
83
Route Switch Processor (RSP8) Installation and Configuration Guide
OL-4920-02
Reference Information
•
To recover a lost password
•
To allow you to manually boot the system using the b command at the bootstrap program prompt
•
To force the router to boot automatically from the system bootstrap software (boot image) or from
its default system image in onboard Flash memory, and to read any boot system commands that are
stored in the configuration file in NVRAM
If the router finds no boot system commands, it uses the configuration register value to form a filename
from which to boot a default system image stored on a network server. (See
Table 11
.)
Table 9
lists the meaning of each of the software configuration memory bits, and
Table 10
defines the
boot field.
Caution
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 9
. For example, the
factory default value of 0x0102 is a combination of settings.
Table 9
Software Configuration Register Bit Meanings
Bit Number
1
1.
The factory default value for the configuration register is 0x0102. This value is a combination of the following: bit 8 =
0x0100 and bits 00 through 03 = 0x0001 (see
Table 11
).
Hexadecimal
Meaning
00 to 0F
0x0000 to 0x000F
Boot field (see
Table 10
)
06
0x0040
Causes system software to ignore NVRAM contents
07
0x0080
OEM
2
bit enabled
2.
OEM = original equipment manufacturer
08
0x0100
Break disabled
09
0x0200
Use secondary bootstrap
10
0x0400
IP broadcast with all zeros
11 to 12
0x0800 to 0x1000
Console line speed (default is 9600 baud)
13
0x2000
Boot default Flash memory software if network boot fails
14
0x4000
IP broadcasts do not have network numbers
15
0x8000
Enable diagnostic messages and ignore NVRAM contents
Table 10
Explanation of Boot Field (Software Configuration Register Bits 00 to 0F)
Boot Field
Meaning
00
Stays at the system bootstrap prompt
01
Boots the first system image in onboard Flash memory
02 to 0F
Specifies a default network boot filename
Enables boot system commands that override the default network boot filename