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How to Implement Metropolitan Area Networks in OMNeT++

To implement the Metropolitan Area Networks (MAN) in OMNeT++, we have to cover a large geographic area that is usually a city or big campus by simulating a network which contains different kinds of devices and links like routers, switches, wireless links, and optical fibers. Below is a comprehensive guide to help you get started with implementing a MAN in OMNeT++.

Step-by-Step Implementation:

  1. Set Up OMNeT++ and INET Framework
  1. Install OMNeT++:
    • Install the OMNeT++ on your system.
    • You can install it based on your operating system.
  2. Install INET Framework:
    • Install the INET framework, which provides models for network protocols and devices.
    • Within the OMNeT++ workspace, disengage the INET framework.
    • Open OMNeT++ IDE, import the INET project, and build it.
  1. Design the MAN Architecture
  1. Define the Network Structure:
    • Classify the components of MAN like core routers, edge routers, switches, and various end-user devices (for instance, servers, PCs).
    • Define the communication protocols and data flow amongst components.
  2. Create the Network Nodes:
    • Extend existing INET nodes or create new ones for certain components (like core routers, edge routers).
    • Define the parameters and properties of these nodes (for instance, processing capabilities, communication interfaces).
  1. Develop the Simulation Modules
  1. Core Router Module:
    • For core routers, create a new module or extend an existing one.
    • Execute the features like routing, packet forwarding, and handling high data throughput.
  2. Edge Router Module:
    • Define a module to represent edge routers that link end-user devices to the core network.
    • Implement functionalities like data aggregation, routing, and communication with core routers.
  3. Switch Module:
    • In local areas of the MAN, create or extend a module for switches that manage data flow within.
    • Implement functionalities like packet switching, VLAN management, and QoS.
  4. End-User Device Module:
    • Define modules for end-user devices like PCs, servers, and IoT devices.
    • Executing the features like data generation, local processing, and communication with edge routers.
  1. Implement Communication Protocols
  1. Define Communication Interfaces:
    • Among the core routers, edge routers, switches, and end-user devices, determine interfaces for communication.
    • Use INET’s message-passing system to implement data exchange mechanisms.
  2. Simulate Network Traffic:
    • Simulate the data transmission and reception among the various components of MAN by developing traffic generators.
    • Implement algorithms for data routing, load balancing, and error handling.
  1. Configure the Simulation
  1. Network Configuration File (NED):
    • Write NED files to define the network topology and configuration.
    • Specify the types and connections of nodes in the network.
  2. Simulation Configuration File (INI):
    • Create INI files to specify simulation parameters like simulation time, node properties, traffic generation rates, and logging options.
    • Configure multiple scenarios to examine the performance of your MAN implementation.
  1. Run and Analyze the Simulation
  1. Run the Simulation:
    • Compile and run the simulation by using the OMNeT++ IDE.
    • Monitor the simulation for any errors or unexpected behavior.
  2. Collect and Analyze Results:
    • Use OMNeT++’s built-in analysis tools to accumulate simulation data.
    • Analyze metrics like data rate, latency, packet loss, routing efficiency, and network scalability to evaluate the performance of MAN implementation.

Example Code Snippets

Here are some example snippets to give you an idea of what the configuration files might look like:

NED File (MANetwork.ned)

package manetwork;

import inet.node.inet.Router;

import inet.node.inet.StandardHost;

import inet.node.ethernet.EtherSwitch;

network MANetwork {

parameters:

int numCoreRouters = default(2);

int numEdgeRouters = default(4);

int numSwitches = default(6);

int numEndDevices = default(20);

submodules:

coreRouter[numCoreRouters]: Router {

@display(“p=200,200;i=device/router”);

}

edgeRouter[numEdgeRouters]: Router {

@display(“p=400,400;i=device/router”);

}

switch[numSwitches]: EtherSwitch {

@display(“p=600,600;i=device/switch”);

}

endDevice[numEndDevices]: StandardHost {

@display(“p=800,800;i=device/laptop”);

}

connections:

// Connect core routers

for i=0..numCoreRouters-2 {

coreRouter[i].pppg++ <–> coreRouter[i+1].pppg++;

}

// Connect edge routers to core routers

for i=0..numEdgeRouters-1 {

edgeRouter[i].pppg++ <–> coreRouter[i % numCoreRouters].pppg++;

}

// Connect switches to edge routers

for i=0..numSwitches-1 {

switch[i].pppg++ <–> edgeRouter[i % numEdgeRouters].pppg++;

}

// Connect end devices to switches

for i=0..numEndDevices-1 {

endDevice[i].ethg++ <–> switch[i % numSwitches].ethg++;

}

}

INI File (omnetpp.ini)

[General]

network = manetwork.MANetwork

sim-time-limit = 1000s

*.coreRouter*.ppp[*].bitrate = 10Gbps

*.edgeRouter*.ppp[*].bitrate = 1Gbps

*.switch*.eth[*].bitrate = 1Gbps

*.endDevice*.eth[0].bitrate = 100Mbps

*.endDevice*.numApps = 1

*.endDevice*.app[0].typename = “UdpBasicApp”

*.endDevice*.app[0].destAddresses = “endDevice[*]”

*.endDevice*.app[0].destPort = 5000

*.endDevice*.app[0].messageLength = 1000B

*.endDevice*.app[0].sendInterval = exponential(1s)

In the script, we brought the valuable information on how to set up and execute the MAN and from the scratch using OMNeT++. If you want any added details on this topic, we can also provide them. Implementation of Metropolitan Area Networks in OMNeT++we render complete simulation support, we work on simulating a network which contains different kinds of devices and links like routers, switches, wireless links, and optical fibers for your projects, connect with us for good guidance.

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