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Hierarchy Level


Configure up to 16 forwarding classes with multiple forwarding classes mapped to single queues. If you want to configure up to eight forwarding classes with one-to-one mapping to output queues, use the queue statement instead of the class statement at the [edit class-of-service forwarding-classes] hierarchy level.

On EX8200 switches, you can assign a fabric priority to a forwarding class. The fabric priority determines scheduling priority of packets ingressing the switch fabric. In addition, for interfaces on the 40-port SFP+ line card, the fabric priority determines whether packets are sent to the high or low priority queue for ingressing the port group. The primary use of this option is to prevent high priority input traffic from being dropped due to congestion on the port group of a 40-port SFP+ line card.



Name of forwarding class.

priority (high | low)

(Optional) (EX8200 switches only) Fabric priority.

  • Default: low

queue-num queue-number

Output queue number.

  • Range: 0 through 7

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 9.0.