Bandwidth Borrowing; Bandwidth Borrowing Example; Table 103 Fairness-Based Allotment Of Unused And Unbudgeted Bandwidth Example - ZyXEL Communications ZYWALL 2 PLUS User Manual

19.7.5.2 Fairness-based Allotment of Unused and Unbudgeted Bandwidth
The following table shows the amount of bandwidth that each class gets.

Table 103 Fairness-based Allotment of Unused and Unbudgeted Bandwidth Example

BANDWIDTH CLASSES 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 ZyWALL 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.

19.8 Bandwidth Borrowing

Bandwidth borrowing allows a sub-class to borrow unused bandwidth from its parent class,
whereas maximize bandwidth usage allows bandwidth classes 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 its parent class's
unused bandwidth. A parent class's unused bandwidth is given to the highest priority sub-class
first. The sub-class can also borrow bandwidth from a higher parent class (grandparent class)
if the sub-class's parent class is also configured to borrow bandwidth from its parent class.
This can go on for as many levels as are configured to borrow bandwidth from their parent
class (see Section 19.8.1 on page
The total of the bandwidth allotments for sub-classes cannot exceed the bandwidth allotment
of their parent class. The ZyWALL uses the scheduler to divide a parent class's unused
bandwidth among the sub-classes.

19.8.1 Bandwidth Borrowing Example

Here is an example of bandwidth management with classes configured for bandwidth
borrowing. The classes are set up based on departments and individuals within certain
departments.
ZyWALL 2 Plus User's Guide
Administration: 1024 kbps
Sales: 3072 kbps
Marketing: 3072 kbps
Research: 3072 kbps
333).
Chapter 19 Bandwidth Management
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