4-7
Cisco 7500 Series Installation and Configuration Guide
OL-5008-03 B0
Chapter 4 Performing a Basic Configuration of the System
Configuring the Software Configuration Register
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.
Changing Configuration Register Settings
To change the configuration register while running the system software, follow these steps:
Step 1
At the bootstrap prompt (>), enter the enable command and your password to enter privileged level, as
follows:
Router> enable
Password:
router#
Step 2
At the privileged-level system prompt (
Router #
), enter the configure terminal
command to enter
configuration mode. You are prompted, as shown in the following example:
Router# conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#
Step 3
Set the contents of the configuration register by entering the config-register value configuration
command, where value is a hexadecimal number preceded by 0x (see
Table 4-1
), as in the following
example:
Router(config)# config-register 0xvalue
Step 4
Enter Ctrl-Z to exit configuration mode.
Step 5
Save the new settings to NVRAM by entering the copy running-config startup-config command. The
new settings do not take effect until the system software is reloaded by rebooting the router.
Step 6
Display the configuration register value currently in effect and that will be used at the next reload by
entering the show version EXEC command. The value is displayed on the last line of the screen display,
as in the following example:
Configuration register is 0x141 (will be 0x101 at next reload)
Step 7
Reboot the router. The new value takes effect. Configuration register changes take effect only when the
system reloads, such as when you issue a reload command from the console.
Table 4-5
Console Terminal Transmission Rates
Baud
Bit 12
Bit 11
9600
0
0
4800
0
1
2400
1
1
1200
1
0
