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/* -*- 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
//
// n0
// \ 5 Mb/s, 2ms
// \ 1.5Mb/s, 10ms
// n2 ------------------------n3
// / /
// / 5 Mb/s, 2ms /
// n1--------------------------
// 1.5 Mb/s, 100ms
//
// this is a modification of simple-global-routing to allow for
// a single hop but higher-cost path between n1 and n3
//
// - Tracing of queues and packet receptions to file "simple-rerouting.tr"
#include <iostream>
#include <fstream>
#include <string>
#include <cassert>
#include "ns3/core-module.h"
#include "ns3/internet-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/network-module.h"
#include "ns3/applications-module.h"
#include "ns3/ipv4-global-routing-helper.h"
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("SimpleAlternateRoutingExample");
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 ("GlobalRoutingHelper", LOG_LOGIC);
LogComponentEnable ("GlobalRouter", LOG_LOGIC);
#endif
Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (210));
Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("300b/s"));
// The below metric, if set to 3 or higher, will cause packets between
// n1 and n3 to take the 2-hop route through n2
CommandLine cmd;
//
// Additionally, we plumb this metric into the default value / command
// line argument system as well, for exemplary purposes. This means
// that it can be resettable at the command-line to the program,
// rather than recompiling
// e.g. waf --run "simple-alternate-routing --AlternateCost=5"
uint16_t sampleMetric = 1;
cmd.AddValue ("AlternateCost",
"This metric is used in the example script between n3 and n1 ",
sampleMetric);
// Allow the user to override any of the defaults and the above
// DefaultValue::Bind ()s at run-time, via command-line arguments
cmd.Parse (argc, argv);
// Here, we will explicitly create four nodes. In more sophisticated
// topologies, we could configure a node factory.
NS_LOG_INFO ("Create nodes.");
NodeContainer c;
c.Create (4);
NodeContainer n0n2 = NodeContainer (c.Get (0), c.Get (2));
NodeContainer n1n2 = NodeContainer (c.Get (1), c.Get (2));
NodeContainer n3n2 = NodeContainer (c.Get (3), c.Get (2));
NodeContainer n1n3 = NodeContainer (c.Get (1), c.Get (3));
// 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 d3d2 = p2p.Install (n3n2);
p2p.SetChannelAttribute ("Delay", StringValue ("100ms"));
NetDeviceContainer d1d3 = p2p.Install (n1n3);
InternetStackHelper internet;
internet.Install (c);
// Later, we add IP addresses. The middle two octets correspond to
// the channel number.
NS_LOG_INFO ("Assign IP Addresses.");
Ipv4AddressHelper ipv4;
ipv4.SetBase ("10.0.0.0", "255.255.255.0");
ipv4.Assign (d0d2);
ipv4.SetBase ("10.1.1.0", "255.255.255.0");
Ipv4InterfaceContainer i1i2 = ipv4.Assign (d1d2);
ipv4.SetBase ("10.2.2.0", "255.255.255.0");
ipv4.Assign (d3d2);
ipv4.SetBase ("10.3.3.0", "255.255.255.0");
Ipv4InterfaceContainer i1i3 = ipv4.Assign (d1d3);
i1i3.SetMetric (0, sampleMetric);
i1i3.SetMetric (1, sampleMetric);
// 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
NS_LOG_INFO ("Create Application.");
uint16_t port = 9; // Discard port (RFC 863)
// Create a flow from n3 to n1, starting at time 1.1 seconds
OnOffHelper onoff ("ns3::UdpSocketFactory",
Address (InetSocketAddress (i1i2.GetAddress (0), port)));
onoff.SetConstantRate (DataRate ("300b/s"));
ApplicationContainer apps = onoff.Install (c.Get (3));
apps.Start (Seconds (1.1));
apps.Stop (Seconds (10.0));
// Create a packet sink to receive these packets
PacketSinkHelper sink ("ns3::UdpSocketFactory",
Address (InetSocketAddress (Ipv4Address::GetAny (), port)));
apps = sink.Install (c.Get (1));
apps.Start (Seconds (1.1));
apps.Stop (Seconds (10.0));
AsciiTraceHelper ascii;
p2p.EnableAsciiAll (ascii.CreateFileStream ("simple-alternate-routing.tr"));
p2p.EnablePcapAll ("simple-alternate-routing");
NS_LOG_INFO ("Run Simulation.");
Simulator::Run ();
Simulator::Destroy ();
NS_LOG_INFO ("Done.");
return 0;
}
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