ZyXEL Communications Internet Security Appliance ZyWALL5UTM 4.0 - Manual (Page 400)

ZyWALL 5/35/70 Series User’s Guide
Chapter 25 Bandwidth Management 400
25.6 Application and Subnet-based Bandwidth Management
You could also create bandwidth classes based on a combination of a subnet and an
application. The following example table shows bandwidth allocations for application specific
traffic from separate LAN subnets.
Table 136 Application and Subnet-based Bandwidth Management Example
TRAFFIC TYPE FROM SUBNET A FROM SUBNET B
VoIP 64 Kbps 64 Kbps
Web 64 Kbps 64 Kbps
FTP 64 Kbps 64 Kbps
E-mail 64 Kbps 64 Kbps
Video 64 Kbps 64 Kbps
25.7 Scheduler
The scheduler divides up an interface’s bandwidth among the bandwidth classes. The
ZyWALL has two types of scheduler: fairness-based and priority-based.
25.7.1 Priority-based Scheduler
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.
25.7.2 Fairness-based Scheduler
The ZyWALL divides bandwidth equally among bandwidth classes when using the fairness-
based scheduler; thus preventing one bandwidth class from using all of the interface’s
bandwidth.
25.7.3 Maximize Bandwidth Usage
The maximize bandwidth usage option (see Figure 194 on page 405 ) allows the ZyWALL to
divide up any available bandwidth on the interface (including unallocated bandwidth and any
allocated bandwidth that a class is not using) among the bandwidth classes that require more
bandwidth.