I also found it very confusing at first, but I figured this out after much
deliberation with trial and errors.
For the more upscale and "bigger" routers such as the 7200/7500 series, you
need to have a boot image and an IOS image. The boot images are usually
between 3-5MB, around there.
You can tell if it's a boot image because it will list it in CCO under the
description. When you choose an IOS image, you see a lot of different kinds
because each IOS image has certain built-in "goodies". Some have some
firewalling capabilities and some support stronger encryption and etc. The
IOS images can become pretty beefy taking up around 8-12MB. For some of
those images, I would also recommend you check to see that you have enough
dram to run the image as well.
----- Original Message -----
From: "Daniel Cotts" <[EMAIL PROTECTED]>
To: "'Mixa'" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Monday, April 02, 2001 1:03 PM
Subject: RE: Help for BOOTFLASH
> Think of the router having three levels of intelligence. Most basic is the
> Bootstrap image stored in ROM. Next comes the boot image. Then the IOS
image
> that the router runs in production. Each has its own prompt: rommon> ,
> router(boot)>, router#. A boot image placed in bootflash: on a 7500 will
> automatically load unless the configuration contains a boot bootldr
command
> pointing to another location. It is good, although not necessary, to have
> the boot and running IOS image be from the same release. (Comments
requested
> from others on this point). The full IOS image that you run will have
> various features. You determine what you need - then purchase it from
Cisco.
> If you have a service contract you may update (newer rev number) but not
> upgrade (add features) your IOS image. This running image is stored on a
> PCMCIA card (slot0: or slot1:) on the RSP card. Default behaviour is to
load
> the first image in slot0:
> Use "cd" to set the default location. Use "pwd" to see the current default
> location. Use boot system flash slot0: or 1:file name for other than
default
> location. If you have enough space on your PCMCIA card(s) you may store
> multiple images. It then becomes easy to change. This is very useful when
> updating - just in case the newer image doesn't behave as expected.
>
> A long way to say that on a 7500 you need both a boot image and a running
> image (the beefy one).
>
> > -----Original Message-----
> > From: Mixa [mailto:[EMAIL PROTECTED]]
> > Sent: Monday, April 02, 2001 11:27 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Help for BOOTFLASH
> >
> >
> > Daniel,
> >
> > I have a similar question. On the CCO, there is a file called
> > bootflash
> > image and it's about 5MB to dowload. Also, there are numerous
> > images to
> > download as well as as IP, IP/FW/IPSEC etc,. Which one is the
> > image that a
> > Cisco 7507 needs to upgrade. My brother asked me a question
> > and I have no
> > idea. He wants to flash the latest IOS 12.1.1 but very
> > confuse. Where is
> > that bootflash image go on the router? What about slot 0,
> > slot 1. What about
> > all the beefy features IOS?
> >
> > Thanks
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