Appendix C Configuration Register Information
Displaying the Configuration Register While Running Cisco IOS
Bit 15
Bit 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 show hardware command. The following is sample output of the show version command from a Cisco 7201 router.
Router# show version
Cisco IOS Software, 7200 Software
ROM: System Bootstrap, Version 12.4(4r)XD5, RELEASE SOFTWARE (fc1)
BOOTLDR: Cisco IOS Software, 7200 Software
INTERIM SOFTWARE
c7201alpha1 uptime is 5 days, 18 hours, 32 minutes System returned to ROM by
This product contains cryptographic features and is subject to United States and local country laws governing import, export, transfer and use. Delivery of Cisco cryptographic products does not imply
Importers, exporters, distributors and users are responsible for compliance with U.S. and local country laws. By using this product you agree to comply with applicable laws and regulations. If you are unable to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at: http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to export@cisco.com. Cisco 7201 (c7201) processor (revision A) with 917504K/65536K bytes of memory.
Processor board ID 2222222222222
MPC7448 CPU at 1666Mhz, Implementation 0, Rev 2.2 1 slot midplane, Version 2.255
Last reset from
4 Gigabit Ethernet interfaces
2045K bytes of NVRAM.
62443K bytes of USB Flash usbflash0 (Read/Write)
250880K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).
65536K bytes of Flash internal SIMM (Sector size 512K). Configuration register is 0x2
Displaying the Configuration Register While Running ROM Monitor
If the bootstrap prompt is “>”, the o command displays the virtual configuration register currently in effect. It includes a description of the bits. See the following sample output:
>o |
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Configuration | register + | 02x100 | at last boot | |
Bit# | Configuration | register option settings: | ||
15 | Diagnostic mode disabled | |||
14 | IP | broadcasts | do not | have network numbers |
13Boot default ROM software if network boot fails
10IP broadcasts with ones
Cisco 7201 Installation and Configuration Guide
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