Reference Information
Bit 8 controls the console Break key. Setting bit 8 (the factory default) causes the processor to ignore the console Break key. Clearing bit 8 causes the processor to interpret the Break key as a command to force the system into the bootstrap monitor, thereby halting normal operation. Regardless of the setting of the break enable bit, a break causes a return to the ROM monitor during the first few seconds (approximately 5 seconds) of booting.
Bit 9 is unused. Bit 10 controls the host portion of the IP broadcast address. Setting bit 10 causes the processor to use all zeros; 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 broadcast address. Table 12 shows the combined effect of bits 10 and 14.
Table 12 | Configuration Register Settings for Broadcast Address Destination | ||
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Bit 14 |
| Bit 10 | Address (<net> <host>) |
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Off |
| Off | <ones> <ones> |
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Off |
| On | <zeros> <zeros> |
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On |
| On | <net> <zeros> |
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On |
| Off | <net> <ones> |
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Bits 11 and 12 in the configuration register determine the baud rate of the console terminal. Table 13 shows the bit settings for the four available baud rates. (The
Table 13 System Console Terminal Baud Rate Settings
Baud | Bit 12 | Bit 11 |
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9600 | 0 | 0 |
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4800 | 0 | 1 |
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1200 | 1 | 0 |
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2400 | 1 | 1 |
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Bit 13 determines the server response to a bootload failure. Setting bit 13 causes the server to load operating software from Flash memory after five unsuccessful attempts to load a boot file from the network. Clearing bit 13 causes the server to continue attempting to load a boot file from the network indefinitely. By factory default, bit 13 is cleared to 0.
Enabling a Boot from Flash Memory
To enable a boot from Flash memory, set configuration register bits 3, 2, 1, and 0 to a value between 2 and 15 in conjunction with the boot system flash device:filename configuration command, where device is bootflash:, slot0:, or slot1:, and filename is the name of the file from which you want to boot the system.
To enter global configuration mode while in the system software image and specify a Flash memory filename from which to boot, use the configure terminal privileged EXEC configuration command at the enable prompt, as follows:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# boot system flash device:filename
Route Switch Processor (RSP8) Installation and Configuration Guide
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