System information

Troubleshooting Booting Problems
Book Title
3-42
Possible Problem Solution
Incorrect or corrupted image
(exec does not function)
Step 1 Check the configuration register using the show version exec
command. Set the register to boot from Flash memory. For
information about configuration register settings, refer to your
hardware installation and maintenance documentation.
Step 2 Power cycle the router.
Step 3 Within the first 60 seconds of booting, press the Break key to
access the ROM monitor.
Step 4 At the ROM monitor prompt (>), enter o/r 0x1 to set the
configuration register to boot from ROM.
Step 5 Enter i to reinitialize the router, which causes the router to
enter setup mode.
Step 6 Obtain the correct system image. If necessary, contact your
technical support representative to determine which image is
correct.
Step 7 After the correct image is identified, use the copy tftp flash
privileged exec command at the router to retrieve the image.
Step 8 Check the configuration register using the show version exec
command. Set the register to boot from Flash memory.
Step 9 Use the show running-config privileged exec command to see
whether the router configuration contains the
boot system flash global configuration command.
Note: Issuing the copy running-config startup-config
command at this point on a Cisco 2500, Cisco 3000,
Cisco 4000, or Cisco 7000 series will overwrite the
configuration. Make sure you have a backup of your
configuration file.
Incorrect or corrupted image
(exec does not function)
Step 10 Include the boot system flash command if it is not in the
configuration. Be sure to use the copy running-config
startup-config command after this change.
Step 11 Enter the reload privileged exec command to restart the router.
Syntax:
The following is the syntax for the reload command:
reload [text] | [in [hh:]mm [text]] | [at hh:mm [month day |
day month] [text]] | [cancel]
Examples:
The following example illustrates how to use the reload
command to immediately reload the software on the router:
Router# reload
The following example illustrates how to use the reload
command to reload the software on the router in 10 minutes:
Router# reload in 10
Router# Reload scheduled for 11:57:08 PDT Fri
Apr 21 1996 (in 10 minutes)
Proceed with reload? [confirm]
Router#