Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Configuration Manual

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Chapter 11
Configuring Variables in the Simple
Shared Shaping Algorithm
This chapter provides information for configuring variables within the simple shared
shaper algorithm on the E Series router.
QoS topics are discussed in the following sections:
■
Simple Shared Shaping Algorithm Overview on page 89
■
Variables of the Simple Shared Shaper Algorithm on page 91
■
Guidelines for Controlling the Simple Shared Shaper Algorithm on page 93
■
Configuring Simple Shared Shaper Algorithm Variables on page 93
■
Sample Process for Controlling the Simple Shared Shaper Algorithm on page 95
Simple Shared Shaping Algorithm Overview
You can configure variables within the simple shared shaper algorithm to control the
minimum dynamic rate for all simple shared shapers on the router.
Configuring variables in the simple shared shaper algorithm is useful for IPTV
configurations. Without limiting the dynamic rate, best-effort data traffic can be
starved for a few seconds when a video stream starts. The minimum dynamic rate
defined by shared shaper algorithm variables applies to best-effort traffic only.
Figure 22 on page 89 shows a two-constituent simple shared shaper consisting of
best-effort and video traffic. The sum of the best-effort and video traffic is shaped to
the configured shared-shaping rate.
Figure 22: Simple Shared Shaper Behavior Without Algorithm Controls
Simple Shared Shaping Algorithm Overview
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