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Explicit Constituent Selection Overview
Copyright © 2010, Juniper Networks, Inc.
Chapter 13: Configuring Implicit and Explicit Constituent Selection for Shaping
Create the scheduler profile.
1.
host1(config)#scheduler-profile implicit
Configure the shared shaper.
2.
To configure a simple shared shaper:
host1(config-scheduler-profile)#shared-shaping-rate 128000 bps
To configure a compound shared shaper:
host1(config-scheduler-profile)#shared-shaping-rate 128000 burst 32767 compound
(Optional) For compound shared shapers, specify the attributes for the constituent.
3.
host1(config-scheduler-profile)#shared-shaping-constituent weight 28
Including this command does not affect how the system selects the compound implicit
constituent. If the command is present for a constituent that was implicitly selected,
the software configures that constituent using the strict-priority or weight attributes.
After you configure implicit constituents:
Configure the scheduler hierarchy with the best-effort nodes and queues.
See "Configuring a QoS Profile" on page 126.
Constituent Selection for Shared Shaping Overview on page 103
Implicit Constituent Selection Overview on page 105
scheduler-profile
shared-shaping-constituent
shared-shaping-rate
If you want only a subset of the queues for a subscriber to be shaped to the shared rate,
then you must explicitly identify the desired constituents rather than accepting the
implicitly selected constituents.
For compound shared shaping, explicit selection is also useful when you want queues
as the active constituents instead of the node below them. By choosing queues you can
assign appropriate priority or weights.
In the set of nodes and queues for a logical interface, only scheduler objects associated
with a scheduler profile that includes a shared-shaping-constituent command are
considered constituents. Objects that are not explicitly selected are exempt from the
shared shaper.
To identify the constituents for simple shared shaping, include the explicit-constituents
keyword with the shared-shaping-rate simple command in a scheduler profile that you
associate with a best-effort node or queue to identify the logical interface.
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Troubleshooting
