Cisco CSR 1000v Series User Manual

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Use the ^ and v keys to select which entry is highlighted.
Press enter to boot the selected OS, or 'c' for a command-line.
Select the image to boot the router from using the up and down arrow key. To return to the GRUB prompt,
enter the letter c.
Modifying the Configuration Register (confreg)
This section describes how to modify the configuration register by using the confreg GRUB command. This
command is similar to the confreg ROMMON command on other Cisco hardware routers. Because the Cisco
CSR 1000v does not include a ROMMON mode, the similar functionality is handled in the GRUB command
mode.
You can also modify the configuration register setting from the Cisco IOS CLI by using the config-register
command in global configuration mode.
The modified configuration register value is automatically written into NVRAM, but the new value does
not take effect until you reset or power-cycle the router.
Note
SUMMARY STEPS
1.
confreg [value]
DETAILED STEPS
PurposeCommand or Action
Changes the configuration register settings while in GRUB command mode.
confreg [value]
Step 1
Example:
grub> confreg 0x2102
•
Optionally, enter the new hexadecimal value for the configuration register.
The value range is from 0x0 to 0xFFFF.
•
If you do not enter the value, the router prompts for each bit of the 16-bit
configuration register.
Cisco CSR 1000v Series Cloud Services Router Software Configuration Guide
224
Accessing and Using GRUB Mode
Modifying the Configuration Register (confreg)

Cisco CSR 1000v Series Specifications

General

Brand	Cisco
Model	CSR 1000v Series
Category	Network Router
Language	English