Chapter 4 Troubleshooting the Installation
Performing Other Configuration Tasks
4-6
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
Note
If a bootable Cisco IOS software image exists in a Flash memory card inserted in
PCMCIA slot 0 or slot 1, the software configuration register boot field setting is
overridden. The system then boots from the Cisco IOS software image in the Flash
memory card, rather than from a network TFTP image (that is, from a computed
filename in the range from
cisco2-grp
through
cisco17-grp
or
cisco2-prp
through
cisco17-prp
).
Configuration Register Settings
To change the software configuration register settings while running system
software, follow these steps:
Step 1
Enter the
enable
command and your password at the user EXEC mode prompt to
enter privileged EXEC mode:
Router>
enable
Password: <
password
>
Router#
Step 2
Enter the
configure terminal
command at the privileged EXEC mode prompt on
the system console to enter global configuration mode, as shown in the following
example:
Router#
configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#
Step 3
Set the contents of the software configuration register by entering the
config-register
value
command at the global configuration mode prompt, where
value
is a hexadecimal number preceded by 0x, as in the following:
Router(config)#
config-register 0x
value
Consult the hexadecimal column in
Table 4-1 on page 4-2
for the possible settings
to enter as the four-bit
value
parameter.
Step 4
Exit global configuration mode by entering
Ctrl-Z
.
Router(config)#
config-register 0x
value
Router(config)#
Ctrl-Z
Router#
