To implement VLAN Trunking protocol in ns3, we have to create a module which handles VLAN configurations and propagate this information across the network. To manage VLAN configurations and ensure consistency across the network in network switches, VTP is used. Here are the steps to implement VLAN Trunking protocol in ns3.
Step-by-step guide on implementing VTP in ns3
- Set up your ns3 :
- Make sure that ns3 is installed in the computer. If not, install it.
- Create a New Module for VTP:
- Go to the src directory in ns3 and create a new directory named vtp. Create subdirectories named model, helper, and examples, inside the src directory.
- Define the VTP protocol:
- Create .cc and .h files for the VTP protocol in the model directory. Define the vtpprotocol that simulates the behavior of VTP.
- Implement the VTP class:
- Implement the key components of VTP such as VTP advertisements, synchronization of VLAN configurations, and VTP messages. For the VTP messages and processes, create classes.
- Integrate the VTP with ns3 network system:
- Modify the NetDevice class or create a custom bridge device that can handle VTP logic. Register VTP as a protocol in ns3.
- Create simulation script:
- Set up a network topology.
- Install the Internet stack.
- Use the VTP helper to enable VTP.
- Set up applications and run the simulation.
Example Code Structure
Below is the example for the implementation of VTP in ns3.
Define VTP Protocol
// src/vtp/model/vtp-protocol.h
#ifndef VTP_PROTOCOL_H
#define VTP_PROTOCOL_H
#include “ns3/packet.h”
#include “ns3/net-device.h”
#include “ns3/timer.h”
#include <vector>
#include <map>
namespace ns3 {
class VtpProtocol : public Object
{
public:
static TypeId GetTypeId (void);
VtpProtocol ();
virtual ~VtpProtocol ();
void Install (Ptr<NetDevice> device);
void ReceiveVtpMessage (Ptr<Packet> packet, Ptr<NetDevice> device);
private:
void Start ();
void Stop ();
void SendVtpAdvertisement ();
void HandleVtpMessage (Ptr<Packet> packet, Ptr<NetDevice> device);
Ptr<NetDevice> m_device;
Timer m_timer;
std::map<uint16_t, std::string> m_vlans; // VLAN ID to VLAN name mapping
};
} // namespace ns3
#endif // VTP_PROTOCOL_H
Implement VTP Protocol
// src/vtp/model/vtp-protocol.cc
#include “vtp-protocol.h”
#include “ns3/log.h”
#include “ns3/simulator.h”
#include “ns3/packet.h”
namespace ns3 {
NS_LOG_COMPONENT_DEFINE (“VtpProtocol”);
NS_OBJECT_ENSURE_REGISTERED (VtpProtocol);
TypeId
VtpProtocol::GetTypeId (void)
{
static TypeId tid = TypeId (“ns3::VtpProtocol”)
.SetParent<Object> ()
.SetGroupName (“Network”)
.AddConstructor<VtpProtocol> ();
return tid;
}
VtpProtocol::VtpProtocol ()
{
NS_LOG_FUNCTION (this);
}
VtpProtocol::~VtpProtocol ()
{
NS_LOG_FUNCTION (this);
}
void
VtpProtocol::Install (Ptr<NetDevice> device)
{
NS_LOG_FUNCTION (this << device);
m_device = device;
Start ();
}
void
VtpProtocol::Start ()
{
NS_LOG_FUNCTION (this);
m_timer.SetFunction (&VtpProtocol::SendVtpAdvertisement, this);
m_timer.Schedule (Seconds (30.0));
}
void
VtpProtocol::Stop ()
{
NS_LOG_FUNCTION (this);
m_timer.Cancel ();
}
void
VtpProtocol::SendVtpAdvertisement ()
{
NS_LOG_FUNCTION (this);
// Create VTP advertisement packet
Ptr<Packet> packet = Create<Packet> ();
// Add VTP header and VLAN information
// …
// Send VTP advertisement on all ports
m_device->Send (packet, m_device->GetBroadcast (), 0x2004); // Example protocol number for VTP
m_timer.Schedule (Seconds (30.0));
}
void
VtpProtocol::ReceiveVtpMessage (Ptr<Packet> packet, Ptr<NetDevice> device)
{
NS_LOG_FUNCTION (this << packet << device);
HandleVtpMessage (packet, device);
}
void
VtpProtocol::HandleVtpMessage (Ptr<Packet> packet, Ptr<NetDevice> device)
{
NS_LOG_FUNCTION (this << packet << device);
// Process VTP message
// Update VLAN configurations based on received VTP messages
// …
}
} // namespace ns3
Helper Class
// src/vtp/helper/vtp-helper.h
#ifndef VTP_HELPER_H
#define VTP_HELPER_H
