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Route Switch Processor (RSP8) Installation and Configuration Guide
OL-4920-02
Reference Information
Changing Settings
To change the configuration register while running the system software, follow these steps:
Step1 To enter privileged EXEC configuration mode, use theenable command and your password as shown:
Router> enable
Password:
Router#
Step2 Toenter global configuration mode, use the configureterminal command. You are prompted for further
commands, as shown in the following example:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#
Step3 Toset the contents of the configurationregister, use the config-register 0xvalue configuration command,
wherevalue is a hexadecimal number preceded by 0x (see Table 10), as shown in the following example:
Router(config)# config-register 0x
value
Step4 Exit global configuration mode usingCtrl-Z or by typing end.The new configuration register settings
are savedto memory; however, the new settings do not take effect until the system software is reloaded
when you reboot the router.
Step5 Todisplay the configuration register value currently in effect and the value that will be used at the next
reload,enter the show version privileged EXEC command. The value is displayed on the last line of the
screen display, as in the following example:
Configuration register is 0x141 (will be 0x101 at next reload)
Step6 Reboot the router.The new value takes effect. Configuration register changes take effect only when the
system reloads, such as when you issue a reload command from the console.
This completes the procedure to change the configuration register while running the system software.
Bit Meanings
The lowestfour bits of the software configuration register (bits 3, 2, 1, and 0) form the boot field. (See
Table 10.)The boot field specifies a number in binary form. If you set the boot field valueto 0, you must
boot the operating system manually by entering the bcommand at the bootstrap prompt (>), as follows:
> b [tftp] flash
filename
Definitions of the variousbcommand options follow:
•b—Boots the default system software from Flash memory
•b flash—Boots the first file in onboard Flash memory
•b slot0: filename—Boots the file filename from the Flash Disk in PC Card slot 0
•b slot1: filename—Boots the file filename from the Flash Disk in PC Card slot 1
•bfilename [host]—Boots from serverhost using TFTP
•b bootflash:[filename]—Boots the file filename from onboard Flashmemory