/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// Network topology
//
// bridge1 The node named bridge1 (node 5 in the nodelist)
// ------------------ has three CMSA net devices that are bridged
// CSMA CSMA CSMA together using a BridgeNetDevice.
// | | |
// | | | The bridge node talks over three CSMA channels
// | | |
// CSMA CSMA CSMA to three other CSMA net devices
// ---- ---- ----
// n0 n1 n2 Node two acts as a router and talks to another
// ---- bridge that connects the remaining nodes.
// CSMA
// |
// n3 n4 |
// ---- ---- |
// CSMA CSMA |
// | | |
// | | |
// | | |
// CSMA CSMA CSMA The node named bridge2 (node 6 in the nodelist)
// ------------------ has three CMSA net devices that are bridged
// bridge2 together using a BridgeNetDevice.
//
// Or, more abstractly, recognizing that bridge 1 and bridge 2 are nodes
// with three net devices:
//
// n0 n1 (n0 = 10.1.1.2)
// | | (n1 = 10.1.1.3) Note odd addressing
// ----------- (n2 = 10.1.1.1)
// | bridge1 | <- n5
// -----------
// |
// router <- n2
// |
// -----------
// | bridge2 | <- n6
// ----------- (n2 = 10.1.2.1)
// | | (n3 = 10.1.2.2)
// n3 n4 (n4 = 10.1.2.3)
//
// So, this example shows two broadcast domains, each interconnected by a bridge
// with a router node (n2) interconnecting the layer-2 broadcast domains
//
// It is meant to mirror somewhat the csma-bridge example but adds another
// bridged link separated by a router.
//
// - CBR/UDP flows from n0 (10.1.1.2) to n1 (10.1.1.3) and from n3 (10.1.2.2) to n0 (10.1.1.3)
// - DropTail queues
// - Global static routing
// - Tracing of queues and packet receptions to file "csma-bridge-one-hop.tr"
#include <iostream>
#include <fstream>
#include "ns3/simulator-module.h"
#include "ns3/node-module.h"
#include "ns3/core-module.h"
#include "ns3/helper-module.h"
#include "ns3/bridge-module.h"
#include "ns3/global-route-manager.h"
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("CsmaBridgeOneHopExample");
int
main (int argc, char *argv[])
{
//
// Users may find it convenient to turn on explicit debugging
// for selected modules; the below lines suggest how to do this
//
#if 0
LogComponentEnable ("CsmaBridgeOneHopExample", LOG_LEVEL_INFO);
#endif
//
// Allow the user to override any of the defaults and the above Bind() at
// run-time, via command-line arguments
//
CommandLine cmd;
cmd.Parse (argc, argv);
//
// Explicitly create the nodes required by the topology (shown above).
//
NS_LOG_INFO ("Create nodes.");
Ptr<Node> n0 = CreateObject<Node> ();
Ptr<Node> n1 = CreateObject<Node> ();
Ptr<Node> n2 = CreateObject<Node> ();
Ptr<Node> n3 = CreateObject<Node> ();
Ptr<Node> n4 = CreateObject<Node> ();
Ptr<Node> bridge1 = CreateObject<Node> ();
Ptr<Node> bridge2 = CreateObject<Node> ();
NS_LOG_INFO ("Build Topology");
CsmaHelper csma;
csma.SetChannelAttribute ("DataRate", DataRateValue (5000000));
csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));
// Create the csma links, from each terminal to the bridge
// This will create six network devices; we'll keep track separately
// of the devices on and off the bridge respectively, for later configuration
NetDeviceContainer topLanDevices;
NetDeviceContainer topBridgeDevices;
// It is easier to iterate the nodes in C++ if we put them into a container
NodeContainer topLan (n2, n0, n1);
for (int i = 0; i < 3; i++)
{
// install a csma channel between the ith toplan node and the bridge node
NetDeviceContainer link = csma.Install (NodeContainer (topLan.Get (i), bridge1));
topLanDevices.Add (link.Get (0));
topBridgeDevices.Add (link.Get (1));
}
//
// Now, Create the bridge netdevice, which will do the packet switching. The
// bridge lives on the node bridge1 and bridges together the topBridgeDevices
// which are the three CSMA net devices on the node in the diagram above.
