OPNET Simulation Software: An Introduction to Modeling and Performance Evaluation, Study notes of Computer Systems Networking and Telecommunications

Download OPNET Simulation Software: An Introduction to Modeling and Performance Evaluation and more Study notes Computer Systems Networking and Telecommunications in PDF only on Docsity! Introduction to OPNET CSC/ECE 570 Juan Du Oct. 11, 2006 Some pages are originally edited by Guru Ranganathan 2 Outline Introduction to Simulation Introduction to OPNET OPNET Modeler Creating Models 5 Simulation Two main types of simulation Discrete event discrete points in time, using random number generators Continuous time State changes occur continuously across time Packages E.g. OPNET (commercial), NS-2 (open source), OMNeT++ Levels of detail E.g. packet level, flow level 6 Introduction to OPNET A vast software package Modeler, IT Guru, SP Guru, … Modeler: a comprehensive development environment Features Friendly graphical user interface (GUI) Object-oriented modeling Discrete event simulator Integrated data analysis tool More scalable and efficient simulation engine Hundreds of protocol and vendor device models Flexibility to develop detailed custom models 7 OPNET Architecture The cycle is repeated until we achieve the correct objective Specification Data Collection and Simulation Analysis 10 11 Creating Models in OPNET (1-a) Project Editor Network Model Main work place for creating a network simulation Where you can : Create a network model using models from the Standard Model Library (the highest level of abstraction) Choose statistics to collect Execute a simulation View results Two options Object Palette (use built-in models) Build your own nodes 12 Creating Models in OPNET (1-b) Corresponds to the network architecture / topology 15 Creating Models in OPNET (3-a) Process Editor Process Model The lowest level of abstraction Represented by Finite State Machines (FSMs) State (icons) Transitions (lines) Operations performed in each state or for a transition are described in embedded C/C++ code blocks Creating Models in OPNET (3-b) aoa 16 17 Many Other Editors E.g. link model editor, path editor, … Probe editor Specify the statistics to be collected during simulation, e.g. delay, throughput, utilization, … Two types of statistics Global Local Two ways to collect statistics Probe editor Straight from the project editor