ZyXEL Communications 10 - Manual (Page 326)

ZyWALL 10~100 Series Internet Security Gateway
25-10 Bandwidth Management
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 R&D Software and Hardware classes can both borrow unused bandwidth from the R&D class
because the R&D Software and Hardware classes both have bandwidth borrowing enabled.
The R&D Software and Hardware classes can also borrow unused bandwidth from the Root class
because the R&D class also has bandwidth borrowing enabled.
25.7.2 Maximize Bandwidth Usage With Bandwidth Borrowing
If you configure both maximize bandwidth usage (on the interface) and bandwidth borrowing (on
individual child-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 child-classes that have
more traffic than their budgets and have bandwidth borrowing enabled. The ZyWALL
gives priority to bandwidth child-classes of higher priority and treats bandwidth classes of
the same priority equally.
3. The ZyWALL assigns any remaining unused or unbudgeted bandwidth on the interface to
any bandwidth class that requires it. The ZyWALL gives priority to bandwidth classes of
higher priority and treats bandwidth classes of the same level equally.
4. The ZyWALL assigns any remaining unbudgeted bandwidth to traffic that does not match
any of the bandwidth classes.
25.8 Bandwidth Management Setup
Use the web configurator to access the bandwidth management screens (refer to the chapter on using the
ZyWALL web configurator).
Click Advanced and then BW Manager to access the bandwidth management configuration screens.