ZyXEL 2WG Guida Utente
Chapter 21 Bandwidth Management Screens
ZyWALL 2WG User’s Guide
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Fairness-based Scheduler
The ZyWALL divides bandwidth equally among bandwidth classes when using the fairness-
based scheduler; thus preventing one bandwidth class from using all of the interface’s
bandwidth.
based scheduler; thus preventing one bandwidth class from using all of the interface’s
bandwidth.
Maximize Bandwidth Usage
The maximize bandwidth usage option allows the ZyWALL 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 ZyWALL first makes sure that each
bandwidth class gets up to its bandwidth allotment. Next, the ZyWALL divides up an
interface’s available bandwidth (bandwidth that is unbudgeted 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 ZyWALL gives extra bandwidth to
that class.
When multiple classes require more bandwidth, the ZyWALL 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 ZyWALL distributes
the available bandwidth equally among classes with the same priority level.
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 ZyWALL first makes sure that each
bandwidth class gets up to its bandwidth allotment. Next, the ZyWALL divides up an
interface’s available bandwidth (bandwidth that is unbudgeted 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 ZyWALL gives extra bandwidth to
that class.
When multiple classes require more bandwidth, the ZyWALL 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 ZyWALL distributes
the available bandwidth equally among classes with the same priority level.
21.2 Bandwidth Management Examples
21.2.1 Application and Subnet-based Bandwidth Management
Example
Example
You could also create bandwidth classes based on a combination of a subnet and an
application. The following example table shows bandwidth allocations for application specific
traffic from separate LAN subnets.
application. The following example table shows bandwidth allocations for application specific
traffic from separate LAN subnets.
21.3 Maximize Bandwidth Usage With Bandwidth Borrowing
Example
Example
If you configure both maximize bandwidth usage (on the interface) and bandwidth borrowing
(on individual sub-classes), the ZyWALL functions as follows.
(on individual sub-classes), the ZyWALL functions as follows.
Table 123 Application and Subnet-based Bandwidth Management Example
TRAFFIC TYPE
FROM SUBNET A
FROM SUBNET B
VoIP
64 Kbps
64 Kbps
Web
64 Kbps
64 Kbps
FTP
64 Kbps
64 Kbps
E-mail
64 Kbps
64 Kbps
Video
64 Kbps
64 Kbps