Configuring Rates And Weights In The Scheduler Hierarchy; Rate Shaping And Port Shaping Overview - Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual

Chapter 7
Configuring Rates and Weights in the
Scheduler Hierarchy

Rate Shaping and Port Shaping Overview

This chapter provides information for configuring shaping rates, assured rates, and
weights in the QoS scheduler hierarchy using scheduler profiles.
QoS topics are discussed in the following sections:
Rate Shaping and Port Shaping Overview on page 51
Configuring Rate Shaping for a Scheduler Node or Queue on page 52
Configuring Port Shaping on page 53
Static and Hierarchical Assured Rate Overview on page 54
Configuring an Assured Rate for a Scheduler Node or Queue on page 55
Configuring the HRR Weight for a Scheduler Node or Queue on page 57
Rate shaping throttles the rate at which queues transmit packets. Rate shaping is
TCP friendly; that is, it buffers packets that are above the rate, rather than dropping
them.
Port shaping enables you to shape the aggregate traffic through a port or channel to
a rate that is less than the line or port rate. With port shaping, you can configure
scheduler nodes at the port level, as shown in Figure 9 on page 52.
Rate Shaping and Port Shaping Overview
51