For more information about component and front panel LEDs, see “MX104 LEDs Overview”
on page 11.
Alarm Devices and Messages
When a major or minor alarm occurs, it logs the cause of the alarm. If the alarm relay
contact is connected to alarm devices, the router also trips the corresponding alarm relay
contact.
To view a detailed description of the alarm cause, issue the show chassis alarms command:
user@host> show chassis alarms
Related
Documentation
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
Understanding Alarm Types and Severity Classes on MX104 Routers
Before monitoring alarms on the router, become familiar with the terms defined in
Table 75 on page 198.
Table 75: Alarm Terms
DefinitionTerm
Signal alerting you to conditions that might prevent normal operation. On
a router, the alarm signal is the red system LED lit on the front of the
chassis.
alarm
Failure event that triggers an alarm.alarm condition
Seriousness of the alarm. The level of severity can be either major (steady
red) or minor (blinking red).
alarm severity
Predefined alarm triggered by a physical condition on the router or one of
the router components. Alarms may be triggered by events such as a power
failure, excessive component temperature, or media failure. Chassis alarms
are preset and cannot be modified.
chassis alarm
Predefined alarm triggered by a missing rescue configuration or failure to
install a license for a licensed software feature. System alarms are preset
and cannot be modified, although you can configure them to appear
automatically in the J-Web interface display or CLI display.
system alarm
Predefined alarm triggered by a problem with a specific network interface.interface alarm
Copyright © 2017, Juniper Networks, Inc.198
MX104 3D Universal Edge Router Hardware Guide
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