Changing The Configuration Register Settings - Cisco 1941W Configuration Manual
Cisco 3900 series, cisco 2900 series,
cisco 1900 series
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Also See for 1941W:
- Hardware installation manual (102 pages) ,
- Installing and upgrading (24 pages)
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Changing the Configuration Register Settings
The following sections describe the 16-bit configuration register in NVRAM in the Cisco 3900 series,
Cisco 2900 series, and Cisco 1900 series integrated services routers (ISRs):
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About the Configuration Register
The router has a 16-bit configuration register in NVRAM. Each bit has value 1 (on or set) or value 0 (off
or clear), and each bit setting affects the router behavior upon the next reload power cycle.
You can use the configuration register to
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Table D-1
Table D-1
Bit
Number
00–03
06
07
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
About the Configuration Register, page D-1
Changing the Configuration Register Settings, page D-4
Displaying the Configuration Register Settings, page D-5
Configuring the Console Line Speed (Cisco IOS CLI), page D-5
Force the router to boot into the ROM monitor (bootstrap program)
Select a boot source and default boot filename
Enable or disable the Break function
Control broadcast addresses
Recover a lost password
Change the console line speed
describes the configuration register bits.
Configuration Register Bit Descriptions
Hexadecimal Meaning
0x0000–0x00
Boot field. The boot field setting determines whether the router loads an
0F
operating system and where it obtains the system image.
See
0x0040
Causes the system software to ignore the contents of NVRAM.
0x0080
OEM
A P P E N D I X
Table D-2
for details.
1
bit enabled.
D
D-1
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Troubleshooting
