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config register

HI

we know config register is the boot sequence. so where store config register .?

Thanks

biplob

8 REPLIES
Purple

Re: config register

Hi,

The config-register is stored in the non-volatile RAM (NVRAM), the same place where the startup-configuration is stored.

Pls do remember to rate posts.

Paresh

New Member

Re: config register

Hi

when router first time boot then where come from config register and if i delete startup config then what happen .

thanks

biplob

Purple

Re: config register

The config register is a 16-bit register in NVRAM, different to the startup-config which is a file of commands. Deleting the startup-config does not affect the config-register.

Pls do remember to rate posts.

Paresh

Re: config register

Hi Biplob,

Config-register is stored in NVRAM it is not stored in startup config so even if you delete the startup config router will boot wth the default initial config.

When the router boots up it reads the config register value from nvram and decide it further task depening upon the config -register vaue.

Now depending upon the config reg value router will decide whether it needs to boot up with the startup config or just will boot bypassing the startup config.

http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/products_tech_note09186a00802017a1.shtml

Now config register can play different role and above is just one example I posted.

HTH, if yes please rate the post.

Ankur

New Member

Re: config register

hi

always stroed here even when first boot router or changr register ?

Thanks

Purple

Re: config register

Hi,

The register is always present, even the first time you boot up the router. The register will have factory-default settings, of course.

Pls do rate posts that help.

Paresh

Re: config register

Hello,

in addition to Paresh´s post(s), keep in mind that the factory-default setting for the configuration register is 0x2102. This means that the router attempts to load an IOS software image from Flash memory and load the startup configuration with a console speed of 9600 baud. If there is no startup configuratio present, you will be presented with the initial configuration dialog...

Regards,

GNT

New Member

Re: config register

The router has a 16-bit configuration register in NVRAM. Each bit has value 1 (on or set) or value 0 (off or clear), and each bit setting affects the router behavior upon the next reload power cycle.

Try the following link:

http://www.cisco.com/en/US/products/ps5854/prod_configuration_guide09186a00802c35d2.html

Rate this post

Thanks,

Yogesh

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