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Hierarchical Schedulers and Traffic Control Profiles

When used, the interface set level of the hierarchy falls between the physical interface level (Level 1) and the logical interface (Level 3). Queues are always Level 4 of the hierarchy.

Note:

Beginning with Junos OS Release 16.1, certain MPCs on MX Series devices support up to five levels of scheduler hierarchies. The concepts presented in this topic apply similarly to five scheduler hierarchy levels.

Hierarchical schedulers add CoS parameters to the interface-set level of the configuration. They use traffic control profiles to set values for parameters such as shaping rate (the peak information rate [PIR]), guaranteed rate (the committed information rate [CIR] on these interfaces), scheduler maps (assigning queues and resources to traffic), and so on.

The following CoS configuration places the following parameters in traffic control profiles at various levels:

  • Traffic control profile at the port level (tcp-port-level1):

    • A shaping rate (PIR) of 100 Mbps

    • A delay buffer rate of 100 Mbps

  • Traffic control profile at the interface set level (tcp-interface-level2):

    • A shaping rate (PIR) of 60 Mbps

    • A guaranteed rate (CIR) of 40 Mbps

  • Traffic control profile at the logical interface level (tcp-unit-level3):

    • A shaping rate (PIR) of 50 Mbps

    • A guaranteed rate (CIR) of 30 Mbps

    • A scheduler map called smap1 to hold various queue properties (level 4)

    • A delay buffer rate of 40 Mbps

In this case, the traffic control profiles look like this:

Once configured, the traffic control profiles must be applied to the proper places in the CoS interfaces hierarchy.

In all cases, the properties for level 4 of the hierarchical schedulers are determined by the scheduler map.

Change History Table

Feature support is determined by the platform and release you are using. Use Feature Explorer to determine if a feature is supported on your platform.

Release
Description
16.1
Beginning with Junos OS Release 16.1, certain MPCs on MX Series devices support up to five levels of scheduler hierarchies.