Chapter 17 Bandwidth MGMT
17.1.9 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 97 Over Allotment of Bandwidth Example
BANDWIDTH CLASSES, ALLOTMENTS | PRIORITIES | ||
Actual outgoing bandwidth available on the interface: 1000 kbps |
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Root Class: 1500 kbps (same | VoIP traffic (Service = SIP): 500 Kbps | High | |
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NetMeeting traffic (Service = H.323): 500 kbps | High | ||
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| FTP (Service = FTP): 500 Kbps | Medium | |
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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.
17.2 Bandwidth Management Screens
17.2.1 Bandwidth Management Summary Screen
Use this screen to enable bandwidth management on an interface and to set the maximum allowed bandwidth and the scheduler for the interface. You can also enable or disable maximize bandwidth usage. To access this screen, click Management > Bandwidth MGMT > Summary.
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