From: Christopher A. Jarosz (cajarosz@xxxxxxxxxxxx)
Date: Wed Dec 05 2001 - 01:37:38 GMT-3
Hi Jaspreet !!
Since the 25XX series runs the stored IOS from flash, it always marks the flash
as read only. The way to load a new image is....
1) Prepare to run from the boot roms
config t
conf-reg 0x2101
cntl <Z>
write mem
reload
2) After the router reboots, you will see that the router's flash is now
read/write. Copy the new image to the router via the "copy tftp flash"
command. ** Please note ** the 25XX doesn't have routing enabled while
running the IOS on the bootroms, so you'll need to have the TFTP server on the
lan segment that directly connects to the router that you're upgrading.
3) After the image has been copied and the checksum is good, do the following:
config t
conf-reg 0x2102
ctl <z>
reload
** DO NOT WRITE THE RUNNING CONFIG TO MEMORY. While you are running from the
bootflash roms, it may (read WILL) not understand any configuration commands
from the higher version of IOS in NVRAM, so any commands (say from 12.0) would
be lost on the reboot.
After the router reloads, you should be running from the new ios image. After
it successfully loads, you can then do a "write mem". The router will ask you
to confirm the write of config data from a previous ios level. Say "yes", and
you'll be off and rocking on the new release.....
HTH....
chrisj
Jaspreet Bhatia wrote:
> Folks,
> I have about 5 2511 routers taht I am trying to upgrade
> to 12.1 .The problem is that the flash is read-only so will not allow me to
> do anything on the flash .Is there a way to convert that flash into a R/W
> flash ?
>
> Thanks for your help
>
> Jaspreet
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