https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/fpc-offline-on-blackholing-edit-chassis-fabric-degraded.html
fpc-offline-on-blackholing | Junos OS | Juniper Networks
Take the FPC offline and raise an alarm if a traffic null route condition is detected in the routing matrix. By default, FPCs remain online when a null route...
junos osfpcofflineblackholingjuniper