Changing Settings, Bit Meanings | Cisco Systems RSP8 guide

Reference Information

Changing Settings

To change the configuration register while running the system software, follow these steps:

Step 1 To enter privileged EXEC configuration mode, use the enable command and your password as shown:

Router> enable

Password:

Router#

Step 2 To enter global configuration mode, use the configure terminal 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)#

Step 3 To set the contents of the configuration register, use the config-register 0xvalue configuration command, where value is a hexadecimal number preceded by 0x (see Table 10), as shown in the following example:

Router(config)# config-register 0xvalue

Step 4 Exit global configuration mode using Ctrl-Zor by typing end.The new configuration register settings are saved to memory; however, the new settings do not take effect until the system software is reloaded when you reboot the router.

Step 5 To display 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)

Step 6 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 lowest four 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 value to 0, you must boot the operating system manually by entering the b command at the bootstrap prompt (>), as follows:

>b [tftp] flash filename

Definitions of the various b command 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

•b filename [host]— Boots from server host using TFTP

•b bootflash: [filename]— Boots the file filename from onboard Flash memory

Route Switch Processor (RSP8) Installation and Configuration Guide

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