configure and manage your Cisco device, such as CMS; however, this book focuses primarily on the IOS CLI SDM for routers is discussed in 18
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In this and subsequent chapters, you will see that even though both Cisco routers and switches run the IOS, the commands used by these products are frequently different! In other words, how you configure a feature on a Cisco router might be different from how you configure the same feature on a Catalyst switch However, how you access the IOS and maneuver around the IOS access levels, as well as how you use many of the management commands, are performed the same way on all IOS products This can become confusing to a Cisco novice, as one command for a particular feature is the same on all Cisco products, but configuring another feature might differ between a Cisco router and a Catalyst switch In addition to command differences between different products, such as routers and switches, command differences may exist within a product line, such as Cisco routers, for instance For example, Cisco sells different flavors of its IOS software for routers, depending on the features that you need Or because of hardware differences, some commands work on some routers but not on others
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