ZyXEL 2WG Guida Utente

Chapter 21 Bandwidth Management Screens

ZyWALL 2WG User’s Guide

Here is an example of a ZyWALL that has maximize bandwidth usage enabled on an interface. 
The following table shows each bandwidth class’s bandwidth budget. The classes are set up 
based on subnets. The interface is set to 10240 kbps. Each subnet is allocated 2048 kbps. The 
unbudgeted 2048 kbps allows traffic not defined in any of the bandwidth filters to go out when 
you do not select the maximize bandwidth option.

The ZyWALL divides up the unbudgeted 2048 kbps among the classes that require more 
bandwidth. If the administration department only uses 1024 kbps of the budgeted 2048 kbps, 
the ZyWALL also divides the remaining 1024 kbps among the classes that require more 
bandwidth. Therefore, the ZyWALL divides a total of 3072 kbps of unbudgeted and unused 
bandwidth among the classes that require more bandwidth. 

The following table shows the priorities of the bandwidth classes and 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 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 ZyWALL 
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.

Table 126   Maximize Bandwidth Usage Example

Root Class: 10240 kbps

Administration: 2048 kbps

Sales: 2048 kbps

Marketing: 2048 kbps

Research: 2048 kbps

Table 127   Priority-based Allotment of Unused and Unbudgeted Bandwidth Example

Root Class: 10240 kbps

Administration: Priority 4, 1024 kbps

Sales: Priority 6, 3584 kbps

Marketing: Priority 6, 3584 kbps

Research: Priority 5, 2048 kbps