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Chapter 11
Troubleshoot Hardware Components
This chapter desc ribes 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 “How to Request Support” on page xix.
• Overview of Troubleshooting Resources on page 121
• Troubleshoot the Fan Tray on page 124
• Troubleshoot Packet Forwarding Engine Components on page 124
• Troublesho
ot the Power System on page 125
Overview of
Troubleshooting Resources
This section provides an overview of the resources you can use while troubleshooting
problems wi
th the router:
• Command-Line Interface on page 121
• LEDs on page 122
• Hardware and Interface Alarm Messages on page 122
• Juniper Networks Technical Assistance Center on page 124
Command-Line Interface
The JUN O S In
ternet software comma nd-line interface (C LI) is the primary tool for controlling
and troubleshooting router hardware, the JUNOS Internet software, routing protocols, and
network conn ectivity. CLI commands display information from routing tables, information
specific to
routing protocols, and information about network connectivity derived from
the ping and traceroute utilities.
You enter CL
I commands on one or more external management devices connected to the
Routing Engine through ports on the craft interface. The port labeled AUX/MODEM attaches
the Routing Engine to a laptop, mod e m, or other a uxiliary device, the port labeled CONSOLE
attaches t
o a system console, and the port labeled MGMT attaches to a management LAN.
For more information, see “Routing Engine Interface Ports and Status Indicators” on page 15.
For inform
ation about using the CLI to display details about alarms generated by interfaces
and hardware components, see “Hardware and I nterface Alarm Messages” on page 122.
Troubleshoot Hardware Components
121