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Configuring Explicit Constituents for Simple or Compound Shared Shaping
Copyright © 2010, Juniper Networks, Inc.
Chapter 13: Configuring Implicit and Explicit Constituent Selection for Shaping
You can specify explicit constituents and set the attributes of both implicit and explicit
shared-shaping constituents that determine how bandwidth is allocated to them.
There are two types of explicit constituents:
Simple explicit constituents—The software selects constituents based on the
shared-shaping-constituent command. The weight and priority attributes of the
shared-shaping-constituent command are ignored, because the simple shared shaper
does not allocate bandwidth among constituents; instead it controls just the best-effort
queue or node.
Compound explicit—The software selects constituents based on the configured shared
priority and shared weight in the shared-shaping-constituent command. If no attributes
are specified, the software supplies a shared priority consistent with the legacy
scheduler configuration. You can specify a constituent as strict (priority) or weighted.
Strict-priority constituents are allocated bandwidth ahead of weighted constituents.
Before you configure explicit constituents:
Configure the traffic classes and traffic-class groups.
See "Configuring Traffic Classes That Define Service Levels" on page 14 and "Configuring
Traffic-Class Groups That Define Service Levels" on page 15.
To configure explicit constituents:
Create the scheduler profile.
1.
host1(config)#scheduler-profile explicit
Configure the shared-shaper and specify that you do not want the router to identify
2.
shared shaper constituents associated with the logical interface.
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
explicit-constituents
Specify the attributes for the explicit constituent.
3.
host1(config-scheduler-profile)#shared-shaping-constituent weight 28
You can specify a constituent as strict (priority) or weighted. Strict-priority constituents
are allocated bandwidth ahead of weighted constituents.
You can optionally set a value that determines the precedence of a constituent among
its peers (strict or weighted) for claiming bandwidth.
For strict-priority constituents, the priority range is 1–8 and the default value is 8. A
lower value correlates to a higher claim.
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