ZyXEL Communications ZyWALL 110 Series, User Manual, Page: 351 / 562

Chapter 25 Bandwidth Management
ZyWALL 110/310/1100 Series User’s Guide
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Figure 230
LAN1 to WAN, Outbound 200 kbps, Inbound 500 kbps
Bandwidth Management Priority
• The ZyWALL gives bandwidth to higher-priority traffic first, until it reaches its configured
bandwidth rate.
• Then lower-priority traffic gets bandwidth.
• The ZyWALL uses a fairness-based (round-robin) scheduler to divide bandwidth among traffic
flows with the same priority.
• The ZyWALL automatically treats traffic with bandwidth management disabled as priority 7 (the
lowest priority).
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 ZyWALL 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.
Inbound
Outbound
500 kbps
200 kbps