Configuring Scheduling

When congestion occurs on a network, queue scheduling solves the resource preemption problem among multiple packets.

Context

  • Congestion management technology prevents intermittent congestion on networks by using queue scheduling technologies.
  • Queue scheduling technologies include PQ scheduling, DRR scheduling and WRR scheduling.

Procedure

  1. Choose QoS > Congestion Management > Configure Scheduling in the navigation tree to open the Configure Scheduling page.

    Table 1 describes the parameters on the Configure Scheduling page.

    Table 1 Configure Scheduling

    Parameter

    Description

    Select Interface

    Indicates the interface where scheduling needs to be configured. You can select multiple interfaces.

    Queues

    Indicates the queue where scheduling needs to be configured.

    Scheduling Mode
    Indicates the queue scheduling mode, including:
    • PQ

      In PQ mode, the switch schedules packets based on priorities of queues in a strict manner. The weight is not used in this mode.

    • DRR

      In RR mode, the switch schedules packets circularly based on priorities of queues. Based on RR scheduling, DRR scheduling is used to schedule packet flows of all the queues according to the maximum bandwidth assigned by the switch to the queues.

    • WRR

      Based on DRR scheduling, WRR scheduling is used to schedule packet flows based on weights of queues.

    The default value is PQ.
    NOTE:
    WRR and DRR cannot be specified simultaneously.

    Weight

    Indicates the weight used to schedule packet flows in queues. When the scheduling mode is set to WRR or DRR, the weight can be configured.

  2. Select the interfaces that you want to configure.
  3. Set the scheduling mode and weight for the queue.
  4. Click Apply.
Parent topic: Congestion Management
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