Cisco 7206VXR Installation Guide - Page 137

B, Configuration Register Information, Configuration Bit Meanings

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APPENDIX B Configuration Register Information The following information is found in this appendix: • Configuration Bit Meanings, page B-1 • Displaying the Configuration Register While Running Cisco IOS, page B-5 • Displaying the Configuration Register While Running ROM Monitor, page B-5 • Setting the Configuration Register While Running Cisco IOS, page B-6 • Setting the Configuration Register While Running ROM Monitor, page B-6 Configuration Bit Meanings Use the processor configuration register information contained in this appendix to do the following: • Set and display the configuration register value • Force the system into the bootstrap program • Select a boot source and default boot filename • Enable or disable the Break function • Control broadcast addresses • Set the console terminal baud rate • Load operating software from ROM • Enable booting from a Trivial File Transfer Protocol (TFTP) server Table B-1 lists the meaning of each of the configuration memory bits. Following the table is a more in-depth description of each setting. Table B-1 Configuration Register Bit Settings Bit No. 00-03 06 07 08 10 Hex 0x0000-0x000F 0x0040 0x0080 0x0100 0x0400 Meaning Boot field Causes the system software to ignore nonvolatile random-access memory (NVRAM) contents OEM (original equipment manufacturer) bit enabled Break disabled IP broadcast with all zeros OL-5102-02 Cisco 7206 Installation and Configuration Guide B-1

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B-1
Cisco 7206 Installation and Configuration Guide
OL-5102-02
APPENDIX
B
Configuration Register Information
The following information is found in this appendix:
•
Configuration Bit Meanings, page B-1
•
Displaying the Configuration Register While Running Cisco IOS, page B-5
•
Displaying the Configuration Register While Running ROM Monitor, page B-5
•
Setting the Configuration Register While Running Cisco IOS, page B-6
•
Setting the Configuration Register While Running ROM Monitor, page B-6
Configuration Bit Meanings
Use the processor configuration register information contained in this appendix to do the following:
•
Set and display the configuration register value
•
Force the system into the bootstrap program
•
Select a boot source and default boot filename
•
Enable or disable the Break function
•
Control broadcast addresses
•
Set the console terminal baud rate
•
Load operating software from ROM
•
Enable booting from a Trivial File Transfer Protocol (TFTP) server
Table B-1
lists the meaning of each of the configuration memory bits. Following the table is a more
in-depth description of each setting.
Table B-1
Configuration Register Bit Settings
Bit No.
Hex
Meaning
00–03
0x0000–0x000F
Boot field
06
0x0040
Causes the system software to ignore nonvolatile random-access
memory (NVRAM) contents
07
0x0080
OEM (original equipment manufacturer) bit enabled
08
0x0100
Break disabled
10
0x0400
IP broadcast with all zeros