ZyXEL Communications P-2302HWL-P1 Series - Manual (Page 209)

P-2302HW/HWL-P1 Series User’s Guide
Chapter 17 Bandwidth MGMT 209
• 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.
17.1.7.4 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
17.1.8 Bandwidth Borrowing
Bandwidth borrowing allows a sub-class to borrow unused bandwidth from its parent class,
whereas maximize bandwidth usage allows any bandwidth class to borrow any unused or
unbudgeted bandwidth on the whole interface.
Enable bandwidth borrowing on a sub-class to allow the sub-class to use the parent class’s
unused bandwidth. The parent class’s unused bandwidth is given to the highest priority sub-
class first (see
Section 17.1.8.1 on page 210 ).
The total of the bandwidth allotments for sub-classes cannot exceed the bandwidth allotment
of the parent class. The ZyXEL Device uses the scheduler to divide the parent class’s unused
bandwidth among the sub-classes that have bandwidth borrowing enabled.
Table 88 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