Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Configuration Manual

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host1config)#ERROR 02/08/2005 14:06:36 qos: line card in slot 11: EFA2 hardware
not installed. 1 compound shared shaper(s) converted to simple.
QoS automatically converts the compound shared shaper to a simple shared shaper.
NOTE: Compound shared shaping is not supported by the frame forwarding ASIC
(FFA).
Bandwidth Allocation for Compound Shared Shaping
The compound shared-shaper mechanism actively allocates the bandwidth it receives
from the hierarchical scheduler to each active constituent, based on its own rules,
independent of the hierarchical scheduler. Constituents are either
priority constituents
or weighted constituents. These attributes are specified using the
shared-shaper-constituent command.
Compound shared-shaper scheduling allocates bandwidth as follows:
1.
Priority constituents consume as much of the shared bandwidth as they can,
subject to the bandwidth allocated to them by the hierarchical scheduler.
2.
Priority constituents are ordered according to their priority.
3.
The weighted constituents subdivide the remaining shared bandwidth in
proportion to their shared weights, again subject to the bandwidth allocated to
them by the hierarchical scheduler.
Related Topics
For a list of shared shaper terms, see Shared Shaping Overview on page 71
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Configuring Compound Shared Shaping on page 100
Configuring Compound Shared Shaping
Compound shared shaping requires that you set a shared-shaping rate in a scheduler
profile associated with a best-effort node or queue.
Before you configure compound shared shaping:
■
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 compound shared shaping:
1.
Create the scheduler profile.
host1(config)# scheduler-profile compound
2.
Configure the compound shared shaper.
100 ■
Configuring Compound Shared Shaping
JUNOSe 11.1.x Quality of Service Configuration Guide