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How to Implement Dual Ring Topology in OMNeT++

To implement the Dual Ring topology in OMNeT++ needs a network in which their nodes should be linked to two rings such as offering redundancy and increased fault tolerance. If one ring fails, the other can endure to carry traffic which is especially helpful in situations that needs high availability. We offered the step-by-step process to implement this ring topology in the following below:

Step-by-Step Implementation:

  1. Set Up OMNeT++ and INET Framework
  • Make sure to install both OMNeT++ and the INET framework and verify it is properly configured. Simulate different network topologies like ring topologies, we can use the essential modules which are provided by INET.
  1. Define the Dual Ring Topology in a NED File
  • State the network topology by generating a .ned file. In a Dual Ring topology, every node connects to two distinct rings: an inner ring and an outer ring.

Example:

package dualRingTopologyExample;

import inet.node.inet.StandardHost;

import inet.linklayer.ethernet.EthernetInterface;

network DualRingTopology

{

parameters:

int numNodes = default(6);  // Number of nodes in the dual ring topology

submodules:

node[numNodes]: StandardHost {

parameters:

@display(“p=200+200*cos(pi/2+i*2*pi/numNodes),200+200*sin(pi/2+i*2*pi/numNodes)”);

numEthInterfaces = 2;  // Each node has two Ethernet interfaces

gates:

ethg[2];  // Two Ethernet gates for dual ring connectivity

}

connections allowunconnected:

// Connect each node in the inner ring (first ring)

for i=0..numNodes-2 {

node[i].ethg[0] <–> EtherChannel <–> node[i+1].ethg[0];

}

node[numNodes-1].ethg[0] <–> EtherChannel <–> node[0].ethg[0];  // Complete the inner ring

// Connect each node in the outer ring (second ring)

for i=0..numNodes-2 {

node[i].ethg[1] <–> EtherChannel <–> node[i+1].ethg[1];

}

node[numNodes-1].ethg[1] <–> EtherChannel <–> node[0].ethg[1];  // Complete the outer ring

}

  • EtherChannel: Signifies the Ethernet connection amongst nodes. All node has two interfaces to connect to both the inner and outer rings.
  1. Implement Redundancy and Fault Tolerance Mechanisms
  • Custom Protocol Implementation: To detect failures in one ring and deflect traffic via others by executing mechanisms to fully leverage the dual ring’s fault tolerance, implement mechanisms to detect failures in one ring and reroute traffic via other. This might contain custom modules or expanding existing ones.
  • Key Features:
    • Failure Detection: Nodes should detect if a link in one ring fails.
    • Automatic Switchover: When the failure is detected, traffic should autonomously redirect it to the operational ring.
  1. Configure the Nodes in OMNeT++ INI File
  • In the omnetpp.ini file, configure the properties of the nodes, including IP addresses, routing, and the applications they will run.

Example:

network = dualRingTopologyExample.DualRingTopology

# Configure IP addresses for inner and outer rings

*.node[*].ethg[0].ipv4.address = “10.0.1.x”  # Inner ring

*.node[*].ethg[1].ipv4.address = “10.0.2.x”  # Outer ring

*.node[*].ethg[0].ipv4.netmask = “255.255.255.0”

*.node[*].ethg[1].ipv4.netmask = “255.255.255.0”

# Example application setup: node 0 communicates with node 3 via the dual ring

*.node[0].numApps = 1

*.node[0].app[0].typename = “UdpBasicApp”

*.node[0].app[0].destAddresses = “10.0.1.4”  # IP address of node[3] on the inner ring

*.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 sample:
    • node[0] is configured to send UDP packets to node[3] using the inner ring.
    • The IP addresses for the inner and outer rings are configured separately, permitting traffic to be directed via either ring.
  1. Run the Simulation
  • Compile and run the simulation in OMNeT++ once the network is properly build and configured. Observe how traffic flows through both rings, and examine the redundancy and fault tolerance by simulating a failure in one ring.
  1. Analyze the Results

            

  • Visualize and analyze the network traffic by using the in-built tool of OMNeT++. Monitor how traffic is redirected when a failure occurs in one ring and how the network continues to function.
  1. Enhancements and Variations
  • Failure Scenarios: Introduce different failure situations like link failure in one ring, and Monitor how the network manages the rerouting of traffic.
  • Load Balancing: Executing load balancing mechanisms to hand out traffic amongst the two rings for prime performance.
  • Ring Recovery: Once the failure is resolved, restore the normal operation by developing and examine ring recovery protocols.

Example Files

  1. DualRingTopology.ned: Defines the basic Dual Ring topology.
  2. omnetpp.ini: Has configuration settings for the simulation.

In this procedure, we can completely understand how to install and implement the Dual ring topology and how to reroute it when the ring fails using INET framework in the OMNeT++. For further requirements, we will guide you through another simulation process. omnet-manual.com provide comprehensive implementation and simulation support for all Dual Ring Topology within the OMNeT++ tool. Please feel free to reach out to us for further guidance on project ideas related to this topic.

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