Observing System Startup andPerforming a Basic Configuration 4-41
Performing Other Configuration Tasks
Table4-5 Default Boot Filenames Computed from Boot Field Bits
The significance of other important bits in the software configuration regist er 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 (rommon>) and halting normal system
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.
Action/File Name 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