Which Of The Following Configuration Register
Table Of Contents
Configuration Register Information
Configuration Bit Meanings
Bits 0-3
Flake half-dozen
Bit 7
Flake 8
Bit x and Bit 14
Bit xi and Bit 12
Bit 13
Bit 15
Displaying the Configuration Annals While Running Cisco IOS
Displaying the Configuration Annals While Running ROM Monitor
Setting the Configuration Register While Running Cisco IOS
Setting the Configuration Register While Running ROM Monitor
Configuration Register Information
The following data is found in this appendix:
• Configuration Bit Meanings
• Displaying the Configuration Annals While Running Cisco IOS
• Displaying the Configuration Annals While Running ROM Monitor
• Setting the Configuration Register While Running Cisco IOS
• Setting the Configuration Register While Running ROM Monitor
Configuration Bit Meanings
Use the processor configuration register data independent in this appendix to do the following:
•Ready and display the configuration register value
•Force the system into the bootstrap program
•Select a boot source and default boot filename
•Enable or disable the Intermission function
•Control broadcast addresses
•Set up the console terminal baud charge per unit
•Load operating software from ROM
•Enable booting from a Trivial File Transfer Protocol (TFTP) server
Table A-1 lists the pregnant of each of the configuration retentiveness bits. Post-obit the table is a more than in-depth description of each setting.
Chip No. | Hex | Meaning |
---|---|---|
00-03 | 0x0000-0x000F | Boot field |
06 | 0x0040 | Causes the arrangement software to ignore nonvolatile random-access memory (NVRAM) contents |
07 | 0x0080 | OEM (original equipment manufacturer) bit enabled |
08 | 0x0100 | Break disabled |
ten | 0x0400 | IP broadcast with all zeros |
11-12 | 0x800-0x1000 | Console line speed |
13 | 0x2000 | Boots default ROM software if initial boot fails |
14 | 0x4000 | IP broadcasts practise not accept network numbers |
15 | 0x8000 | Enables diagnostic messages and ignores NVRAM contents |
Bits 0-3
The lowest four bits of the processor configuration register (bits 3, ii, one, and 0) form the boot field. Tabular array A-2 provides information nigh the bits settings.
Boot Field | Meaning |
---|---|
0 | Stays at the organisation bootstrap prompt (ROM monitor) on a reload or power cycle |
one | Boots the kick helper image every bit a system image |
2 | Full boot process, which loads the Cisco IOS image into Flash retention |
two-F | Specifies a default filename for booting over the network from a TFTP server |
The boot field specifies a number in binary. If you set the kicking field value to 0, you must have a console port access to boot the operating system manually. Boot the operating system by entering the b command at the bootstrap prompt as follows:
> b [tftp] flash filename
Definitions of the diverse control options follow:
b—Boots the default organisation software from ROM
b flash—Boots the offset file in Wink retentiveness
b filename [host]—Boots over the network using TFTP
b flash filename—Boots the file (filename) from Flash memory
If yous set the boot field value to a value of 2 through F, and at that place is a valid system boot control stored in the configuration file, the router boots the arrangement software as directed by that value. (See Table A-iii.) If you set the boot field to whatever other bit blueprint, the router uses the resulting number to grade a default boot filename for netbooting.
If there are no boot commands in the configuration file, the router attempts to boot the first file in system Flash retentivity. If no file is found in system Flash memory, the router attempts to netboot a default file with a name derived from the value of the kick field (for example, cisco2-7500). If the netboot attempt fails, the kick helper prototype in boot flash memory will kicking up.
If boot commands are in the configuration file, the router software processes each boot command in sequence until the process is successful or the end of the list is reached. If the cease of the list is reached without a file existence successfully booted, the router will retry the netboot commands up to six times if bit 13 of the configuration register is ready, otherwise information technology volition load the operating organization software available in ROMmon. If fleck thirteen is not set, the router will go along to netboot images indefinitely. The default setting for bit 13 is 0. If flake 13 is set, the system boots the kick helper image establish in boot flash memory without any retries.
The server creates a default filename as part of the automatic configuration processes. To grade the kicking filename, the server starts with Cisco and links the octal equivalent of the boot field number, a dash, and the image proper name. Table A-3 lists the default kick filenames or deportment.
Note A kicking organisation configuration command in the router configuration in NVRAM overrides the default netboot filename.
Action/File Name | Chip 3 | Scrap 2 | Fleck i | Flake 0 |
---|---|---|---|---|
Bootstrap manner | 0 | 0 | 0 | 0 |
ROM software | 0 | 0 | 0 | 1 |
Wink software | 0 | 0 | ane | 0 |
cisco3-< image-name1> | 0 | 0 | 1 | one |
cisco4-<image-name2> | 0 | 1 | 0 | 0 |
cisco5-<image-name3> | 0 | 1 | 0 | one |
cisco6-<image-name4> | 0 | 1 | 1 | 0 |
cisco7-<image-name5> | 0 | 1 | 1 | 1 |
cisco10-<image-name6> | 1 | 0 | 0 | 0 |
cisco11-<image-name7> | i | 0 | 0 | 1 |
cisco12-<image-name8> | one | 0 | 1 | 0 |
cisco13-<image-name9> | i | 0 | ane | ane |
cisco14-<paradigm-name10> | 1 | ane | 0 | 0 |
cisco15-<image-name11> | 1 | 1 | 0 | 1 |
cisco16-<image-name12> | 1 | 1 | one | 0 |
cisco17-<image-name13> | 1 | 1 | 1 | 1 |
Bit 6
Chip six causes the arrangement software to ignore nonvolatile random-access retentiveness (NVRAM) contents.
