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Hierarchy Level

Release Information

Statement introduced in Junos OS Release 15.1.


Configure link degrade monitoring on an interface and specify the corrective action to be triggered when a link degrade event is detected. Deleting the configuration disables the feature. When configured, the feature monitors the quality of physical links on Ethernet interfaces (10-Gigabit, 40-Gigabit, and 100-Gigabit) and triggers the user-configured action when the link’s bit error rate (BER) value breaches the preconfigured threshold. This feature can detect a BER value as low as 10-13 to 10-5.


actions media basedAction to be taken when a link degrade event is detected. A media-based action brings down the physical link at both local and remote ends of the interface, and stops BER monitoring at the local end until an autorecovery is triggered.

The remaining statements are described separately.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.