Boot Field Settings - Cisco 12404 Installation And Configuration Manual

Performing Other Configuration Tasks

Boot Field Settings

Note
Cisco 12404 Internet Router Installation and Configuration Guide
4-4
Table 4-2 Boot Field and Definitions (continued)
Boot Field Definition
02 to 0F At power-on, the system boots automatically from a default
Cisco IOS software image stored on a TFTP server in the network.
For this setting, it is assumed that the Ethernet port on the RP is
configured and operational. This setting also enables boot system
commands that override the default filename.
Note: A Cisco 12404 Internet router is typically delivered from the
Note
factory with a boot image in the boot flash and a flash card containing a
suitable working Cisco IOS image. If you discover that you need an
Cisco IOS upgrade, you should FTP the appropriate Cisco IOS image
from CCO.
The four low-order bits of the software configuration register (bits 3, 2, 1, and 0)
form a boot field that defines the source of a Cisco IOS software image for booting
the router.
You can set or change the contents of the boot field by issuing the config-register
command at the global configuration mode prompt [
The factory default configuration register setting for an RP shipped in a router or
an RP shipped as a field-replaceable unit is 0x0102.
When the boot field is set to either 0 or 1 (0000 or 0001), the system ignores any
boot instructions in the system configuration file and one of the following occurs,
depending on the boot field setting:
When the boot field is set to 0, you must boot the operating system manually
•
by entering the boot command at the ROM monitor prompt (
can enter the boot command with or without arguments.
If you enter the boot command without an argument (that is, without
specifying a file or any other boot instructions), the system automatically
boots using the default image in the Flash memory SIMM on the RP.
Chapter 4 Troubleshooting the Installation
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