ZyXEL Communications 5 Series User Manual

ZyWALL 5/35/70 Series User’s Guide

Bandwidth management allows you to allocate an interface’s outgoing capacity to specific 
types of traffic. It can also help you make sure that the ZyWALL forwards certain types of 
traffic, such as Voice-over-IP (VoIP), with minimum delay. 

Bandwidth management addresses questions such as:

• Who gets how much access to specific applications?

• What priority level should you give to each type of traffic?

• Which traffic must have guaranteed delivery?

• How much bandwidth should be allotted to guarantee delivery?

Bandwidth management also allows you to configure the allowed output for an interface to 
match what the network can handle. This helps reduce delays and dropped packets at the next 
routing device. For example, you can set the WAN interface speed to 1024 kbps (or less) if the 
broadband device connected to the WAN port has an upstream speed of 1024 kbps. 

• Use the Summary screen (

) to enable bandwidth management on 

an interface and set the maximum allowed bandwidth for that interface. 

• Use the Class Setup screen (

) to view the configured bandwidth 

classes by individual interface and to set up a bandwidth class’s name, bandwidth 
allotment, and bandwidth filter. 

• Use  the  Monitor screen (

) to view the device’s bandwidth usage 

and allotments. 

Use bandwidth classes and sub-classes to allocate specific amounts of bandwidth capacity 
(bandwidth budgets). Configure a bandwidth filter to define a bandwidth class (or sub-class) 
based on a specific application and/or subnet.