ZyXEL P-660HW-T1 v2 User Guide - Page 184
Over Allotment of Bandwidth, Configuring Summary
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P-660HW-T v2 User's Guide 13.7 Over Allotment of Bandwidth You can set the bandwidth management speed for an interface higher than the interface's actual transmission speed. Higher priority traffic gets to use up to its allocated bandwidth, even if it takes up all of the interface's available bandwidth. This could stop lower priority traffic from being sent. The following is an example. Table 70 Over Allotment of Bandwidth Example BANDWIDTH CLASSES, ALLOTMENTS Actual outgoing bandwidth available on the interface: 1000 kbps Root Class: 1500 kbps (same VoIP traffic (Service = SIP): 500 Kbps as Speed setting) NetMeeting traffic (Service = H.323): 500 kbps FTP (Service = FTP): 500 Kbps PRIORITIES High High Medium If you use VoIP and NetMeeting at the same time, the device allocates up to 500 Kbps of bandwidth to each of them before it allocates any bandwidth to FTP. As a result, FTP can only use bandwidth when VoIP and NetMeeting do not use all of their allocated bandwidth. Suppose you try to browse the web too. In this case, VoIP, NetMeeting and FTP all have higher priority, so they get to use the bandwidth first. You can only browse the web when VoIP, NetMeeting, and FTP do not use all 1000 Kbps of available bandwidth. 13.8 Configuring Summary Click Advanced > Bandwidth MGMT to open the screen as shown next. Enable bandwidth management on an interface and set the maximum allowed bandwidth for that interface. Figure 102 Bandwidth Management: Summary 184 Chapter 13 Bandwidth Management