ZyXEL Communications 5 Series User Manual

 Chapter 25 Bandwidth Management Screens

ZyWALL 5/35/70 Series User’s Guide

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 ZyWALL 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. 

Do the following three steps to configure the ZyWALL to allow bandwidth for traffic that is 
not defined in a bandwidth filter.

1 Leave some of the interface’s bandwidth unbudgeted.
2 Do not enable the interface’s Maximize Bandwidth Usage option.
3 Do not enable bandwidth borrowing on the sub-classes that have the root class as their 

parent (see 

).

The Class Setup screen displays the configured bandwidth classes by individual interface. 
Select an interface and click the buttons to perform the actions described next. Click “+” to 
expand the class tree or click “-” to collapse the class tree. Each interface has a permanent root 
class. The bandwidth budget of the root class is equal to the speed you configured on the 
interface (see 

 to configure the speed of the interface). Configure sub-

class layers for the root class. 

To add or delete child classes on an interface, click ADVANCED > BW MGMT > Class 
Setup. The screen is shown here with example classes.

Table 144   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