Chassis And Interface Alarm Messages; Alarm Relay Contacts; Craft Interface Leds - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide

Chassis and Interface Alarm Messages

Alarm Relay Contacts

Craft Interface LEDs

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You enter CLI commands on one or more external management devices connected to
ports on the Routing Engine.
For information about using the CLI to troubleshoot the Junos OS, see the appropriate
Junos OS configuration guide.
JTAC—If you need assistance during troubleshooting, you can contact the Juniper
Networks Technical Assistance Center (JTAC) by using the Web or by telephone. If
you encounter software problems, or problems with hardware components not
discussed here, contact JTAC.
When the Control Board and Routing Engine (CB-RE) detects an alarm condition, it lights
the red or yellow alarm LED on the craft interface as appropriate, trips the alarm relay,
and reports the cause of the alarm in the craft interface. To view a more detailed
description of the alarm cause, issue the
There are two classes of alarm messages:
Chassis alarms indicate a problem with a chassis component such as the cooling
system or power system.
Interface alarms indicate a problem with a specific network interface.
user@host> show chassis alarms
There are two classes of alarm messages:
Chassis alarms—Indicate a problem with a chassis component such as the cooling
system or power supplies.
Interface alarms—Indicate a problem with a specific network interface.
The craft interface has two alarm relay contacts for connecting the router to external
alarm devices. Whenever a system condition triggers either the red or yellow alarm on
the craft interface, the alarm relay contacts are also activated. The alarm relay contacts
are located on the upper right of the craft interface.
The craft interface displays system status messages and allows you to troubleshoot the
MX2020 router. The craft interface is located on the upper front of the router. It contains
LEDs, buttons for the router.
LEDs on the craft interface include the following:
command:
show chassis alarms
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