Cisco Systems 7500 Series manual Action/Filename Bit, Bit Address net host

Chapter 4 Performing a Basic Configuration of the System

Configuring the Software Configuration Register

Table 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-RSP		0	0	1	0
cisco3-RSP		0	0	1	1
cisco4-RSP		0	1	0	0
cisco5-RSP		0	1	0	1
cisco6-RSP		0	1	1	0
cisco7-RSP		0	1	1	1
cisco10-RSP		1	0	0	0
cisco11-RSP		1	0	0	1
cisco12-RSP		1	0	1	0
cisco13-RSP		1	0	1	1
cisco14-RSP		1	1	0	0
cisco15-RSP		1	1	0	1
cisco16-RSP		1	1	1	0
cisco17-RSP		1	1	1	1

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 will cause 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 4-4shows the combined effect of bit 10 and bit 14.

Table 4-4	Configuration Register Settings for Broadcast Address Destination
Bit 14		Bit 10	Address (<net> <host>)
Off		Off	<ones> <ones>
Off		On	<zeros> <zeros>
On		On	<net> <zeros>
On		Off	<net> <ones>

Bit 11 and bit 12 in the configuration register determine the data transmission rate of the console terminal. Table 4-5shows the bit settings for the four available rates. (The factory-set default data transmission rate is 9600.)

Cisco 7500 Series Installation and Configuration Guide

4-6 OL-5008-03 B0