AIS AI2524 user manual Perform the Boot Field Modification Tasks, Config-register value

Chapter 7: Manually Loading System Images

Perform the Boot Field Modification Tasks

You modify the boot field from the hardware configuration register or the software configuration register, depending on the platform.

The hardware configuration register can be changed only on the pro- cessor card or with dual in-line package (DIP) switches located at the back of the router. For information on modifying the hardware config- uration register, refer to the appropriate hardware installation guide.

To modify the software configuration register boot field, complet these tasks:

1.Obtain the current configuration register setting. show version

2.Enter configuration mode, selecting the terminal option. configure terminal

3.Modify the existing configuration register setting to reflect the way in which you want to load a system image.

config-register value

4.To exit configuration mode, press <Ctrl-Z>.

5.Reboot the router to make your changes take effect. reload

Use the show version EXEC command to display the current con- figuration register setting. In ROM monitor mode, use the o command to list the value of the configuration register boot field.

In this example, the show version command indicates the current configuration register is set so the router does not automatically load an operating system image. Instead, it enters ROM monitor mode and waits for user-entered ROM monitor commands. The new setting in structs the router to a load a system image from commands in the star- tup configuration file or from a default system image stored on a network server.

August 1997	Page 7-17
2524UM