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Performing Other Configuration Tasks
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
4-38
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
and the system 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).
Changing the Software Configuration Register Settings
To change the software configuration register settings while running system software,
perform the following steps:
Step 1 Enter the enable command and your password at the user EXEC mode prompt
to establish the privileged EXEC mode:
Router> enable
Password:
Router#
Step 2 Enter the configure terminal command at the privileged EXEC mode prompt to
establish the global configuration mode:
Router# conf t
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.
Consult the hexadecimal column in Table 4-3 for the possible settings to enter
as the 4-bit value parameter.
The config-register value command takes the following form:
Router(config)# config-register 0xvalue
Step 4 Exit the global configuration mode by entering Ctrl-Z:
Router(config)# config-register 0xvalue
Router(config)#
Ctrl-Z
Router#