VSC7511 datasheet(27/324 Pages) MICROSEMI

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Product Overview

VMDS-10488 VSC7511 Datasheet Revision 4.2

Figure 4 •

Default Egress Scheduler and Shaper Configuration

Scheduling between QoS classes within the port can use one of three methods:

•

Strict. Frames with the highest QoS class are always transmitted before frames with lower QoS

class. This is shown in Figure 4, page 12.

•

Combination of strict and Deficit Weighted Round Robin (DWRR) scheduling. Any split of strict and

DWRR QoS classes can be configured. Figure 3, page 10 shows an example where QoS classes 6

and 7 are strict while QoS classes 0 through 5 are weighted. Each QoS class sets a DWRR weight

ranging from 0 to 31.

•

Combination of strict and Frame Based Round Robin (FBRR) scheduling. Any split between strict

and FBRR QoS classes can be configured.

All shapers shown in the following illustrations are single leaky bucket shapers.

SE #146

High

Low

SE #0

SE #7

Input port #0

Input port #1

Input port #2

Input port #3

Input port #4

Input port #5

Input port #6

Input port #7

Input port #8

Input port #9

Input port #10

ICPU (#11)

Input port #0

Input port #1

Input port #2

Input port #3

Input port #4

Input port #5

Input port #6

Input port #7

Input port #8

Input port #9

Input port #10

ICPU (#11)

Q-0

Q-11

Q-84

Q-95

Output Port

Shaper

QoS Class #7

Shaper

Virtual Input Queues

QoS Class 0

Virtual Input Queues

QoS Class 7

QoS Class #0

Shaper

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