M NEXUS INSIGHT
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What is config register 0x2102?

By Rachel Hickman

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 0x102?

The most common configuration register settings are 0x102 and 0x2102. When the configuration register is set to 0x0102, it has the Break key disabled when the router is operating, and it looks into the configuration to determine the boot sequence.

How do I change the configuration register value?

In Rommon mode, it can be change with “confreg” command. Below, we are changing Configuration Register as 0x2142. After this configurationi we should reset the router to use this new value,or to force the router boot through this config register.

How do I boot into ROMmon mode?

To manually boot into the ROMmon mode, you will need to reboot the device and break the boot sequence. Pressing the Ctrl+Break key combination during boot usually does this.

How do I find my Conf registration?

To view the current setting of the configuration register, establish a console or Telnet session with the router. Issue the show version command, and input the contents into the Output Interpreter.

What does configuration register value represents in Cisco?

The factory default value for the software configuration register of a Cisco 7500 Series Router is 0x0101. This value is a combination of the following: binary bit 8 = 0x0100 and bits 00 through 03 = 0x0001. This default value may also be different for different series routers.

How do I change the configuration register value on a Cisco router?

To change the configuration register settings from the Cisco IOS CLI, complete the following steps:

  1. Connect a terminal or PC to the router console port.
  2. Configure your terminal or terminal emulation software for 9600 baud (default), 8 data bits, no parity, and 2 stop bits.
  3. Power on the router.

How can I see my configuration register?