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Hierarchy Level

Release Information

Statement introduced in Junos OS Release 13.2 for PTX Series routers.


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.