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CHAPTER 13
Troubleshooting M120 Hardware
Components
•
Overview of Troubleshooting Resources for the M120 Router on page 117
•
M120 LED Overview on page 118
•
Troubleshooting the M120 Cooling System on page 120
•
Troubleshooting M120 FPCs and CFPCs on page 121
•
Troubleshooting M120 PICs on page 122
•
Troubleshooting M120 FEBs on page 122
•
Troubleshooting an M120 FEB When a Chassis Alarm Is Lit Upon Initial Startup or
Removal on page 124
•
Troubleshooting the M120 Power System on page 124
Overview of Troubleshooting Resources for the M120 Router
•
Troubleshooting Using the Command-Line Interface on page 117
•
Troubleshooting Using the Chassis and Interface Alarm Messages on page 118
•
Troubleshooting Using the Juniper Networks Technical Assistance Center on page 118
Troubleshooting Using the Command-Line Interface
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
AUX
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
ETHERNET
attaches to a
management LAN. For more information, see “M120 Routing Engine Description” on
page 18.
117
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