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CHAPTER 32
Troubleshooting Components
Overview of Troubleshooting Resources for the M120 Router
Troubleshooting Using the Command-Line Interface
Copyright © 2018, Juniper Networks, Inc.
Overview of Troubleshooting Resources for the M120 Router on page 283
M120 LED Overview on page 284
Troubleshooting the M120 Cooling System on page 286
Troubleshooting M120 FPCs and CFPCs on page 287
Troubleshooting M120 PICs on page 288
Troubleshooting the M120 Power System on page 288
Troubleshooting M120 FEBs on page 289
Troubleshooting an M120 FEB When a Chassis Alarm Is Lit Upon Initial Startup or
Removal on page 291
Troubleshooting Using the Command-Line Interface on page 283
Troubleshooting Using the Chassis and Interface Alarm Messages on page 284
Troubleshooting Using the Juniper Networks Technical Assistance Center on page 284
The Junos OS command-line interface (CLI) is the primary tool for controlling and
troubleshooting router hardware, the Junos OS, 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
the Routing Engine to a laptop, modem, or other auxiliary device, the port labeled
attaches to a system console, and the port labeled
CONSOLE
management LAN. For more information, see
page
22.
For information about using the CLI to display details about alarms generated by interfaces
and hardware components, see
Messages" on page
284.
"M120 Routing Engine Description" on
"Troubleshooting Using the Chassis and Interface Alarm
attaches
AUX
attaches to a
ETHERNET
283
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Table of Contents
Troubleshooting
