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Chapter 9
Troubleshoo
ting
This chapter explains how you can troubleshoot a speci fic problem, such as
abnormal LED activity or no system power, when you power up the router. It
contains th
efollowingsections:
Diagnosing Problems on page 103
Troubleshooting Power Failures on page 104
Understand
ing Status LEDs to Troubleshoot on page 104
Monitoring Temperatures of Modules on page 113
Resetting Line Modules and SRP Modules on pag e 114
Double-Bit
Errors on SRP Modules on page 114
Diagnosing Problems
When you first encounter a system problem:
1. Make sure power connections are securely attached.
2. Observe the system’s LEDs carefully.
3. Make sure ca
ble connections on the system modules are securely attached.
If a problem is beyond the scope of this chapter, see “Contacting Customer
Support an
d Returning Hardware” on page 151 for further instructions.
NOTE: Running the show version and show hardware commands is often a good
first step when trying to troubleshoot a problem.
Initialization Sequence
Each line module is initialized independen tly. As a result, the command-line
interface
(CLI) on the SRP module can become available before the line
modules have completed initialization. Commands relating to a line module
Diagnosing Problems 103