CHAPTER 31
Troubleshooting Components
IN THIS CHAPTER
MX2020 Troubleshooting Resources | 675
Troubleshooting the MX2020 Cooling System | 678
Troubleshooting the MX2020 Host Subsystems | 681
Troubleshooting the MX2020 MICs | 681
Troubleshooting a Modular Port Concentrator (MPC) | 683
Troubleshooting the MX2000 Router Power System | 686
MX2020 Troubleshooting Resources
IN THIS SECTION
Command-Line Interface | 675
Chassis and Interface Alarm Messages | 676
Alarm Relay Contacts | 676
Craft Interface LEDs | 677
Component LEDs | 677
Command-Line Interface
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.
675
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