D-4
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Appendix D Changing the Configuration Register Settings
Changing the Configuration Register Settings
Changing the Configuration Register Settings
You can change the configuration register settings from either the ROM monitor or the Cisco IOS CLI.
This section describes how to modify the configuration register settings from the Cisco IOS CLI.
To change the configuration register using the ROM monitor, see Appendix C, “Using ROM Monitor,”
in this guide.
To change the configuration register settings from the Cisco IOS CLI, complete the following steps:
Step 1 Connect a terminal or PC to the router console port. If you need help, see the hardware installation guide
for your router.
Step 2 Configure your terminal or terminal emulation software for 9600 baud (default), 8 data bits, no parity,
and 2 stop bits.
Step 3 Power on the router.
Step 4 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 5 Enter privileged EXEC mode by typing enable and, if prompted, enter your password:
Router> enable
Password: password
Router#
Step 6 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 7 To change the configuration register settings, enter the config-register value command, where value is
a hexadecimal number preceded by 0x:
Router(config)# config-register 0xvalue
Note The Cisco IOS software does not allow you to change the console speed bits directly with the
config-register command. To change the console speed from the Cisco IOS CLI, see the
“Configuring the Console Line Speed (Cisco IOS CLI)” section on page D-5.
Step 8 Exit global configuration mode:
Router(config)# end
Router#
0 1 1 2400
0 0 1 1200
Table D-4 Console Line Speed Configuration Register Bit Combinations (continued)
Bit 5 Bit 11 Bit 12
Console Line Speed
(baud)
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