Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?




Hierarchy Level


Enable or disable backward fast reroute status insertion.

Enable backward fast reroute to insert local pre-forward error correction (FEC) bit error rate (BER) status into transmitted OTN frames, notifying the remote interface. The remote interface can use the information to reroute traffic to a different interface. When you enable backward fast reroute and also enable pre-FEC BER monitoring including the signal-degrade-monitor-enable statement, notification of signal degradation and rerouting of traffic occurs in less time than that required through a Layer 3 protocol.


When you configure pre-FEC BER signal degrade monitoring, we recommend that you configure both the signal-degrade-monitor-enable and backward-frr-enable statements.

You can also configure the pre-FEC BER thresholds that raise or clear a signal degrade alarm and the time interval for the thresholds. If the BER thresholds and interval are not configured, the default values are used. Include the ber-threshold-signal-degrade value, ber-threshold-clear value, and interval value statements at the [edit interfaces interface-name otn-options signal-degrade] hierarchy level to configure the BER thresholds and time interval. See Understanding Pre-FEC BER Monitoring and BER Thresholds for more information about pre-FEC BER monitoring and determining BER threshold settings.


By default, backward fast reroute insertion is disabled.


backward-frr-enable—Enable backward fast reroute status insertion.

no-backward-frr-enable—Do not enable backward fast reroute status insertion.

Required Privilege Level

interface—To view this statement in the configuration.

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

Release Information

Statement introduced in Junos OS Release 13.2.