Table of Contents
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CHAPTER 9
Troubleshooting
Diagnosing Problems
Initialization Sequence
Copyright © 2010, Juniper Networks, Inc.
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
Troubleshooting Power Failures on page 96
Understanding Status LEDs to Troubleshoot on page 96
Monitoring Temperatures of Modules on page 103
Resetting Line Modules and SRP Modules on page 104
Double-Bit Errors on SRP Modules on page 104
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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Table of Contents
Troubleshooting
