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Hierarchy Level


Configure options that apply to degraded chassis fabric conditions.

In Junos OS Evolved, for the fabric planes to be available for the Packet Forwarding Engines, the following conditions must be met:

  • The associated SIBs are in online state.
  • The fabric ASICs are initialized.
  • The links between the Packet Forwarding Engine ASICs and the fabric ASICs are brought up.

However, events such as link faults, fabric ASIC faults, SIB faults, and boot time Fabric OAM errors could make the fabric planes unreachable for Packet Forwarding Engines. If you have configured the degraded fabric detection along with a threshold for the number of bad planes, when the number of unreachable planes becomes equal to or more than the threshold, the software reports a degraded fabric condition.

When a Packet Forwarding Engine is affected by a degraded fabric condition, the software disables the interfaces associated with that Packet Forwarding Engine.


  • action-fpc-restart-disable—Allow the user to disable restarting of the FPCs during healing from a degraded fabric condition. The device can automatically recover from degraded fabric conditions by restarting both the fabric planes and the FPCs. If the action-fpc-restart-disable statement is configured, the healing attempt is limited to restarting the fabric planes only.

    The system will detect a null-route filtering condition and try to heal the system.


    The action-fpc-restart-disable option is not applicable to Junos OS Evolved.

  • degraded-fabric-detection-enable—Enable detection of an FPC with degraded fabric.

  • degraded-fpc-bad-plane-threshold number-of-bad-planes—Configure the number of bad planes that indicate an FPC is degraded.

    Options: number-of-bad-planes—Number of bad planes.

    Range: The range could vary depending on the platform. For example, the PTX10001-36MR supports a range from 4 to 32.

    Default: 4

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 11.4.

Statement “action-fpc-restart-disable” introduced in Junos OS Release 12.1.