Figure 29: Implicit Constituent Selection For Compound Shared Shaper At Best-Effort Node; Best-Effort Node - Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual

JUNOSe 11.1.x Quality of Service Configuration Guide
3.
In Figure 29 on page 110, scheduler profile A includes a shared-shaping rule, and is
associated with the best-effort node for VC 2. The constituents are all the scheduler
objects associated with VC 2: VC 2 nodes and VC 2 queues. Nodes are selected over
queues, so the implicitly selected active constituents are the VC 2 default group node,
the VC 2 Group EF node, and the VC 2 Group AF node.

Figure 29: Implicit Constituent Selection for Compound Shared Shaper at Best-Effort Node

In Figure 30 on page 111, scheduler profile B is associated with the best-effort queue
for VC 3. This association indicates that the logical interface type being shared is VC.
The constituents are all the scheduler objects associated with VC 3: VC 3 nodes and
VC 3 queues. Nodes are selected over queues, so the implicitly selected active
constituents for profile B's shared shaper are the VC 3 default group queue, the VC
3 Group EF node, and the VC 3 Group AF node. The VC 3 default group queue is
selected instead of the VC 3 default group node because the shared shaper is
associated with that best-effort queue.
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Implicit Constituent Selection Overview
Nodes are selected over queues.
For example, suppose a shared shaper is associated with a particular interface
type. A node for that interface type is present and has a queue for that interface
type stacked above it. The node is selected and becomes an active constituent;
the queue is not selected.
Now suppose a shared shaper is associated with a logical interface at the
best-effort node, and a second shared shaper is simultaneously associated with
the same interface at the best-effort queue. In this case, the node is selected as
the constituent, because nodes are selected over queues.