Bandwidth Borrowing Example; Maximize Bandwidth Usage With Bandwidth Borrowing; Table 113 Bandwidth Borrowing Example - ZyXEL Communications ZyWall 70 User Manual

ZyWALL 70 User's Guide
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.

20.9.1 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.

Table 113 Bandwidth Borrowing Example

BANDWIDTH CLASSES AND BANDWIDTH BORROWING SETTINGS
Root Class:
• The Bill class can borrow unused bandwidth from the Sales USA class because the Bill
class has bandwidth borrowing enabled.
• The Bill class can also borrow unused bandwidth from the Sales class because the Sales
USA class also has bandwidth borrowing enabled.
• The Bill class cannot borrow unused bandwidth from the Root class because the Sales
class has bandwidth borrowing disabled.
• The Amy class cannot borrow unused bandwidth from the Sales USA class because the
Amy class has bandwidth borrowing disabled.
• The Research Software and Hardware classes can both borrow unused bandwidth from
the Research class because the Research Software and Hardware classes both have
bandwidth borrowing enabled.
• The Research Software and Hardware classes can also borrow unused bandwidth from
the Root class because the Research class also has bandwidth borrowing enabled.

20.9.2 Maximize Bandwidth Usage With Bandwidth Borrowing

If you configure both maximize bandwidth usage (on the interface) and bandwidth borrowing
(on individual sub-classes), the ZyWALL functions as follows.
1 The ZyWALL sends traffic according to each bandwidth class's bandwidth budget.
330
Administration: Borrowing
Enabled
Sales: Borrowing Disabled
Marketing: Borrowing
Enabled
Research: Borrowing
Enabled
Sales USA: Borrowing
Enabled
Sales Asia: Borrowing
Disabled
Software: Borrowing
Enabled
Hardware: Borrowing
Enabled
Chapter 20 Bandwidth Management
Bill: Borrowing Enabled
Amy: Borrowing Disabled
Tina: Borrowing Enabled
Fred: Borrowing Disabled