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Chapter 4 System Startup and Basic System Configuration
Configuring the Software Configuration Register
4-38
Cisco 12010, Cisco 12410, and Cisco 12810 Router Installation and Configuration Guide
OL-11496-01
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 TFTP-bootable Cisco
IOS software image (cisco2-grp through cisco17-grp or cisco2-prp through
cisco17-prp).
Table 4-6 Default Boot Filenames
Action/Filename Bit 3 Bit 2 Bit 1 Bit 0
Bootstrap mode 0 0 0 0
Default software 0 0 0 1
cisco2-grp or cisco2-prp 0 0 1 0
cisco3-grp or cisco3-prp 0 0 1 1
cisco4-grp or cisco4-prp 0 1 0 0
cisco5-grp or cisco5-prp 0 1 0 1
cisco6-grp or cisco6-prp 0 1 1 0
cisco7-grp or cisco7-prp 0 1 1 1
cisco10-grp or cisco10-prp 1 0 0 0
cisco11-grp or cisco11-prp 1 0 0 1
cisco12-grp or cisco12-prp 1 0 1 0
cisco13-grp or cisco13-prp 1 0 1 1
cisco14-grp or cisco14-prp 1 1 0 0
cisco15-grp or cisco15-prp 1 1 0 1
cisco16-grp or cisco16-prp 1 1 1 0
cisco17-grp or cisco17-prp 1 1 1 1