How to Implement Bus Topology in OMNeT++
To implement a bus topology in OMNeT++ has needs to include mimicking a network where all nodes are connected to a single communication line or bus. This topology, any node sent data is received by all other nodes on the bus, but only the intended recipient procedures the data.
Step-by-Step Implementations:
Steps to Implement Bus Topology in OMNeT++
- Set up OMNeT++ and INET Framework
- Make sure that OMNeT++ and the INET framework are installed and correctly configured. The INET framework offers the required modules for simulating several network topologies and protocols.
- Define the Bus Topology in a NED File
- Generate a .ned file to define the network topology. In a bus topology, all nodes are connected to a single communication channel (the bus).
Example:
package busTopologyExample;
import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;
import inet.node.inet.StandardHost;
import inet.linklayer.ethernet.EthernetBus;
network BusTopology
{
parameters:
int numNodes = default(5); // Number of nodes in the bus topology
submodules:
configurator: Ipv4NetworkConfigurator {
parameters:
@display(“p=100,100”);
}
bus: EthernetBus {
parameters:
@display(“p=400,300”);
}
node[numNodes]: StandardHost {
parameters:
@display(“p=400+100*i,300”);
}
connections allowunconnected:
for i=0..numNodes-1 {
node[i].ethg++ <–> bus.port++;
}
}
- In this example:
- EthernetBus is used to denote the bus to which all nodes are connected.
- StandardHost is used to represent each node like client or server.
- The bus.port++ automatically connects each node to the next obtainable port on the bus.
- Configure the Nodes and Bus in OMNeT++ INI File
- In the omnetpp.ini file, configure the properties of the nodes and the bus. We can denote IP addresses, applications running on the nodes, and other related parameters.
Example:
[General]
network = busTopologyExample.BusTopology
*.configurator.config = xmldoc(“IPv4Config.xml”)
# Configure node IP addresses (if not using automatic assignment)
*.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].numApps = 1
*.node[0].app[0].typename = “UdpBasicApp”
*.node[0].app[0].destAddresses = “10.0.0.2”
*.node[0].app[0].destPort = 5000
*.node[0].app[0].messageLength = 1024B
*.node[0].app[0].sendInterval = 1s
*.node[1].numApps = 1
*.node[1].app[0].typename = “UdpSink”
*.node[1].app[0].localPort = 5000
- In this example:
- The node[0] sends UDP packets to node[1] by using the UdpBasicApp and UdpSink applications.
- The IPv4Config.xml file (not shown here) is used to configure IP addresses automatically or manually.
- Run the Simulation
- To compile and run the simulation in OMNeT++ after setting up the network topology and configuration. We should see all nodes connected to a unique bus, with data being sent across the bus from one node to other.
- Analyse the Results
- To visualize and analyse the network traffic by using OMNeT++’s built-in tools. We can observe how data flows through the bus and how each node takes and processes the data.
- Enhancements and Variations
- Collision Handling: Collisions might occur when two nodes send data simultaneously in a real-world bus topology. Mimic collision detection and handling mechanisms like CSMA/CD used in Ethernet.
- Dynamic Topology: Test with adding and removing nodes enthusiastically to see how the bus topology handles changes.
- Performance Analysis: Evaluate the performance of the network in terms of throughput, latency, and collision rate under changing loads.
Example Files
- BusTopology.ned: Describes the bus topology.
- omnetpp.ini: Includes configuration settings for the simulation.
Important Considerations
- Scalability: Bus topologies cannot scale well as the number of nodes improves, which can be simulated to learn network performance under various loads.
- Realism: Though simulating bus topology in OMNeT++, make sure that the physical constraints and limitations of real-world bus networks like signal degradation and collision domains are considered.
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