Juniper Networks :: Technical Documentation :: Understanding Alarm Types and Severity Levels on EX-series Switches

Understanding Alarm Types and Severity Levels on EX-series Switches

Before monitoring alarms on the switch, become familiar with the terms defined in Table 1.

Table 1: Alarm Terms

Term	Definition
alarm	Signal alerting you to conditions that might prevent normal operation. On a switch, the alarm signal is the yellow ALARM LED lit on the front of the chassis.
alarm condition	Failure event that triggers an alarm.
alarm severity	Seriousness of the alarm. The level of severity can be either major (red) or minor (yellow).
chassis alarm	Predefined alarm triggered by a physical condition on the switch such as a power supply failure, excessive component temperature, or media failure.
system alarm	Predefined alarm triggered by a missing rescue configuration or failure to install a license for a licensed software feature.

Alarm Types

The switch supports these alarms:

Chassis alarms indicate a failure on the switch or one of its components. Chassis alarms are preset and cannot be modified.
System alarms indicate a missing rescue configuration. 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.

Alarm Severity Levels

Alarms on a Ex-series switch have two severity levels:

Major (red)—Indicates a critical situation on the switch that has resulted from one of the following conditions. A red alarm condition requires immediate action.
- One or more hardware components have failed.
- One or more hardware components have exceeded temperature thresholds.
- An alarm condition configured on an interface has triggered a critical warning.
Minor (yellow)—Indicates a noncritical condition on the switch that, if left unchecked, might cause an interruption in service or degradation in performance. A yellow alarm condition requires monitoring or maintenance.
A missing rescue configuration generates a yellow system alarm.