建立總線型拓撲。

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#include "ns3/core-module.h"

#include "ns3/network-module.h"

#include "ns3/csma-module.h"

#include "ns3/internet-module.h"

#include "ns3/point-to-point-module.h"

#include "ns3/applications-module.h"

#include "ns3/ipv4-global-routing-helper.h"

// Default Network Topology

//

// 10.1.1.0

// n0 -------------- n1 n2 n3 n4

// point-to-point | | | |

// ================

// LAN 10.1.2.0

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("SecondScriptExample");

int

main (int argc, char *argv[])

{

//定義變量，用于決定是否開啟2個UdpApplication的Logging組件；默認true開啟。

bool verbose = true;

uint32_t nCsma = 3;//LAN有3個node。

CommandLine cmd;

cmd.AddValue ("nCsma", "Number of \"extra\" CSMA nodes/devices", nCsma);

cmd.AddValue ("verbose", "Tell echo applications to log if true", verbose);

cmd.Parse (argc,argv);

if (verbose)

{

LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);

LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);

}

nCsma = nCsma == 0 ? 1 : nCsma;

/**************************網絡拓撲部分****************************/

//創建使用P2P鏈路的2個node

NodeContainer p2pNodes;

p2pNodes.Create (2);

//創建另一個NodeContainer類對象，用于總線（CSMA）網絡

NodeContainer csmaNodes;

csmaNodes.Add (p2pNodes.Get (1));

csmaNodes.Create (nCsma);//將之前P2P的NodeContainer的第二個節點（索引1）添加到CSMA的Nodeontainer，獲得CSMA device；這個node將會有2個device

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));

pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));

//安裝P2P網卡設備到P2P網絡節點，同first.cc

NetDeviceContainer p2pDevices;

p2pDevices = pointToPoint.Install (p2pNodes);

//類似于P2PHelper,CsmaHelper幫助創建和連接CSMA設備及信道

CsmaHelper csma;

csma.SetChannelAttribute ("DataRate", StringValue ("100Mbps"));

//數據率由channel屬性指定，而非Device屬性，因為CSMA不允許同一信道有多個不同數據率的設備。

csma.SetChannelAttribute ("Delay", TimeValue (NanoSeconds (6560)));

NetDeviceContainer csmaDevices;

csmaDevices = csma.Install (csmaNodes);

//安裝網絡協議

InternetStackHelper stack;

stack.Install (p2pNodes.Get (0));//P2P鏈路中的第一節點

stack.Install (csmaNodes);

//P2P鏈路中的第二節點包含在csmaNodes中。

Ipv4AddressHelper address;//2個網段的IP地址類對象

address.SetBase ("10.1.1.0", "255.255.255.0");//安排P2P網段的地址

Ipv4InterfaceContainer p2pInterfaces;

p2pInterfaces = address.Assign (p2pDevices);

address.SetBase ("10.1.2.0", "255.255.255.0");

Ipv4InterfaceContainer csmaInterfaces;

csmaInterfaces = address.Assign (csmaDevices);

/**************************網絡拓撲部分結束****************************/

/**************************應用程序部分****************************/

UdpEchoServerHelper echoServer (9);

//將Server服務安裝在CSMA網段的最后一個節點上，nCsma是可變的，所以不能用3.

ApplicationContainer serverApps = echoServer.Install (csmaNodes.Get (nCsma));

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

UdpEchoClientHelper echoClient (csmaInterfaces.GetAddress (nCsma), 9);

echoClient.SetAttribute ("MaxPackets", UintegerValue (1));

echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));

echoClient.SetAttribute ("PacketSize", UintegerValue (1024));

ApplicationContainer clientApps = echoClient.Install (p2pNodes.Get (0));

clientApps.Start (Seconds (2.0));

clientApps.Stop (Seconds (10.0));

/**************************應用程序部分結束****************************/

/********************調用全局路由Helper幫助建立網絡路由*********************/

Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

//全局路由管理器根據節點產生的鏈路通告為每個節點建立路由表

pointToPoint.EnablePcapAll ("second");//second是前綴名，不用擔心命名問題

csma.EnablePcap ("second", csmaDevices.Get (1), true);//開啟csmahelper類對象的pcap

//Netevice不用取得ID，可以直接使用，但是Node需要進一步查找ID

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

運行結果：

前面兩個都是

后面一個是

由于要查找誰有該ip所以發送arp消息。

使用可視化：./waf --run second --vis

轉載于:https://www.cnblogs.com/tempal/p/3798938.html

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