Virtual schedulers are created within the context of a hierarchical scheduler policy. A hierarchical scheduler policy defines the hierarchy and parameters for each scheduler. A scheduler is defined in the context of a tier (Tier 1, Tier 2, Tier 3). The tier level determines the scheduler’s position within the hierarchy. Three tiers of virtual schedulers are supported (see Figure: Hierarchical scheduler and queue association).
Tier 1 schedulers (also called root schedulers) can also have a parent scheduler. A scheduler can enforce a maximum rate of operation for all child policers, queues, and associated schedulers.
Figure: Hierarchical scheduler and queue association
