ZyXEL Communications NXC5200 User Manual page 269

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 NXC 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
Note: This section uses examples that assume the device is operating in routing
mode, not bridge mode.
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 118 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 96 Configured Rate Effect
POLICY CONFIGURED RATE MAX. B. U. PRIORITY
A
B
NXC5200 User's Guide
1000 kbps
1000 kbps
300 kbps No
200 kbps No
Chapter 19 Application Patrol
BWM
1000 kbps
ACTUAL RATE
1 300 kbps
1 200 kbps
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