ZyXEL P-2302R Manuel d'utilisateur télécharger pdf (Page 203)

P-2302R Series User’s Guide

Chapter 19 Bandwidth Management 202

• Each class gets up to its budgeted bandwidth. The administration class only uses 1024

kbps of its budgeted 2048 kbps.

• The sales and marketing are first to get extra bandwidth because they have the highest

priority (6). If they each require 1536 kbps or more of extra bandwidth, the Prestige

divides the total 3072 kbps total of unbudgeted and unused bandwidth equally between

the sales and marketing departments (1536 kbps extra to each for a total of 3584 kbps for

each) because they both have the highest priority level.

• Research requires more bandwidth but only gets its budgeted 2048 kbps because all of the

unbudgeted and unused bandwidth goes to the higher priority sales and marketing

classes.

19.8.2.2 Fairness-based Allotment of Unused and Unbudgeted Bandwidth

The following table shows the amount of bandwidth that each class gets.

Suppose that all of the classes except for the administration class need more bandwidth.

• Each class gets up to its budgeted bandwidth. The administration class only uses 1024

kbps of its budgeted 2048 kbps.

• The Prestige divides the total 3072 kbps total of unbudgeted and unused bandwidth

equally among the other classes. 1024 kbps extra goes to each so the other classes each

get a total of 3072 kbps

19.9 Bandwidth Borrowing

Bandwidth borrowing allows a sub-class to borrow unused bandwidth from its parent class,

whereas maximize bandwidth usage allows any bandwidth class to borrow any unused or

unbudgeted bandwidth on the whole interface.

Enable bandwidth borrowing on a sub-class to allow the sub-class to use the parent class’s

unused bandwidth. The parent class’s unused bandwidth is given to the highest priority sub-

class first (see Section 19.9.1 on page 203).

The total of the bandwidth allotments for sub-classes cannot exceed the bandwidth allotment

of the parent class. The Prestige uses the scheduler to divide the parent class’s unused

bandwidth among the sub-classes that have bandwidth borrowing enabled.

Table 79 Fairness-based Allotment of Unused and Unbudgeted Bandwidth Example

BANDWIDTH CLASSES AND ALLOTMENTS

Root Class: 10240 kbps Administration: 1024 kbps

Sales: 3072 kbps

Marketing: 3072 kbps

Research: 3072 kbps

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ZyXEL P-2302R Manuel d'utilisateur Page 203