ZyXEL Communications ZyWall ATP series User Manual page 429

Chapter 23 BWM (Bandwidth Management)
Maximize Bandwidth Usage
Maximize bandwidth usage allows applications with maximize bandwidth usage enabled to "borrow"
any unused bandwidth on the out-going interface.
After each application gets its configured bandwidth rate, the Zyxel Device uses the fairness- based
scheduler to divide any unused bandwidth on the out-going interface amongst applications that need
more bandwidth and have maximize bandwidth usage enabled.
Unused bandwidth is divided equally. Higher priority traffic does not get a larger portion of the unused
bandwidth.
Bandwidth Management Behavior
The following sections show how bandwidth management behaves with various settings. For example,
you configure DMZ to WAN policies for FTP servers A and B. Each server tries to send 1000 kbps, but the
WAN is set to a maximum outgoing speed of 1000 kbps. You configure policy A for server A's traffic and
policy B for server B's traffic.
Figure 296 Bandwidth Management Behavior
Configured Rate Effect
In the following table the configured rates total less than the available bandwidth and maximize
bandwidth usage is disabled, both servers get their configured rate.
Table 169 Configured Rate Effect
POLICY CONFIGURED RATE
A 300 kbps
B 200 kbps
MAX. B. U. PRIORITY
No
No
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ACTUAL RATE
1 300 kbps
1 200 kbps