Bit 7
Fleck seven enables the OEM bit. It disables the bootstrap letters at startup.
Fleck 8
Bit 8 controls the console Interruption fundamental. Setting bit 8 (the mill default) causes the processor to ignore the console Interruption primal. Clearing bit 8 causes the processor to translate Break as a command to force the organisation into the bootstrap monitor, halting normal performance. A Break tin be sent in the first threescore seconds while the arrangement reboots, regardless of the configuration settings.
Scrap ten and Scrap 14
Bit x controls the host portion of the Net IP broadcast accost. Setting bit 10 causes the processor to employ all zeros; immigration chip x (the factory default) causes the processor to use all ones. B it 10 interacts with fleck 14, which controls the network and subnet portions of the IP circulate accost. Table A-four shows the combined effect of scrap 10 and bit 14.
Bit 14 | Bit x | IP Address (<net> <host>) |
---|---|---|
Off | Off | <ones><ones> |
Off | On | <zeros><zeros> |
On | On | <internet><zeros> |
On | Off | <internet><ones> |
Chip xi and Bit 12
Bit 11 and Bit 12 in the configuration annals determine the baud charge per unit of the console terminal. Table A-5 shows the bit settings for the iv available baud rates. (The factory set default baud rate is 9600.)
Baud | Bit 12 | Bit 11 |
---|---|---|
9600 | 0 | 0 |
4800 | 0 | ane |
2400 | 1 | one |
1200 | 1 | 0 |
Bit thirteen
Bit 13 determines the server response to a bootload failure. If kick commands are in the configuration file, the router software processes each kick command in sequence until the process is successful or the terminate of the list is reached. If the stop of the listing is reached without a file existence successfully booted, the router will retry the netboot commands up to six times if fleck 13 of the configuration register is set, otherwise it will load the operating system software bachelor in ROMmon. If bit 13 is not set, the router volition go on to netboot images indefinitely. The default setting for bit 13 is 0. If flake 13 is fix, the system boots the kick helper image found in boot flash retentivity without any retries.
Bit 15
Flake 15 enables diagnostic messages and ignores NVRAM contents.
Displaying the Configuration Register While Running Cisco IOS
The configuration register can be viewed by using the show version or testify hardware control.
The following is sample output of the show version command.
Router# show version
Cisco Internetwork Operating System Software
IOS (tm) RSP Software (RSP-JSV-M), Version 12.0(10r)S1, EARLY DEPLOYMENT
MAINTENANCE Interim SOFTWARE
TAC Support:http://www.cisco.com/cgi-bin/ibld/view.pl?i=support
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Friday 22-Mar-02 sixteen:27 by ninahung
Paradigm text-base of operations:0x60010950, data-base of operations:0x612A2000
ROM:System Bootstrap, Version 12.0(10r)S1, RELEASE SOFTWARE (fc1)
UUT uptime is 2 minutes
Organization returned to ROM past reload at fifteen:33:45 UTC Tue Mar 5 2002
System image file is "disk0:rsp-pv-mz.vip6-iii.022802"
cisco RSP4+ (R5000) processor with 65536K/2072K bytes of retentivity.
R5000 CPU at 200Mhz, Implementation 35, Rev ii.i, 512KB L2 Cache
Terminal reset from power-on
Yard.703/E1 software, Version 1.0.
M.703/JT2 software, Version 1.0.
X.25 software, Version 3.0.0.
1 VIP6 RM7000B controller (ii FastEthernet).
1 GEIP controller (ane GigabitEthernet).
2 FastEthernet/IEEE 802.iii interface(s)
1 Gigabit Ethernet/IEEE 802.3 interface(due south)
123K bytes of non-volatile configuration memory.
47040K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).
16384K bytes of Wink internal SIMM (Sector size 256K).
No slave installed in slot 7.
Configuration annals is 0x0
Displaying the Configuration Register While Running ROM Monitor
If the bootstrap prompt ">", the o command displays the virtual configuration register currently in result. Information technology includes a description of the bits. Come across the following sample output:
>o
Configuration register + 02x100 at last kick
Bit# Configuration register option settings:
fifteen Diagnostic mode disabled
xiv IP broadcasts exercise not have network numbers
13 Boot default ROM software if network boot fails
12-eleven Panel speed is 9600 baud
10 IP broadcasts with ones
09 Do not use secondary bootstrap
08 Break disabled
07 OEM disabled
06 Ignore configuration disabled
05 Fast boot disabled
04 Fan boot disabled
03-00 Kicking to ROM monitor
If the prompt is "rommon1", the confreg control displays the virtual configuration register currently in effect. It includes a description of the bits. Meet the following sample output:
rommon 1 > confreg
Configuration Summary
enabled are:
load rom after netboot fails
console baud: 9600
boot: the ROM Monitor
Practice you lot wish to change the configuration? y/n [n]
Setting the Configuration Register While Running Cisco IOS
The configuration annals tin exist gear up in the configuration mode with the config-register 0x<value> command. See the following sample output:
Router# config t
Enter configuration commands, one per line. Finish with CNTRL/Z.
Router(config)#config-annals 0x2142
Router(config)
0 Response to "Which Of The Following Configuration Register"
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