#include “ns3/net-device-container.h”
#include “ns3/object-factory.h”
#include “ns3/vtp-protocol.h”
namespace ns3 {
class VtpHelper
{
public:
VtpHelper ();
void Install (NodeContainer c) const;
void Install (Ptr<Node> node) const;
void Install (Ptr<NetDevice> device) const;
private:
ObjectFactory m_factory;
};
} // namespace ns3
#endif // VTP_HELPER_H
Implement Helper Class
// src/vtp/helper/vtp-helper.cc
#include “vtp-helper.h”
#include “ns3/vtp-protocol.h”
#include “ns3/node.h”
#include “ns3/ipv4.h”
namespace ns3 {
VtpHelper::VtpHelper ()
{
m_factory.SetTypeId (VtpProtocol::GetTypeId ());
}
void
VtpHelper::Install (NodeContainer c) const
{
for (NodeContainer::Iterator i = c.Begin (); i != c.End (); ++i)
{
Install (*i);
}
}
void
VtpHelper::Install (Ptr<Node> node) const
{
for (uint32_t i = 0; i < node->GetNDevices (); ++i)
{
Ptr<NetDevice> device = node->GetDevice (i);
Install (device);
}
}
void
VtpHelper::Install (Ptr<NetDevice> device) const
{
Ptr<VtpProtocol> protocol = m_factory.Create<VtpProtocol> ();
protocol->Install (device);
}
} // namespace ns3
Example Simulation Script
// examples/vtp-simulation.cc
#include “ns3/core-module.h”
#include “ns3/network-module.h”
#include “ns3/internet-module.h”
#include “ns3/bridge-module.h”
#include “ns3/point-to-point-module.h”
#include “ns3/applications-module.h”
#include “ns3/vtp-helper.h”
using namespace ns3;
NS_LOG_COMPONENT_DEFINE (“VtpSimulation”);
int main (int argc, char *argv[])
{
CommandLine cmd;
cmd.Parse (argc, argv);
// Create nodes
NodeContainer nodes;
nodes.Create (4);
// Create point-to-point links
PointToPointHelper p2p;
p2p.SetDeviceAttribute (“DataRate”, StringValue (“1Gbps”));
p2p.SetChannelAttribute (“Delay”, StringValue (“2ms”));
NetDeviceContainer devices[4][4];
for (int i = 0; i < 4; ++i)
{
for (int j = i + 1; j < 4; ++j)
{
devices[i][j] = p2p.Install (nodes.Get (i), nodes.Get (j));
}
}
// Install VTP on all nodes
VtpHelper vtp;
vtp.Install (nodes);
// Install Internet stack
InternetStackHelper internet;
internet.Install (nodes);
// Assign IP addresses
Ipv4AddressHelper address;
for (int i = 0; i < 4; ++i)
{
for (int j = i + 1; j < 4; ++j)
{
std::ostringstream subnet;
subnet << “10.” << i << “.” << j << “.0”;
address.SetBase (subnet.str ().c_str (), “255.255.255.0”);
address.Assign (devices[i][j]);
}
}
// Create a packet sink to receive packets
uint16_t sinkPort = 8080;
Address sinkAddress (InetSocketAddress (Ipv4Address (“10.0.0.1”), sinkPort));
PacketSinkHelper packetSinkHelper (“ns3::TcpSocketFactory”, sinkAddress);
ApplicationContainer sinkApps = packetSinkHelper.Install (nodes.Get (0));
sinkApps.Start (Seconds (1.0));
sinkApps.Stop (Seconds (10.0));
// Create a TCP client to send packets
OnOffHelper clientHelper (“ns3::TcpSocketFactory”, sinkAddress);
clientHelper.SetAttribute (“OnTime”, StringValue (“ns3::ConstantRandomVariable[Constant=1]”));
clientHelper.SetAttribute (“OffTime”, StringValue (“ns3::ConstantRandomVariable[Constant=0]”));
clientHelper.SetAttribute (“DataRate”, DataRateValue (DataRate (“1Mbps”)));
clientHelper.SetAttribute (“PacketSize”, UintegerValue (1024));
ApplicationContainer clientApps = clientHelper.Install (nodes.Get (1));
clientApps.Start (Seconds (2.0));
clientApps.Stop (Seconds (10.0));
// Enable tracing
AsciiTraceHelper ascii;
p2p.EnableAsciiAll (ascii.CreateFileStream (“vtp-routing.tr”));
p2p.EnablePcapAll (“vtp-routing”);
// Run the simulation
Simulator::Run ();
Simulator::Destroy ();
return 0;
}
Running the Simulation
To run the simulation, compile the script and execute it:
./waf configure –enable-examples
./waf build
./waf –run vtp-simulation
Finally we had a deep guide on implementing VLAN Trunking Protocol (VTP) in ns3 by creating a module that can handle VLAN configurations and propagate this information across the network. also, we provide more related information on VLAN Trunking Protocol (VTP).
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