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How to Implement dynamic routing in OMNeT++

To implement the dynamic routing in OMNeT++ encompasses to making a network where routing decisions are always up to date based on the present network conditions like link failures, traffic load, or changing topologies. The dynamic routing is important for adapting the network changes in real-time and make sure effective data delivery. The given below is step-by-step procedure is helpful to implement dynamic routing in OMNeT++ by using the INET framework.

Step-by-Step Implementations:

Step 1: Set Up OMNeT++ and INET Framework

  1. Install OMNeT++:
    • Make certain OMNeT++ is installed on the system. We can download it from the OMNeT++
  2. Install the INET Framework:
    • Download and install the INET Framework. It offers different networking protocols and models. This framework can be downloaded from the INET GitHub repository.

Step 2: Create a New OMNeT++ Project

  1. Create the Project:
    • Open OMNeT++ and make a new OMNeT++ project through File > New > OMNeT++ Project.
    • Name the project like DynamicRoutingSimulation and set up the project directory.
  2. Set Up Project Dependencies:
    • Make sure the project references the INET Framework by right-clicking on the project in the Project Explorer, directing to Properties > Project References, and verifying the INET project.

Step 3: Define the Network Topology

  1. Create a NED File:
    • State the network topology using the NED language. This topology will embrace routers or hosts that will use dynamic routing.

Example:

network DynamicRoutingNetwork

{

submodules:

router1: Router;

router2: Router;

router3: Router;

router4: Router;

connections:

router1.ethg++ <–> Eth10Mbps <–> router2.ethg++;

router2.ethg++ <–> Eth10Mbps <–> router3.ethg++;

router3.ethg++ <–> Eth10Mbps <–> router4.ethg++;

router4.ethg++ <–> Eth10Mbps <–> router1.ethg++;

}

  1. Configure Network Parameters:
    • Set up the required link parameters like bandwidth, delay, and packet loss to create a lifelike network situation.

Step 4: Implement the Dynamic Routing Protocol

  1. Define the Dynamic Routing Module:
  • For the dynamic routing protocol to make a new module in NED. This module will handle routing decisions based on real-time network conditions.

Example (in NED):

simple DynamicRouting

{

parameters:

@display(“i=block/network2”);

gates:

inout lowerLayerIn;

inout lowerLayerOut;

}

  1. Implement Dynamic Routing Logic in C++:
    • Execute the routing logic in C++ that dynamically bring up to date the routing table based on factors like link costs, network congestion, or other metrics.

Example (C++ implementation):

#include “inet/common/INETDefs.h”

#include “inet/networklayer/contract/IRoutingTable.h”

#include “inet/networklayer/ipv4/IPv4RoutingTable.h”

class DynamicRouting : public cSimpleModule

{

private:

std::map<std::string, double> linkMetrics;  // Stores dynamic metrics for each link

IRoutingTable *routingTable;

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

void updateLinkMetrics();

void calculateRoutes();

};

Define_Module(DynamicRouting);

void DynamicRouting::initialize() {

routingTable = getModuleFromPar<IRoutingTable>(par(“routingTableModule”), this);

// Initialize link metrics with default values

linkMetrics[“router1-router2”] = 1.0;

linkMetrics[“router2-router3”] = 1.0;

linkMetrics[“router3-router4”] = 1.0;

linkMetrics[“router4-router1”] = 1.0;

// Start periodic updates of link metrics

scheduleAt(simTime() + 1, new cMessage(“UpdateLinkMetrics”));

}

void DynamicRouting::handleMessage(cMessage *msg) {

if (msg->isSelfMessage()) {

updateLinkMetrics();

calculateRoutes();

scheduleAt(simTime() + 1, msg);  // Reschedule the update

} else {

// Handle incoming packets and route them based on the current routing table

}

}

void DynamicRouting::updateLinkMetrics() {

// Here, you would collect data about current network conditions (e.g., congestion, delay)

// For this example, we simulate changing link metrics randomly

linkMetrics[“router1-router2”] = uniform(0.5, 2.0);

linkMetrics[“router2-router3”] = uniform(0.5, 2.0);

linkMetrics[“router3-router4”] = uniform(0.5, 2.0);

linkMetrics[“router4-router1”] = uniform(0.5, 2.0);

