Cisco CCNA 640-802 CCENT Certification Exam Training: The Configuration Register Computers Articles | November 15 Authentic Kevin Kiermaier Jersey , 2007
To pass the CCNA and CCENT Cisco certification exams, you've got to understand how and when to manipulate the configuration register.? Learn all about the commands - and dangers - of doing so from Chris Bryant, CCIE #12933.
Bottom line: To earn your Cisco CCNA and CCENT certifications, you've got to understand the configuration register on Cisco routers and switches. This is also a great practical skill to have Authentic Avisail Garcia Jersey , because one day you will have to change the config register, most likely to perform a password recovery.?
I will just give this warning one time: If you change the register to an incorrect value and then reload the router, you can cripple the router and even Cisco can't bring it back.
No pressure, right?? :)
You really just have to be careful and get the right value for what you're trying to do before you change the config register.? Another key is to change the register back to the original value once you're done with your work.
To see the current config register value Authentic Wade Boggs Jersey , run the always-helpful command show version.? The config register value is at the very bottom of that output, but while we're here, let's take a look at all of this information.
16384K bytes of processor board System flash (Read ONLY)
Configuration register is 0x2102
The first bolded field tells you what IOS software and version this router is running.
The second bolded field shows you how long the router's been up Willy Adames Jersey , why the router went down ("reload"), and the IOS file contained in flash.
Below that, but not bolded, is a list of interfaces on the router and the capacity of NVRAM and Flash.
The third bolded field shows you the amount of NVRAM your router has.? Since the startup config file is kept there Charlie Morton Jersey , that's as large as the startup config file can get!
Finally, the all-important config register value.? You'll learn about manipulating the config register during your CCNA studies, but you should know that the value shown, 0x2102 Kevin Kiermaier Jersey , is the factory default.? This value forces the router to look in its own Flash memory for a valid IOS on startup.
The config-register value does require a reload for a changed value to take effect.? I'll change this value to 0x2142 and run show version again, cropping out all information except the config-register.? The register setting 0x2142 forces the router to bypass the startup configuration file kept in NVRAM.
Router1(config)#config-register 0x2142
Router1#show version
Configuration register is 0x2102 (will be 0x2142 at next reload)
Like debugs, the config-register command should be used with caution.
Another common value used with config-register is 0x2100, which boots the router into ROM Monitor mode.
To review these common configuration register settings:
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