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Maintaining the HP AdvanceStack Internet Router
Virtual Configuration Register Settings
Virtual Configuration Register Settings
The router has a 16-bit virtual configuration register, which is written into
NVRAM. You might want to change the virtual configuration register settings
for the following reasons:
Table 4-3 lists the meaning of each of the virtual configuration memory bits,
and defines the boot field names.
C A U T I O N
To avoid confusion and possibly halting the router, remember that valid
configuration register settings might be combinations of settings and not just
the individual settings listed in table 4-3. For example, the factory default value
of 0x2102 is a combination of settings.
Table 4-3.
a. The factory default value for the configuration register is 0x2102. This value is a combination
4-8
Set and display the configuration register value
Force the system into the ROM monitor or boot ROM
Select a boot source and default boot filename
Enable or disable the Break function
Control broadcast addresses
Set the console terminal baud rate
Recover a lost password (ignore the configuration file in NVRAM)
Enable TFTP server boot
Virtual Configuration Register Bit Meanings
a
Bit No.
Hexadecimal
00–03
0x0000–0x000F
06
0x0040
07
0x0080
08
0x0100
10
0x0400
11–12
0x0800–0x1000
13
0x2000
14
0x4000
15
0x8000
of the following: bit 13 = 0x2000, bit 8 = 0x0100, and bits 00 to 03 = 0x0002.
Meaning
Boot field
Causes system software to ignore the contents of
NVRAM (startup-config)
OEM bit is enabled
Break is disabled
IP broadcast with all zeros
Console line speed
Load the boot ROM software if a Flash boot fails five
times
IP broadcasts do not have network numbers
Enable diagnostic messages and ignore the contents
of NVRAM
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