Fairness-Based Scheduler; Maximize Bandwidth Usage; Reserving Bandwidth For Non-Bandwidth Class Traffic - ZyXEL Communications P-660H-D Series User Manual

P-660R/H-D Series User's Guide

16.7.2 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.

16.7.3 Maximize Bandwidth Usage

The maximize bandwidth usage option (see
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.

16.7.4 Reserving Bandwidth for Non-Bandwidth Class Traffic

Do the following three steps to configure the Prestige to allow bandwidth for traffic that is not
defined in a bandwidth filter.
1 Leave some of the interface's bandwidth unbudgeted.
2 Do not enable the interface's Maximize Bandwidth Usage option.
3 Do not enable bandwidth borrowing on the child-classes that have the root class as their
parent (see
163
Section 16.8 on page 165).
Chapter 16 Media Bandwidth Management Advanced Setup
Figure 80 on page 167) allows the Prestige to