ZyXEL Communications P-2302R Series User Manual

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. 

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

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 

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

Root Class: 10240 kbps

Administration: 1024 kbps

Sales: 3072 kbps

Marketing: 3072 kbps

Research: 3072 kbps