Maximize Bandwidth Usage Example; Table 103 Maximize Bandwidth Usage Example; Table 104 Priority-Based Allotment Of Unused And Unbudgeted Bandwidth Example - ZyXEL Communications ZyWALL 2 Plus User Manual

Chapter 19 Bandwidth Management
2 Do not enable the interface's Maximize Bandwidth Usage option.
3 Do not enable bandwidth borrowing on the sub-classes that have the root class as their
parent (see

19.7.5 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 103 Maximize Bandwidth Usage Example

BANDWIDTH CLASSES AND ALLOTMENTS
Root Class: 10240 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.
19.7.5.1 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 104 Priority-based Allotment of Unused and Unbudgeted Bandwidth Example

BANDWIDTH CLASSES, PRIORITIES AND ALLOTMENTS
Root Class: 10240 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.
354
Section 19.8 on page 355).
Administration: 2048 kbps
Sales: 2048 kbps
Marketing: 2048 kbps
Research: 2048 kbps
Administration: Priority 4, 1024 kbps
Sales: Priority 6, 3584 kbps
Marketing: Priority 6, 3584 kbps
Research: Priority 5, 2048 kbps
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