How to Start Benes Network Routing Projects Using NS3

To start a Benes Network Routing project in NS3, we follow these steps:

Steps to Start Benes Network Routing Project in NS3

1. Understand Benes Network Routing

• Benes Network:
  • A Benes network is a kind of multistage interconnection network (MIN) that frequently utilised within parallel computing, telecommunication switching, and data center networks.
  • It contains logarithmic depth and assists any permutation of inputs to outputs to utilize rearrangeable connections.
• Applications:
  • Data center routing.
  • High-performance computing networks.
  • Optimization studies within switching and routing.

2. Set Up NS3

1. Install NS3:

sudo apt update

sudo apt install g++ python3 git cmake

git clone https://gitlab.com/nsnam/ns-3-dev.git

cd ns-3-dev

./waf configure

./waf build

1. Verify Installation:

./waf –run scratch/my-first

3. Plan a Benes Network in NS3

1. Define the Benes Topology:
   • A Benes network encompasses input, middle, and output stages including the crossbar switches.
   • Connections are depends on the permutation routing logic.
2. Implement Routing:
   • According to the destination address and stage logic, we can send packets via the network.

4. Create the Benes Network Topology

Here’s an example for making a basic 3-stage Benes network including 8 inputs and 8 outputs.

Example Code:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/point-to-point-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

int main() {

// Define the number of inputs/outputs

uint32_t numNodes = 8;

// Create nodes for input, middle, and output stages

NodeContainer inputNodes, middleNodes, outputNodes;

inputNodes.Create(numNodes);

middleNodes.Create(numNodes);

outputNodes.Create(numNodes);

// Create Point-to-Point links

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute(“DataRate”, StringValue(“10Gbps”));

pointToPoint.SetChannelAttribute(“Delay”, StringValue(“2ms”));

// Connect input to middle stage

NetDeviceContainer devicesInputToMiddle[numNodes];

for (uint32_t i = 0; i < numNodes; ++i) {

devicesInputToMiddle[i] = pointToPoint.Install(inputNodes.Get(i), middleNodes.Get(i));

}

// Connect middle to output stage

NetDeviceContainer devicesMiddleToOutput[numNodes];

for (uint32_t i = 0; i < numNodes; ++i) {

devicesMiddleToOutput[i] = pointToPoint.Install(middleNodes.Get(i), outputNodes.Get(i));

}

// Install Internet stack

InternetStackHelper internet;

internet.Install(inputNodes);

internet.Install(middleNodes);

internet.Install(outputNodes);

// Assign IP addresses

Ipv4AddressHelper ipv4;

for (uint32_t i = 0; i < numNodes; ++i) {

ipv4.SetBase(“10.1.” + std::to_string(i) + “.0”, “255.255.255.0”);

ipv4.Assign(devicesInputToMiddle[i]);

ipv4.Assign(devicesMiddleToOutput[i]);

}

// Add applications

uint16_t port = 9;

UdpEchoServerHelper echoServer(port);

ApplicationContainer serverApps = echoServer.Install(outputNodes.Get(7)); // Output node 7

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(10.0));

UdpEchoClientHelper echoClient(Ipv4Address(“10.1.7.2”), port); // Target output node 7

echoClient.SetAttribute(“MaxPackets”, UintegerValue(1));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(1.0)));

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer clientApps = echoClient.Install(inputNodes.Get(0)); // Source input node 0

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(10.0));

Simulator::Run();

Simulator::Destroy();

return 0;

}

5. Implement Routing Logic

Benes networks needs certain routing logic, permuting packets among the input and output.

Steps:

1. Define Routing Tables:
   • Depends on the Benes permutation logic to utilize a static or dynamic routing table.
2. Implement Permutation Logic:
   • Dynamically connect input to output ports to utilize a predefined permutation function.

Example Routing Logic:

void RouteThroughBenes(NodeContainer &inputNodes, NodeContainer &middleNodes, NodeContainer &outputNodes) {

for (uint32_t i = 0; i < inputNodes.GetN(); ++i) {

Ptr<Ipv4StaticRouting> staticRouting = CreateObject<Ipv4StaticRouting>();

// Example: Map input node i to output node (i+1) % N

staticRouting->AddHostRouteTo(Ipv4Address(“10.1.” + std::to_string((i + 1) % 8) + “.1”),

Ipv4Address(“10.1.” + std::to_string(i) + “.1”), 1);

}

}

6. Simulate Traffic

Make traffic among particular inputs and outputs to experiment the behaviour of routing.

Example Traffic:

• For simple testing utilising UdpEchoClient and UdpEchoServer.
• Make use of OnOffApplication for continuous packet generation.

7. Testing and Debugging

1. Enable Logging:

NS_LOG=”BenesRouting” ./waf –run benes-routing

1. Verify Packet Flow:
   • Allow .pcap tracing for packet-level analysis:

pointToPoint.EnablePcapAll(“benes-routing”);

1. Inspect Routing Tables:
   • Analyse the routing tables, confirming the Benes permutation logic.

Through given approach, we grasped the concepts and process to replicate and analyse the Benes Network Routing Projects utilising NS3 platform. We are furnished to expand this details further, depends on your requirements.

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