/* * 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 * * Contributed by: Luis Cortes (cortes@gatech.edu) */ // This script exercises global routing code in a mixed point-to-point // and csma/cd environment. We bring up and down interfaces and observe // the effect on global routing. We explicitly enable the attribute // to respond to interface events, so that routes are recomputed // automatically. // // Network topology // // n0 // \ p-p // \ (shared csma/cd) // n2 -------------------------n3 // / | | // / p-p n4 n5 ---------- n6 // n1 p-p // | | // ---------------------------------------- // p-p // // - at time 1 CBR/UDP flow from n1 to n6's IP address on the n5/n6 link // - at time 10, start similar flow from n1 to n6's address on the n1/n6 link // // Order of events // At pre-simulation time, configure global routes. Shortest path from // n1 to n6 is via the direct point-to-point link // At time 1s, start CBR traffic flow from n1 to n6 // At time 2s, set the n1 point-to-point interface to down. Packets // will be diverted to the n1-n2-n5-n6 path // At time 4s, re-enable the n1/n6 interface to up. n1-n6 route restored. // At time 6s, set the n6-n1 point-to-point Ipv4 interface to down (note, this // keeps the point-to-point link "up" from n1's perspective). Traffic will // flow through the path n1-n2-n5-n6 // At time 8s, bring the interface back up. Path n1-n6 is restored // At time 10s, stop the first flow. // At time 11s, start a new flow, but to n6's other IP address (the one // on the n1/n6 p2p link) // At time 12s, bring the n1 interface down between n1 and n6. Packets // will be diverted to the alternate path // At time 14s, re-enable the n1/n6 interface to up. This will change // routing back to n1-n6 since the interface up notification will cause // a new local interface route, at higher priority than global routing // At time 16s, stop the second flow. // - Tracing of queues and packet receptions to file "dynamic-global-routing.tr" #include "ns3/applications-module.h" #include "ns3/core-module.h" #include "ns3/csma-module.h" #include "ns3/internet-module.h" #include "ns3/ipv4-global-routing-helper.h" #include "ns3/network-module.h" #include "ns3/point-to-point-module.h" #include #include #include #include using namespace ns3; NS_LOG_COMPONENT_DEFINE("DynamicGlobalRoutingExample"); int main(int argc, char* argv[]) { // The below value configures the default behavior of global routing. // By default, it is disabled. To respond to interface events, set to true Config::SetDefault("ns3::Ipv4GlobalRouting::RespondToInterfaceEvents", BooleanValue(true)); // Allow the user to override any of the defaults and the above // Bind ()s at run-time, via command-line arguments CommandLine cmd(__FILE__); cmd.Parse(argc, argv); NS_LOG_INFO("Create nodes."); NodeContainer c; c.Create(7); NodeContainer n0n2 = NodeContainer(c.Get(0), c.Get(2)); NodeContainer n1n2 = NodeContainer(c.Get(1), c.Get(2)); NodeContainer n5n6 = NodeContainer(c.Get(5), c.Get(6)); NodeContainer n1n6 = NodeContainer(c.Get(1), c.Get(6)); NodeContainer n2345 = NodeContainer(c.Get(2), c.Get(3), c.Get(4), c.Get(5)); InternetStackHelper internet; internet.Install(c); // 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 d1d6 = p2p.Install(n1n6); NetDeviceContainer d1d2 = p2p.Install(n1n2); p2p.SetDeviceAttribute("DataRate", StringValue("1500kbps")); p2p.SetChannelAttribute("Delay", StringValue("10ms")); NetDeviceContainer d5d6 = p2p.Install(n5n6); // We create the channels first without any