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12.2 Initial Router Startup
Initial Router Startup Section 12: Configuring a Cisco Router Cisco provides several different types of router hardware, including some routers that just do routing, while other routers offer additional functions. In fact, Cisco has a series of routers calledISR, with the name emphasizing the fact that many functions are integrated into a single device. The following figure shows the Cisco 2901 ISR with some of the more important features highlighted. The startup of a Cisco router requires verifying the physical installation, powering up the router, and viewing the Cisco IOS Software output on the console. To start router operations, the router completes the following tasks: Runs the POST to test the hardware Finds and loads the Cisco IOS Software that the router uses for its operating system Finds and applies the configuration statements about routerspecific attributes, protocol functions, and interface addresses When a Cisco router powers on, it performs a POST. During the POST, the router executes diagnostics to verify the basic operation of the CPU, memory, and interface circuitry. After verifying the hardware functions, the router proceeds with software initialization. During software initialization, the router finds and loads the Cisco IOS image. When the Cisco IOS image is loaded, the router finds and loads the configuration file, if one exists. Before you start the router, verify the power and cooling requirements, cabling, and console connection. Then push the power switch to On and observe both the boot sequence and the Cisco IOS Software output on the console. Up Next: Initial Router Setup