ZyXEL Communications ISG50-ISDN User Manual page 399

• Inbound traffic is limited to 500 kbs. The connection initiator is on the LAN1 so inbound means
the traffic traveling from the WAN to the LAN1.
Figure 260 LAN1 to WAN, Outbound 200 kbps, Inbound 500 kbps
Outbound
200 kbps
Bandwidth Management Priority
• The ISG50 gives bandwidth to higher-priority traffic first, until it reaches its configured
bandwidth rate.
• Then lower-priority traffic gets bandwidth.
• The ISG50 uses a fairness-based (round-robin) scheduler to divide bandwidth among traffic flows
with the same priority.
• The ISG50 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 ISG50 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
ISG50 User's Guide
Inbound
500 kbps
Chapter 25 Bandwidth Management
399