Troubleshooting; Diagnosing Problems; Initialization Sequence; Chapter 9 Troubleshooting - Juniper E Series Hardware Manual

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 99
Troubleshooting Power Failures on page 100
Understanding Status LEDs to Troubleshoot on page 100
Monitoring Temperatures of Modules on page 109
Resetting Line Modules and SRP Modules on page 110
Double-Bit Errors on SRP Modules on page 110
Your initial response to a system problem should be to:
Check power connections.
1.
Observe the system's LEDs carefully.
2.
Check cable connections on the system modules.
3.
If a problem is beyond the scope of this chapter, refer to "Customer
Support" on page 145 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 E-series line module is initialized independently. As a result, the CLI on
the SRP module may become available before the line modules have completed
initialization. Commands relating to a line module may fail if the module has not
99
Diagnosing Problems