Cisco 3725 Hardware Installation Guide - Page 106

Bit 10, Address <net> <host&gt, boot system

Get Cisco 3725 - PRI Dial Bundle Router PDF manuals and user guides
UPC - 746320810911
View all Cisco 3725 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 106 highlights

Configuring the Boot Field Appendix C Configuration Register The boot field specifies a number in binary form. If you set the boot field value to 0, you must have console port access to boot the operating system manually. See the boot command in the "ROM Monitor Command Descriptions" section on page B-3. If you set the boot field to a value of 2 to F, and a valid boot system command is stored 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 no boot commands are in the configuration file, the router attempts to boot the first file in CompactFlash memory. In the following example, the configuration register is set to boot the router automatically from CompactFlash memory and to ignore Break at the next reboot of the router: Router# configure terminal Enter configuration commands, one per line. Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z config-register 0x102 Ctrl-z Router# Note A boot system command in the router configuration in NVRAM overrides booting from CompactFlash memory. 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 Break as a command to force the router into the bootstrap monitor, halting normal operation. Break can always be sent in the first 60 seconds while the router is rebooting, regardless of the configuration settings. Bit 9 controls the system boot. Clearing bit 9 (the factory default) causes the system to boot from CompactFlash memory. Clearing bit 9 causes the system to use the secondary bootstrap. This bit is typically not used. 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 C-3 shows the combined effect of bits 10 and 14. Table C-3 Configuration Register Settings for Broadcast Address Destination Bit 10 Bit 14 Address ( ) Off Off On Off On On Off On Bit 13 determines how the router responds to a bootload failure. Setting bit 13 causes the router to load operating software from ROM after six unsuccessful attempts to load a boot file. Clearing bit 13 causes the router to continue indefinitely to attempt loading a boot file. By factory default, bit 13 is set to 0. Bits 5, 11, and 12 of the configuration register determine the data rate of the console terminal. Table C-4 shows the bit settings for the eight available rates. (The default data rate is 9600 bps.) Cisco 3700 Series Routers Hardware Installation Guide C-4 OL-2180-08

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
C-4
Cisco 3700 Series Routers Hardware Installation Guide
OL-2180-08
Appendix C
Configuration Register
Configuring the Boot Field
The boot field specifies a number in binary form. If you set the boot field value to 0, you must have
console port access to boot the operating system manually. See the
boot
command in the
“ROM Monitor
Command Descriptions” section on page B-3
.
If you set the boot field to a value of 2 to F, and a valid
boot system
command is stored 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 no
boot
commands are in the configuration file, the router
attempts to boot the first file in CompactFlash memory.
In the following example, the configuration register is set to boot the router automatically from
CompactFlash memory and to ignore Break at the next reboot of the router:
Router#
configure terminal
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z
config-register 0x102
Ctrl-z
Router#
Note
A
boot system
command in the router configuration in NVRAM overrides booting from CompactFlash
memory.
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 Break as a command to force the
router into the bootstrap monitor, halting normal operation. Break can always be sent in the first
60 seconds while the router is rebooting, regardless of the configuration settings.
Bit 9 controls the system boot. Clearing bit 9 (the factory default) causes the system to boot from
CompactFlash memory. Clearing bit 9 causes the system to use the secondary bootstrap. This bit is
typically not used.
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 C-3
shows the
combined effect of bits 10 and 14.
Bit 13 determines how the router responds to a bootload failure. Setting bit 13 causes the router to load
operating software from ROM after six unsuccessful attempts to load a boot file. Clearing bit 13 causes
the router to continue indefinitely to attempt loading a boot file. By factory default, bit 13 is set to 0.
Bits 5, 11, and 12 of the configuration register determine the data rate of the console terminal.
Table C-4
shows the bit settings for the eight available rates. (The default data rate is 9600 bps.)
Table C-3
Configuration Register Settings for Broadcast Address Destination
Bit 10
Bit 14
Address (<net> <host>)
Off
Off
<ones> <ones>
On
Off
<zeros> <zeros>
On
On
<net> <zeros>
Off
On
<net> <ones>