How to Implement Hierarchical Topology in OMNeT++
To implement the hierarchical topology in OMNeT++ has essential to encompass making a network that is structured in layers, with nodes are ordered into groups that are connected by higher-level nodes like routers or switches. It is frequently used in large networks, like enterprise networks, where various layers manage several functions like access, distribution, and core layers.
The following steps is useful for implement a hierarchical topology in OMNeT++ using the INET framework:
Step-by-Step Implementations:
- Set up OMNeT++ and INET Framework
- Make sure that OMNeT++ and the INET framework are installed and correctly configured. The INET framework delivers the needed modules for mimicking numerous network topologies, containing hierarchical networks.
- Define the Hierarchical Topology in a NED File
- Make a .ned file to define the network topology. Nodes are grouped into layers, and every layer is connected by higher-level nodes in a hierarchical topology,.
Example:
package hierarchicalTopologyExample;
import inet.node.inet.StandardHost;
import inet.node.inet.Router;
network HierarchicalTopology
{
parameters:
int numAccessNodes = default(3); // Number of nodes in the access layer
int numDistributionNodes = default(2); // Number of distribution nodes
submodules:
coreRouter: Router {
parameters:
@display(“p=400,100”);
}
distribution[numDistributionNodes]: Router {
parameters:
@display(“p=200+400*i,200”);
}
access[numDistributionNodes][numAccessNodes]: StandardHost {
parameters:
@display(“p=100+200*j+400*i,300”);
}
connections allowunconnected:
// Connect the core router to the distribution layer
for i=0..numDistributionNodes-1 {
coreRouter.ethg++ <–> Eth10G <–> distribution[i].ethg++;
}
// Connect each distribution router to its access layer nodes
for i=0..numDistributionNodes-1 {
for j=0..numAccessNodes-1 {
distribution[i].ethg++ <–> Eth10G <–> access[i][j].ethg++;
}
}
}
- In this example:
- The core and distribution nodes used by Router.
- StandardHost denotes the separate nodes in the access layer.
- The Eth10G connections are used to link the core router to the distribution routers and the distribution routers to the access nodes.
- Configure the Nodes in OMNeT++ INI File
- Configure the properties of the nodes, like IP addresses, routing protocols, and the applications they will run in the omnetpp.ini file.
Example:
[General]
network = hierarchicalTopologyExample.HierarchicalTopology
# Configure IP addresses and routing
*.coreRouter.ipv4.arp.typename = “GlobalArp”
*.distribution[*].ipv4.arp.typename = “GlobalArp”
*.access[*][*].ipv4.arp.typename = “GlobalArp”
*.access[*][*].ppp[0].ipv4.address = “10.0.0.x”
*.access[*][*].ppp[0].ipv4.netmask = “255.255.255.0”
# Example application setup: an access node in one group sends data to an access node in another group
*.access[0][0].numApps = 1
*.access[0][0].app[0].typename = “UdpBasicApp”
*.access[0][0].app[0].destAddresses = “10.0.0.6” # IP address of access[1][0]
*.access[0][0].app[0].destPort = 5000
*.access[0][0].app[0].messageLength = 1024B
*.access[0][0].app[0].sendInterval = 1s
*.access[1][0].numApps = 1
*.access[1][0].app[0].typename = “UdpSink”
*.access[1][0].app[0].localPort = 5000
- In this example:
- access[0][0], which belongs to one access layer group, is configured to send UDP packets to access[1][0], which belongs to another group.
- To receive and process the packets configured by access[1][0].
- Configure Routing Protocols
- We might essential to configure routing protocols to manage how data is forwarded through the network depends on the complexity of the hierarchical topology. For example, we can enable OSPF (Open Shortest Path First) or other suitable protocol.
Example:
*.coreRouter.hasOspf = true
*.distribution[*].hasOspf = true
*.access[*][*].hasOspf = true
- This configuration permits OSPF on all routers and nodes, allowing dynamic routing across the hierarchical network.
- Run the Simulation
- Compile and run the simulation in OMNeT++ after setting up the network topology and configuration. We should see the core router connecting numerous distribution routers, which in turn link to their corresponding access nodes.
- Analyse the Results
- To visualize and analyse the network traffic by using OMNeT++’s built-in tools. Observe how data flows among the various layers, how the core router handles the traffic, and the overall performance of the hierarchical topology.
- Enhancements and Variations
- Traffic Analysis: Calculate the performance of the network in terms of throughput, latency, and load balancing under numerous traffic conditions.
- Fault Tolerance: Mimic the failure of one or more links or nodes and watch how the network reroutes traffic and maintains connectivity.
- Scalability: Experimenting with adding many nodes or layers to see how the hierarchical topology scales with rising network size.
Example Files
- HierarchicalTopology.ned: Describes the hierarchical topology.
- omnetpp.ini: Encompasses configuration settings for the simulation.
Above details are given step-by-step process is helps to know how to implement the Hierarchical topology using INET framework in OMNeT++. We are provide more informations about this topology using other tools in future. Our developers at omnet-manual.com for assistance with implementing and simulating Hierarchical Topology in the OMNeT++ tool. We’re here to help you with comparison analysis and project execution ideas—just send us a message!