Cisco 12406 User Manual
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Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
Chapter 4 Troubleshooting the Installation
Performing Other Configuration Tasks
Note
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).
The significance of bits 8 through 14 in the software configuration register
follows.
Table 4-3
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