To implement network controller placement in ns3, by simulating a Software Defined Network (SDN). In which that network performance has been optimized by placing the controllers strategically. For managing the flow in the network we can set-up the controllers, switches, and hosts, and configuring the network to use the controllers. Below given steps will guide on how to implement network controller placement in ns3:
Step-by-step guide to implement network controller placement in ns3:
Step 1: Setup ns3 Environment
Make sure ns3 is installed and set up on the system.
Step 2: Include Necessary Modules
Include the necessary ns3 modules in the script:
#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”
#include “ns3/openflow-module.h”
Step 3: Create the Simulation Script
- Setup Nodes and Network:
using namespace ns3;
NS_LOG_COMPONENT_DEFINE (“ControllerPlacement”);
int main (int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse (argc, argv);
// Create nodes
NodeContainer hosts;
hosts.Create (4);
NodeContainer switches;
switches.Create (2);
NodeContainer controllers;
controllers.Create (2);
// Create point-to-point links
PointToPointHelper pointToPoint;
pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“1Gbps”));
pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));
NetDeviceContainer hostDevices;
NetDeviceContainer switchDevices;
NetDeviceContainer controllerDevices;
// Connect hosts to switches
hostDevices.Add (pointToPoint.Install (hosts.Get (0), switches.Get (0)));
hostDevices.Add (pointToPoint.Install (hosts.Get (1), switches.Get (0)));
hostDevices.Add (pointToPoint.Install (hosts.Get (2), switches.Get (1)));
hostDevices.Add (pointToPoint.Install (hosts.Get (3), switches.Get (1)));
// Connect switches to each other
switchDevices.Add (pointToPoint.Install (switches.Get (0), switches.Get (1)));
// Install OpenFlow on the switches
OpenFlowSwitchHelper ofSwitchHelper;
Ptr<Node> switchNode0 = switches.Get (0);
Ptr<Node> switchNode1 = switches.Get (1);
Ptr<ofi::OpenFlowSwitchNetDevice>ofSwitchDev0 = CreateObject<ofi::OpenFlowSwitchNetDevice> ();
Ptr<ofi::OpenFlowSwitchNetDevice>ofSwitchDev1 = CreateObject<ofi::OpenFlowSwitchNetDevice> ();
switchNode0->AddDevice (ofSwitchDev0);
switchNode1->AddDevice (ofSwitchDev1);
// Add switch ports
for (uint32_t i = 0; i < switchNode0->GetNDevices (); ++i)
{
Ptr<NetDevice> netDevice = switchNode0->GetDevice (i);
if (DynamicCast<PointToPointNetDevice> (netDevice))
{
ofSwitchDev0->AddSwitchPort (netDevice);
}
}
for (uint32_t i = 0; i < switchNode1->GetNDevices (); ++i)
{
Ptr<NetDevice> netDevice = switchNode1->GetDevice (i);
if (DynamicCast<PointToPointNetDevice> (netDevice))
{
ofSwitchDev1->AddSwitchPort (netDevice);
}
}
// Install OpenFlow controllers
Ptr<ofi::LearningController> controller0 = CreateObject<ofi::LearningController> ();
Ptr<ofi::LearningController> controller1 = CreateObject<ofi::LearningController> ();
ofSwitchHelper.InstallController (controllers.Get (0), controller0);
ofSwitchHelper.InstallController (controllers.Get (1), controller1);
// Assign IP addresses
InternetStackHelper internet;
internet.Install (hosts);
internet.Install (controllers);
Ipv4AddressHelper address;
address.SetBase (“10.1.1.0”, “255.255.255.0”);
address.Assign (hostDevices);
address.Assign (switchDevices);
// Set up applications
UdpEchoServerHelper echoServer (9);
ApplicationContainer serverApps = echoServer.Install (hosts.Get (3));
serverApps.Start (Seconds (1.0));
serverApps.Stop (Seconds (20.0));
UdpEchoClientHelper echoClient (Ipv4Address (“10.1.1.4”), 9);
echoClient.SetAttribute (“MaxPackets”, UintegerValue (1000));
echoClient.SetAttribute (“Interval”, TimeValue (Seconds (0.1)));
echoClient.SetAttribute (“PacketSize”, UintegerValue (1024));
ApplicationContainer clientApps = echoClient.Install (hosts.Get (0));
clientApps.Start (Seconds (2.0));
clientApps.Stop (Seconds (20.0));
Simulator::Stop (Seconds (20.0));
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
Run the Simulation: Compile and run your simulation script:
./waf configure
./waf build
./waf –run ControllerPlacement
Explanation:
- Node Creation: Create nodes representing hosts, switches, and controllers.
- Point-to-Point Links: Configure point-to-point links between nodes.
- OpenFlow Switch: Set up OpenFlow switches and connect them to the network.
- OpenFlow Controllers: Install controllers and assign them to the switches.
- IP Configuration: Assign IP addresses to the hosts and switches.
- Applications: Use UDP Echo server and client applications to simulate data transmission.
Step 4: Advanced Controller Placement Techniques
- Optimized Controller Placement: Implement logic to dynamically place controllers based on network conditions such as latency, load, or failure conditions. This can involve additional scripting to dynamically assign controllers to switches.
- Monitoring and Adaptation: Implement monitoring to adaptively manage controller placement. Use flow monitor and other ns3 tools to gather network performance metrics.
// Flow monitor
FlowMonitorHelper flowmon;
Ptr<FlowMonitor> monitor = flowmon.InstallAll ();
// After simulation run
monitor->SerializeToXmlFile (“flowmon-results.xml”, true, true);
Custom Controller Logic: Extend the LearningController class to implement custom controller logic based on your specific needs.
class CustomController : public ofi::LearningController
{
public:
static TypeId GetTypeId (void);
CustomController ();
virtual void ReceiveFromSwitch (Ptr<ofi::Switch> swtch, ofpbuf *buffer);
};
TypeId CustomController::GetTypeId (void)
{
static TypeId tid = TypeId (“CustomController”)
.SetParent<ofi::LearningController> ()
.AddConstructor<CustomController> ();
return tid;
}
CustomController::CustomController ()
{
}
void CustomController::ReceiveFromSwitch (Ptr<ofi::Switch> swtch, ofpbuf *buffer)
{
// Custom logic here
LearningController::ReceiveFromSwitch (swtch, buffer);
}
Multi-Domain SDN: Simulate multi-domain SDN by setting up multiple controllers and managing inter-domain communication.
Over all, from the above steps and example we get to know the implementation of network controller placement in ns3 by using the software defined network environment that strategically place the controllers to enhance the network performance.
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