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csma version of install star and example

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This commit is contained in:
Craig Dowell
2008-10-24 17:29:26 -07:00
parent 017ecaeb3d
commit af16634027
4 changed files with 251 additions and 0 deletions
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201
examples/csma-star.cc Normal file
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@@ -0,0 +1,201 @@
/* -*- 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
*
*/
#include "ns3/core-module.h"
#include "ns3/simulator-module.h"
#include "ns3/node-module.h"
#include "ns3/helper-module.h"
#include "ns3/global-route-manager.h"
// Network topology (default)
//
// n2 + + n3 .
// | ... |\ /| ... | .
// ======= \ / ======= .
// CSMA \ / CSMA .
// \ / .
// n1 +--- n0 ---+ n4 .
// | ... | / \ | ... | .
// ======= / \ ======= .
// CSMA / \ CSMA .
// / \ .
// n6 + + n5 .
// | ... | | ... | .
// ======= ======= .
// CSMA CSMA .
//
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("CsmaStar");
int
main (int argc, char *argv[])
{
//
// Make the random number generators generate reproducible results.
//
RandomVariable::UseGlobalSeed (1, 1, 2, 3, 5, 8);
//
// Set up some default values for the simulation.
//
Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (137));
// ??? try and stick 15kb/s into the data rate
Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("14kb/s"));
//
// Default number of nodes in the star. Overridable by command line argument.
//
uint32_t nNodes = 7;
CommandLine cmd;
cmd.AddValue("nNodes", "Number of nodes to place in the star", nNodes);
cmd.Parse (argc, argv);
NS_LOG_INFO ("Create nodes.");
NodeContainer hubNode;
NodeContainer spokeNodes;
hubNode.Create (1);
Ptr<Node> hub = hubNode.Get (0);
spokeNodes.Create (nNodes - 1);
CsmaHelper csma;
csma.SetChannelAttribute ("DataRate", StringValue ("100Mbps"));
csma.SetChannelAttribute ("Delay", StringValue ("1ms"));
NS_LOG_INFO ("Build star topology.");
NetDeviceContainer hubDevices, spokeDevices;
csma.InstallStar (hubNode.Get (0), spokeNodes, hubDevices, spokeDevices);
NodeContainer fillNodes;
//
// Just to be nasy, hang some more nodes off of the CSMA channel for each
// spoke, so that there are a total of 16 nodes on each channel. Stash
// all of these new devices into a container.
//
NetDeviceContainer fillDevices;
uint32_t nFill = 14;
for (uint32_t i = 0; i < spokeDevices.GetN (); ++i)
{
Ptr<Channel> channel = spokeDevices.Get (i)->GetChannel ();
Ptr<CsmaChannel> csmaChannel = channel->GetObject<CsmaChannel> ();
NodeContainer newNodes;
NetDeviceContainer newDevices;
newNodes.Create (nFill);
fillNodes.Add (newNodes);
fillDevices.Add (csma.Install (newNodes, csmaChannel));
}
NS_LOG_INFO ("Install internet stack on all nodes.");
InternetStackHelper internet;
internet.Install (NodeContainer (hubNode, spokeNodes, fillNodes));
NS_LOG_INFO ("Assign IP Addresses.");
Ipv4AddressHelper address;
//
// Assign IPv4 interfaces and IP addresses to the devices we previously
// created. Keep track of the resulting addresses, one for the addresses
// of the hub node, and one for addresses on the spoke nodes. Despite the
// name of the class, what is visible to clients is really the address.
//
Ipv4InterfaceContainer hubAddresses;
Ipv4InterfaceContainer spokeAddresses;
for(uint32_t i = 0; i < spokeNodes.GetN (); ++i)
{
std::ostringstream subnet;
subnet << "10.1." << i << ".0";
NS_LOG_INFO ("Assign IP Addresses for CSMA subnet " << subnet.str ());
address.SetBase (subnet.str ().c_str (), "255.255.255.0");
hubAddresses.Add (address.Assign (hubDevices.Get (i)));
spokeAddresses.Add (address.Assign (spokeDevices.Get (i)));
}
NS_LOG_INFO ("Create applications.");
//
// Create a packet sink on the star "hub" to receive packets.
//
uint16_t port = 50000;
Address hubLocalAddress (InetSocketAddress (Ipv4Address::GetAny (), port));
PacketSinkHelper packetSinkHelper ("ns3::TcpSocketFactory", hubLocalAddress);
ApplicationContainer hubApp = packetSinkHelper.Install (hubNode);
hubApp.Start (Seconds (1.0));
hubApp.Stop (Seconds (10.0));
//
// Create OnOff applications to send TCP to the hub, one on each spoke node.
//
OnOffHelper onOffHelper ("ns3::TcpSocketFactory", Address ());
onOffHelper.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));
onOffHelper.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));
ApplicationContainer spokeApps;
for (uint32_t i = 0; i < spokeNodes.GetN (); ++i)
{
AddressValue remoteAddress (InetSocketAddress (hubAddresses.GetAddress (i), port));
onOffHelper.SetAttribute ("Remote", remoteAddress);
spokeApps.Add (onOffHelper.Install (spokeNodes.Get (i)));
}
spokeApps.Start (Seconds (1.0));
spokeApps.Stop (Seconds (10.0));
//
// Because we are evil, we also add OnOff applications to send TCP to the hub
// from the fill devices on each CSMA link. The first nFill nodes in the
// fillNodes container are on the CSMA network talking to the zeroth device
// on the hub node. The next nFill nodes are on the CSMA network talking to
// the first device on the hub node, etc. So the ith fillNode is associated
// with the hub address found on the (i / nFill)th device on the hub node.
//
ApplicationContainer fillApps;
for (uint32_t i = 0; i < fillNodes.GetN (); ++i)
{
AddressValue remoteAddress (InetSocketAddress (hubAddresses.GetAddress (i / nFill), port));
onOffHelper.SetAttribute ("Remote", remoteAddress);
fillApps.Add (onOffHelper.Install (fillNodes.Get (i)));
}
fillApps.Start (Seconds (1.0));
fillApps.Stop (Seconds (10.0));
NS_LOG_INFO ("Enable static global routing.");
//
// Turn on global static routing so we can actually be routed across the star.
//
GlobalRouteManager::PopulateRoutingTables ();
NS_LOG_INFO ("Enable pcap tracing.");
//
// Do pcap tracing on all devices on all nodes.
//
PointToPointHelper::EnablePcapAll ("csma-star");
NS_LOG_INFO ("Run Simulation.");
Simulator::Run ();
Simulator::Destroy ();
NS_LOG_INFO ("Done.");
return 0;
}

