What is a configuration register?
Configuration Register is a special 16 bits value that can be configured in Cisco routers. It is mainly used in three cases; To determine how the router boots. To determine boot options. To set console speed.
What is config register 0x2102?
The factory-default setting for the configuration register is 0x2102. This indicates that the router should attempt to load a Cisco IOS software image from Flash memory and load the startup configuration.
What is config register 0xf?
Config-Register is basically a hexadecimal or decimal value that represents. the 16-bit configuration register value that will be used the next time the switch is. restarted. The value range is from 0x0 to 0xFFFF (0 to 65535 in decimal).
How do I get my router out of Rommon mode?
If your router gets stuck in ROMmon mode during the boot process, examine the value of the configuration register by entering the confreg command. Change the value of the configuration register as shown below to stop the router to go into the ROMmon mode after reloading.
What is ROMmon mode Cisco?
The ROM Monitor (ROMMON) is a bootstrap program that initializes the hardware and boots the Cisco IOS XE software when you power on or reload a router. If your router does not find a valid system image to load when it is booting, the system enters the ROMMON mode.
How do you switch ROMmon mode?
If the switch continuously reboots, press Control-C to prevent autoboot and to get into ROMmon mode.
What is the default value of config Register 0x2102?
The default value of Config Register is 0x2102. With Configuration Register 0x2102 value, the router boots from NVRAM and the normal router precedures works. The configuration stored in NVRAM is the startup configuration.
How can I find the meaning of my configuration register settings?
For information on the meaning of your configuration register setting, including potential issues and fixes, collect the output of the show version command, or the show tech-support command, and input into the Cisco CLI Analyzer ( registered customers only) tool.
What is configuration register 0x0002-0x000f?
0x0002-0x000F- Specifies a default netboot filename. Enables boot system commands that override the default netboot filename. Causes the system to use the secondary bootstrap. This is typically not used (set to 0). An inappropriately set configuration register can cause many problems, such as:
What is the default configuration register value for a Cisco router?
The factory-default setting for the configuration register is 0x2102. This indicates that the router should attempt to load a Cisco IOS ® software image from Flash memory and load the startup configuration with a console speed of 9600 baud. Configuration Register Values and their Meaning