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A simple search in a search engine such as Google for Cisco password recovery will show you documents

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such as the following, which give you step by step instructions for recovering passwords from various

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devices.

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Here's an example for the Cisco 2900 Integrated Services Router.

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Documents such as the following will show you a step-by-step procedure for recovering the passwords.

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So, for example, either switch off or shut down the router, remove the compact flash that is on the

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back of the router.

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Here's an example of a 2951, 

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you can get more information about the back panel slots and connectors on the various routers once again

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from Cisco's website.

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So as an example, you are shown here on 2901 where the compact flash is 01 and that'll

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continue for various routers of different descriptions.

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So as an example for 2911 the compact flash is found here and here, so you need to remove the compact

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flash as an example and then switch on the router.

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Once the router is in ROM MON mode, reinsert the compact flash and then type CONF REG 0x2142 at

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the ROM MON prompt.

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Now, as part of this course, you'll have access to the configure register software.

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This allows you to see various options for the configuration register.

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So as an example, if you set it to 2142, as shown on the Cisco website.

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That shows you that it ignores NVRAM contents.

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So bit-6 is set on, in other words, the third hexadecimal value, and if you remember, a hex

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values is 4 binary bits, this bit, bit-6 is set on, which means ignore and NVRAM contents.

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So the router will boot up, but it will ignore any saved configuration.

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You type reset to reboot the router.

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So the router will now reboot but ignore the saved configuration.

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You need to type no or control see to skip the initial set up procedure, then type enable at the 

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router a prompt and then type configure memory or copy start up config to running-config

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and then you could change the password by typing configure terminal, enable secret and whatever password

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you want to configure.

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You will need to no-shut any interfaces that you want to use when the router boots, all interfaces

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will be in the down state when you copy your config from start up to running-config.

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So you need to manually no-shut them.

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You should then use the config register command to set it back to the default register.

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So config register is 0x2102  as an example, and then you need to save your config.

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This document is great.

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It shows you

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the full examples of what you're going to be doing, but rather than doing it that way, I'm going to

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simply demonstrate this.