Solved: boot system and config register commands

sarahr202 · ‎02-28-2009

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!

Edison Ortiz · ‎02-28-2009

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.

View solution in original post

JamesLuther · ‎02-28-2009

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 · ‎02-28-2009

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!

Edison Ortiz · ‎02-28-2009

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.

sarahr202 · ‎02-28-2009

Thanks Edison!