ZyXEL ZyWALL 5 User Guide - Page 470
Maximize Bandwidth Usage Example
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Chapter 25 Bandwidth Management Screens 25.2.1 Maximize Bandwidth Usage Example Here is an example of a ZyWALL 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 142 Maximize Bandwidth Usage Example BANDWIDTH CLASSES AND ALLOTMENTS Root Class: 10240 kbps Administration: 2048 kbps Sales: 2048 kbps Marketing: 2048 kbps Research: 2048 kbps The ZyWALL divides up the unbudgeted 2048 kbps among the classes that require more bandwidth. If the administration department only uses 1024 kbps of the budgeted 2048 kbps, the ZyWALL also divides the remaining 1024 kbps among the classes that require more bandwidth. Therefore, the ZyWALL divides a total of 3072 kbps of unbudgeted and unused bandwidth among the classes that require more bandwidth. 25.2.1.1 Priority-based Allotment of Unused and Unbudgeted Bandwidth The following table shows the priorities of the bandwidth classes and the amount of bandwidth that each class gets. Table 143 Priority-based Allotment of Unused and Unbudgeted Bandwidth Example BANDWIDTH CLASSES, PRIORITIES AND ALLOTMENTS Root Class: 10240 kbps Administration: Priority 4, 1024 kbps Sales: Priority 6, 3584 kbps Marketing: Priority 6, 3584 kbps Research: Priority 5, 2048 kbps Suppose that all of the classes except for the administration class need more bandwidth. • Each class gets up to its budgeted bandwidth. The administration class only uses 1024 kbps of its budgeted 2048 kbps. • The sales and marketing are first to get extra bandwidth because they have the highest priority (6). If they each require 1536 kbps or more of extra bandwidth, the ZyWALL divides the total 3072 kbps total of unbudgeted and unused bandwidth equally between the sales and marketing departments (1536 kbps extra to each for a total of 3584 kbps for each) because they both have the highest priority level. • Research requires more bandwidth but only gets its budgeted 2048 kbps because all of the unbudgeted and unused bandwidth goes to the higher priority sales and marketing classes. 470 ZyWALL 5/35/70 Series User's Guide