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    Configuring Relative Strict-Priority Scheduling for Aggregate Shaping Rates

    To configure relative strict priority scheduling for aggregate shaping rates:

    1. Create a scheduler profile for the strict-priority queue.
      host1(config)# scheduler-profile relativeStrict host1(config-scheduler-profile)# shaping-rate 500000 host1(config-scheduler-profile)# weight 0 host1(config-scheduler-profile)# exit

      Configuring the weight of 0 reduces latency and jitter.

    2. Create a scheduler profile for the nonstrict best-effort queue.
      host1(config)# scheduler-profile be host1(config-scheduler-profile)# shaping-rate 1000000 burst 1 host1(config-scheduler-profile)# weight 8 host1(config-scheduler-profile)# exit

      Tip: If you need to impose a shaping rate on the nonstrict queues to meet a functional requirement, you can specify a rate less than the aggregate rate. The key is that the burst size must be one, or small. The burst size determines the maximum-sized packet that can squeeze in front of a relative strict-priority packet in the round robin.

    3. Create a scheduler profile for the aggregate bandwidth.
      host1(config)#scheduler-profile vcAggregate host1(config-scheduler-profile)#shaping-rate 1000000 host1(config-scheduler-profile)#exit
    4. Create a QoS profile, configure node shaping for each queue, and add each of the queues to the QoS profile.
      host1(config)# qos-profile relative-strict-aggregate host1(config-qos-profile)# atm-vc node scheduler-profile vcAggregatehost1(config-qos-profile)# atm-vc queue traffic-class best-effort
      scheduler-profile be
      host1(config-qos-profile)# atm-vc queue traffic-class voice scheduler-profile relativeStrict host1(config-qos-profile)# exit host1(config)#

    This configuration creates the hierarchy shown in Figure 1.

    Figure 1: Sample Relative Strict-Priority Scheduler Hierarchy

    Sample Relative Strict-Priority Scheduler

    Published: 2014-08-11