Troubleshooting Mx2020 Router Hardware Components; Mx2020 Troubleshooting Resources; Command-Line Interface; Figure 88: Alarm Relay Contacts - Juniper MX2020 Hardware Manual

CHAPTER 12
Troubleshooting MX2020 Router
Hardware Components

MX2020 Troubleshooting Resources

Command-Line Interface

Copyright © 2013, Juniper Networks, Inc.
MX2020 Troubleshooting Resources on page 193
Troubleshooting the MX2020 Host Subsystems on page 196
Troubleshooting the MX2020 Cooling System on page 197
Troubleshooting the MX2020 MPCs on page 198
Troubleshooting the MX2020 MICs on page 201
Troubleshooting the MX2020 Power Subsystem on page 202
Command-Line Interface on page 193
Chassis and Interface Alarm Messages on page 194
Alarm Relay Contacts on page 194
Craft Interface LEDs on page 194
Component LEDs on page 195
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 and utilities.
ping traceroute
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