ZyXEL P-660HW-T1 v2 User Guide - Page 181
Fairness-based Scheduler, Reserving Bandwidth for Non-Bandwidth Class Traffic
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P-660HW-T v2 User's Guide 13.5.2 Fairness-based Scheduler The ZyXEL Device 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. 13.6 Maximize Bandwidth Usage The maximize bandwidth usage option (see Figure 102 on page 184) allows the ZyXEL Device 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 ZyXEL Device first makes sure that each bandwidth class gets up to its bandwidth allotment. Next, the ZyXEL Device 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 ZyXEL Device gives extra bandwidth to that class. When multiple classes require more bandwidth, the ZyXEL Device 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 ZyXEL Device distributes the available bandwidth equally among classes with the same priority level. 13.6.1 Reserving Bandwidth for Non-Bandwidth Class Traffic Do the following three steps to configure the ZyXEL Device 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 Section 13.9 on page 185). Chapter 13 Bandwidth Management 181