Juniper Networks M5 Troubleshoot Hardware Components, Overview of Troubleshooting Resources, 121

Chapter 11

Troubleshoot 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 “How to Request Support” on page xix.

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Overview of Troubleshooting Resources on page 121

Troubleshoot the Fan Tray on page 124

Troubleshoot Packet Forwarding Engine Components on page 124

Troubleshoot the Power System on page 125

Overview of Troubleshooting Resources

This section provides an overview of the resources you can use while troubleshooting problems with the router:

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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 JUNOS Internet software command-line interface (CLI) is the primary tool for controlling and troubleshooting router hardware, the JUNOS Internet 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.

You enter CLI 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, modem, or other auxiliary device, the port labeled CONSOLE attaches to 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 information about using the CLI to display details about alarms generated by interfaces and hardware components, see “Hardware and Interface Alarm Messages” on page 122.

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