OSPF Practice

Lab Diagram

172.16.1.0\24

172.16.3.0\24

172.16.2.0\24

209.168.1.0\30

192.168.2.0\24

192.168.3.0\24

Lab Objectives

  • Cable a network in accordance with the diagram given
  • Configure the hostname and interface IP addresses, or paste the initial configuration onto all devices
  • Change the router-id of R1 to 1.1.1.1 without using the router-id command, and ensure that it will always be set to this on start up
  • Configure R2's router-id (2.2.2.2) using a loopback interface
  • Ensure that R3 has its router-id (3.3.3.3) assigned without the use of any interface
  • Ensure that every router forms an adjacency and that every network is advertised throughout OSPF
  • NOTE: R1's Fa0/0 interface should not be a part of the OSPF process at all
  • Adjacencies should not be formed on any ethernet interfaces, but their networks should still be advertised by OSPF

Initial Configuration

Show/Hide
R1R2R3
  • !Configuration generated by CCNAPractice.com
  • !
  • !
  • hostname R1
  • !
  • !
  • !
  • !
  • interface Serial0/0
  •  ip address 172.16.1.1 255.255.255.0
  •  clock rate 64000
  •  no shutdown
  • !
  • interface Serial0/1
  •  ip address 172.16.3.1 255.255.255.0
  •  no shutdown
  • !
  • interface FastEthernet0/0
  •  ip address 209.168.1.1 255.255.255.252
  •  no shutdown
  • !
  • !
  • line con 0
  • !
  • end
  •  
  • !Configuration generated by CCNAPractice.com
  • !
  • !
  • hostname R2
  • !
  • !
  • !
  • !
  • interface Serial0/0
  •  ip address 172.16.2.1 255.255.255.0
  •  clock rate 64000
  •  no shutdown
  • !
  • interface Serial0/1
  •  ip address 172.16.1.2 255.255.255.0
  •  no shutdown
  • !
  • interface FastEthernet0/0
  •  ip address 192.168.2.1 255.255.255.0
  •  no shutdown
  • !
  • !
  • line con 0
  • !
  • end
  •  
  • !Configuration generated by CCNAPractice.com
  • !
  • !
  • hostname R3
  • !
  • !
  • !
  • !
  • interface Serial0/0
  •  ip address 172.16.3.2 255.255.255.0
  •  clock rate 64000
  •  no shutdown
  • !
  • interface Serial0/1
  •  ip address 172.16.2.2 255.255.255.0
  •  no shutdown
  • !
  • interface FastEthernet0/0
  •  ip address 192.168.3.1 255.255.255.0
  •  no shutdown
  • !
  • !
  • line con 0
  • !
  • end
  •  

Final Configuration

Show/Hide
R1R2R3
  • !Configuration generated by CCNAPractice.com
  • !
  • !
  • hostname R1
  • !
  • !
  • !
  • !
  • interface Loopback1
  •  ip address 1.1.1.1 255.255.255.255
  •  no shutdown
  • !
  • interface Serial0/0
  •  ip address 172.16.1.1 255.255.255.0
  •  clock rate 64000
  •  no shutdown
  • !
  • interface Serial0/1
  •  ip address 172.16.3.1 255.255.255.0
  •  no shutdown
  • !
  • interface FastEthernet0/0
  •  ip address 209.168.1.1 255.255.255.252
  •  no shutdown
  • !
  • !
  • router ospf 20
  •  network 172.16.1.0 0.0.0.255 area 0
  •  network 172.16.3.0 0.0.0.255 area 0
  • !
  • line con 0
  • !
  • end
  •  
  • !Configuration generated by CCNAPractice.com
  • !
  • !
  • hostname R2
  • !
  • !
  • !
  • !
  • interface Loopback1
  •  ip address 2.2.2.2 255.255.255.255
  •  no shutdown
  • !
  • interface Serial0/0
  •  ip address 172.16.2.1 255.255.255.0
  •  clock rate 64000
  •  no shutdown
  • !
  • interface Serial0/1
  •  ip address 172.16.1.2 255.255.255.0
  •  no shutdown
  • !
  • interface FastEthernet0/0
  •  ip address 192.168.2.1 255.255.255.0
  •  no shutdown
  • !
  • !
  • router ospf 30
  •  passive-interface FastEthernet0/0
  •  network 172.16.2.0 0.0.0.255 area 0
  •  network 172.16.1.0 0.0.0.255 area 0
  •  network 192.168.2.0 0.0.0.255 area 0
  • !
  • line con 0
  • !
  • end
  •  
  • !Configuration generated by CCNAPractice.com
  • !
  • !
  • hostname R3
  • !
  • !
  • !
  • !
  • interface Serial0/0
  •  ip address 172.16.3.2 255.255.255.0
  •  clock rate 64000
  •  no shutdown
  • !
  • interface Serial0/1
  •  ip address 172.16.2.2 255.255.255.0
  •  no shutdown
  • !
  • interface FastEthernet0/0
  •  ip address 192.168.3.1 255.255.255.0
  •  no shutdown
  • !
  • !
  • router ospf 20
  •  router-id 3.3.3.3
  •  passive-interface FastEthernet0/0
  •  network 172.16.3.0 0.0.0.255 area 0
  •  network 172.16.2.0 0.0.0.255 area 0
  •  network 192.168.3.0 0.0.0.255 area 0
  • !
  • line con 0
  • !
  • end
  •  

2 thoughts on “OSPF Practice

  1. Leah

    QQ–In R1 you have listed that the OSPF instance is 40 yet the other 2 say 50. Is there a reason or is it a typo? I thought it had to be same instance.

    Thanks

    Reply
    1. stuart Post author

      Hi Leah,

      The OSPF instance numbers are only locally significant, so they can differ or be the same between routers.

      Reply

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