/* -*- 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 * * Contributed by: Luis Cortes (cortes@gatech.edu) */ // This script exercises global routing code in a mixed point-to-point // and csma/cd environment // // 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 start to be dropped // At time 3s, call RecomputeRoutingTables() and traffic will // start flowing again on the alternate path // At time 4s, re-enable the n1/n6 interface to up. Will not change routing // At time 5s, call RecomputeRoutingTables() and traffic will start flowing // again on the original path // 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). Packets // will traverse the link and be dropped at n6 upon receipt. These drops // are not visible in the pcap trace but in the ascii trace. // At time 7s, call RecomputeRoutingTables() and traffic will flow again // through the path n1-n2-n5-n6 // At time 8s, bring the interface back up. // At time 9s, call RecomputeRoutingTables() and traffic will flow again // through the path n1-n6 // 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 start to be dropped // At time 13s, call RecomputeRoutingTables() and traffic will // start flowing again on 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 15s, call RecomputeRoutingTables(), but there is no effect // since global routing is lower in priority than static routing // At time 16s, stop the second flow. // - Tracing of queues and packet receptions to file "dynamic-global-routing.tr" #include #include #include #include #include "ns3/core-module.h" #include "ns3/simulator-module.h" #include "ns3/node-module.h" #include "ns3/helper-module.h" using namespace ns3; NS_LOG_COMPONENT_DEFINE ("DynamicGlobalRoutingExample"); int main (int argc, char *argv[]) { // Allow the user to override any of the defaults and the above // Bind ()s at run-time, via command-line arguments CommandLine cmd; 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.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1))); onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0))); onoff.SetAttribute ("DataRate", StringValue ("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", RandomVariableValue (ConstantVariable (1))); onoff2.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (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)); std::ofstream ascii; ascii.open ("dynamic-global-routing.tr", std::ios_base::binary | std::ios_base::out); PointToPointHelper::EnablePcapAll ("dynamic-global-routing"); PointToPointHelper::EnableAsciiAll (ascii); CsmaHelper::EnablePcapAll ("dynamic-global-routing", false); CsmaHelper::EnableAsciiAll (ascii); InternetStackHelper::EnableAsciiAll (ascii); 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 (3),&Ipv4GlobalRoutingHelper::RecomputeRoutingTables); Simulator::Schedule (Seconds (4),&Ipv4::SetUp,ipv41, ipv4ifIndex1); Simulator::Schedule (Seconds (5),&Ipv4GlobalRoutingHelper::RecomputeRoutingTables); 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 (7),&Ipv4GlobalRoutingHelper::RecomputeRoutingTables); Simulator::Schedule (Seconds (8),&Ipv4::SetUp,ipv46, ipv4ifIndex6); Simulator::Schedule (Seconds (9),&Ipv4GlobalRoutingHelper::RecomputeRoutingTables); Simulator::Schedule (Seconds (12),&Ipv4::SetDown,ipv41, ipv4ifIndex1); Simulator::Schedule (Seconds (13),&Ipv4GlobalRoutingHelper::RecomputeRoutingTables); Simulator::Schedule (Seconds (14),&Ipv4::SetUp,ipv41, ipv4ifIndex1); Simulator::Schedule (Seconds (15),&Ipv4GlobalRoutingHelper::RecomputeRoutingTables); NS_LOG_INFO ("Run Simulation."); Simulator::Run (); Simulator::Destroy (); NS_LOG_INFO ("Done."); }