Appendix C Configuration Register

Configuring the Boot Field

Step 5 After a few seconds, you see the user EXEC prompt (Router>). Enter the enable command and your password to enter privileged EXEC mode:

Router> enable

Password: password

Router#

Step 6 At the privileged EXEC prompt (Router#), enter the configure terminal command:

Router# configure terminal

Enter configuration commands, one per line.

Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z

Step 7 Enter the config-registervalue command, where value is a hexadecimal number preceded by 0x (see Table C-2), to set the contents of the configuration register:

Router(config)# config-register 0x value

Note Cisco IOS software does not allow you to change the console speed bits directly with the

config-registercommand. To change the console speed, complete this sequence:

Router# configure terminal

Router(config)# line console 0

Router(config-line)# speed 9600

Step 8 Press Ctrl-Zto exit configuration mode.

Step 9 Copy the new console speed to NVRAM:

Router# copy run start

The new settings are saved to NVRAM, but they are not effective until the router restarts; for example, when you switch the power off and on or when you enter a reload command from the console.

Step 10 Enter the show version command to display the configuration register value currently in effect and the value that will be used at the next reload. The value is shown on the last line of the display:

Configuration register is 0x142 (will be 0x142 at next reload)

Step 11 Reboot the router. The new value is effective after the router reboots.

Configuring the Boot Field

The lowest four bits of the configuration register (bits 3, 2, 1, and 0) form the boot field. (See Table C-2.)

Table C-2

Explanation of Boot Field Configuration Register Bits (00 to 03)

 

 

 

Boot Field

 

Meaning

 

 

 

00

 

Stays at the ROM monitor on a reload or power cycle.

 

 

 

01

 

Boots the first image in CompactFlash memory as a system image.

 

 

 

02-F

 

Enables default booting from CompactFlash memory.

 

 

Enables boot system commands that override default booting from CompactFlash

 

 

memory.

 

 

 

Cisco 3700 Series Routers Hardware Installation Guide

 

OL-2180-08

C-3

 

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Cisco Systems 3700 Series manual Configuring the Boot Field, Boot Field Meaning
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3700 Series specifications

Cisco Systems 3700 Series routers are a pivotal part of Cisco's portfolio, designed for medium to large enterprises aiming to deliver secure and efficient networking capabilities. Introduced as a versatile solution, these routers provide a comprehensive blend of performance, scalability, and investment protection.

One of the standout features of the Cisco 3700 Series is its modular architecture, allowing organizations to customize their router according to specific needs. This modularity supports various modules for different functions, including voice, data, and video, making the 3700 Series an ideal choice for converged networking environments. Administrators can enhance functionality through an array of WAN and voice interface cards that adapt as the organization's needs evolve.

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In summary, the Cisco Systems 3700 Series routers stand out for their modularity, advanced routing capabilities, robust security features, and energy efficiency, making them an optimal choice for enterprises that not only need performance but also flexibility and reliability in their networking solutions. As businesses continue to evolve and adapt, the Cisco 3700 Series is a dependable partner in their connectivity journey, ensuring they can meet current demands while preparing for future challenges.
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