When you have a Juniper switch with factory settings you will have an always-on red alarm LED (labeled "ALM"). This is because the switch does not have link on the management port (MGMT) and there is no rescue configuration saved. You can see the active alerts by executing
show system alarms
in the CLI.
The output may look like this:
2 alarms currently active Alarm time Class Description 2014-12-10 17:18:17 CET Major Management Ethernet Link Down 2014-12-10 17:17:31 CET Minor Rescue configuration is not set
To resolve the no rescue config alarm you need to save a rescue config by executing
request system configuration rescue save
To resolve the management link down alarm either plug in the management port or if you don't want to use it tell the system to ignore the alarm by executing
configure set chassis alarm management-ethernet link-down ignore commit and-quit
Now the alarm LED should turn off and
show system alarms should output
No alarms currently active
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