Maximize Bandwidth Usage With Bandwidth Borrowing; Figure 161 Bandwidth Borrowing Example - ZyXEL Communications ZyWall 35 User Manual

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• The Sales USA class can borrow unused bandwidth from the Sales class because the

Sales USA class has bandwidth borrowing enabled.

• The Sales USA class cannot borrow unused bandwidth from the Root class because the

Sales class has bandwidth borrowing disabled.

• The Sales Asia class cannot borrow unused bandwidth from the Sales class because the

Sales Asia 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.

19.7.2 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.

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 bandwidth sub-classes of higher priority and treats bandwidth classes of the

same priority equally.

Chapter 19 Bandwidth Management

ZyWALL 35 User's Guide