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Chapter 12
Troubleshooting Hardware Components
This chapter describes how to troubleshoot problems with hardware components
installed in the router. If you encounter software problems, or problems with hardware
components not discussed here, contact the Juniper Networks Technical Assistance
Center (JTAC) as described in “Requesting Technical Support” on page xxvii.
■ Overview of Troubleshooting Resources on page 79
■ Troubleshooting the Cooling System on page 82
■ Troubleshooting DPCs on page 83
■ Troubleshooting the Power System on page 84
Overview of Troubleshooting Resources
This section provides an overview of the resources you can use while troubleshooting
problems with the router:
■ Juniper Networks Technical Assistance Center on page 79
■ Command-Line Interface on page 79
■ Chassis and Interface Alarm Messages on page 80
■ Alarm Relay Contacts on page 80
■ LEDs on page 80
Juniper Networks Technical Assistance Center
If you need assistance during troubleshooting, you can contact the Juniper Networks
Technical Assistance Center (JTAC) by using the Web or by telephone. See “Requesting
Technical Support” on page xxvii.
Command-Line Interface
The JUNOS software command-line interface (CLI) is the primary tool for controlling
and troubleshooting router hardware, the JUNOS software, routing protocols, and
network connectivity. CLI commands display information from routing tables,
information specific to routing protocols, and information about network connectivity
derived from the ping and traceroute utilities.
Overview of Troubleshooting Resources ■ 79