NS3搭建网络拓扑图

//// Network topology////  n0//     \ p-p//      \          (shared csma/cd)      p-p//       n2 -------------------------n3--------n7//      /            |        | //     / p-p        n4--n8    n5 ---------- n6//   n1                              p-p//// - CBR/UDP flows from n0 to n6// - Tracing of queues and packet receptions to file "mixed-global-routing.tr"#include <iostream>#include <fstream>#include <string>#include <cassert>#include "ns3/core-module.h"#include "ns3/network-module.h"#include "ns3/point-to-point-module.h"#include "ns3/csma-module.h"#include "ns3/applications-module.h"#include "ns3/internet-module.h"using namespace ns3;NS_LOG_COMPONENT_DEFINE ("MixedGlobalRoutingExample");int main (int argc, char *argv[]){  Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (210));  Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("448kb/s"));  // Allow the user to override any of the defaults and the above  // Bind ()s at run-time, via command-line arguments  CommandLine cmd;  cmd.Parse (argc, argv);  NS_LOG_INFO ("Create nodes.");  NodeContainer c;  c.Create (9);  NodeContainer n0n2 = NodeContainer (c.Get (0), c.Get (2));  NodeContainer n1n2 = NodeContainer (c.Get (1), c.Get (2));  NodeContainer n5n6 = NodeContainer (c.Get (5), c.Get (6));  NodeContainer n3n7 = NodeContainer (c.Get (3), c.Get (7));  NodeContainer n4n8 = NodeContainer (c.Get (4), c.Get (8));  NodeContainer n2345 = NodeContainer (c.Get (2), c.Get (3), c.Get (4), c.Get (5));  InternetStackHelper internet;  internet.Install (c);  // We create the channels first without any IP addressing information  NS_LOG_INFO ("Create channels.");  PointToPointHelper p2p;  p2p.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));  p2p.SetChannelAttribute ("Delay", StringValue ("2ms"));  NetDeviceContainer d0d2 = p2p.Install (n0n2);  NetDeviceContainer d1d2 = p2p.Install (n1n2);  p2p.SetDeviceAttribute ("DataRate", StringValue ("1500kbps"));  p2p.SetChannelAttribute ("Delay", StringValue ("10ms"));  NetDeviceContainer d5d6 = p2p.Install (n5n6);    NetDeviceContainer d3d7 = p2p.Install (n3n7);    NetDeviceContainer d4d8 = p2p.Install (n4n8);  // We create the channels first without any IP addressing information  CsmaHelper csma;  csma.SetChannelAttribute ("DataRate", StringValue ("5Mbps"));  csma.SetChannelAttribute ("Delay", StringValue ("2ms"));  NetDeviceContainer d2345 = csma.Install (n2345);  // Later, we add IP addresses.  NS_LOG_INFO ("Assign IP Addresses.");  Ipv4AddressHelper ipv4;  ipv4.SetBase ("10.1.1.0", "255.255.255.0");  ipv4.Assign (d0d2);  ipv4.SetBase ("10.1.2.0", "255.255.255.0");  ipv4.Assign (d1d2);  ipv4.SetBase ("10.1.3.0", "255.255.255.0");  Ipv4InterfaceContainer i5i6 = ipv4.Assign (d5d6);  ipv4.SetBase ("10.1.4.0", "255.255.255.0");  Ipv4InterfaceContainer i3i7 = ipv4.Assign (d3d7);  ipv4.SetBase ("10.1.5.0", "255.255.255.0");  Ipv4InterfaceContainer i4i8 = ipv4.Assign (d4d8);  ipv4.SetBase ("10.250.1.0", "255.255.255.0");  ipv4.Assign (d2345);  // Create router nodes, initialize routing database and set up the routing  // tables in the nodes.  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();  // Create the OnOff application to send UDP datagrams of size  // 210 bytes at a rate of 448 Kb/s  NS_LOG_INFO ("Create Applications.");  uint16_t port = 9;   // Discard port (RFC 863)  OnOffHelper onoff ("ns3::UdpSocketFactory",                     InetSocketAddress (i5i6.GetAddress (1), port));  onoff.SetConstantRate (DataRate ("300bps"));  onoff.SetAttribute ("PacketSize", UintegerValue (50));  ApplicationContainer apps = onoff.Install (c.Get (0));  apps.Start (Seconds (1.0));  apps.Stop (Seconds (10.0));  AsciiTraceHelper ascii;  Ptr<OutputStreamWrapper> stream = ascii.CreateFileStream ("mixed-global-routing.tr");  p2p.EnableAsciiAll (stream);  csma.EnableAsciiAll (stream);  p2p.EnablePcapAll ("mixed-global-routing");  csma.EnablePcapAll ("mixed-global-routing", false);  NS_LOG_INFO ("Run Simulation.");  Simulator::Run ();  Simulator::Destroy ();  NS_LOG_INFO ("Done.");}

参考NS3源码,初步搭建了一个网络拓扑结构，可以添加子网。

执行  ./waf --run test  --vis

将输出网络拓扑结构。