ZyXEL p-662h-61 Guia Do Utilizador

Prestige 662HW Series User’s Guide

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Chapter 23 Media Bandwidth Management Advanced Setup

Figure 129   Maximize Bandwidth Usage Example

Bandwidth borrowing allows a child-class to borrow unused bandwidth from its parent class, 
whereas maximize bandwidth usage allows bandwidth classes to borrow any unused or 
unbudgeted bandwidth on the whole interface.

Enable bandwidth borrowing on a child-class to allow the child-class to use its parent class’s 
unused bandwidth. A parent class’s unused bandwidth is given to the highest priority child-
class first. The child-class can also borrow bandwidth from a higher parent class (grandparent 
class) if the child-class’s parent class is also configured to borrow bandwidth from its parent 
class. This can go on for as many levels as are configured to borrow bandwidth from their 
parent class (see

The total of the bandwidth allotments for child-classes cannot exceed the bandwidth allotment 
of their parent class. The Prestige uses the scheduler to divide a parent class’s unused 
bandwidth among the child-classes. 

Here is an example of bandwidth management with classes configured for bandwidth 
borrowing. The classes are set up based on departments and individuals within certain 
departments.