4
examples/wscript
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@@ -76,6 +76,10 @@ def build(bld):
['point-to-point', 'internet-stack'])
obj.source = 'star.cc'
obj = bld.create_ns3_program('csma-star',
['csma', 'internet-stack'])
obj.source = 'csma-star.cc'
obj = bld.create_ns3_program('wifi-adhoc',
['core', 'simulator', 'mobility', 'wifi'])
obj.source = 'wifi-adhoc.cc'

13
src/helper/csma-helper.cc
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@@ -199,6 +199,19 @@ CsmaHelper::Install (const NodeContainer &c, Ptr<CsmaChannel> channel)
return container;
}
void
CsmaHelper::InstallStar (Ptr<Node> hub, NodeContainer spokes,
NetDeviceContainer& hubDevices, NetDeviceContainer& spokeDevices)
{
for (uint32_t i = 0; i < spokes.GetN (); ++i)
{
NodeContainer nodes (hub, spokes.Get (i));
NetDeviceContainer nd = Install (nodes);
hubDevices.Add (nd.Get (0));
spokeDevices.Add (nd.Get (1));
}
}
void
CsmaHelper::EnqueueEvent (Ptr<PcapWriter> writer, Ptr<const Packet> packet)
{

33
src/helper/csma-helper.h
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@@ -179,6 +179,39 @@ public:
*/
NetDeviceContainer Install (const NodeContainer &c, Ptr<CsmaChannel> channel);
/**
* \brief Make a star network topology.
*
* Given a pointer to a node that will become the hub of the star, and a
* NodeContainer containing pointers to the nodes that will become the
* spokes; we construct CSMA net devices on the hub (corresponding to the
* spokes) and store them in the hubDevices NetDeviceContainer. We add a
* net device to each spoke node and store them in the spokeDevices
* NetDeviceContainer. A CSMA is created for each spoke.
*
* Usually when one thinks of a star network, one thinks of point-to-point
* links. We're just using a single pair of devices on a multi-point-to-point
* network "drops" as the link. You are free to add any number of other
* devices on the link if you want.
*
* The ordering of the devices in the hubDevices container is according to
* the order of the spokes container -- that is, hubDevices[0] will be the
* net device used on the hub that talks to spokes[0]. the container entry
* spokeDevices[0] will have the device that hubDevices[0] talks to -- those
* two devices are the ones that connect hub to spokes[0].
*
* \param hub The central node of the star network
* \param spokes A NodeContainer of the nodes that will be the spoke (leaf)
* nodes
* \param hubDevices A NetDeviceContainer that will be filled with pointers
* to the point-to-point net devices created on the hub.
* \param spokeDevices A NetDeviceContainer that will be filled with pointers
* to the point-to-point net devices created on each of
* the spokes.
*/
void InstallStar (Ptr<Node> hub, NodeContainer spokes,
NetDeviceContainer& hubDevices, NetDeviceContainer& spokeDevices);
private:
static void RxEvent (Ptr<PcapWriter> writer, Ptr<const Packet> packet);
static void EnqueueEvent (Ptr<PcapWriter> writer, Ptr<const Packet> packet);