Vp Shaping; Figure 43: Integrated Atm Scheduler - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - QUALITY OF SERVICE CONFIGURATION GUIDE 2010-09-22 Configuration Manual

Figure 43: Integrated ATM Scheduler

VP Shaping

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Copyright © 2010, Juniper Networks, Inc.
Figure 43 on page 153 shows the HRR and SAR schedulers working together to form the
integrated scheduler. When the SAR VC queues start to back up, the SAR exerts VC
backpressure to the corresponding VC node in the HRR scheduler.
VC backpressure affects only VC nodes that are in the default traffic-class group. As a
consequence, VC nodes that are in named traffic-class groups within the scheduler
hierarchy are not affected by VC backpressure.
VP shaping can be performed either in the SAR or by using the QoS shaping application
using QoS profiles. Configuring VP shaping in the SAR enables traffic to be sent out of
the port at a rate that closely matches strict ATM contract rates. SAR VP shaping is
configured for the physical port using the atm vp-tunnel command.
Integrating the HRR Scheduler and SAR Scheduler on page 154
Per-Packet Queuing on the SAR Scheduler Overview on page 155
Chapter 19: Configuring an Integrated Scheduler to Provide QoS for ATM
153