The General Ideas Behind Cisco Password Recovery/Reset
Although the details differ from model to model, all the password recovery procedures follow the same general principles. First, the end goal of the process is to make the router boot IOS while ignoring the startup-config file. Of course, this startup configuration holds all the passwords. Once the router boots while ignoring the initial configuration, you can log in at the console with no password restrictions and reconfigure all the passwords.
Cisco defines a specific configuration register bit that when set to binary 1 tells the router to ignore the startup-config file next time the router is loaded. To set that value, the default configuration register value of 0x2102 can be changed to ...
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