Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - QUALITY OF SERVICE CONFIGURATION GUIDE 2010-09-22 Configuration Manual page 79

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When calculating constant shaping rates, use the following formula to translate burst
values from bytes to milliseconds (ms):
Using this formula, a 2 Mbps service with a 500 KB burst yields:
The shaping rate is calculated when the QoS profile is attached based on the parameter
instance. For example:
host1(config)# scheduler-profile sp-1mbs
(config-scheduler-profile)# shaping-rate video-bandwidth % 100 burst 500 milliseconds
When the shaping rate for video-bandwidth is 2 Mbps, the burst value is calculated using
the following formula:
The burst value in bits is calculated as:
The burst value in bytes is calculated as:
For more information about using expressions within scheduler profiles that are used
for QoS parameters, see Scheduler Profiles and Parameter Expressions for QoS
Administrators on page 221
Configuring Rate Shaping for a Scheduler Node or Queue on page 52
Configuring Port Shaping on page 52
Chapter 6: QoS Scheduler Hierarchy Overview
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