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Chapter 20 Bandwidth Management
ZyWALL 2WG User’s Guide
416
Refer to the product specifications in the appendix to see how many class levels you can
configure on your ZyWALL.
• 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 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.
2 The ZyWALL assigns a parent class’s unused bandwidth to its sub-classes that have
more traffic than their budgets and have bandwidth borrowing enabled. The ZyWALL
gives priority to sub-classes of higher priority and treats classes of the same priority
equally.
3 The ZyWALL assigns any remaining unused or unbudgeted bandwidth on the interface
to any class that requires it. The ZyWALL gives priority to classes of higher priority and
treats classes of the same level equally.
Table 129 Bandwidth Borrowing Example
BANDWIDTH CLASSES AND BANDWIDTH BORROWING SETTINGS
Root Class: Administration: Borrowing
Enabled
Sales: Borrowing Disabled Sales USA: Borrowing
Enabled
Bill: Borrowing Enabled
Amy: Borrowing Disabled
Sales Asia: Borrowing
Disabled
Tina: Borrowing Enabled
Fred: Borrowing Disabled
Marketing: Borrowing
Enabled
Research: Borrowing
Enabled
Software: Borrowing
Enabled
Hardware: Borrowing
Enabled