154 lines
5.0 KiB
C++
154 lines
5.0 KiB
C++
/*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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*/
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//
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// Network topology
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//
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// n0
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// \ 5 Mb/s, 2ms
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// \ 1.5Mb/s, 10ms
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// n2 ------------------------n3
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// / /
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// / 5 Mb/s, 2ms /
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// n1--------------------------
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// 1.5 Mb/s, 100ms
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//
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// this is a modification of simple-global-routing to allow for
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// a single hop but higher-cost path between n1 and n3
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//
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// - Tracing of queues and packet receptions to file "simple-rerouting.tr"
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#include "ns3/applications-module.h"
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#include "ns3/core-module.h"
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#include "ns3/internet-module.h"
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#include "ns3/ipv4-global-routing-helper.h"
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#include "ns3/network-module.h"
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#include "ns3/point-to-point-module.h"
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#include <cassert>
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#include <fstream>
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#include <iostream>
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#include <string>
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE("SimpleAlternateRoutingExample");
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int
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main(int argc, char* argv[])
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{
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// Users may find it convenient to turn on explicit debugging
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// for selected modules; the below lines suggest how to do this
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#if 0
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LogComponentEnable ("GlobalRoutingHelper", LOG_LOGIC);
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LogComponentEnable ("GlobalRouter", LOG_LOGIC);
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#endif
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Config::SetDefault("ns3::OnOffApplication::PacketSize", UintegerValue(210));
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Config::SetDefault("ns3::OnOffApplication::DataRate", StringValue("300b/s"));
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// The below metric, if set to 3 or higher, will cause packets between
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// n1 and n3 to take the 2-hop route through n2
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CommandLine cmd(__FILE__);
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//
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// Additionally, we plumb this metric into the default value / command
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// line argument system as well, for exemplary purposes. This means
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// that it can be resettable at the command-line to the program,
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// rather than recompiling
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// e.g. ns3 --run "simple-alternate-routing --AlternateCost=5"
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uint16_t sampleMetric = 1;
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cmd.AddValue("AlternateCost",
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"This metric is used in the example script between n3 and n1 ",
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sampleMetric);
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// Allow the user to override any of the defaults and the above
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// DefaultValue::Bind ()s at run-time, via command-line arguments
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cmd.Parse(argc, argv);
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// Here, we will explicitly create four nodes. In more sophisticated
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// topologies, we could configure a node factory.
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NS_LOG_INFO("Create nodes.");
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NodeContainer c;
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c.Create(4);
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NodeContainer n0n2 = NodeContainer(c.Get(0), c.Get(2));
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NodeContainer n1n2 = NodeContainer(c.Get(1), c.Get(2));
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NodeContainer n3n2 = NodeContainer(c.Get(3), c.Get(2));
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NodeContainer n1n3 = NodeContainer(c.Get(1), c.Get(3));
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// We create the channels first without any IP addressing information
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NS_LOG_INFO("Create channels.");
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PointToPointHelper p2p;
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p2p.SetDeviceAttribute("DataRate", StringValue("5Mbps"));
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p2p.SetChannelAttribute("Delay", StringValue("2ms"));
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NetDeviceContainer d0d2 = p2p.Install(n0n2);
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NetDeviceContainer d1d2 = p2p.Install(n1n2);
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p2p.SetDeviceAttribute("DataRate", StringValue("1500kbps"));
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p2p.SetChannelAttribute("Delay", StringValue("10ms"));
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NetDeviceContainer d3d2 = p2p.Install(n3n2);
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p2p.SetChannelAttribute("Delay", StringValue("100ms"));
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NetDeviceContainer d1d3 = p2p.Install(n1n3);
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InternetStackHelper internet;
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internet.Install(c);
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// Later, we add IP addresses. The middle two octets correspond to
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// the channel number.
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NS_LOG_INFO("Assign IP Addresses.");
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Ipv4AddressHelper ipv4;
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ipv4.SetBase("10.0.0.0", "255.255.255.0");
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ipv4.Assign(d0d2);
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ipv4.SetBase("10.1.1.0", "255.255.255.0");
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Ipv4InterfaceContainer i1i2 = ipv4.Assign(d1d2);
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ipv4.SetBase("10.2.2.0", "255.255.255.0");
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ipv4.Assign(d3d2);
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ipv4.SetBase("10.3.3.0", "255.255.255.0");
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Ipv4InterfaceContainer i1i3 = ipv4.Assign(d1d3);
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i1i3.SetMetric(0, sampleMetric);
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i1i3.SetMetric(1, sampleMetric);
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// Create router nodes, initialize routing database and set up the routing
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// tables in the nodes.
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Ipv4GlobalRoutingHelper::PopulateRoutingTables();
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// Create the OnOff application to send UDP datagrams
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NS_LOG_INFO("Create Application.");
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uint16_t port = 9; // Discard port (RFC 863)
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// Create a flow from n3 to n1, starting at time 1.1 seconds
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OnOffHelper onoff("ns3::UdpSocketFactory",
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Address(InetSocketAddress(i1i2.GetAddress(0), port)));
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onoff.SetConstantRate(DataRate("300b/s"));
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ApplicationContainer apps = onoff.Install(c.Get(3));
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apps.Start(Seconds(1.1));
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apps.Stop(Seconds(10));
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// Create a packet sink to receive these packets
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PacketSinkHelper sink("ns3::UdpSocketFactory",
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Address(InetSocketAddress(Ipv4Address::GetAny(), port)));
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apps = sink.Install(c.Get(1));
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apps.Start(Seconds(1.1));
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apps.Stop(Seconds(10));
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AsciiTraceHelper ascii;
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p2p.EnableAsciiAll(ascii.CreateFileStream("simple-alternate-routing.tr"));
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p2p.EnablePcapAll("simple-alternate-routing");
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NS_LOG_INFO("Run Simulation.");
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Simulator::Run();
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Simulator::Destroy();
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NS_LOG_INFO("Done.");
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return 0;
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}
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