Maximize Bandwidth Usage - ZyXEL Communications ZyWall 10 User Manual

ZyWALL 10~100 Series Internet Security Gateway
18.5.1 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.
18.5.2 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.

18.6 Maximize Bandwidth Usage

The maximize bandwidth usage option (see Figure 18-7) 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.
When you enable maximize bandwidth usage, the ZyWALL first makes sure that each bandwidth class gets
up to its bandwidth allotment. Next, the ZyWALL divides up an interface's available bandwidth
(bandwidth that is unbudgeted or unused by the classes) depending on how many bandwidth classes require
more bandwidth and on their priority levels. When only one class requires more bandwidth, the ZyWALL
gives extra bandwidth to that class.
When multiple classes require more bandwidth, the ZyWALL gives the highest priority classes the
available bandwidth first (as much as they require, if there is enough available bandwidth), and then to
lower priority classes if there is still bandwidth available. The ZyWALL distributes the available bandwidth
equally among classes with the same priority level.
18.6.1 Reserving Bandwidth for Non-Bandwidth Class Traffic
Do the following three steps to configure the ZyWALL to allow bandwidth for traffic that is not defined in
a bandwidth filter.
Step 1.
Leave some of the interface's bandwidth unbudgeted.
Bandwidth Management Screens 18-5