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P-2302R Series User’s Guide

Chapter 19 Bandwidth Management 200

19.7 Scheduler

The scheduler divides up an interface’s bandwidth among the bandwidth classes. The Prestige

has two types of scheduler: fairness-based and priority-based.

19.7.1 Priority-based Scheduler

With the priority-based scheduler, the Prestige 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.

19.7.2 Fairness-based Scheduler

The Prestige 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.

19.8 Maximize Bandwidth Usage

The maximize bandwidth usage option (Figure 87 on page 204) allows the Prestige 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 Prestige first makes sure that each

bandwidth class gets up to its bandwidth allotment. Next, the Prestige 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 Prestige gives extra bandwidth to that class.

When multiple classes require more bandwidth, the Prestige 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 Prestige distributes

the available bandwidth equally among classes with the same priority level.

FTP 64 Kbps 64 Kbps

E-mail 64 Kbps 64 Kbps

Video 64 Kbps 64 Kbps

Table 76 Application and Subnet-based Bandwidth Management Example (continued)

TRAFFIC TYPE FROM SUBNET A FROM SUBNET B

1 2 ... 196 197 198 199 200 201 202 203 204 205 206 ... 383 384

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ZyXEL P-2302R Manuel d'utilisateur Page 201