Changing Configuration Register Settings - Cisco GSR12/60 - 12012 Router -AnyLAN, SONET/SDH Installation And Configuration Manual

Note
PCMCIA slot 0 or slot 1, the configuration register setting is overridden and the bootable
Cisco IOS software image will be booted instead of the default TFTP-bootable Cisco IOS
software image (cisco2-grp through cisco17-grp on the GRP and cisco2-prp through
cisco17-prp on the PRP).
You must set the boot field for the boot functions you require.

Changing Configuration Register Settings

Use the following procedure to change the configuration register while running the system
software:
Step 1
Step 2
Step 3
Step 4
If a bootable Cisco IOS software image exists in a Flash memory card installed in
Enter the enable command and your password to enter privileged level as
follows:
Router> enable
Password:
Router#
Enter the configure terminal command at the privileged-level system prompt
(#), also called the enabled prompt. You are prompted, as shown in the following
example:
Router# conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#
Set the contents of the configuration register by entering the config-register
value configuration command, where value is a hexadecimal number preceded
by 0x (see Table 4-3), as in the following:
Router(config)# config-register 0xvalue
Exit configuration mode by entering Ctrl-Z. The new value settings are saved to
memory; however, the new settings do not take effect until the system software
is reloaded by rebooting the system.
Observing System Startup and Performing a Basic Configuration 4-27
Implementing Other Configuration Tasks