boot system and config register commands

Answered Question
Feb 28th, 2009
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HI every body!


If we use " config register" and " boot system" command, which one takes precedence over the other? for example config register specify the different location for ios to load and boot system specify different location for ios to load.



Thanks a lot!




Correct Answer by Edison Ortiz about 8 years 3 weeks ago

If we use " config register" and " boot system" command, which one takes precedence over the other?


config-register is executed before boot system command.


HTH,


__


Edison.

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JamesLuther Sat, 02/28/2009 - 15:47
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Hello,


Boot system tells the router which IOS image to load.


config-register tells the router how to boot. ie you can set the router to go straight to eprom, boot using the startup-config or boot ignoring the startup-config etc etc.


Try reading these links


http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008022493f.shtml


http://www.cisco.com/en/US/docs/ios/12_2/configfun/command/reference/frf010.html


or you can find out about any cisco commands by googling someting like


"config-register command reference site:cisco.com"



Thanks

sarahr202 Sat, 02/28/2009 - 17:16
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Thanks a lot James!

By specifying the location, type of ios is also specified automatically. How?

ROM has limited function of ios type

flash has fully functional ios

So when i use the command" boot system rom"

it will tell router the location for ios. Since ROM holds only limited functional ios, therefore type of ios is also specified implicitly .


Thanks a lot!

Correct Answer
Edison Ortiz Sat, 02/28/2009 - 16:36
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If we use " config register" and " boot system" command, which one takes precedence over the other?


config-register is executed before boot system command.


HTH,


__


Edison.

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