Appendix A Configuration Register Information

Setting the Configuration Register While Running Cisco IOS

09Do not use secondary bootstrap

08Break disabled

07OEM disabled

06Ignore configuration disabled

05Fast boot disabled

04Fan boot disabled

03-00 Boot to ROM monitor

If the prompt is “rommon1”, the confreg command displays the virtual configuration register currently in effect. It includes a description of the bits. See the following sample output:

rommon 1 > confreg

Configuration Summary enabled are:

load rom after netboot fails console baud: 9600

boot: the ROM Monitor

Do you wish to change the configuration? y/n [n]

Setting the Configuration Register While Running Cisco IOS

The configuration register can be set in the configuration mode with the config-register 0x<value> command. See the following sample output:

Router# config t

Enter configuration commands, one per line. End with CNTRL/Z.

Router(config)#config-register 0x2142

Router(config)#end

Router#

%SYS-5-CONFIG_I: Configured from console by console

Setting the Configuration Register While Running ROM Monitor

If the prompt is “>”, the or0x<value> command sets the configuration register. See the following sample output:

>o/r 0x2102

>

If the prompt is “rommon1”, the confreg command sets the configuration register. It prompts the user about each bit. See the following sample output:

 

 

 

rommon

1

> confreg

 

 

 

 

 

 

 

 

Confiuration Summary

 

 

 

 

 

 

 

 

enabled are:

 

 

 

 

 

 

 

 

 

load rom

after netboot fails

 

 

 

 

 

 

 

 

console baud:

9600

 

 

 

 

 

 

 

 

boot: the ROM

Monitor

 

 

 

 

 

 

 

 

do you

wish to change the configuration

y/n

[n]:

y

 

 

 

enable

 

“diagnostic mode”? y/n

[n]:

n

 

 

 

 

 

 

enable

 

“use

net in IP bcast address”?

y/n

[n]:

n

 

 

 

disable

 

“use

rom after netboot fails”?

y/n

[n]:

n

 

 

 

enable

 

“use

all zero broadcast”? y/n

[n]:

n

 

 

 

 

 

enable

 

“break/abort has effect”? y/n

[n]:

n

 

 

 

 

 

Cisco 7500 Series Installation and Configuration Guide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A-6

 

 

 

 

 

 

 

 

OL-5008-03 B0

 

 

 

 

 

 

 

 

 

 

 

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Cisco Systems 7500 Series manual Setting the Configuration Register While Running Cisco IOS