ZyXEL Communications ZyWALL 1100 User Manual page 414

Figure 288 LAN1 to WAN, Outbound 200 kbps, Inbound 500 kbps
Outbound
200 kbps
Bandwidth Management Priority
• The ZyWALL/USG gives bandwidth to higher-priority traffic first, until it reaches its configured
bandwidth rate.
• Then lower-priority traffic gets bandwidth.
• The ZyWALL/USG uses a fairness-based (round-robin) scheduler to divide bandwidth among
traffic flows with the same priority.
• The ZyWALL/USG 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/USG 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.
Chapter 25 BWM (Bandwidth Management)
Inbound
500 kbps
ZyWALL/USG Series User's Guide
414