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internet: Add EcmpRouteCalculation testcase for GlobalRouting

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This commit is contained in:
shashwat
2025-06-20 00:50:05 +05:30
parent ad089436ac
commit 5cc5c00619
1 changed files with 121 additions and 0 deletions
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121
src/internet/test/ipv4-global-routing-test-suite.cc
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@@ -1276,6 +1276,126 @@ Ipv4GlobalRoutingSlash32TestCase::DoRun()
Simulator::Destroy();
}
/**
* @ingroup internet-test
*
* @brief This TestCase tests if ECMP Route Calculation works. It does not check the
* correctness of the routes.
*/
class EcmpRouteCalculationTestCase : public TestCase
{
public:
EcmpRouteCalculationTestCase();
void DoSetup() override;
void DoRun() override;
private:
NodeContainer nodes; //!< Nodes used in the test.
};
EcmpRouteCalculationTestCase::EcmpRouteCalculationTestCase()
: TestCase("ECMP Route Calculation TestCase")
{
}
void
EcmpRouteCalculationTestCase::DoSetup()
{
/*
This TestCase checks the resolution of issue #1243 in the issue tracker.
The problem was that Global Routing failed to calculate next hops when going from a
network vertex to a router vertex when ECMP Routes were involved.
// Network Topology
//
//
// ------n1------
// / \
// / \
// n0 n3----n4----n5
// \ /
// \ /
// ------n2------
//
// Link n0-n1: 10.1.1.1/30,10.1.1.2/30
// Link n0-n2: 10.1.2.1/30,10.1.2.2/30
// Link n1-n3: 10.1.3.1/30,10.1.3.2/30
// Link n2-n3: 10.1.4.1/30,10.1.4.2/30
// Link n3-n4: 10.1.5.1/24,10.1.5.2/24
// Link n4-n5: 10.1.6.1/24,10.1.6.2/24
//
// Note: Link n4-n5 is a LAN LINK. All others are simple P2P links.
*/
nodes.Create(6);
Ipv4GlobalRoutingHelper globalhelper;
InternetStackHelper stack;
stack.SetRoutingHelper(globalhelper);
stack.Install(nodes);
SimpleNetDeviceHelper devHelper;
devHelper.SetNetDevicePointToPointMode(true);
Ptr<SimpleChannel> channel1 = CreateObject<SimpleChannel>();
NetDeviceContainer d01 = devHelper.Install(nodes.Get(0), channel1);
d01.Add(devHelper.Install(nodes.Get(1), channel1));
Ptr<SimpleChannel> channel2 = CreateObject<SimpleChannel>();
NetDeviceContainer d23 = devHelper.Install(nodes.Get(2), channel2);
d23.Add(devHelper.Install(nodes.Get(3), channel2));
Ptr<SimpleChannel> channel3 = CreateObject<SimpleChannel>();
NetDeviceContainer d02 = devHelper.Install(nodes.Get(0), channel3);
d02.Add(devHelper.Install(nodes.Get(2), channel3));
Ptr<SimpleChannel> channel4 = CreateObject<SimpleChannel>();
NetDeviceContainer d34 = devHelper.Install(nodes.Get(3), channel4);
d34.Add(devHelper.Install(nodes.Get(4), channel4));
Ptr<SimpleChannel> channel5 = CreateObject<SimpleChannel>();
NetDeviceContainer d13 = devHelper.Install(nodes.Get(1), channel5);
d13.Add(devHelper.Install(nodes.Get(3), channel5));
devHelper.SetNetDevicePointToPointMode(false);
Ptr<SimpleChannel> channel6 = CreateObject<SimpleChannel>();
NetDeviceContainer d45 = devHelper.Install(nodes.Get(4), channel6);
d45.Add(devHelper.Install(nodes.Get(5), channel6));
// Assign IP addresses to the devices
Ipv4AddressHelper address;
address.SetBase("10.1.1.0", "255.255.255.252");
Ipv4InterfaceContainer i01 = address.Assign(d01);
address.SetBase("10.1.2.0", "255.255.255.252");
Ipv4InterfaceContainer i02 = address.Assign(d02);
address.SetBase("10.1.3.0", "255.255.255.252");
Ipv4InterfaceContainer i13 = address.Assign(d13);
address.SetBase("10.1.4.0", "255.255.255.224");
Ipv4InterfaceContainer i23 = address.Assign(d23);
address.SetBase("10.1.5.0", "255.255.255.0");
Ipv4InterfaceContainer i34 = address.Assign(d34);
address.SetBase("10.1.6.0", "255.255.255.0");
Ipv4InterfaceContainer i45 = address.Assign(d45);
}
void
EcmpRouteCalculationTestCase::DoRun()
{
// The purpose of this test is to make sure the code doesn't crash when calculating ECMP routes
// with a topology described in issue #1243. It does not look into the correctness of the
// routes. We have other tests to make sure the routes are correct.
Ipv4GlobalRoutingHelper::PopulateRoutingTables();
Simulator::Run();
Simulator::Stop(Seconds(2));
Simulator::Destroy();
}
/**
* @ingroup internet-test
*
@@ -1298,6 +1418,7 @@ Ipv4GlobalRoutingTestSuite::Ipv4GlobalRoutingTestSuite()
AddTestCase(new TwoBridgeTest, TestCase::Duration::QUICK);
AddTestCase(new Ipv4DynamicGlobalRoutingTestCase, TestCase::Duration::QUICK);
AddTestCase(new Ipv4GlobalRoutingSlash32TestCase, TestCase::Duration::QUICK);
AddTestCase(new EcmpRouteCalculationTestCase, TestCase::Duration::QUICK);
}
static Ipv4GlobalRoutingTestSuite