Gareth,
I use it to enable my 2500s to run the image from RAM as opposed to flash.
The largest image I was able to get working with 16 megs of RAM in the
router was about a 13 meg IOS image before compression. Anything larger than
about 13 megs won't boot. I haven't tried it but theoretically you could run
this image without any flash at all if you booted the image from a TFTP
server. One of the drawbacks is that the router isn't left with a lot of
memory to use for it's processes (see 'sho mem' below) so I wouldn't
recommend using this in a production environment but in a lab environment it
isn't usually an issue.
Brian Dennis
CCIE #2210 (R&S)(ISP/Dial)
CCSI #98640
[root@FW1 bdennis]# ls -l c2500*
-rw-rw-r-- 1 bdennis bdennis 5861550 Apr 2 18:10
c2500-jos56i-l.120-4.T.Z
-rw-rw-r-- 1 bdennis bdennis 12699926 Apr 2 14:06
c2500-jos56i-l.120-4.T.bin
[root@FW1 bdennis]#
R2#sho ver
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-JOS56I-L), Version 12.0(4)T, RELEASE SOFTWARE
(fc1)
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Wed 28-Apr-99 21:02 by kpma
Image text-base: 0x0000144C, data-base: 0x00B63958
ROM: System Bootstrap, Version 11.0(10c)XB1, PLATFORM SPECIFIC RELEASE
SOFTWARE (fc1)
BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c)XB1,
PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
R2 uptime is 21 hours, 46 minutes
System restarted by reload
System image file is "flash:c2500-jos56i-l.120-4.T.Z"
cisco 2500 (68030) processor (revision L) with 14336K/2048K bytes of memory.
Processor board ID 01486505, with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software copyright 1990 by Meridian Technology Corp).
TN3270 Emulation software.
1 Ethernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102
R2#sho flash
System flash directory:
File Length Name/status
1 5861676 c2500-jos56i-l.120-4.T.Z
[5861740 bytes used, 2526868 available, 8388608 total]
8192K bytes of processor board System flash (Read/Write)
R2#sho mem
Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)
Processor CE69FC 1148420 1148420 0 0 0
I/O E00000 2097152 1345176 751976 682724 722216
R2#
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Gareth Hinton
Sent: Tuesday, April 10, 2001 4:34 AM
To: [EMAIL PROTECTED]
Subject: Re: Mzmaker [7:46]
Can someone explain how this works then?
Where does the image decompress to? The way I understood it, a compressed
image which is stored in flash, decompresses to RAM, then runs from there.
Could 2500's ever Run from RAM? Is this image dependant, I thought a router
was either 'run from flash' or 'run from ram'. Can the IOS change that?
I've used mz images plenty on other routers, but can't find a 2500 image
that is not .bin.
Any replies welcome - I'm off to look into it myself.
Cheers,
Gareth
""Circusnuts"" wrote in message
0f6c01c0c105$035e8fe0$[EMAIL PROTECTED]">news:0f6c01c0c105$035e8fe0$[EMAIL PROTECTED]...
> Gareth- your half right. MZMaker is for the RUN from RAM routers, which
is a
> good portion of the images Cisco supports. I have used MZMaker
exclusively in
> the 2500's for the past 2 years (HOMELAB ONLY). It will not work on the
new
> 12.1 (2500 Series), run from FLASH images- as you suggest. I'm not sure
if
> you have upgraded a lot of routers, via the CCO... but a majority of the
> images have the MZ designation in the IOS name. Cisco uses the very same
> program to compress their images...
>
> Phil
>
> "Gareth Hinton" wrote in message
> 9asrpa$is4$[EMAIL PROTECTED]">news:9asrpa$is4$[EMAIL PROTECTED]...
> > Not convinced!
> > I must admit I've never used Mzmaker, but surely it's only useful for
'Run
> > from RAM' routers.
> > Can it be used at all on a 2500?
> >
> > Gareth
> >
> > ""Bob Timmons"" wrote in message
> > 9asg22$32a$[EMAIL PROTECTED]">news:9asg22$32a$[EMAIL PROTECTED]...
> > > How much RAM do you have on this router? If the uncompressed IOS is
> > greater
> > > than 8MB, you need 16MB of RAM. Remember, when you compress an IOS
image
> > it
> > > will uncompress into RAM when booting. If you have 16MB of RAM, maybe
> try
> > > re-compressing the original IOS image.
> > >
> > > > I have a 2514 w/ 8Mb flash. When I used mzmaker to compress IOS 12
> that
> > > is
> > > > 10MB it worked fine. However, after writing the .mz file to flash
and
> > > > starting up the router it keeps looping "Error : memory requirements
> > > exceed
> > > > available memory
> > > > Memory required : 0x00AF99A0
> > > >
> > > > Exception: Software forced crash at 0x111E (PC)"
> > > >
> > > > and giving this error. Does this not work since on a 2500 series
> router
> > > > the IOS runs in the flash and not ram? Thanks.
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