Configuration Register Values

Configreg:

You can understand the relevance of your configuration register’s value if you are aware of its value. The output of the show version or show tech-support commands can be collected and entered into the Cisco CLI Analyzer (registered customers only) tool to obtain details about the configuration register, potential problems, and remedies.

Some typical parameters that are applicable to most platforms are listed in this table.

Configuration Register Set At	Router Behavior
0x102	Ignores break 9600 console baud rate
0x1202	1200 baud rates
0x2101	Boots into bootstrap Ignores break Boots into ROM if initial boot fails 9600 console baud rates
0x2102	Ignores break Boots into ROM if initial boot fails 9600 console baud rate default value for most platforms
0x2120	Boots into ROMmon 19200 console speed
0x2122	Ignores break Boots into ROM if initial boot fails 19200 console baud rates
0x2124	NetBoot Ignores break Boots into ROM if initial boot fails 19200 console speed
0x2142	Ignores break Boots into ROM if initial boot fails 9600 console baud rates Ignores the contents of Non-Volatile RAM (NVRAM) (ignores configuration)
0x2902	Ignores break Boots into ROM if initial boot fails 4800 console baud rates
0x2922	Ignores break Boots into ROM if initial boot fails 38400 console baud rates
0x3122	Ignores break Boots into ROM if initial boot fails 57600 console baud rates
0x3902	Ignores break Boots into ROM if initial boot fails 2400 console baud rates
0x3922	Ignores break Boots into ROM if initial boot fails 115200 console baud rates

Find out which bits were set to compute the value if the value you have for the configuration register is not in the table:

Bit number	Hex	Significance
00-03	0x0000-0x000F	Field Specifications for Boots: Remains at the system bootstrap prompt with the value 0x0000. The first system image in the onboard Flash memory is booted at 0x0001 (EPROM). A default netboot filename is defined by the value 0x0002-0x000F. allows for boot system instructions to be used instead of the netboot filename that is normally used.
06	0x0040	Ignore NVRAM contents
07	0x0080	Disable boot messages
08	0x0100	Break disabled
09	0x0200	This causes the system to select the secondary bootstrap. This is typically not used (set to 0).
10	0x0400	IP broadcast with all zeros
5 11 12	0x0020, 0x0800, 0x1000	Console line speed
13	0x2000	If the network boot fails, start the ROM software by default.
14	0x4000	IP broadcasts lack network numbers.
15	0x8000	Makes diagnostic messages possible Ignores the contents of NVRAM

Uses of Configuration Register in Cisco Router

Computers and other devices are connected to the Internet using routers. A router serves as a dispatcher, determining the most efficient path for your data to take. It links your company to the outside world, safeguards data from security risks, and even determines which computers receive priority over others. A router enables you to connect numerous devices to the Internet and each other. Additionally, setting up of device local networks can also be done using routers. If you wish to transfer files between devices or allow staff to share software tools, these local networks can be helpful.

Configuration Register Values

Configreg:

Uses of Configuration Register in Cisco Router

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Configuration Register Values

Configreg:

Uses of Configuration Register in Cisco Router

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