Cisco 12404 Installation And Configuration Manual page 179

Chapter 4 Troubleshooting the Installation
Note
Bits 8 through 14
OL-11636-01
If a bootable Cisco IOS software image exists in a Flash memory card installed in
PCMCIA slot 0 or 1, the configuration register setting is overridden, and the
bootable Cisco IOS software image will be booted instead of the default
TFTP-bootable Cisco IOS software image (cisco2-grp through cisco17-grp or
cisco2-prp through cisco17-prp).
Table 4-3 Default Boot Filenames
Action/Filename
Bootstrap mode
Default software
cisco2-grp or cisco2-prp
cisco3-grp or cisco3-prp
cisco4-grp or cisco4-prp
cisco5-grp or cisco5-prp
cisco6-grp or cisco6-prp
cisco7-grp or cisco7-prp
cisco10-grp or cisco10-prp
cisco11-grp or cisco11-prp
cisco12-grp or cisco12-prp
cisco13-grp or cisco13-prp
cisco14-grp or cisco14-prp
cisco15-grp or cisco15-prp
cisco16-grp or cisco16-prp
cisco17-grp or cisco17-prp
The significance of other important bits in the software configuration register
follows.
Cisco 12404 Internet Router Installation and Configuration Guide
Performing Other Configuration Tasks
Bit 3 Bit 2 Bit 1 Bit 0
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
4-9