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Chapter 4 Troubleshooting the Installation
Performing Other Configuration Tasks
4-10
Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
Bit 8—Bit 8 of the software configuration register controls the console Break key.
Setting bit 8 causes the system to ignore the console Break key. This is the factory
default. Conversely, clearing bit
8 causes the system to interpret a Break
keystroke as a command to halt normal system operation and force the system into
ROM monitor mode. Regardless of the setting of the Break enable bit in the
software configuration register, pressing the Break key during approximately the
first 5 seconds of booting causes a return to the ROM monitor.
Bit 9—Bit 9 is not used.
Bits 10 and 14—Bit 10 of the software configuration register controls the host
portion of the IP broadcast address. Setting bit 10 causes the processor to use all
zeros in the host portion of the IP broadcast address; clearing bit 10 (the factory
default) causes the processor to use all ones. Bit 10 interacts with bit 14, which
controls the network and subnet portions of the IP broadcast address.
Table 4-4
shows the combined effect of bits 10 and 14.
Bits 11 and 12—Bits 11 and 12 of the software configuration register determine
the data transmission rate of the console terminal.
Table 4-5 shows the bit settings
for the four available data transmission rates. The factory-set default data
transmission rate is 9600
bps.
Ta b l e 4-4 Configuration Register Settings for Broadcast Address
Destination
Bit 10 Bit 14 Address (<net> <host>)
Off Off <ones> <ones>
On Off <zeros> <zeros>
On On <net> <zeros>
Off On <net> <ones>
Ta b l e 4-5 System Console Terminal Data Transmission Rate Settings
Bit 12 Bit 11 Data Transmission Rate (bps)
0 0 9600
0 1 4800
1 0 1200
1 1 2400