When you're preparing for success on your CCNA or CCNP certification exams, sooner or later you're going to want to start totally from scratch on your Cisco routers and switches. It's 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.
Laptop Battery The first step is indeed to run the command write erase, and then reload the router. You're 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!
Occasionally, during your CCNA and CCNP studies, you'll run into a term that just doesn't quite make sense to you. (Okay, more than occasionally!) One such term is "reverse telnet". As a Cisco certification candidate, you know that telnet is simply a protocol that allows you to remotely connect to a networking device such as a router or switch. But what is "reverse telnet", CCNP home lab setup
Thinkpad First, you will be prompted to confirm the erase. Press to accept the default answer of "confirm".
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Microsoft R1#write erase
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Laptop Computers Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
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Laptop Computer [OK]
Your access server will use an octal cable to connect to the other routers and switches in your home lab. The octal cable has one large serial connector that will connect to the access server, 45 connectors that will connect to your other home lab devices. Your access server then needs an IP Host table in order to perform reverse telnet.
Desktop Computer Erase of nvram: complete
Notebooks With the startup configuration erased, it's time to reload the router. This is where the second prompt comes in:
Lenovo R1#reload
Hard Drive System configuration has been modified. Save? [yes/no]: no
Travelstar When a Cisco router prompts you with two answers to a question, you've 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.
Gateway 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.
Laptop Parts --- System Configuration Dialog ---
Software Would you like to enter the initial configuration dialog? [yes/no]: n
Hard Drives Would you like to terminate autoinstall? [yes]:y
Electronics You'll see quite a few messages after this relating to interface states, and finally you're back at the user exec prompt.
Canon Router>
Desktop Pc Now you're working with a router that's just like it was when it came out of the box!
Desktop Computers 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.
Think Pad switch1#write erase
Repair Erasing the nvram filesystem will remove all files! Continue? [confirm]
Data Recovery [OK]
Cisco Erase of nvram: complete
Keyboard switch1#delete vlan.dat
Monitor Delete filename [vlan.dat]?
Desktop Delete flash:vlan.dat? [confirm]
Infosys switch1#reload
Refurbished Laptops Make sure to hit for the two questions regarding the deletion - if you answer "y" instead, the switch thinks you're trying to erase a file named "y"!
Wipro After the reload is complete, you'll be prompted to enter setup mode. As you did with the router, enter "N" and begin to configure the router from user exec mode. There's nothing like working with real equipment to prepare for your CCNA and CCNP success, and there's no better practice than configuring routers and switches from the very beginning!
Lap Top
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