Traffic Classes
Traffic classes represent end-to-end connections. A traffic class has
the following parameters:
Source node and destination
node
Start time and end
time (in seconds)
Bulk TCP connection
or UDP connection
A bulk TCP connection transfers data as fast as possible subject to the
TCP profile (i.e., congestion control) and network condition. A UDP connection
generates packets according to a Poisson process of specified rate.
Routes of a Traffic Class
Packets of a traffic class are routed on a shortest path from the source
to the destination. When there are multiple shortest paths between two
nodes, one of the shortest paths is randomly chosen and it is used by all
traffic classes established between the two nodes.
Routes are computed by doing the Compute Routes command or the
Compute Metrics command. Once the routes are computed, you can observe
the path of a traffic class by selecting the traffic class in the Traffic
View; this highlights the path in the Topology View.
To Add a Traffic Class
Use the right mouse button menu command Start Traffic From Here
on the source node, and Destination Here on the second one, then
fill the desired traffic class information in the dialog that appears.
To cancel the traffic class creation, use the Cancel Class command,
which appears in the right mouse button menu.
To Delete a Traffic Class
Use the right mouse button menu in the left window side tree control and
choose the Delete Class command.
To Modify a Traffic Class
Use the right mouse button menu in the left window side tree control and
choose the Properties command.
To Load/Save the Traffic Classes
The entire traffic specification for a network can be saved in a file (and
reloaded later). This is useful when you want to analyze multiple types
of workload for the same network topology. To do this, use the Load
Traffic and Save Traffic commands from the Productivity
menu. It is also a possible to delete all the traffic classes by using
the Productivity / Delete All Traffic command.
To Automatically Generate TCP Traffic
Use the Generate TCP Traffic command from the Productivity Menu.
Fill in the parameters in the dialog that appears.