Cisco Systems 78-16019-02 Changing the Software Configuration Register, Switch# show version

Chapter 3 Initial Configuration

Changing the Software Configuration Register

Changing the Software Configuration Register

	To change the configuration register, perform the following steps:
	Command	Purpose
Step 1
	Switch# configure terminal	Enters global configuration mode.
	Switch(config)#
Step 2
	Switch(config)# config-registervalue	Sets the contents of the configuration register. The value is
		a hexadecimal number preceded by 0x. See Table 3-4for
		the list of values.
		Note The new configuration register value takes effect
		at the next system reload.
Step 3
	Switch(config)# end	Returns to privileged EXEC mode.
	Switch#
Step 4
	Switch# reload	(Optional) Reloads the system using the new
		configuration register value.
Note	The factory default value for the register is 0x2102.
	Example

The following example shows how to configure the system to manually boot from the ROMMON prompt:

Switch# configuration terminal

Switch(config)# config-register 0x100

Switch(config)# end

Switch# reload

Verify the Configuration Register Value

To verify the configuration register value, use the following EXEC command:

Command	Purpose
Switch# show version	Displays the current configuration register value.
	This value is used at the next system reload.

Example

The following example shows how to configure the system to examine the startup configuration file for boot system options:

Switch# show version

<Information deleted>

Configuration register is 0x2102 (will be 0x100 at next reload)

	Cisco ONS 15530 Configuration Guide and Command Reference
78-16019-02, Cisco IOS Release 12.2(18)SV2		3-29