IP addressing information CsmaHelper csma; csma.SetChannelAttribute("DataRate", StringValue("5Mbps")); csma.SetChannelAttribute("Delay", StringValue("2ms")); NetDeviceContainer d2345 = csma.Install(n2345); // Later, we add IP addresses. NS_LOG_INFO("Assign IP Addresses."); Ipv4AddressHelper ipv4; ipv4.SetBase("10.1.1.0", "255.255.255.0"); ipv4.Assign(d0d2); ipv4.SetBase("10.1.2.0", "255.255.255.0"); ipv4.Assign(d1d2); ipv4.SetBase("10.1.3.0", "255.255.255.0"); Ipv4InterfaceContainer i5i6 = ipv4.Assign(d5d6); ipv4.SetBase("10.250.1.0", "255.255.255.0"); ipv4.Assign(d2345); ipv4.SetBase("172.16.1.0", "255.255.255.0"); Ipv4InterfaceContainer i1i6 = ipv4.Assign(d1d6); // 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 of size // 210 bytes at a rate of 448 Kb/s NS_LOG_INFO("Create Applications."); uint16_t port = 9; // Discard port (RFC 863) OnOffHelper onoff("ns3::UdpSocketFactory", InetSocketAddress(i5i6.GetAddress(1), port)); onoff.SetConstantRate(DataRate("2kbps")); onoff.SetAttribute("PacketSize", UintegerValue(50)); ApplicationContainer apps = onoff.Install(c.Get(1)); apps.Start(Seconds(1.0)); apps.Stop(Seconds(10.0)); // Create a second OnOff application to send UDP datagrams of size // 210 bytes at a rate of 448 Kb/s OnOffHelper onoff2("ns3::UdpSocketFactory", InetSocketAddress(i1i6.GetAddress(1), port)); onoff2.SetAttribute("OnTime", StringValue("ns3::ConstantRandomVariable[Constant=1]")); onoff2.SetAttribute("OffTime", StringValue("ns3::ConstantRandomVariable[Constant=0]")); onoff2.SetAttribute("DataRate", StringValue("2kbps")); onoff2.SetAttribute("PacketSize", UintegerValue(50)); ApplicationContainer apps2 = onoff2.Install(c.Get(1)); apps2.Start(Seconds(11.0)); apps2.Stop(Seconds(16.0)); // Create an optional packet sink to receive these packets PacketSinkHelper sink("ns3::UdpSocketFactory", Address(InetSocketAddress(Ipv4Address::GetAny(), port))); apps = sink.Install(c.Get(6)); apps.Start(Seconds(1.0)); apps.Stop(Seconds(10.0)); PacketSinkHelper sink2("ns3::UdpSocketFactory", Address(InetSocketAddress(Ipv4Address::GetAny(), port))); apps2 = sink2.Install(c.Get(6)); apps2.Start(Seconds(11.0)); apps2.Stop(Seconds(16.0)); AsciiTraceHelper ascii; Ptr stream = ascii.CreateFileStream("dynamic-global-routing.tr"); p2p.EnableAsciiAll(stream); csma.EnableAsciiAll(stream); internet.EnableAsciiIpv4All(stream); p2p.EnablePcapAll("dynamic-global-routing"); csma.EnablePcapAll("dynamic-global-routing", false); Ptr n1 = c.Get(1); Ptr ipv41 = n1->GetObject(); // The first ifIndex is 0 for loopback, then the first p2p is numbered 1, // then the next p2p is numbered 2 uint32_t ipv4ifIndex1 = 2; Simulator::Schedule(Seconds(2), &Ipv4::SetDown, ipv41, ipv4ifIndex1); Simulator::Schedule(Seconds(4), &Ipv4::SetUp, ipv41, ipv4ifIndex1); Ptr n6 = c.Get(6); Ptr ipv46 = n6->GetObject(); // The first ifIndex is 0 for loopback, then the first p2p is numbered 1, // then the next p2p is numbered 2 uint32_t ipv4ifIndex6 = 2; Simulator::Schedule(Seconds(6), &Ipv4::SetDown, ipv46, ipv4ifIndex6); Simulator::Schedule(Seconds(8), &Ipv4::SetUp, ipv46, ipv4ifIndex6); Simulator::Schedule(Seconds(12), &Ipv4::SetDown, ipv41, ipv4ifIndex1); Simulator::Schedule(Seconds(14), &Ipv4::SetUp, ipv41, ipv4ifIndex1); // Trace routing tables Ipv4GlobalRoutingHelper g; Ptr routingStream = Create("dynamic-global-routing.routes", std::ios::out); g.PrintRoutingTableAllAt(Seconds(12), routingStream); NS_LOG_INFO("Run Simulation."); Simulator::Run(); Simulator::Destroy(); NS_LOG_INFO("Done."); return 0; }