ZyXEL Communications 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNLI - Manual (Page 275)

P-2602HWNLI User’s Guide
Chapter 19 Bandwidth Management 275
19.6 Maximize Bandwidth Usage
The maximize bandwidth usage option (see Figure 145 on page 278 ) allows the ZyXEL
Device to divide up any available bandwidth on the interface (including unallocated
bandwidth and any allocated bandwidth that a class is not using) among the bandwidth classes
that require more bandwidth.
When you enable maximize bandwidth usage, the ZyXEL Device first makes sure that each
bandwidth class gets up to its bandwidth allotment. Next, the ZyXEL Device divides up an
interface’s available bandwidth (bandwidth that is unallocated or unused by the classes)
depending on how many bandwidth classes require more bandwidth and on their priority
levels. When only one class requires more bandwidth, the ZyXEL Device gives extra
bandwidth to that class.
When multiple classes require more bandwidth, the ZyXEL Device gives the highest priority
classes the available bandwidth first (as much as they require, if there is enough available
bandwidth), and then to lower priority classes if there is still bandwidth available. The ZyXEL
Device distributes the available bandwidth equally among classes with the same priority level.
19.6.1 Reserving Bandwidth for Non-Bandwidth Class Traffic
Do the following to configure the ZyXEL Device to allow bandwidth for traffic that is not
defined in a bandwidth filter.
1 Do not enable the interface’s Maximize Bandwidth Usage option.
2 Leave some of the interface’s bandwidth unallocated. Make sure that the interface’s root
class has more bandwidth than the sum of the bandwidths of the interface’s bandwidth
management rules.
19.6.2 Maximize Bandwidth Usage Example
Here is an example of a ZyXEL Device that has maximize bandwidth usage enabled on an
interface. The following table shows each bandwidth class’s bandwidth budget. The classes
are set up based on subnets. The interface is set to 10240 kbps. Each subnet is allocated 2048
kbps. The unallocated 2048 kbps allows traffic not defined in any of the bandwidth filters to
go out when you do not select the maximize bandwidth option.
Table 103 Maximize Bandwidth Usage Example
BANDWIDTH CLASSES AND ALLOTMENTS
Root Class: 10240 kbps Administration: 2048 kbps
Sales: 2048 kbps
Marketing: 2048 kbps
Research: 2048 kbps