CHAPTER 26
Troubleshooting Components
•
Troubleshooting Resources for MX104 Routers on page 197
•
Understanding Alarm Types and Severity Classes on MX104 Routers on page 198
•
Verifying Active Alarms on MX104 Routers on page 199
•
Monitoring System Log Messages on MX104 Routers on page 200
Troubleshooting Resources for MX104 Routers
•
Command-Line Interface on page 197
•
Front Panel LEDs on page 197
•
Alarm Devices and Messages on page 198
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
ports on the front panel.
For information about using the CLI to troubleshoot the Junos OS, see the appropriate
Junos OS configuration guide.
Front Panel LEDs
The front panel on the router contains LEDs that allow you to troubleshoot the router.
LEDs on the front panel include the following:
•
System LED—One LED labeled SYS OK on the front panel indicates the status of the
router.
•
Alarm LEDs—One yellow and one red LED on the front panel indicate major and minor
alarms.
197Copyright © 2017, Juniper Networks, Inc.
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