Step 17a. Make R3 an ABR - advertise its loopback to backbone¶

Goals¶

[explanation]

Configuration¶

This configuration is based on step 17.

The configuration in omnetpp.ini is the following:

[Config Step17a]
description = "Make R3 an ABR - advertise its loopback to backbone"
extends = Step17

*.R*.ospf.ospfConfig = xmldoc("ASConfig_Area_Loop_ABR.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>R2" mask="R1>R2" />
    <AddressRange address="R2>R1" mask="R2>R1" />
    <AddressRange address="127.0.0.1" mask="255.0.0.0" />
  </Area>

  <Area id="0.0.0.1">
    <AddressRange address="R1>R5" mask="R1>R5" />
    <AddressRange address="R1>switch1" mask="R1>switch1" />      
    
    <AddressRange address="R5>R1" mask="R5>R1" />
    <AddressRange address="R5>R3" mask="R5>R3" />        
    <AddressRange address="R5>switch5" mask="R5>switch5" />
    
    <AddressRange address="R3>R5" mask="R3>R5" />
    <AddressRange address="R3>switch3" mask="R3>switch3" />
  </Area>

  <Area id="0.0.0.2">
    <AddressRange address="R2>switch2" mask="R2>switch2" />
    <AddressRange address="R2>R4" mask="R2>R4" />        
    <AddressRange address="R2>R3" mask="R2>R3" />
    
    <AddressRange address="R4>switch4" mask="R4>switch4" />
    <AddressRange address="R4>R2" mask="R4>R2" />        
    <AddressRange address="R4>R3" mask="R4>R3" />    
        
    <AddressRange address="R3>R2" mask="R3>R2" />
    <AddressRange address="R3>R4" mask="R3>R4" />
    <AddressRange address="R3>switch6" mask="R3>switch6" />
  </Area>

  <!-- Routers -->
  <Router name="R1" RFC1583Compatible="true">
    <BroadcastInterface ifName="eth0" areaID="0.0.0.1" interfaceMode="Passive" />
    <BroadcastInterface ifName="eth1" areaID="0.0.0.1" />
    <BroadcastInterface ifName="eth2" areaID="0.0.0.0" />
  </Router>

  <Router name="R2" RFC1583Compatible="true">
    <BroadcastInterface ifName="eth1" areaID="0.0.0.2" interfaceMode="Passive" />
    <BroadcastInterface ifName="eth0" areaID="0.0.0.2" />
    <BroadcastInterface ifName="eth2" areaID="0.0.0.2" />
    <BroadcastInterface ifName="eth3" areaID="0.0.0.0" />
  </Router>

  <Router name="R3" RFC1583Compatible="true">
    <BroadcastInterface ifName="eth0" areaID="0.0.0.2" />
    <BroadcastInterface ifName="eth1" areaID="0.0.0.2" />
    <BroadcastInterface ifName="eth2" areaID="0.0.0.1" />
    <BroadcastInterface ifName="eth3" areaID="0.0.0.1" interfaceMode="Passive" />
    <BroadcastInterface ifName="eth4" areaID="0.0.0.2" interfaceMode="Passive" />
    <LoopbackInterface ifName="lo0" areaID="0.0.0.0" />
  </Router>

  <Router name="R4" RFC1583Compatible="true">
    <BroadcastInterface ifName="eth0" areaID="0.0.0.2" />
    <BroadcastInterface ifName="eth1" areaID="0.0.0.2" />
    <BroadcastInterface ifName="eth2" areaID="0.0.0.2" interfaceMode="Passive" />
  </Router>

  <Router name="R5" RFC1583Compatible="true">
    <BroadcastInterface ifName="eth0" areaID="0.0.0.1" interfaceMode="Passive" />
    <BroadcastInterface ifName="eth1" areaID="0.0.0.1" />
    <BroadcastInterface ifName="eth2" areaID="0.0.0.1" />
  </Router>

</OSPFASConfig>

Results¶

[explanation]

Sources: omnetpp.ini, OSPF_LoopAvoidance.ned, ASConfig_Area_Loop_ABR.xml

Discussion¶

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