ZyWALL 5/35/70 Series User’s Guide

•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.

25.9Maximize 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.

1The ZyWALL sends traffic according to each bandwidth class’s bandwidth budget.

2The 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.

3The 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.

4If the bandwidth requirements of all of the traffic classes are met and there is still some unbudgeted bandwidth, the ZyWALL assigns it to traffic that does not match any of the classes.

25.10Configuring Summary

Click ADVANCED, BW MGMT to open the Summary screen.

Enable bandwidth management on an interface and set the maximum allowed bandwidth for that interface.

Chapter 25 Bandwidth Management

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