5-18 Cisco 7010 Hardware Installation and Maintenance
Installing and Configuring Processor Modules
Caution To avoid confusion and possibly halting the router, remember that valid configuration
register settings might be combinations of settings and not just the individual settings listed in
Table 5-4. For example, the factory default value of 0x0101 is a combination of settings.
Table 5-4 Software Configuration Register Bit Meanings
Table 5-5 Explanation of Boot Field (Configuration Register Bits 00 to 03)
Changing Settings
Some common reasons to modify the value of the software configuration register are as follows:
• Recover a lost password.
• Change the console baud rate.
• Enable or disable Break.
• Allow you to manually boot the operating system using the b command at the bootstrap program
(ROM monitor) prompt.
• Force the router to boot automatically from the system bootstrap software (boot ROM image) or
from its system image in Flash memory, and read any boot system commands that are stored in
the configuration file in NVRAM. If the router finds no boot system commands, it uses the
configuration register value to form a filename from which to netboot a default system image
stored on a network server. (See Table 5-6.)
To change the configuration register while running the system software, follow these steps:
Step 1 Enter the enable command and your password to enter privileged level, as follows:
Bit No.
1
1. The factory default value for the configuration register is 0x0101. This value is a combination of the
following: bit 8 = 0x0100 and bits 00 through 03 = 0x0001 (see Table 5-5).
Hexadecimal Meaning
00 to 03 0x0000 to 0x000F Boot field (see Table 5-5)
06 0x0040 Causes system software to ignore NVRAM contents
07 0x0080 OEM bit enabled
2
2. OEM = original equipment manufacturer.
08 0x0100 Break disabled
09 0x0200 Use secondary bootstrap
10 0x0400 Internet Protocol (IP) broadcast with all zeros
11 to 12 0x0800 to 0x1000 Console line speed (default is 9,600 baud)
13 0x2000 Boot default ROM software if network boot fails
14 0x4000 IP broadcasts do not have network numbers
15 0x8000 Enable diagnostic messages and ignore NVRAM contents
Boot Field Meaning
00 Stays at the system bootstrap prompt
01 Boots system image in system ROM
02 to 0F Specifies a default netboot filename
Enables boot system commands that override the default netboot filename
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