[cisco-voip] v15 boot system command

[Peter Slow]

this is all handled by the ROM on your router, and on some routers,
the ROM followed by a boot helper image.  What version of IOS your
router is able to boot is a function of the ROM version, boothelper if
there is one, (there isn't on the routers you are all familiar with)
and DRAM. (you can load from tftp if you're out of flash memory ;)

with no boot system command in there, the router will try to boot the
first file on flash that appears to be a valid image for the platform.
afaik, an 1800 will not try to boot a 2800 image, etc.

now that you have upgraded to 15.x, you are still able to put a 12.x
image on and reload, bringing you back to 12.x. your main concerns
will be compatibility between startup-config files, as not all of the
commands from 15.x will be recognized in 12.x.

-Pete

On Wed, Mar 23, 2011 at 10:28 AM, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:
> So I upgraded a VG224 from v12 to v15. Not too much of an issue, but I
> noticed that after the upgrade was done, there was no "boot system slot0:"
> command.
>
> From what I recall, with no "boot system" command, it boots with the
> first(?) IOS image listed. I'm guessing v15 won't look at a v12 IOS image,
> but what happens when I load another v15 image onto the box?
>
> What have others seen?
>
> Lelio
>
>
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Cooking with unix is easy. You just sed it and forget it.
>                               - LFJ (with apologies to Mr. Popeil)
>
>
>
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