Chapter 4 System Startup and Basic System Configuration
Configuring the Software Configuration Register
Note If a bootable Cisco IOS software image exists in a flash memory card installed in slot 0 or slot 1, the configuration register setting is overridden, and the bootable Cisco IOS software image is booted instead of the default
Table
Action/Filename | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
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Bootstrap mode | 0 | 0 | 0 | 0 |
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Default software | 0 | 0 | 0 | 1 |
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0 | 0 | 1 | 0 | |
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0 | 0 | 1 | 1 | |
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0 | 1 | 0 | 0 | |
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0 | 1 | 0 | 1 | |
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0 | 1 | 1 | 0 | |
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0 | 1 | 1 | 1 | |
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1 | 0 | 0 | 0 | |
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1 | 0 | 0 | 1 | |
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1 | 0 | 1 | 0 | |
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1 | 0 | 1 | 1 | |
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1 | 1 | 0 | 0 | |
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1 | 1 | 0 | 1 | |
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1 | 1 | 1 | 0 | |
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1 | 1 | 1 | 1 | |
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| Cisco 12010, Cisco 12410, and Cisco 12810 Router Installation and Configuration Guide |
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