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Hierarchy Level


For IQ and IQ2 interfaces, as well as on the 10x10GE MIC with SFP+, assign a custom scheduler to the packet forwarding component queues that control the aggregated traffic transmitted into the entire PIC.


On Intelligent Queuing (IQ) and Intelligent Queuing 2 (IQ2) interfaces, as well as on the 10x10GE MIC with SFP+, the traffic that is fed from the packet forwarding components into the PIC uses low packet loss priority (PLP) by default and is distributed evenly across the four chassis queues (not PIC queues), regardless of the scheduling configuration for each logical interface. This default behavior can cause traffic congestion.


derived—Sets the chassis queues to derive their scheduling configuration from the associated logical interface scheduling configuration.

map-name—Name of the scheduler map configured at the [edit class-of-service scheduler-maps] hierarchy level.

Best Practice:

It is always preferred that you apply a custom scheduler map instead of using the derived option. We strongly recommend that you do not use the derived option if the PIC is oversubscribed.

Required Privilege Level

interface—To view this statement in the configuration.

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

Release Information

Statement introduced before Junos OS Release 7.4.