[nsp] 7200 Boot selection process

[Kevin Kincaid]

http://www.cisco.com/en/US/customer/products/sw/iosswrel/ps1828/products_con
figuration_guide_chapter09186a00800ca552.html#3838

or

What Image Does the Router Use upon Startup?
When a router is powered on or rebooted, the following events happen:

The ROM Monitor initializes. 

The ROM monitor checks the configuration register boot field (the lowest
four bits in the register). 
If the boot field is 0x0, the system does not boot an IOS image and waits
for user intervention at the ROM Monitor prompt. 
If the boot field is 0x1, the ROM monitor boots the boot helper image. (On
some platforms, the boot helper image is specified by the BOOTLDR
environment variable.) 
If the boot field is 0x2 through 0xF, the ROM monitor boots the first valid
image specified in the configuration file or specified by the BOOT
environment variable. 
When the boot field is 0x2 through 0xF, the router goes through each boot
system command in order until it boots a valid image. If bit 13 in the
configuration register is set, each command will be tried once. If bit 13 is
not set, the boot system commands specifying a network server will be tried
up to five more times. The timeouts between each consecutive attempt are 2,
4, 16, 256, and 300 seconds.

If the router cannot find a valid image, the following events happen:

If all boot commands in the system configuration file specify booting from a
network server and all commands fail, the system attempts to boot the first
valid file in Flash memory. 
If the "boot-default-ROM-software" option in the configuration register is
set, the router will start the boot image (the image contained in boot ROM
or specified by the BOORLDR environment variable). 
If the "boot-default-ROM-software" option in the configuration register is
not set, the system waits for user intervention at the ROM Monitor prompt.
You must boot the router manually. 
If a fully functional system image is not found, the router will not
function and must be reconfigured through a direct console port connection. 

-----Original Message-----
From: Gerald [mailto:gcoon at inch.com]
Sent: Thursday, August 21, 2003 5:51 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] 7200 Boot selection process


I seem to have difficulty finding a Cisco documented answer for this
so...:

What is the selection pattern for a Cisco 7200 for picking IOS images.

I had the boot order show up properly in sho run. Copied to startup,
reloaded and it picked the image on slot0:image instead of the higher
listed image on slot1:image.

Does it pick the lower number by default? Where does it decide 
what it is
going to pick from if both options are on flash.

Thanks for the help,

Gerald
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