Mobile Networks

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Mobile Networks

• Introduction to Opnet
• faizaiqbal_at_ceme.nust.edu.pk

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Opnet Workflow

• Project Editor

Run Simulation
View and Analyze Results
Create Network Models
Choose Statistics
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Opnets editors

• Network Models
• Represent data networks
• Run simulations on network
• Node Models
• Model devices in the network
• Process Models
• Represent communication protocols, CPUs, queuing
  systems

Process
Node
Network
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Network model Project Editor
Project Editor Workspace
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Node model Node editor
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Process model Process Editor

• Finite state machines (FSM)
• States and transitions coded in C or C

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And many more editors

• Link editor
• Path editor
• Packet format editor
• Probe editor
• Simulation sequence editor
• Modulation curve editor
• Antenna pattern editor, etc.

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Projects and Scenarios

• Project-and-Scenario approach to modeling network
• Project collection of related network scenarios.
  
• Scenario is a single instance of the network.
  Typically, a scenario represents a unique
  configuration of the network.

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The Project/Scenario Workflow

• Create Project
• Create Baseline Scenario
• Import or create topology
• Import or create traffic
• Choose results
• Run simulation, view results
• Duplicate Scenario
• Make changes
• Re-run simulation
• Compare results

Iterate
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Object Hierarchy

• Subnets represent various network objects in a
  single component (may contain various LAN, node
  and link models)
• LAN a local area network abstracted as a single
  node
• Nodes represent servers, switches, gateways,
  workstations, or any other physical device
• Links represent the physical link between nodes

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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

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Run Simulation
View and Analyze Results
Create Network Models
Choose Statistics
1) Create the network
New project New scenario -gt Startup Wizard
Topology Rapid Configuration Star
Choose switch Choose wkst (30
stations) Size office network, 100 x 100
m
Object Palette Choose server
Choose link
between server and switch (10BaseT)
2) Create the traffic Object Palette
Application configuration (database access)
Profile definition
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Run Simulation
View and Analyze Results
Create Network Models
Choose Statistics
3) Choose statistics
Object statistic (server) SERVER LOAD
(bps) Global statistic ETHERNET DELAY (sec)
4) Simulation Configure simulation
Time 0.5 h Seed
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• Well do the small internetwork example in the
  lab
• Important concepts to remember
• Project Editor gt to create a network
• Node Editor gt to model network equipment
• Process Editor gt to model modules (functions)
• of the network equipment
• Object Palette gt a collection of node models
• Project scenario 1, scenario 2, ..

Process
Node
Network
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Simple Client-Server Network

• simple example of OPNET IT Guru to demonstrate
  the basic operations in creating and simulation a
  model

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• Start a new project File-gtNew...-gtProject. Give
  a useful name to the project and scenario (e.g.
  ProjectDemoClientServer).
• Follow the dialog boxes, selecting the following
  options
• Initial Topology Create Empty Scenario
• Network Scale Office
• Size 100m by 100m
• Model Family ethernet

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• The office area will be created and the Object
  Palette opened. Place the following objects in
  the network Application Config
• Profile Config
• ethernet_wkstn (will be our client)
• ethernet_server (will be our server)
• ethernet16_switch (a 16 port switch to connect
  our client and server)
• 100BaseT links (connect the client to switch and
  switch to server)

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• Give the objects meaningful names by right-click
  and select Set Name. E.g. Client, Switch, Server,
  Applications, Profiles.
• In the Application Definition object (now called
  Applications), right-click and select Edit
  Attributes
• Select Application Definitions and set the rows
  to 1
• For Row 0, give the application a name (such as
  Web)
• In the Description attribute, for HTTP, select
  Image Browsing Press Ok to close the attributes
  for the Applications.

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• Edit attributes for the Profiles, add a new
  profile with name Web User For the Web User
  profile, add a new application (set rows to 1)
• Select the Web application Press Ok to close the
  attributes for the Profiles.
• Right-click on the Server and select Edit
  Attributes Set Application Supported Services to
  All, and then press Ok
• Right-click on the Client and select Edit
  Attributes Under Application Supported Profiles
  add a new row and select the Web User profile,
  then press Ok

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• Right-click on the Client and select Choose
  Individual Statistics Select all items under
  Client HTTP (they will have green ticks after you
  select them)
• Repeat the above two steps for the Server and
  Switch, however select the statistics Server HTTP
  for the Server and Switch for the Switch.
• From the main menu select Simulation-gtChoose
  Individual Statistics... Under Global Statistics,
  select all items under HTTP and Ethernet, and
  then press Ok

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• From the main menu select Simulation-gtConfigure
  Discrete Event Simulation... Press the Run
  button.
• Your simulation will take several seconds to
  execute, finally ending with a message showing
  the Beginning simulation and time and Simulation
  Completed - Collating Results.
• Press the Close button. From the main menu select
  Results-gtView Results... Select the following
  three statistics
• Object Statistics-gtOffice Network-gtClient-gtClient
  HTTP-gtTraffic Sent (bytes/sec)
• Object Statistics-gtOffice Network-gtClient-gtClient
  HTTP-gtTraffic Received (bytes/sec)
• Object Statistics-gtOffice Network-gtClient-gtClient
  HTTP-gtPage Response Time (seconds)
• Press the Show button

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• After looking at the results (you can right-click
  in the results window to make changes), return to
  the View Results window Click on the As Is option
  and select instead average, then press Show
  again.
• Close both of the plot panels - select Hide for
  each.
• Close the View Results window.

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Lab Task

• From the main menu select Scenarios-gtDuplicate
  Scenario... and select a name such as
  Client2_Server
• Add a new client (you can use copy and paste) so
  you now have Client1 and Client2 From the main
  menu select Results-gtDelete All Panels
• Choose the same statistics for Client2 as in the
  previous scenario, run a simulation and view the
  results again.
• Compare the page response time for Client1 and
  Client2.