Cisco Gigabit Switch Router 12008 Installation And Configuration Manual page 225

Table 4-5 Default Boot Filenames Computed from Boot Field Bits
Action/File Name
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 is described
in the following paragraphs.
Bit 8 of the software configuration register controls the console Break function key. Setting
bit 8 (the factory default) causes the system to ignore the console Break key. Conversely,
clearing bit 8 causes the system to interpret activation of the Break key as a command,
forcing the system into the ROM monitor mode (
operation. Regardless of the setting of the break enable bit in the software configuration
register, activation of the Break key causes a return to the ROM monitor prompt during
approximately the first 5 seconds of booting.
Observing System Startup and Performing a Basic Configuration 4-41
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
rommon>
) and halting normal system