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4-9
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.
Ta b l e 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