From: Parrish, Ben (parrisb@xxxxxxxxxxxx)
Date: Thu Dec 06 2001 - 11:35:13 GMT-3
Phil, et al:
Emonk says that he never goes into boot mode. Even by your own post the
router goes into boot mode. He does not manually reboot the router into
boot mode by changing the config registers himself, but the router does go
into boot mode. It is all a matter of the flash can not be written to when
the IOS is running from that flash. He is on a local segment so no need to
set a gateway so when the router starts pulling the image all is well.
Router completes pull and reloads.
Ben P.
-----Original Message-----
From: Phil [mailto:ciscostudent1@yahoo.com.br]
Sent: Thursday, December 06, 2001 7:08 AM
To: Parrish, Ben; ccielab@groupstudy.com
Cc: 'emonk@att.net'; 'jasbhati@cisco.com'
Subject: RE: Important: Read -only flash on 2500 routers
Sorry but Emonk is right.
I've always upgraded my 2500 images the way he states. What happens is that
before starting the copy itself the router reboots and puts itself in
bootrom so, obviously, you lose connectivity with the router if you're not
connected to the console but the upgrade happens (unless the image is
corrupted or you have any other unexpected problem). I particularly don't
like this behavior so what I do is to make the router boot from tftp with an
ip only image about 5M in size (this image is small enough to fit the 2500
DRAM - all my 2500 have 16MB). After that I can do whatever I want, erase
flash, copy from tftp, etc and the router won't reboot during the process,
it will behave like any router running IOS from RAM.
Phil.
"Parrish, Ben" <parrisb@netsolve.net> escreveu:
All,
I have to Disagree. As stated previously by another poster the
2500 runs the IOS from flash. Therefor you can not write to the flash
partition in use.
If you have a large enough flash you can partition your flash and then
write to the second partition. After the image is on the second
partition, use a "boot system flash" command to boot from the second
image. By pushing the image down to the router while it is fully
functional there is no need to put the router into boot mode.
Benjamin Parrish
Customer Engineering
NetSolve, Inc.
Austin Network Management Center
-----Original Message-----
From: emonk@att.net [mailto:emonk@att.net]
Sent: Wednesday, December 05, 2001 10:02 AM
To:: Jaspreet Bhatia
Cc: ccielab@groupstudy.com
Subject: Re: Important: Read -only flash on 2500 routers
Jaspreet and everyone.
HOW WOULD YOU REMOTELY UPGRADE YOUR IOS IF YOU HAD TO GO
INTO BOOT ROM MODE? WOULD CISCO WORKS BE ABLE TO UPGRADE
YOUR IOS? Here is the answer.
I just upgraded my 2501 without going into boot rom mode
2101. I kept my reg at 2102. My setup was my PC attached
to a CAT5000 switch and the routers eth0 to the same
vlan on the switch. Both on the same subnet obviously. I
used the Cisco TFTP server.
Then all I did was issue the copy TFTP: Flash: command
and I upgraded my IOS from 11.2 to 12.16. The only thing
that I did was change the name of the file to have an
8.3 extension. Example "1216FW56.bin" Sometimes
Windows95/98/ME does not like Unix style file names.
After upgrading reboot the router and do a write mem.
Just like several other guys said. Changing the boot reg
works but it is harder. Not changing it keeps your
routing functional and you can do a remote flash upgrade.
> >Jaspreet Bhatia wrote:
> >
> >> Folks,
> >> &nb sp; 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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