Cisco 10005 Instalační příručka stáhnout pdf (Strana 23)

Cisco 10000 Series Router Performance Routing Engine Installation

OL-3971-03

Managing System Boot Parameters

• The behavior of the Break function

By modifying the boot parameters, you can customize your Cisco 10000 series router. For example, a

common configuration register setting in some lab environments is 0x2100. Using this setting, the

system boots to the ROM monitor prompt, where a technician can load a specific image by entering the

boot command at the rommon prompt. (For more information, see the Cisco IOS Configuration

Fundamentals Configuration Guide.)

Changing the Software Configuration Register Settings

To change the software configuration register settings while you are running system software, perform

the following steps:

Step 1 From global configuration mode, enter the config-register value command to set the contents of the

software configuration register; value is a hexadecimal number preceded by 0x. For example:

Router(config)# config-register 0x2100

Consult the hexadecimal column in Table 3 for the possible settings to enter as the 4-bit value parameter.

Step 2 Exit global configuration mode by pressing Ctrl-Z.

Router(config)# Ctrl-Z

Router#

The new contents of the software configuration register are saved to NVRAM. These new settings do not

take effect until you reload the system or reboot the router.

Step 3 To display the new software configuration register setting, issue the show version command.

Router# show version

#Configuration register is 0x141 (will be 0x2100 at next reload)

Step 4 Save the configuration file to preserve the new software configuration register settings.

Router# copy running-config startup-config

Step 5 Reboot the router.

The software configuration register setting takes affect only after you reload the system. This happens

when you issue the reload command from the console or reboot the router.

Configuration Register Settings

Table 3 summarizes the modifications that you can make to the software configuration register. For

detailed information, refer to the Cisco IOS Configuration Fundamentals Command Reference.

Note The factory default value for the software configuration register is 0x2102. This value is a combination

of the following: binary bit 8 = 0x0100, bits 00 through 03 = 0x0002, and bit 13 = 2000.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 45 46

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Cisco 10005 Instalační příručka Strana 23