ZyXEL Communications P-660HW-DX, User Manual

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Chapter 13 Bandwidth Management
P-660HW-Dx User’s Guide
190
The ZyXEL Device 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 ZyXEL Device also divides the remaining 1024 kbps among the classes that require more
bandwidth. Therefore, the ZyXEL Device divides a total of 3072 kbps of unbudgeted and
unused bandwidth among the classes that require more bandwidth.
13.6.2.1 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.
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 ZyXEL Device
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.
13.6.2.2 Fairness-based Allotment of Unused and Unbudgeted Bandwidth
The following table shows the amount of bandwidth that each class gets.
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 ZyXEL Device divides the total 3072 kbps total of unbudgeted and unused bandwidth
equally among the other classes. 1024 kbps extra goes to each so the other classes each get
a total of 3072 kbps.
Table 71 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
Table 72 Fairness-based Allotment of Unused and Unbudgeted Bandwidth Example
BANDWIDTH CLASSES AND ALLOTMENTS
Root Class: 10240 kbps Administration: 1024 kbps
Sales: 3072 kbps
Marketing: 3072 kbps
Research: 3072 kbps