Step 22. Virtual link - connect a disconnected area to the backbone¶

Goals¶

[explanation]

Configuration¶

This step uses the following network:

network VirtualLink_2
{
    @display("bgb=1421.8575,584.4563");

    types:
        channel PppLink100M extends DatarateChannel
        {
            delay = 5us;
            datarate = 100Mbps;
        }

    submodules:
        configurator: Ipv4NetworkConfigurator {
            @display("p=136.23125,61.399998");
        }
        visualizer: IntegratedCanvasVisualizer {
            @display("p=136.05376,208.87126");
        }
        scenarioManager: ScenarioManager {
            @display("p=136.05376,360.255");
        }
        R3: Router {
            @display("p=703.2638,465.64877");
        }
        R1: Router {
            @display("p=904.47003,260.61002");
        }
        switch3: EtherSwitch {
            @display("p=448.40253,463.7325");
        }
        switch1: EtherSwitch {
            @display("p=904.47003,47.906254");
        }
        R2: Router {
            @display("p=1052.0212,465.64877");
        }
        switch2: EtherSwitch {
            @display("p=1306.8826,463.7325");
        }
    connections:
        R3.ethg++ <--> Eth100M <--> switch3.ethg++;
        R1.ethg++ <--> Eth100M <--> switch1.ethg++;
        R2.ethg++ <--> Eth100M <--> switch2.ethg++;
        R1.pppg++ <--> PppLink100M <--> R2.pppg++;
        R2.pppg++ <--> PppLink100M <--> R3.pppg++;
}

The configuration in omnetpp.ini is the following:

[Config Step22]
description = "Virtual link - connect a disconnected area to the backbone"
network = VirtualLink_2

*.R*.ospf.ospfConfig = xmldoc("ASConfig_Virtual_Disconnected.xml")

The OSPF configuration:

<?xml version="1.0"?>
<OSPFASConfig xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="OSPF.xsd">

  <!-- Areas -->
  <Area id="0.0.0.0">
    <AddressRange address="R1>switch1" mask="R1>switch1" />
  </Area>

  <Area id="0.0.0.1">
    <AddressRange address="R1>R2" mask="R1>R2" />
    
    <AddressRange address="R2>R1" mask="R2>R1" />    
    <AddressRange address="R2>R3" mask="R2>R3" />   
    <AddressRange address="R2>switch2" mask="R2>switch2" />   
  </Area>
  
  <Area id="0.0.0.2">       
    <AddressRange address="R3>switch3" mask="R3>switch3" />   
  </Area>

  <!-- Routers -->
  <Router name="R1" RFC1583Compatible="true">
    <BroadcastInterface ifName="eth0" areaID="0.0.0.0" interfaceMode="Passive" />
    <PointToPointInterface ifName="ppp0" areaID="0.0.0.1" />
    <VirtualLink endPointRouterID="R3%routerId" transitAreaID="0.0.0.1" />
  </Router>

  <Router name="R2" RFC1583Compatible="true">
    <BroadcastInterface ifName="eth0" areaID="0.0.0.1" interfaceMode="Passive" />
    <PointToPointInterface ifName="ppp0" areaID="0.0.0.1" />
    <PointToPointInterface ifName="ppp1" areaID="0.0.0.1" />
  </Router>
  
  <Router name="R3" RFC1583Compatible="true">
    <BroadcastInterface ifName="eth0" areaID="0.0.0.2" interfaceMode="Passive" />
    <PointToPointInterface ifName="ppp0" areaID="0.0.0.1" />
    <VirtualLink endPointRouterID="R1%routerId" transitAreaID="0.0.0.1" />
  </Router>

</OSPFASConfig>

Results¶

[explanation]

Sources: omnetpp.ini, VirtualLink_2.ned, ASConfig_Virtual_Disconnected.xml

Discussion¶

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