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Observing System Startup and Performing a Basic Configuration 4-25
Implementing Other Configuration Tasks
Table 4-3
Software Configuration Register Bit Meanings
Table 4-4
Explanation of Boot Field (Configuration Register Bits 00 to 03)
Bit Number
1
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).
Hexadecimal
Meaning
00 to 03
0x0000 to 0x000F
Boot field (see Table 4-4)
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
Internet Protocol (IP) broadcast with all zeros
11 to 12
0x0800 to 0x1000
Console line speed (default is 9600 baud)
13
0x2000
Boot default Flash software if network boot fails
14
0x4000
IP broadcasts do not have network numbers
15
0x8000
Enable diagnostic messages and ignore NVRAM contents
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 filename for booting over the network.
Enables boot system commands that override the default filename.
Summary of Contents for Gigabit Switch Router Cisco 12012
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