EV << “Updated link metrics: ”

<< “r1-r2: ” << linkMetrics[“router1-router2”]

<< “, r2-r3: ” << linkMetrics[“router2-router3”]

<< “, r3-r4: ” << linkMetrics[“router3-router4”]

<< “, r4-r1: ” << linkMetrics[“router4-router1”] << endl;

}

void DynamicRouting::calculateRoutes() {

// Use Dijkstra’s algorithm or any other algorithm to select the best routes

// based on the current link metrics and update the routing table accordingly

// For simplicity, this example assumes a direct link update approach

routingTable->clear();

IPv4Route *newRoute = new IPv4Route();

newRoute->setDestination(Ipv4Address::resolve(“router3”));

newRoute->setNetmask(Ipv4Address::ALLONES_ADDRESS);

if (linkMetrics[“router1-router2”] < linkMetrics[“router4-router1”]) {

newRoute->setGateway(Ipv4Address::resolve(“router2”));

newRoute->setInterface(routingTable->getInterfaceByName(“eth0”));

} else {

newRoute->setGateway(Ipv4Address::resolve(“router4”));

newRoute->setInterface(routingTable->getInterfaceByName(“eth1”));

}

newRoute->setSourceType(IPv4Route::MANUAL);

routingTable->addRoute(newRoute);

EV << “Calculated and updated routes based on current link metrics.” << endl;

}

    • Dynamic Link Metrics: The module maintains and occasionally updates link metrics based on present network conditions.
    • Routing Decision: The module dynamically evaluates the best routes using algorithms like Dijkstra’s, considering of the updated link metrics.
    • Routing Table Updates: The routing table is updated corresponding to the certain best routes.

Step 5: Set Up the Simulation

  1. Configure the Simulation in omnetpp.ini:
  • Set up the simulation parameters, like network settings, traffic patterns and simulation time.

Example:

[General]

network = DynamicRoutingNetwork

sim-time-limit = 100

# Enable scalar and vector recording for analysis

**.scalar-recording = true

**.vector-recording = true

# Application traffic configuration (if needed)

*.router1.numApps = 1

*.router1.app[0].typename = “UdpBasicApp”

*.router1.app[0].destAddress = “router3”

*.router1.app[0].destPort = 5000

*.router1.app[0].messageLength = 1024B

*.router1.app[0].sendInterval = uniform(1s, 2s)

  1. Traffic Configuration:
    • Set up application-level traffic between nodes to generate network activity, triggering the dynamic routing protocol.

Step 6: Run the Simulation

  1. Compile the Project:
    • Make sure everything is properly implemented and compiled.
  2. Run Simulations:
    • Implement the simulations using OMNeT++’s IDE or command line. Note the performance of the dynamic routing protocol, especially how it changes to network conditions in real-time.

Step 7: Analyze the Results

  1. Monitor Routing Adaptation: Calculate how rapidly, and efficiently the routing protocol adapts to changes in the network conditions.
  2. Evaluate Protocol Performance:
    • Evaluate key performance metrics like packet delivery ratio, route optimality, and network utilization.
    • Scalars and Vectors: To record and analyse scalar and vector data, such as the rate of route changes and the total network performance by using the OMNeT++ tools.
  3. Check for Issues:
    • To observe for issues like routing loops, oscillations, or instability, especially in quickly changing network conditions.

Step 8: Refine and Optimize the Protocol

  1. Address Any Bugs or Inefficiencies:
  • If the protocol shows problems, consider filtering the algorithms for link metric valuation or route calculation.
  1. Optimize for Performance:
    • Perfect parameters like update intervals or the decision-making method to increase network efficiency and stability.
  2. Re-Test:
    • Run the simulation again with the optimized protocol to evaluate developments.

Above details, we are learned to build an OMNeT++ projects, to implement dynamic routing logic in C++, and analysing the results. We will distribute further details about to implement Dynamic Routing in OMNeT++. We have implemented dynamic routing in the OMNeT++ tool; send us the details of your project, and we will provide you with the best simulation outcomes. You can get the best project performance support from omnet-manual.com.