ZyXEL P-662HW-63 User Guide - Page 279
Fairness-based Scheduler, Reserving Bandwidth for Non-Bandwidth Class Traffic, Maximize Bandwidth
View all ZyXEL P-662HW-63 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 279 highlights
Chapter 19 Bandwidth Management 19.5.2 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. 19.6 Maximize Bandwidth Usage The maximize bandwidth usage option (see Figure 159 on page 281) 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. 19.6.1 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 19.8 on page 282). 19.6.2 Maximize Bandwidth Usage Example Here is an example of a ZyXEL Device that has maximize bandwidth usage enabled on an interface. The following table shows each bandwidth class's bandwidth budget. The classes are set up based on subnets. The interface is set to 10240 kbps. Each subnet is allocated 2048 kbps. The unbudgeted 2048 kbps allows traffic not defined in any of the bandwidth filters to go out when you do not select the maximize bandwidth option. Table 115 Maximize Bandwidth Usage Example BANDWIDTH CLASSES AND ALLOTMENTS Root Class: 10240 kbps Administration: 2048 kbps Sales: 2048 kbps Marketing: 2048 kbps Research: 2048 kbps P-662H/HW-D Series User's Guide 279