User`s guide

Chapter 18 Bandwidth Management Screens
LAN-Cell 2 User’s Guide
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Scheduler
The scheduler divides up an interface’s bandwidth among the bandwidth classes. The LAN-
Cell has two types of scheduler: fairness-based and priority-based.
Priority-based Scheduler
With the priority-based scheduler, the LAN-Cell forwards traffic from bandwidth classes
according to the priorities that you assign to the bandwidth classes. The larger a bandwidth
class’s priority number is, the higher the priority. Assign real-time applications (like those
using audio or video) a higher priority number to provide smoother operation.
Fairness-based Scheduler
The LAN-Cell 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.
Maximize Bandwidth Usage
The maximize bandwidth usage option allows the LAN-Cell 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 LAN-Cell first makes sure that each
bandwidth class gets up to its bandwidth allotment. Next, the LAN-Cell 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 LAN-Cell gives extra bandwidth to
that class.
When multiple classes require more bandwidth, the LAN-Cell 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 LAN-
Cell distributes the available bandwidth equally among classes with the same priority level.
18.1.3 Bandwidth Management Examples
18.1.3.1 Application and Subnet-based Bandwidth Management 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.
Table 131 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