How to Simulate Star Bus Hybrid Topology Using OMNeT++

To simulate a Star-Bus Hybrid Topology using OMNeT++, we want to integrate the features of both star topology in which the devices are associated to a central hub and bus topology in which multiple star networks are associated to a common bus. This hybrid topology is usually utilized for scalability, connecting star networks using a bus by the way of the backbone. Send all your research details to phdprime.com we will provide you customised guidance with detailed explanation.

Here is a procedure to simulate the Star-Bus Hybrid Topology using OMNeT++

Steps for Simulating Star-Bus Hybrid Topology in OMNeT++:

1. Install OMNeT++: Ensure OMNeT++ is installed on the system. we can download it from the official OMNeT++ website.
2. Create a New OMNeT++ Project: Open OMNeT++ and generate a new OMNeT++ project by choosing File → New → OMNeT++ Project. Name the project (e.g., StarBusHybridTopologySimulation).
3. Define the Network Topology in NED File: In the NED (Network Description) file, we will describe the star-bus hybrid topology by designing numerous star networks connected through a common bus channel.

Here is a sample NED file structure for replicating a Star-Bus Hybrid Topology:

package starbushybrid;

import inet.node.inet.StandardHost;

import inet.node.ethernet.EtherSwitch;

network StarBusHybridTopology

{

types:

// Define a bus channel with specific properties

channel BusLink extends ned.DatarateChannel {

delay = 10us;

datarate = 100Mbps;

}

// Define a star link with properties for connections within star networks

channel StarLink extends ned.DatarateChannel {

delay = 5us;

datarate = 1Gbps;

}

submodules:

// Main Bus Connecting Star Networks

bus: StandardHost;

// Star Network 1

hub1: EtherSwitch;

host1_1: StandardHost;

host1_2: StandardHost;

host1_3: StandardHost;

// Star Network 2

hub2: EtherSwitch;

host2_1: StandardHost;

host2_2: StandardHost;

host2_3: StandardHost;

// Star Network 3

hub3: EtherSwitch;

host3_1: StandardHost;

host3_2: StandardHost;

host3_3: StandardHost;

connections:

// Connect hubs of the star networks to the main bus

bus.ethg++ <–> BusLink <–> hub1.ethg++;

bus.ethg++ <–> BusLink <–> hub2.ethg++;

bus.ethg++ <–> BusLink <–> hub3.ethg++;

// Connect hosts in Star Network 1

hub1.ethg++ <–> StarLink <–> host1_1.ethg++;

hub1.ethg++ <–> StarLink <–> host1_2.ethg++;

hub1.ethg++ <–> StarLink <–> host1_3.ethg++;

// Connect hosts in Star Network 2

hub2.ethg++ <–> StarLink <–> host2_1.ethg++;

hub2.ethg++ <–> StarLink <–> host2_2.ethg++;

hub2.ethg++ <–> StarLink <–> host2_3.ethg++;

// Connect hosts in Star Network 3

hub3.ethg++ <–> StarLink <–> host3_1.ethg++;

hub3.ethg++ <–> StarLink <–> host3_2.ethg++;

hub3.ethg++ <–> StarLink <–> host3_3.ethg++;

}

Explanation of the NED File:

1. Bus Channel (BusLink):
   • The BusLink describes the bus associating to all the star hubs (central nodes of each star topology).
   • The datarate and latency of the bus can be set based on your requirements (such as 100Mbps with 10 microseconds delay).
2. Star Link (StarLink):
   • The StarLink describes the individual links among the central hub (EtherSwitch) and the hosts in each star topology. Usually, this link has higher bandwidth (e.g., 1Gbps) and lower delay (5 microseconds).
3. Bus Node:
   • The bus node is designed as a host, however it can be customized to perform as the main channel or bus via that the star topologies are associated.
4. Star Networks:
   • Each star network has one hub (EtherSwitch) linked to numerous hosts. For instance, hub1 connects host1_1, host1_2, and host1_3.
5. Connections:
   • Bus-to-Hub Connections: The hubs of each star topology (hub1, hub2, hub3) are associated to the main bus using the BusLink channel.
   • Hub-to-Host Connections: The hosts in each star topology are associated to their respective hub tthrough the StarLink channel.

4. Simulation Configuration in omnetpp.ini:

After describing the topology, set up the simulation parameters in the omnetpp.ini file. For example:

network = starbushybrid.StarBusHybridTopology

sim-time-limit = 100s

**.ethg.mtu = 1500B

**.ethg.datarate = 1Gbps

**.ethg.delay = 5us

5. Running the Simulation:

• After configuring the NED file and set up, compile the project in OMNeT++.
• We can replicate and measure the network performance using OMNeT++’s simulation tools. The evaluation can contain throughput, delay, packet loss, etc.

Extending the Model:

• Traffic Models: we can incorporate traffic generators such as TCP/IP applications or UDP traffic to replicate real-world network environment.
• Performance Metrics: Deliberate to adding performance monitoring to evaluate throughput, delay, and other significant parameters among nodes.

In this setup simulation, we all know and get knowledge about how the star-bus hybrid topology will perform in the network environment. We provide further elaborated details regarding this process in upcoming manual.