Internet Router Hardware Guide

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 d iscussed here, contact the Juniper Networks Technical
Assistance Center (JTAC) as described in “Requesting Support” on page xxiii.
Overview of Troubleshooting Resources on page 207
Troubleshooting the Cooling System on page 212
Troubleshooting Packet Forwarding Engine Components on page 213
Troubleshooting the Power System on page 215
Overview of Troubleshooting Resources
This section provides an overview of the resources you can use while
troubleshooting problems with the router:
Command-Line Interface on page 207
LEDs on page 208
Chassis and Interface Alarm Messages on page 209
BlownFuseIndicatorsonpage211
Juniper Networks Technical Assistance Center on page 212
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 s pecific 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 Connector Interface
Panel (CIP). The p o rt labeled
AUXILIARY attachestheRoutingEnginetoalaptop,
modem, or other auxiliary device, the port labeled
CONSOLE attaches to a system
Over view of Troubleshooting Resources 207