Modifying The Configuration Register (Confreg) - Cisco CSR 1000v Series Software Configuration Manual

Modifying the Configuration Register (confreg)

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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.
Note 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.
SUMMARY STEPS
1. confreg [value]
DETAILED STEPS
Command or Action
Step 1
confreg [value]
Example:
grub> confreg 0x2102
Cisco CSR 1000v Series Cloud Services Router Software Configuration Guide
224
Use the ^ and v keys to select which entry is highlighted.
Press enter to boot the selected OS, or 'c' for a command-line.
Purpose
Changes the configuration register settings while in GRUB command mode.
• 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.
Accessing and Using GRUB Mode
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