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This Question is Not Answered 1 Correct Answer available (4 pts) 2 Helpful Answers available (2 pts)
6465 Views 2 Replies Latest reply: Mar 25, 2013 9:41 AM by Carlos RSS

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what is 'boot-start-marker'

Mar 23, 2013 9:11 AM

Andres 60 posts since
Jan 6, 2011

What do these 2 commands in a router config file mean:

 

boot-start-marker

boot-end-marker

 

Is it safe to remove them by issuing the 'no' version of each?

 

Thanks,

 

-Andres

  • jneiberger 465 posts since
    Jun 10, 2010
    Currently Being Moderated
    1. Mar 23, 2013 9:18 AM (in response to Andres)
    Re: what is 'boot-start-marker'

    They mark the beginning and end of the boot section of the configuration. If you add any boot commands, this is where they go. For example, if you want to boot to a different IOS on the flash, you would need to add a command to do that and this is where you'd see it. I'm not even sure you can remove them, but there is no point in doing so.

  • Carlos 24 posts since
    Dec 17, 2012
    Currently Being Moderated
    2. Mar 25, 2013 9:41 AM (in response to Andres)
    Re: what is 'boot-start-marker'

    You can't remove those commands.  If there is nothing between the two commands then you know you are booting your IOS from flash.  In my opinion, its useful to use the boot commands when you are upgrading your IOS and want to keep the old IOS on the flash.  You could specify in a boot statement to boot to the new IOS instead of the old one.  You could also have multiple boot statements for instance if one IOS isnt on the flash or something go to the next IOS (the first command takes precedence).  Keep in mind though, if you use the boot statements be sure it is exact as to the location of the IOS.  Here is an example

     

    boot-start-marker

    boot system disk0:s72033-adventerprisek9_wan-mz.122-33.SXI10.bin

    boot system disk0:s72033-adventerprisek9_wan-mz.122-33.SXI2a.bin

    boot-end-marker

    

    

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