VSC7440 datasheet(243/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

226

Figure 67 •

Default Scheduling Hierarchy

3.24.7.3 Bandwidth Control

Each scheduler element has a dual leaky bucket shaper on its output, which may block further

transmissions from that scheduler element. It is controlled through a leaky bucket system, filling the

bucket when data is transmitted, and leaking it at the configured rate. The bucket is closed when more

data than the configured burst capacity has been filled into it.

The shaper has three rate modes that define what is added to a bucket:

•

Bits transmitted excluding IFG

•

Bits transmitted including IFG

•

Frames transmitted

Each of the three layers have four linked lists configured. All scheduling elements with active shapers

must be members of one of those. Each linked list is processed once every configurable interval. When a

list is processed, all shapers in it will leak its configured rate setting.

Examples:

layer 0

#112

#114

#116

#118

15 queues, src

dst 7, iprio 3

#120

#122

#124

#126

layer 1

SE #7

layer 2

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