Cisco Systems EA6500 Manual De Usuario

The configuration register boot field determines whether or not the switch loads an operating system 
image, and if so, where it obtains this system image. The following sections describe using and setting 
the configuration register boot field, and the tasks you must perform to modify the configuration register 
boot field.

Bits 0 through 3 of the software configuration register form the boot field. 

The factory default configuration register setting for systems and spares is 0x2102.

When the boot field is set to either 0 or 1 (0-0-0-0 or 0-0-0-1), the system ignores any boot instructions 
in the system configuration file and the following occurs:

When the boot field is set to 0, you must boot the operating system manually by entering the boot 
command to the system bootstrap program or ROM monitor. 

When the boot field is set to 1, the system boots the first image in the onboard bootflash single 
in-line memory module (SIMM).

When the entire boot field equals a value between 0-0-1-0 and 1-1-1-1, the switch loads the system 
image specified by boot system commands in the startup configuration file. 

You can enter the boot command only, or enter the command and include additional boot instructions, 
such as the name of a file stored in Flash memory, or a file that you specify for booting from a network 
server. If you use the boot command without specifying a file or any other boot instructions, the system 
boots from the default Flash image (the first image in onboard Flash memory). Otherwise, you can 
instruct the system to boot from a specific Flash image (using the boot system flash filename command). 

You can also use the boot command to boot images stored in the Flash PC cards located in Flash PC card 
slot 0 or slot 1 on the supervisor engine. If you set the boot field to any bit pattern other than 0 or 1, the 
system uses the resulting number to form a filename for booting over the network. 

You must set the boot field for the boot functions you require.

11 to 12

0x0800 to 0x1000 Console line speed (default is 9600 baud)

13

0x2000

Boot default Flash software if network boot fails

14

0x4000

IP broadcasts do not have network numbers

15

0x8000

Enable diagnostic messages and ignore NVRAM contents

1.

The factory default value for the configuration register is 0x2102. 

2.

OEM = original equipment manufacturer.

00

Stays at the system bootstrap prompt

01

Boots the first system image in onboard Flash memory

02 to 0F

Specifies a default filename for booting over the network; 
enables boot system commands that override the default filename