How to Implement Physical Topology in OMNeT++
To implement a physical topology in OMNeT++ has needs to describe the actual layout and connections among nodes in a network. The term physical topology denotes the real world organization of nodes and how it interconnected in the star, ring, bus, or mesh configurations. Here, we provide brief procedures on how to simulate the physical topology in OMNeT++ using the INET framework:
Step-by-Step Implementation:
- Set up OMNeT++ and INET Framework
- Make sure that OMNeT++ and the INET framework are installed and configured correctly. The INET framework offers the essential modules for emulate numerous network topologies that contain various physical configurations.
- Define the Physical Topology in a NED File
- The NED file describes the network structure that particularly how nodes are physically connected. Below are samples of several physical topologies.
Example 1: Star Topology
package physicalTopologyExample;
import inet.node.inet.StandardHost;
import inet.node.inet.Router;
network StarTopology
{
parameters:
int numNodes = default(5); // Number of nodes in the star topology
submodules:
centralNode: Router {
parameters:
@display(“p=400,300”);
}
node[numNodes]: StandardHost {
parameters: @display(“p=200+400*cos(pi/2+i*2*pi/numNodes),300+300*sin(pi/2+i*2*pi/numNodes)”);
}
connections allowunconnected:
// Connect each node to the central node
for i=0..numNodes-1 {
node[i].ethg++ <–> Eth10G <–> centralNode.ethg++;
}
}
- Star Topology: Each node (StandardHost) connects to a central node (Router), representing a hub or switch.
Example 2: Ring Topology
package physicalTopologyExample;
import inet.node.inet.StandardHost;
network RingTopology
{
parameters:
int numNodes = default(5); // Number of nodes in the ring topology
submodules:
node[numNodes]: StandardHost {
parameters:
@display(“p=200+300*cos(pi/2+i*2*pi/numNodes),300+300*sin(pi/2+i*2*pi/numNodes)”);
}
connections allowunconnected:
// Connect each node to the next in a ring
for i=0..numNodes-2 {
node[i].ethg++ <–> Eth10G <–> node[i+1].ethg++;
}
node[numNodes-1].ethg++ <–> Eth10G <–> node[0].ethg++; // Complete the ring
}
- Ring Topology: Each node is connected to two other nodes, forming a loop.
Example 3: Mesh Topology
package physicalTopologyExample;
import inet.node.inet.StandardHost;
network MeshTopology
{
parameters:
int numNodes = default(4); // Number of nodes in the mesh topology
submodules:
node[numNodes]: StandardHost {
parameters: @display(“p=200+300*cos(pi/2+i*2*pi/numNodes),300+300*sin(pi/2+i*2*pi/numNodes)”);
}
connections allowunconnected:
// Fully connect all nodes in the mesh
for i=0..numNodes-2 {
for j=i+1..numNodes-1 {
node[i].ethg++ <–> Eth10G <–> node[j].ethg++;
}
}
}
- Mesh Topology: Every node is connected to every other node, forming a fully connected mesh.
- Configure the Nodes in OMNeT++ INI File
- In the omnetpp.ini file, configure the properties of the nodes like IP addresses, routing, and the applications they will run.
Example:
network = physicalTopologyExample.StarTopology # or RingTopology, MeshTopology
# 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 communicates with node 3
*.node[0].numApps = 1
*.node[0].app[0].typename = “UdpBasicApp”
*.node[0].app[0].destAddresses = “10.0.0.4” # IP address of node[3]
*.node[0].app[0].destPort = 5000
*.node[0].app[0].messageLength = 1024B
*.node[0].app[0].sendInterval = 1s
*.node[3].numApps = 1
*.node[3].app[0].typename = “UdpSink”
*.node[3].app[0].localPort = 5000
- In this example:
- The nodes are configured with IP addresses and set up to send and receive information then emulate network traffic.
- Run the Simulation
- After setting up the network topology and configuration compile and run the simulation in OMNeT++. We should see the nodes that communicate based on the identified physical topology.
- Analyze the Results
- Use OMNeT++’s built-in tools to visualize and assess the network traffic and investigate how data is transmitted across the network that considers the factors such as latency, throughput, and packet loss.
- Enhancements and Variations
- Hybrid Topologies: Syndicate diverse physical topologies to generate more complex network designs.
- Failure Scenarios: Simulate node or link failures and study how the network topology affects resilience and fault tolerance.
- Traffic Analysis: Experiment with several traffic patterns and examine how the topology impacts network performance under numerous loads.
Example Files
- StarTopology.ned, RingTopology.ned, MeshTopology.ned: Describes the altered physical topologies.
- omnetpp.ini: Contains configuration settings for the simulation.
Overall, we clearly demonstrate how the physical topology will implemented using the OMNeT++ tool that has creates the network then configure the simulation and assess the network traffic across the network.
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