Configuring Summary; Figure 17-6 Bandwidth Borrowing Example - ZyXEL Communications ZyWALL 5 User Manual

ZyWALL 5 Internet Security Appliance
The Administration class cannot borrow unused bandwidth from the Root class because the
Administration class has bandwidth borrowing disabled.
The Marketing class can borrow unused bandwidth from the Root class because the Marketing
class has bandwidth borrowing enabled.
The R&D class can borrow unused bandwidth from the Root class because the R&D class has
bandwidth borrowing enabled.
17.7.2 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.
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.

17.8 Configuring Summary

Click BW MGMT to open the Summary screen.
Enable bandwidth management on an interface and set the maximum allowed bandwidth for that
interface.
17-6

Figure 17-6 Bandwidth Borrowing Example

Bandwidth Management