ZyXEL Communications ZyXEL ZyWALL 5 - Manual (Page 309)

ZyWALL 5 User’s Guide
308 Chapter 19 Bandwidth Management
19.9.1 Bandwidth Borrowing Example
Here is an example of bandwidth management with classes configured for bandwidth
borrowing. The classes are set up based on departments and individuals within certain
departments.
• The Sales class cannot borrow unused bandwidth from the Root class because the Sales
class has bandwidth borrowing disabled.
19.9.2 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 sub-classes of higher priority and treats classes of the same priority equally.
3 The 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.
4 If 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.
19.10 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.
Table 105 Bandwidth Borrowing Example
BANDWIDTH CLASSES AND BANDWIDTH BORROWING SETTINGS
Root Class: Administration: Borrowing Enabled
Sales: Borrowing Disabled
Marketing: Borrowing Enabled
Research: Borrowing Enabled