Cisco WS-C4003-RF Hardware Maintenance Manual - Page 117

Cisco 4000 Series Virtual Configuration Register, Virtual Configuration Register Settings

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APPENDIX B Cisco 4000 Series Virtual Configuration Register This appendix describes the Cisco 4000 series virtual configuration register, the factory default settings, and the procedures for changing those settings. Virtual Configuration Register Settings The Cisco 4000 series has a 16-bit virtual register, which is written into the nonvolatile random access memory (NVRAM). 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 virtual configuration memory bits. Table B-1 Virtual Configuration Bit Meanings Bit No. Hex Meaning 00-03 0x0000-0x000F Boot field (see Table B-2) 06 0x0040 Causes system software to ignore nonvolatile memory contents 07 0x0080 OEM bit enabled 08 0x0100 Break disabled 10 0x0400 IP broadcast with all zeros 11-12 0x0800-0x1000 Console line speed 13 0x2000 Boots default ROM software if network boot fails 14 0x4000 IP broadcasts do not have net numbers 15 0x8000 Enables diagnostic messages and ignores NVRAM contents Cisco 4000 Series Virtual Configuration Register B-1

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APPENDIX
Cisco 4000 Series Virtual Configuration Register
B-1
Cisco 4000 Series Virtual
Configuration Register
B
This appendix describes the Cisco 4000 series virtual configuration register, the factory default
settings, and the procedures for changing those settings.
Virtual Configuration Register Settings
The Cisco 4000 series has a 16-bit virtual register, which is written into the nonvolatile random
access memory (NVRAM). 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 virtual configuration memory bits.
Table B-1
Virtual Configuration Bit Meanings
Bit No.
Hex
Meaning
00–03
0x0000–0x000F
Boot field (see Table B-2)
06
0x0040
Causes system software to ignore nonvolatile memory contents
07
0x0080
OEM bit enabled
08
0x0100
Break disabled
10
0x0400
IP broadcast with all zeros
11–12
0x0800–0x1000
Console line speed
13
0x2000
Boots default ROM software if network boot fails
14
0x4000
IP broadcasts do not have net numbers
15
0x8000
Enables diagnostic messages and ignores NVRAM contents