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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 vcAggregate
   host1(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 16.

Figure 16: Sample Relative Strict-Priority Scheduler Hierarchy

#### Related Topics

- Strict-Priority and Relative Strict-Priority Scheduling Overview
- For more information about specifying an expression that you can reference within a scheduler profile, see Using Expressions for Bandwidth and Burst Values in a Scheduler Profile
- node command
- qos-profile command
- scheduler-profile command
- shaping-rate command
- weight command

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