CCNA and CCNP candidates need to know all about Setup Mode, why a router goes into that mode, and as you'll see, how to get out of that mode. Practicing Setup Mode at work is a good way to get fired, though, so you need to practice this on your CCNA / CCNP home lab or rack rental. In this article, we'll take a look at a Cisco 2500 router going into setup mode and a few tips that will help you pass the exams and excel at your job.
Laptop Battery First, why does a router go into Setup Mode in the first place? When a Cisco router boots up, the router looks into Non-Volatile RAM (NVRAM) for the startup configuration file. If such a file is not found, and the router has not been programmed to look to a TFTP server for this file, the router enters setup mode.
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Thinkpad The most common reason for a router not to have a startup configuration file is that the file's been erased. We will now erase this file on our 2500 router. As you'll see, the Cisco router warns us about erasing NVRAM and makes us confirm this choice, which it acknowledges with the OK message.
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Microsoft R1#write erase
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Laptop Computers Erasing the nvram filesystem will remove all files! Continue? [confirm]
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Laptop Computer [OK]
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Desktop Computer Erase of nvram: complete
Notebooks R1#
Lenovo The router will now be reloaded. There is a slightly misleading message displayed during reboot:
Hard Drive R1#reload
Travelstar Proceed with reload? [confirm]
Gateway 00:15:21: %SYS-5-RELOAD: Reload requested
Laptop Parts System Bootstrap, Version 11.0(10c)XB1, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Software Copyright (c) 1986-1997 by cisco Systems
Hard Drives
2500 processor with 14336 Kbytes of main memory
Electronics Notice: NVRAM invalid, possibly due to write erase.
Canon That notice doesn't mean the NVRAM is corrupt or unusable; this message means the NVRAM doesn't have a startup configuration file.
Desktop Pc The router will continue to boot and finally present you with this prompt:
Desktop Computers
--- System Configuration Dialog ---
Think Pad Would you like to enter the initial configuration dialog? [yes/no]:
Repair Almost every WAN engineer I know answers "no" to this question, because Setup
Mode is a long, clumsy way to set up a router (in my humble opinion). We will
answer "yes" in order to see this mode in action.
Data Recovery
--- System Configuration Dialog ---
Cisco Would you like to enter the initial configuration dialog? [yes/no]: y
Keyboard At any point you may enter a question mark '?' for help.
Monitor Use ctrl-c to abort configuration dialog at any prompt.
Desktop Default settings are in square brackets '[]'.
Infosys Basic management setup configures only enough connectivity
Refurbished Laptops for management of the system, extended setup will ask you
Wipro to configure each interface on the system
Lap Top Would you like to enter basic management setup? [yes/no]: y
Refurbished Configuring global parameters:
Memory Enter host name [Router]: R1
Intel The enable secret is a password used to protect access to
privileged EXEC and configuration modes. This password, after
entered, becomes encrypted in the configuration.
As400 Enter enable secret:
Averatec % No defaulting allowed
Hardware Enter enable secret:
Dual Xeon
Already, there's something about Setup Mode that you might not like. This mode forces you to set an enable password and an enable secret password. As you continue in this mode, you'll see this mode ask you questions about every single interface on the router, even if you're not planning to use that interface. Using Setup Mode really does get quite old after a while, again in my opinion.
Storage One of the most important things about Setup Mode is knowing how to get out of it without saving the configuration. One way is at the very end of this mode, where you can answer "no" to "Do you want to save this configuration?" I personally never make it that far! Instead of waiting until the end of Setup Mode, we can use the CTRL-C key combination to abort this mode and ignore the changes.
Seagate Configuration aborted, no changes made.
Computer Sales
Press RETURN to get started!
Computer Hardware Setup Mode is not a mode that CCNA and CCNP candidates get a great deal of practice with, but you will be tested on your knowledge about it both in the exam room and on the job. And once you start configuring a router with this mode, you'll be glad you know how to get out of it!
Printers
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