The Cisco IOS Software Boot Sequence
Lesson 1: Understanding a Router’s Boot Sequence
Cisco routers perform the same types of tasks that a typical computer performs when you power it on or reboot (reload) it. However, most end-user computers have a single instance of the OS installed, so the computer does not have to choose which OS to load. In contrast, a router can have multiple IOS images available both in flash memory and on external TFTP servers, so the router needs a process by which to pick which IOS image to load into RAM and use. This section examines the entire boot process, with extra emphasis on the options that impact a router’s choice ...
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