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Cisco CSR 1000V Series Cloud Services Router Software Configuration Guide
OL-27477-07
Chapter11 Accessing and Using GRUB Mode
Using the GRUB Menu
The following shows an example of entering GRUB mode.
Router(config)# config-register 0x0000
GNU GRUB version 0.97 (638K lower / 3143616K upper memory)
[ Minimal BASH-like line editing is supported. For the first word, TAB
lists possible command completions. Anywhere else TAB lists the possible
completions of a device/filename. ESC at any time exits to menu. ]
grub> help
[ Minimal BASH-like line editing is supported. For the first word, TAB
lists possible command completions. Anywhere else TAB lists the possible
completions of a device/filename. ESC at any time exits to menu. ]
confreg [VALUE] help [--all] [PATTERN ...]
grub>
If you enter a question mark at the grub> prompt, the system shows you the two options available, for
either viewing the system help or for entering the confreg command.
Using the GRUB Menu
The GRUB menu is used to display the software images loaded on the router, and to select which image
to boot from. To access the GRUB menu, enter ESC at the GRUB prompt. The following shows the
GRUB menu display.
GNU GRUB version 0.97 (638K lower / 3143616K upper memory)
+-------------------------------------------------------------------------+
| CSR1000v - csr1000v-universalk9.03.10.00.S.153-3.S-ext.SPA.bin |
| CSR1000v - packages.conf |
| CSR1000v - GOLDEN IMAGE |
| |
| |
| |
| |
| |
| |
| |
| |
| |
+-------------------------------------------------------------------------+
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.