How to Implement Traffic aware Routing in OMNeT++
To implement Traffic-Aware Routing in OMNeT++ has needs to designing a routing protocol that enthusiastically adjust to the current network traffic conditions to enhance path selection. The Traffic-aware routing can support to minimize congestion, diminishing latency, and optimizing the overall network performance. The below is the guide on how to implement Traffic-Aware Routing in OMNeT++:
Step-by-Step Implementation:
- Set up Your OMNeT++ Environment
- Make sure OMNeT++ and the INET framework are installed and configured properly.
- If the scenario contains the particular kinds of networks like wireless, IoT, ensure the any added required frameworks or modules are installed.
- Define the Network Topology
- Generate a NED file that describes the network topology that contains all connected network devices like routers, switches, and hosts.
Example NED file:
network TrafficAwareNetwork
{
submodules:
host1: StandardHost;
host2: StandardHost;
router1: Router;
router2: Router;
router3: Router;
connections:
host1.ethg++ <–> EthLink <–> router1.ethg++;
router1.ethg++ <–> EthLink <–> router2.ethg++;
router2.ethg++ <–> EthLink <–> router3.ethg++;
router3.ethg++ <–> EthLink <–> host2.ethg++;
router1.ethg++ <–> EthLink <–> router3.ethg++; // Alternative path
}
- Implement Traffic Monitoring
- Develop a module within the routers that observes the traffic load on each link. This could contain to monitor the parameters such as packet queue lengths, link utilization, or packet delay.
Example traffic monitoring module:
class TrafficMonitor : public cSimpleModule {
protected:
int packetCount = 0;
simtime_t lastUpdate;
virtual void initialize() override {
lastUpdate = simTime();
scheduleAt(simTime() + 1, new cMessage(“updateTraffic”));
}
virtual void handleMessage(cMessage *msg) override {
if (msg->isSelfMessage()) {
updateTrafficStats();
scheduleAt(simTime() + 1, msg);
} else {
packetCount++;
send(msg, “out”);
}
}
void updateTrafficStats() {
simtime_t timeInterval = simTime() – lastUpdate;
double throughput = packetCount / timeInterval.dbl(); // packets per second
EV << “Current throughput: ” << throughput << ” packets/second” << endl;
packetCount = 0;
lastUpdate = simTime();
}
};
Define_Module(TrafficMonitor);
- Implement the Traffic-Aware Routing Protocol
- Improve a routing protocol that makes routing decisions based on the traffic information gathered by the traffic monitors. The protocol should choose paths that are less congested to enhance the network performance.
Example traffic-aware routing logic:
class TrafficAwareRouter : public cSimpleModule {
protected:
virtual void initialize() override {
// Initialization code
}
virtual void handleMessage(cMessage *msg) override {
if (Packet *pkt = dynamic_cast<Packet*>(msg)) {
chooseBestRoute(pkt);
} else {
delete msg;
}
}
void chooseBestRoute(Packet *pkt) {
int leastCongestedGateIndex = findLeastCongestedGate();
EV << “Routing packet through gate ” << leastCongestedGateIndex << endl;
send(pkt, “out”, leastCongestedGateIndex);
}
int findLeastCongestedGate() {
int bestGate = -1;
double minThroughput = DBL_MAX;
for (int i = 0; i < gateSize(“out”); i++) {
TrafficMonitor *monitor = check_and_cast<TrafficMonitor*>(gate(“out”, i)->getNextGate()->getOwnerModule());
double throughput = monitor->getThroughput(); // Hypothetical method to get current throughput
if (throughput < minThroughput) {
minThroughput = throughput;
bestGate = i;
}
}
return bestGate;
}
};
Define_Module(TrafficAwareRouter);
Note: we would require to execute the method getThroughput() in the TrafficMonitor class to return the current throughput for this example to work.
- Simulate and Monitor Network Performance
- Execute the simulation to monitor how the traffic-aware routing protocol performs under numerous traffic conditions. Key metrics to monitor include:
- Packet Delivery Ratio: The percentage of packets successfully delivered.
- Average Latency: The average time taken for packets to reach their destination.
- Network Congestion: The level of congestion on numerous network paths.
Example .ini file configuration:
network = TrafficAwareNetwork
sim-time-limit = 300s
**.router*.app[0].typename = “TrafficAwareRouter”
**.router*.monitor.typename = “TrafficMonitor”
**.host*.app[0].typename = “UdpBasicApp”
**.host*.app[0].destAddresses = “host2”
**.host*.app[0].messageLength = 1000B
**.host*.app[0].sendInterval = uniform(1, 5)
- Analyse and Optimize
- After running the simulation, evaluate the recorded information to assess the efficiency of traffic-aware routing protocol. we can use OMNeT++’s built-in analysis tools or export the information for further analysis in tools such as Python or MATLAB.
Example Python script for analyzing latency:
import pandas as pd
import matplotlib.pyplot as plt
data = pd.read_csv(‘results/scalars.csv’)
latencies = data[data[‘name’].str.contains(‘endToEndDelay’)][‘value’]
plt.hist(latencies, bins=50)
plt.xlabel(‘End-to-End Delay (s)’)
plt.ylabel(‘Frequency’)
plt.title(‘End-to-End Delay Distribution’)
plt.show()
- Based on the analysis, improve the routing logic to added enhanced performance. For instance, we could familiarize the dynamic thresholds for congestion or experiment with numerous traffic metrics such as delay or jitter.
- Implement Advanced Features
- Multi-Criteria Decision Making: To deliberate multiple factors like latency, jitter, packet loss when making routing decisions.
- Adaptive Routing: To apply the routing that adjusts in real-time to varying traffic patterns.
- Machine Learning Integration: Use machine learning to forecast congestion and adapt the routing decisions proactively.
Additional Considerations:
- Scalability: Make sure that traffic-aware routing protocol can scale to large networks with numerous nodes.
- Real-Time Adaptation: Deliberate the time required to collect traffic data and make routing decisions particularly in networks with high traffic volatility.
- Interoperability: Make sure that the traffic-aware routing protocol can operates together with existing network protocols and standards.
In this setup, we can get knowledge on how to execute the traffic aware routing in OMNeT++ tool that effectively optimize the path selection. We also deliver the numerous kinds of information about traffic aware routing. We work on traffic-aware routing in OMNeT++ tool projects and provide you with the best results. Receive implementation assistance from us.