How to Implement Line Topology in OMNeT++
To implement a line topology in OMNeT++ needs a network in which their nodes are connected to precisely two other nodes except that the nodes at the end of the line that is connected to only one other node by creating one. This topology is straightforward and is commonly used in small networks or for chaining devices together.
Below, we give the steps to implement a line topology in OMNeT++ using the INET framework:
Step-by-Step Implementation:
- Set Up OMNeT++ and INET Framework
- Make certain OMNeT and INET framework is properly installed and configured. Simulate different network topologies like line network using essential modules that is provided by the INET framework.
- Define the Line Topology in a NED File
- Describe the Line topology by generating .ned file. In a line topology, every node is linked to its immediate neighbor(s) in a linear fashion.
Example:
package lineTopologyExample;
import inet.node.inet.StandardHost;
import inet.linklayer.ppp.Ppp;
network LineTopology
{
parameters:
int numNodes = default(5); // Number of nodes in the line topology
submodules:
node[numNodes]: StandardHost {
parameters:
@display(“p=200+200*i,200”);
}
connections allowunconnected:
// Connect each node to its neighbor to form a line
for i=0..numNodes-2 {
node[i].pppg++ <–> Ppp <–> node[i+1].pppg++;
}
}
- In this sample:
- Use StandardHost to signify each node in the network.
- Use Ppp (Point-to-Point Protocol) connections to directly connect neighboring nodes.
- For visual clarity, the nodes are located in a horizontal line.
- Configure the Nodes in OMNeT++ INI File
- In the omnetpp.ini file, configure the properties of the nodes like IP addresses and the applications they will run.
Example:
network = lineTopologyExample.LineTopology
# Configure IP addresses
*.node[*].ipv4.arp.typename = “GlobalArp”
*.node[*].ppp[0].ipv4.address = “10.0.0.x”
*.node[*].ppp[0].ipv4.netmask = “255.255.255.0”
# Example application setup: node 0 sends data to node 4 through the line
*.node[0].numApps = 1
*.node[0].app[0].typename = “UdpBasicApp”
*.node[0].app[0].destAddresses = “10.0.0.5” # IP address of node[4]
*.node[0].app[0].destPort = 5000
*.node[0].app[0].messageLength = 1024B
*.node[0].app[0].sendInterval = 1s
*.node[4].numApps = 1
*.node[4].app[0].typename = “UdpSink”
*.node[4].app[0].localPort = 5000
- In this instance:
- node[0] is configured to send UDP packets to node[4], which is at the opposite end of the line.
- node[4] is configured to receive and process the packets.
- Run the Simulation
- After setting up the network topology and configuration, compile and run the simulation in OMNeT++. In linear sequence, we could see every nodes with data flowing from one end of the line to the other.
- Analyze the Results
- Use OMNeT++’s built-in tools to visualize and analyze the network traffic. Examine how data is transferred through the line, the latency involved in reaching the last node, and how the network manages traffic.
- Enhancements and Variations
- Bidirectional Communication: Build bidirectional communication where nodes can send and receive data from both their neighbors.
- Performance Analysis: Evaluate the performance of the network based on throughput, latency, and packet loss under various traffic conditions.
- Fault Tolerance: Simulate a scenario where one of the nodes or links fails and monitor how the network acts, specially based on its data delivery.
Example Files
- LineTopology.ned: Describes the line topology.
- omnetpp.ini: Has configuration settings for the simulation.
With the help of this demonstration, you get the valuable information regarding the line topology implementation with its installation process in the OMNeT++. We will guide you about topic through another procedure. As we continuously monitor the latest developments in line Topology within the OMNeT++ tool, ensuring that you receive the most relevant project topics. Rely on us for high-quality simulation ideas and outcomes