Troubleshooting Components; Mx2020 Troubleshooting Resources; Command-Line Interface; Chapter 27 Troubleshooting Components - Juniper MX2020 Hardware Manual

CHAPTER 27

Troubleshooting Components

MX2020 Troubleshooting Resources

Command-Line Interface

Copyright © 2015, Juniper Networks, Inc.
MX2020 Troubleshooting Resources on page 531
Troubleshooting the MX2020 Cooling System on page 534
Troubleshooting the MX2020 Host Subsystems on page 536
Troubleshooting the MX2020 MICs on page 537
Troubleshooting the MX2020 MPCs on page 538
Troubleshooting the MX2020 Power Subsystem on page 541
Command-Line Interface on page 531
Chassis and Interface Alarm Messages on page 532
Alarm Relay Contacts on page 532
Craft Interface LEDs on page 532
Component LEDs on page 533
To troubleshoot an MX2020 router, you use the Junos OS command-line interface (CLI),
alarms, devices connected to the alarm relay contacts, and LEDs on both the components
and craft interface.
LEDs—When the Routing Engine detects an alarm condition, it lights the red or yellow
alarm LED on the craft interface. In addition, you can also use the component-specific
LEDs on the craft interface and on the faceplate of a component to troubleshoot the
routing matrix.
Alarm devices connected to the alarm relay contact—When a red or yellow alarm
occurs, it trips the corresponding alarm relay.
CLI—The CLI is the primary tool for controlling and troubleshooting hardware, Junos
OS, routing protocols, and network connectivity. CLI commands display information
about routing tables, information specific to routing protocols, and information about
network connectivity derived from the
You enter CLI commands on one or more external management devices connected to
ports on the Routing Engine.
and utilities.
ping traceroute
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