3-29
Cisco ONS 15530 Configuration Guide and Command Reference
78-16019-02, Cisco IOS Release 12.2(18)SV2
Chapter 3 Initial Configuration
Changing the Software Configuration Register
Changing the Software Configuration Register
To change the configuration register, perform the following steps:
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:
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)
Command Purpose
Step 1
Switch# configure terminal
Switch(config)#
Enters global configuration mode.
Step 2
Switch(config)# config-register value Sets the contents of the configuration register. The value is
a hexadecimal number preceded by 0x. See Table 3-4 for
the list of values.
Note The new configuration register value takes effect
at the next system reload.
Step 3
Switch(config)# end
Switch#
Returns to privileged EXEC mode.
Step 4
Switch# reload (Optional) Reloads the system using the new
configuration register value.
Command Purpose
Switch# show version Displays the current configuration register value.
This value is used at the next system reload.
