Weighted Compound Shared Shaping Example; Figure 31: Weighted Shared Shaping - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - QUALITY OF SERVICE CONFIGURATION GUIDE 2010-09-22 Configuration Manual

Figure 31: Weighted Shared Shaping

Copyright © 2010, Juniper Networks, Inc.
Chapter 13: Configuring Implicit and Explicit Constituent Selection for Shaping
in proportion to their shared-shaping-weight. A higher weight value grants the constituent
a greater proportion of the available bandwidth.
Although a shared shaper can be applied to up to eight constituents, only four of these
can be weighted constituents. If you configure more than four weighted constituents as
part of the same shared shaper, the first four are treated as weighted constituents but
the remainder are handled as strict constituents, generating a warning message.

Weighted Compound Shared Shaping Example

Weighted shared shaping is most useful for sharing bandwidth between traffic classes
carrying TCP data. Figure 31 on page 109 shows an application of weighted shared shaping
where weighted constituents span multiple traffic class groups, making them ineligible
for legacy weighted scheduling. Best-effort data and premium data constituents are
weighted.
Scheduler profile A specifies the shared-shaping rate of 1Mbps for the best-effort node,
which is associated with a VC logical interface. The node is further configured with a
weight of 1. Scheduler profile B specifies the VC 1 AF node as a weighted constituent with
a weight of 31.
The implicitly selected constituents of the shared shaper are the VC 1 best-effort node,
the VC 1 AF group node, and the VC 1 EF group node. Bandwidth is allocated as follows:
The VC 1 EF group node is strict and can transmit up to the shared-shaping rate of
1Mbps. Any remaining bandwidth is available to the remaining constituents.
The VC 1 AF group node is weighted with the VC 1 best-effort node. The sum of the
constituent weights is 32. With a weight of 31, the VC 1 AF group node can transmit
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