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 0x2142 config register?
Configuration register is 0x2142. In this example, the configuration register shows 0x2142. The router bypasses the startup configuration stored in NVRAM during its boot sequence. This feature is normally used during a password recovery procedure.
How do I find my config register?
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 is configuration register in Cisco switch?
Cisco IOS routers and switches use a configuration register for some specific settings. These are settings that are not stored in the startup or running configuration. There are 16 bits (4 hexadecimal digits) reserved for the configuration register.
Why would a router boots and enters the setup mode?
First, why does a router go into Setup Mode in the first place? When a Cisco router boots up, the router looks into Non-Volatile RAM (NVRAM) for the startup configuration file. If such a file is not found, and the router has not been programmed to look to a TFTP server for this file, the router enters setup mode.
What is configuration 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 configure config register in ROMmon?
How configure config register in ROMmon?
Boot into the ROMmon mode.Change the configuration register such that the startup config is not loaded.Boot into IOS.Go to the privileged exec mode and copy startup config to running config.Change the passwords.Save the running config to startup config.
What is bootstrap in Cisco router?
The initial software that runs on a Cisco router is called the bootstrap software and is usually stored in ROM. The bootstrap software is invoked when the router boots up. Flash—Flash memory is located on a processor board SIMM but can be expanded using PCMCIA (removable) cards.
Why would you configure a switch with an IP address?
If you want to be able to manage your switch remotely over the network, your switch needs an IP address. If your switch has multiple VLANs configured, and you want to be able to manage the switch from each VLAN, the switch requires an IP address on a VLAN interface in each VLAN.
How do I reset my Cisco 2800 router password?
Method 2
xhut the router down.Remove the compact flash from the back of the router.Turn the router back on.When you see the Rommon1> prompt, enter the command of confreg 0x2142.Insert the compact flash.Type reset.When prompted to enter the initial configuration, type no and press enter.
What components are involved in configuration management?
Configuration Management(CM) is the discipline that ensures that the state of the software at any given time is known and reconstructable. CM comprises three basic elements: Configuration identification (CID), Configuration Control (CC), and Configuration Accounting (CA).
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.
How do you reset a Cisco router?
Reset Router to Default Configuration
With the router powered off, connect the power cord to your router, and plug the power cord into your power source.Find the Reset button on the router.Press and hold the Reset button while you power on the router.Release the Reset button after 10 seconds.
What message would you expect to see when the router boots?
When the router boots, it looks for the IOS image in the following locations: ROM, Flash, Locations specified by the boot system statement in startup-config, Default TFTP server.
What are different configuration modes in switch?
These are the main command modes for the switch:
• User EXEC.• Privileged EXEC.• Global configuration.• Interface configuration.• Config-vlan.• VLAN configuration.• Line configuration.
