Chapter 11 Accessing and Using GRUB Mode
Changing the Configuration Register Settings
Changing the Configuration Register Settings
You can change the configuration register settings from either the GRUB or the Cisco IOS XE CLI. This section describes how to modify the configuration register settings from the Cisco IOS XE CLI.
To change the configuration register settings from the Cisco IOS XE CLI, complete the following steps:
Step 1 Power on the router.
Step 2 If you are asked whether you would like to enter the initial dialog, answer no:
Would you like to enter the initial dialog? [yes]: no
After a few seconds, the user EXEC prompt (Router>) appears.
Step 3 Enter privileged EXEC mode by typing enable and, if prompted, enter your password:
Router> enable
Password: password
Router#
Step 4 Enter global configuration mode:
Router# configure terminal
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z
Step 5 To change the configuration register settings, enter the
Router(config)#
Step 6 Exit global configuration mode:
Router(config)# end
Router#
Step 7 Save the configuration changes to NVRAM:
Router# copy running-config startup-config
The new configuration register settings are saved to NVRAM, but they do not take effect until the next router reload or power cycle.
Displaying the Configuration Register Settings
To display the configuration register settings that are currently in effect and the settings that will be used at the next router reload, enter the show version command in privileged EXEC mode.
The configuration register settings are displayed in the last line of the show version command output:
Configuration register is 0x142 (will be 0x142 at next reload)
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