User guide

Maintaining the Cisco 2500 Series Access Server B-19

Virtual Configuration Register Settings

Step 2 At the privileged-level system prompt (access server #), enter the command

conﬁgure terminal. You will be prompted as shown in the following example:

router# conf term

Enter configuration commands, one per line.

Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z

Step 3 To set the contents of the conﬁguration register, enter the conﬁguration command

conﬁg-register value where value is a hexadecimal number preceded by 0x (see

Table B-2 and Table B-3):

config-register 0x

value

(The virtual conﬁguration register is stored in NVRAM.)

Table B-3 Explanation of Boot Field (Conﬁguration Register Bits 00 to 03)

Step 4

Exit conﬁguration mode by pressing Ctrl-Z. The new settings will be saved to

memory; however, the new settings do not take effect until the system software is

reloaded by rebooting the access server.

Step 5 To display the conﬁguration register value currently in effect and the value that

will be used at the next reload, enter the EXEC command show version. The value

will be displayed on the last line of the screen display:

Configuration register is 0x142 (will be 0x102 at next reload)

Boot Field Boot Process

0x0 Stops the boot process in the ROM monitor

0x1 Stops the boot process in the boot ROM monitor

0x3–0xF Speciﬁes a default ﬁlename for booting over the network from a TFTP

server

Enables boot system commands that override the default ﬁlename for

booting over the network from a TFTP server

0x2 Full boot process, load Cisco IOS software in Flash memory