ZyXEL 2WG Guía Del Usuario

Chapter 21 Bandwidth Management Screens

ZyWALL 2WG User’s Guide

You can configure up to one bandwidth filter per bandwidth class. You can also configure 
bandwidth classes without bandwidth filters. However, it is recommended that you configure 
sub-classes with filters for any classes that you configure without filters. The ZyWALL leaves 
the bandwidth budget allocated and unused for a class that does not have a filter or sub-classes 
with filters.
The total of the configured bandwidth budgets for sub-classes cannot exceed the configured 
bandwidth budget speed of the parent class. 

Bandwidth management allows you to define how much bandwidth each class gets; however, 
the actual bandwidth allotted to each class decreases or increases in proportion to actual 
available bandwidth. 

You can create bandwidth classes based on individual applications (like VoIP, Web, FTP, E-
mail and Video for example).

You can create bandwidth classes based on subnets.
The following figure shows LAN subnets. You could configure one bandwidth class for subnet 
A and another for subnet B. 

Figure 255   Subnet-based Bandwidth Management Example

The scheduler divides up an interface’s bandwidth among the bandwidth classes. The 
ZyWALL has two types of scheduler: fairness-based and priority-based.

With the priority-based scheduler, the ZyWALL forwards traffic from bandwidth classes 
according to the priorities that you assign to the bandwidth classes. The larger a bandwidth 
class’s priority number is, the higher the priority. Assign real-time applications (like those 
using audio or video) a higher priority number to provide smoother operation.