1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 as
5 * published by the Free Software Foundation;
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 */
16
17 // Network topology
18 //
19 // n0 n1
20 // | |
21 // ----------
22 // | Switch |
23 // ----------
24 // | |
25 // n2 n3
26 //
27 //
28 // - CBR/UDP flows from n0 to n1 and from n3 to n0
29 // - DropTail queues
30 // - Tracing of queues and packet receptions to file "csma-bridge.tr"
31
32 #include <iostream>
33 #include <fstream>
34
35 #include "ns3/core-module.h"
36 #include "ns3/network-module.h"
37 #include "ns3/applications-module.h"
38 #include "ns3/bridge-module.h"
39 #include "ns3/csma-module.h"
40 #include "ns3/internet-module.h"
41
42 /**
43 * \file
44 * \ingroup bridge
45 * Bridge example connecting four nodes,
46 * with the bridge acting as a simple switch.
47 */
48
49 using namespace ns3;
50
51 NS_LOG_COMPONENT_DEFINE ("CsmaBridgeExample");
52
53 int
main(int argc,char * argv[])54 main (int argc, char *argv[])
55 {
56 //
57 // Users may find it convenient to turn on explicit debugging
58 // for selected modules; the below lines suggest how to do this
59 //
60 #if 0
61 LogComponentEnable ("CsmaBridgeExample", LOG_LEVEL_INFO);
62 #endif
63
64 //
65 // Allow the user to override any of the defaults and the above Bind() at
66 // run-time, via command-line arguments
67 //
68 CommandLine cmd (__FILE__);
69 cmd.Parse (argc, argv);
70
71 //
72 // Explicitly create the nodes required by the topology (shown above).
73 //
74 NS_LOG_INFO ("Create nodes.");
75 NodeContainer terminals;
76 terminals.Create (4);
77
78 NodeContainer csmaSwitch;
79 csmaSwitch.Create (1);
80
81 NS_LOG_INFO ("Build Topology");
82 CsmaHelper csma;
83 csma.SetChannelAttribute ("DataRate", DataRateValue (5000000));
84 csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
85
86 // Create the csma links, from each terminal to the switch
87
88 NetDeviceContainer terminalDevices;
89 NetDeviceContainer switchDevices;
90
91 for (int i = 0; i < 4; i++)
92 {
93 NetDeviceContainer link = csma.Install (NodeContainer (terminals.Get (i), csmaSwitch));
94 terminalDevices.Add (link.Get (0));
95 switchDevices.Add (link.Get (1));
96 }
97
98 // Create the bridge netdevice, which will do the packet switching
99 Ptr<Node> switchNode = csmaSwitch.Get (0);
100 BridgeHelper bridge;
101 bridge.Install (switchNode, switchDevices);
102
103 // Add internet stack to the terminals
104 InternetStackHelper internet;
105 internet.Install (terminals);
106
107 // We've got the "hardware" in place. Now we need to add IP addresses.
108 //
109 NS_LOG_INFO ("Assign IP Addresses.");
110 Ipv4AddressHelper ipv4;
111 ipv4.SetBase ("10.1.1.0", "255.255.255.0");
112 ipv4.Assign (terminalDevices);
113
114 //
115 // Create an OnOff application to send UDP datagrams from node zero to node 1.
116 //
117 NS_LOG_INFO ("Create Applications.");
118 uint16_t port = 9; // Discard port (RFC 863)
119
120 OnOffHelper onoff ("ns3::UdpSocketFactory",
121 Address (InetSocketAddress (Ipv4Address ("10.1.1.2"), port)));
122 onoff.SetConstantRate (DataRate ("500kb/s"));
123
124 ApplicationContainer app = onoff.Install (terminals.Get (0));
125 // Start the application
126 app.Start (Seconds (1.0));
127 app.Stop (Seconds (10.0));
128
129 // Create an optional packet sink to receive these packets
130 PacketSinkHelper sink ("ns3::UdpSocketFactory",
131 Address (InetSocketAddress (Ipv4Address::GetAny (), port)));
132 app = sink.Install (terminals.Get (1));
133 app.Start (Seconds (0.0));
134
135 //
136 // Create a similar flow from n3 to n0, starting at time 1.1 seconds
137 //
138 onoff.SetAttribute ("Remote",
139 AddressValue (InetSocketAddress (Ipv4Address ("10.1.1.1"), port)));
140 app = onoff.Install (terminals.Get (3));
141 app.Start (Seconds (1.1));
142 app.Stop (Seconds (10.0));
143
144 app = sink.Install (terminals.Get (0));
145 app.Start (Seconds (0.0));
146
147 NS_LOG_INFO ("Configure Tracing.");
148
149 //
150 // Configure tracing of all enqueue, dequeue, and NetDevice receive events.
151 // Trace output will be sent to the file "csma-bridge.tr"
152 //
153 AsciiTraceHelper ascii;
154 csma.EnableAsciiAll (ascii.CreateFileStream ("csma-bridge.tr"));
155
156 //
157 // Also configure some tcpdump traces; each interface will be traced.
158 // The output files will be named:
159 // csma-bridge-<nodeId>-<interfaceId>.pcap
160 // and can be read by the "tcpdump -r" command (use "-tt" option to
161 // display timestamps correctly)
162 //
163 csma.EnablePcapAll ("csma-bridge", false);
164
165 //
166 // Now, do the actual simulation.
167 //
168 NS_LOG_INFO ("Run Simulation.");
169 Simulator::Run ();
170 Simulator::Destroy ();
171 NS_LOG_INFO ("Done.");
172 }
173