User guide

B-22 Cisco 2500 Series Access Server User Guide

Virtual Configuration Register Settings

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. A break can be sent in the ﬁrst 60 seconds while the system reboots, regardless

of the conﬁguration settings.

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. (See Table B-5.)

Table B-5 Conﬁguration Register Settings for Broadcast Address Destination

Bits 11 and 12 in the conﬁguration register determine the baud rate of the console terminal.

Table B-6 shows the bit settings for the four available baud rates. (The factory-set default

baud rate is 9600.)

Table B-6 System Console Terminal Baud Rate Settings

Bit 14 Bit 10 Address (<net> <host>)

Off Off <ones> <ones>

Off On <zeros> <zeros>

On On <net> <zeros>

On Off <net> <ones>

Baud Bit 12 Bit 11

9600 0 0

4800 0 1

1200 1 0

2400 1 1