Comparison Of True Strict Priority With Relative Strict Priority Scheduling; Schedulers And True Strict Priority - Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual

rate. The port will not become congested, and the latency caused by the round-robin
behavior of both the HRR and cell schedulers is nominal. In these undersubscribed
conditions, the latency of a strict-priority queue within each VC is calculated as if the
VC were draining onto a wire with bandwidth equal to the shaped rate.
Relative strict priority is carried out in the HRR scheduler on E Series ASIC line
modules.
Related Topics

Comparison of True Strict Priority with Relative Strict Priority Scheduling

This section explains how the HRR and SAR schedulers handle true strict-priority
and relative strict-priority configurations.

Schedulers and True Strict Priority

In the strict-priority configuration in Figure 12 on page 62, the queues stacked above
the single strict priority scheduler node make up a round-robin separate from the
nonstrict queues. All strict queues are drained to completion first, and any residual
bandwidth is allocated to the nonstrict round-robin.
Comparison of True Strict Priority with Relative Strict Priority Scheduling on
page 61
Configuring Strict-Priority Scheduling on page 66
Configuring Relative Strict-Priority Scheduling for Aggregate Shaping Rates on
page 68
Comparison of True Strict Priority with Relative Strict Priority Scheduling
Chapter 8: Configuring Strict-Priority Scheduling
61