System information

Troubleshooting Hardware and Booting Problems 3-41
Troubleshooting Booting Problems
Note Before accessing the chassis interior and removing any cards, turn off power to the chassis.
Use extreme caution around the chassis. Potentially harmful voltages are present.
Note To prevent damage to components that are sensitive to electrostatic discharge (ESD), attach
ESD protection before opening a chassis. Make certain that the power cord is connected but that
power is off. ESD damage prevention guidelines are provided in the hardware installation and
maintenance publication for your router.
If a part replacement appears to solve a problem, reinstall the suspect part to verify the failure.
Always double-check a repair.
Troubleshooting Booting Problems
This section discusses troubleshooting procedures for connectivity problems related to booting. It
describes specific booting symptoms, the problems that are likely to cause each symptom, and the
solutions to those problems.
Booting: Router Fails to Boot from Flash Memory
Symptom: When a user is booting a router from Flash memory, the boot process appears to
complete, but the router does not route traffic or communicate with neighbors. exec commands might
or might not appear to function.
Table 3-11 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 3-11 Booting: Router Fails to Boot from Flash Memory