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Cisco CCNA / CCNP Home Lab Tutorial: Starting Over

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When youre preparing for success on your CCNA or CCNP certification exams, sooner or later youre going to want to start totally from scratch on your Cisco routers and switches.

Its easy enough to type “write erase” and “reload”, but there are a few details you have to watch if you want your home lab or rack rental devices to act as though they just came out of the box.

The first step is indeed to run the command write erase, and then reload the router. Youre going to be prompted with a question before the reload starts, though, and you have to give the right answer …. or your configuration will still be there when you reload!

First, you will be prompted to confirm the erase. Press to accept the default answer of “confirm”.

R1#write erase

Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]

[OK]

Erase of nvram: complete

With the startup configuration erased, its time to reload the router. This is where the second prompt comes in:

R1#reload

System configuration has been modified. Save? [yes/no]: no

When a Cisco router prompts you with two answers to a question, youve got to type the answer in (or at least the first letter of it). Answer NO to this question and press when prompted to confirm the reload.

The router will then start the reload process. Since there is no startup configuration in NVRAM, the router will prompt you to enter setup mode. You should only answer yes if you have a lot of time on your hands, just want to see what setup mode is like, or practice CTRL-C to get out it! Otherwise, answer NO.

— System Configuration Dialog —

Would you like to enter the initial configuration dialog? [yes/no]: n

Would you like to terminate autoinstall? [yes]:y

Youll see quite a few messages after this relating to interface states, and finally youre back at the user exec prompt.

Router>

Now youre working with a router thats just like it was when it came out of the box!

For switches such as the 2950, the process is much the same, but you should delete the VLAN.DAT file before reloading the router. This file contains VLAN information and is kept in flash, so it will still be present after a reload.

switch1#write erase

Erasing the nvram filesystem will remove all files! Continue? [confirm]

[OK]

Erase of nvram: complete

switch1#delete vlan.dat

Delete filename [vlan.dat]?

Delete flash:vlan.dat? [confirm]

switch1#reload

Make sure to hit for the two questions regarding the deletion – if you answer “y” instead, the switch thinks youre trying to erase a file named “y”!

After the reload is complete, youll be prompted to enter setup mode. As you did with the router, enter “N” and begin to configure the router from user exec mode. Theres nothing like working with real equipment to prepare for your CCNA and CCNP success, and theres no better practice than configuring routers and switches from the very beginning!

Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of FREE CCNA and CCNP tutorials and daily exam questions, as well as The Ultimate CCNA and CCNP Study Packages.

For a FREE copy of his latest e-books, “How To Pass The CCNA” or “How To Pass The CCNP”, and for free daily exam question, visit the website and download your copies!

Cisco CCNA / CCNP Home Lab Tutorial: Starting Over
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About Chris Bryant
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of FREE CCNA and CCNP tutorials and daily exam questions, as well as The Ultimate CCNA and CCNP Study Packages.

For a FREE copy of his latest e-books, "How To Pass The CCNA" or "How To Pass The CCNP", and for free daily exam question, visit the website and download your copies! WebProNews Writer
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