//
BridgeHelper bridge;
bridge.Install (bridge1, topBridgeDevices);
// Add internet stack to the topLan nodes
InternetStackHelper internet;
internet.Install (topLan);
// Repeat for bottom bridged LAN
NetDeviceContainer bottomLanDevices;
NetDeviceContainer bottomBridgeDevices;
NodeContainer bottomLan (n2, n3, n4);
for (int i = 0; i < 3; i++)
{
NetDeviceContainer link = csma.Install (NodeContainer (bottomLan.Get (i), bridge2));
bottomLanDevices.Add (link.Get (0));
bottomBridgeDevices.Add (link.Get (1));
}
bridge.Install (bridge2, bottomBridgeDevices);
// Add internet stack to the bottomLan nodes
internet.Install (NodeContainer (n3, n4));
// We've got the "hardware" in place. Now we need to add IP addresses.
NS_LOG_INFO ("Assign IP Addresses.");
Ipv4AddressHelper ipv4;
ipv4.SetBase ("10.1.1.0", "255.255.255.0");
ipv4.Assign (topLanDevices);
ipv4.SetBase ("10.1.2.0", "255.255.255.0");
ipv4.Assign (bottomLanDevices);
//
// Create router nodes, initialize routing database and set up the routing
// tables in the nodes. We excuse the bridge nodes from having to serve as
// routers, since they don't even have internet stacks on them.
//
NodeContainer routerNodes (n0, n1, n2, n3, n4);
GlobalRouteManager::PopulateRoutingTables (routerNodes);
//
// Create an OnOff application to send UDP datagrams from node zero to node 1.
//
NS_LOG_INFO ("Create Applications.");
uint16_t port = 9; // Discard port (RFC 863)
OnOffHelper onoff ("ns3::UdpSocketFactory",
Address (InetSocketAddress (Ipv4Address ("10.1.1.3"), port)));
onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));
onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));
ApplicationContainer app = onoff.Install (n0);
// Start the application
app.Start (Seconds (1.0));
app.Stop (Seconds (10.0));
// Create an optional packet sink to receive these packets
PacketSinkHelper sink ("ns3::UdpSocketFactory",
Address (InetSocketAddress (Ipv4Address::GetAny (), port)));
ApplicationContainer sink1 = sink.Install (n1);
sink1.Start (Seconds (1.0));
sink1.Stop (Seconds (10.0));
//
// Create a similar flow from n3 to n0, starting at time 1.1 seconds
//
onoff.SetAttribute ("Remote",
AddressValue (InetSocketAddress (Ipv4Address ("10.1.1.2"), port)));
ApplicationContainer app2 = onoff.Install (n3);
app2.Start (Seconds (1.1));
app2.Stop (Seconds (10.0));
ApplicationContainer sink2 = sink.Install (n0);
sink2.Start (Seconds (1.1));
sink2.Stop (Seconds (10.0));
//
// Configure tracing of all enqueue, dequeue, and NetDevice receive events.
// Trace output will be sent to the file "csma-bridge-one-hop.tr"
//
NS_LOG_INFO ("Configure Tracing.");
std::ofstream ascii;
ascii.open ("csma-bridge-one-hop.tr");
CsmaHelper::EnableAsciiAll (ascii);
//
// Also configure some tcpdump traces; each interface will be traced.
// The output files will be named:
// csma-bridge-<nodeId>-<interfaceId>.pcap
// and can be read by the "tcpdump -r" command (use "-tt" option to
// display timestamps correctly)
//
CsmaHelper::EnablePcapAll ("csma-bridge-one-hop", false);
//
// Now, do the actual simulation.
//
NS_LOG_INFO ("Run Simulation.");
Simulator::Run ();
Simulator::Destroy ();
NS_LOG_INFO ("Done.");
}