Chapter 9
Troubleshooting
Diagnosing Problems
Initialization Sequence
This chapter explains how you can troubleshoot a specific problem, such as abnormal
LED activity or no system power, when you power up the router. It contains the
following sections:
Diagnosing Problems on page 95
When you first encounter a system problem:
Make sure power connections are securely attached.
1.
Observe the system's LEDs carefully.
2.
Make sure cable connections on the system modules are securely attached.
3.
If a problem is beyond the scope of this chapter, see "Contacting Customer Support
and Returning Hardware" on page 139 for further instructions.
NOTE: Running the show version and show hardware commands is often a good
first step when trying to troubleshoot a problem.
Each line module is initialized independently. 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 might fail if the module
has not completed initialization. Use the show version command to display line
module status. Do not enter commands for a line module until its state is listed as
online.
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Diagnosing Problems