Cisco GSR12/60 - 12012 Router -AnyLAN, SONET/SDH Installation And Configuration Manual page 185

Table 4-3 Software Configuration Register Bit Meanings
1
Bit Number Hexadecimal
00 to 03 0x0000 to 0x000F
06 0x0040
07 0x0080
08 0x0100
09 0x0200
10 0x0400
11 to 12 0x0800 to 0x1000
13 0x2000
14 0x4000
15 0x8000
1. The factory default value for the configuration register is 0x0102. This value is a combination of the following: binary
bit 8 = 0x0100 and binary bits 00 through 03 = 0x0002 (see Table 4-4).
2. OEM = original equipment manufacturer.
Table 4-4
Boot Field
00
01
02 to 0F
Meaning
Boot field (see Table 4-4)
Causes system software to ignore NVRAM contents
2
OEM bit enabled
Break disabled
Use secondary bootstrap
Internet Protocol (IP) broadcast with all zeros
Console line speed (default is 9600 baud)
Boot default Flash software if network boot fails
IP broadcasts do not have network numbers
Enable diagnostic messages and ignore NVRAM contents
Explanation of Boot Field (Configuration Register Bits 00 to 03)
Meaning
Stays at the system bootstrap prompt
Boots the first system image in onboard Flash memory
Specifies a default filename for booting over the network.
Enables boot system commands that override the default filename.
Observing System Startup and Performing a Basic Configuration 4-25
Implementing Other Configuration Tasks