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2. Introduction of
Simulation and OPNET

3. Outline
Ways to study a system
Advantages of simulation
OPNET modeler
Main features of OPNET simulator
OPNET workflow
OPNET’s hierarchal modeling
Editors
Project and scenarios
The project and scenario workflow
Organizing models- Object palette
Choose statistics
Simulation
What’s next
References

4. Ways to Study a system

5. Advantages of Simulation
Money, money, money
Designing, building, testing,
Redesigning, rebuilding, retesting,…
The level of detail that you can get from a simulation
The only restrictions are your imagination, your programming skills, and your CPU.

6. OPNET Modeler
OPNET stands for Optimum Network Performance.
OPNET is a computer software to simulate communication networks.
OPNET Modeler, in particular, is a research oriented package, and it is one of the leading
simulators used in the industry.

7. OPNET Modeler (cont..)
OPNET provides graphical editors to you to edit your own devices,
configure your own networks, design your own protocols, define your
own packet formats, etc.

8. Main features of OPNET simulator
The graphical modeling approach(Graphical user interface).
The generation of statistical data is customizable.
A variety of comprehensive analysis tools.

9. OPNET Workflow
Create
network
models
Choose
statistics
Run
simulation
View and
analyze
results

10. OPNET’s Hierarchical Modeling
Three-Tiered Hierarchical Modeling
◦ Network
◦ Node
◦ Process

11. Editors
Network Editor
 Specify network topology and configure nodes and links. Choose results, run simulations and
view results

12. Editors (cont..)
Node Editor
 Create models of nodes by specifying internal structure and capabilities
Create your own devices

13. Editors (cont..)
Process Editor
◦ Develop models of decision-making processes representing protocols, algorithms, resource
management, operating systems, etc.

14. Editors (cont..)
Link Model Editor
Path Editor
Packet Format Editor
PDF Editor
etc

15. Project and Scenarios
Project-and-Scenario approach to modeling network
Project: Collection of related network scenarios.
Scenario: is a single instance of the network. It represents a unique configuration of the
network.

16. The Project/Scenarios Workflow
Create project
Create Baseline scenario
 Import or create topology (using Object palette-next slide)
 Import or create traffic (by creating applications and profiles)
 Choose results
 Run simulation, view results
Duplicate scenario
 Make changes
 Re-run simulation
 Compare results
((Iterate the last three steps until you have good results))

17. Organizing models- Object palettes
An object palette is a graphical dialog box that displays a group of nodes and link models.
Object palettes can be customized to contain only the nodes and links that we need.

18. Choose Statistics
Right click  quick menu
◦ Edit attributes  Choose individual statistics  Check the statistics that you need.

19. Simulation
Select Duration, Seed, other Attributes
Run the Simulation
View Graphs produced
Analyze