ZyXEL Communications Prestige 652, User Manual, Page: 241 / 521

Prestige 652 Series User’s Guide
Bandwidth Management 21-9
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.
21.7.2 Maximize Bandwidth Usage With Bandwidth Borrowing
If you configure both maximize bandwidth usage (on the interface) and bandwidth borrowing (on individual
child-classes), the Prestige functions as follows.
1. The Prestige sends traffic according to each bandwidth class’s bandwidth budget.
2. The Prestige assigns a parent class’s unused bandwidth to its child-classes that have more
traffic than their budgets and have bandwidth borrowing enabled. The Prestige gives
priority to bandwidth child-classes of higher priority and treats bandwidth classes of the
same priority equally.
3. The Prestige assigns any remaining unused or unbudgeted bandwidth on the interface to
any bandwidth class that requires it. The Prestige gives priority to bandwidth classes of
higher priority and treats bandwidth classes of the same level equally.
4. The Prestige assigns any remaining unbudgeted bandwidth to traffic that does not match
any of the bandwidth classes.
21.8 Configuring Summary
Click BW Manager , Summary to open the Summary screen.
Enable bandwidth management on an interface and set the maximum allowed bandwidth for that interface.