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basic dynamic routing with OSPF

2routers-ospf-2023

 

  1. maak de hogere topologie in packettracer;
    gebruik cisco 1941 routers
     
  2. geef ip adressen
     
    • PC1: 192.168.1.1/24
    • PC3: 192.168.3.1/24
    • R1 - gi0/0: 192.168.1.254/24
    • R1 - se0/0/0: 10.255.255.5/30 - clock 64000
    • R3 - gi0/0: 192.168.3.254
    • R3 - se0/0/0: 10.255.255.6/30
       

  3. kijk naar de net-identifiers en zet ze om naar OSPF wildcard formaat
     

    • trek de netmask decimaal af van 255.255.255.255 (of draai alle bits om)
    • 10.255.255.4/30 >> 10.255.255.4 0.0.0.3
      ( 255.255.255.255 - 255.255.255.252)
    • 192.168.3.0/24 >> 192.168.3.0 0.0.0.255
    • 192.168.1.0/24 >> 192.168.1.0 0.0.0.255
    makkelijk: netmask naar wildcard
-------------------------------
   255.255.255.255   grondtal
-  255.255.255.  0   netmask
------------------
     0.  0.  0.255   wildcard
  
  
binair: netmask naar wildcard
-------------------------------
255.255.255.0 =
  
11111111.11111111.11111111.00000000
  
wildcard = (bits omdraaien 0 wordt 1 en 1 wordt 0)
  
00000000.00000000.00000000.11111111

     

  4. configureer ospf op beide routers 
    hostname R1
router ospf 1
network 10.255.255.4 0.0.0.3 area 0
network 192.168.1.0 0.0.0.255 area 0
    hostname R3
router ospf 1
network 10.255.255.4 0.0.0.3 area 0
network 192.168.3.0 0.0.0.255 area 0

     

  5. test met een ping van PC1 naar PC3 
    PC>ping 192.168.3.1
 
Pinging 192.168.3.1 with 32 bytes of data:
 
Request timed out.
Reply from 192.168.3.1: bytes=32 time=1ms TTL=126
Reply from 192.168.3.1: bytes=32 time=1ms TTL=126
Reply from 192.168.3.1: bytes=32 time=3ms TTL=126

     

  6. show commands
     
    R1#sh ip route 
    Gateway of last resort is not set
 
 10.0.0.0/30 is subnetted, 1 subnets
C       10.255.255.4 is directly connected, Serial0/0/1
C    192.168.1.0/24 is directly connected, FastEthernet0/0
O    192.168.3.0/24 [110/65] via 10.255.255.6, 00:20:06, Serial0/0/1

     
    R1#show ip ospf database

            OSPF Router with ID (192.168.1.254) (Process ID 1)
 
            Router Link States (Area 0)
 
Link ID         ADV Router      Age         Seq#       Checksum Link count
192.168.1.254   192.168.1.254   1270        0x80000003 0x00e60a 3
192.168.3.254   192.168.3.254   1227        0x80000003 0x0001ea 3

     
    R1#show ip ospf neighbor

    Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.3.254     0   FULL/  -        00:00:35    10.255.255.6    Serial0/0/1

  7. download de oplossing:
      R1 config:

    basic-ospf-r1

    R3 config:

    r3

    packettracer -- basic-ospf-1

  8. OEFENING:
      
    start-situatie: ospf-2-routers
     
    voeg een derde router, R2 (ISR4331), toe -- hang deze op de tweede seriele poort van R1;
    configureer de seriele interfaces op R1 en R2 (zoek zelf de interface naam op). Zorg dat alle PC's mekaar kunnen pingen.
    ospf-derde-router

    check daarna OSPF-neighbors en OSPF-database op alle routers.
     
    een mogelijke oplossing: ospf1
     
    teacher's layout PT okt 2023 antwerpen

    config-bert-okt-2023-pt-layout
    config-bert-okt-2023-ospf-configs

     

  9. neighbors & database
      
    =============================================================================
R1>sh ip ospf neighbor 
 
Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.3.254     0   FULL/  -        00:00:39    10.255.255.6    Serial0/0/0
192.168.2.254     0   FULL/  -        00:00:39    10.255.255.2    Serial0/0/1
------------------------------------------------------------------------------
R1>sh ip ospf database 
 
OSPF Router with ID (192.168.1.254) (Process ID 1)
Router Link States (Area 0)
 
Link ID         ADV Router      Age         Seq#       Checksum Link count
192.168.2.254   192.168.2.254   731         0x80000004 0x00f8fc 3
192.168.3.254   192.168.3.254   731         0x80000004 0x00e00a 3
192.168.1.254   192.168.1.254   731         0x80000006 0x004b87 5
=============================================================================
R2> show ip ospf neighbor 
 
Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.1.254     0   FULL/  -        00:00:38    10.255.255.1    Serial0/1/0
------------------------------------------------------------------------------
R2#show ip ospf database 
            
OSPF Router with ID (192.168.2.254) (Process ID 1)
Router Link States (Area 0)
 
Link ID         ADV Router      Age         Seq#       Checksum Link count
192.168.2.254   192.168.2.254   829         0x80000004 0x00f8fc 3
192.168.3.254   192.168.3.254   829         0x80000004 0x00e00a 3
192.168.1.254   192.168.1.254   830         0x80000006 0x004b87 5
============================================================================
R3> sh ip ospf neighbor 
 
Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.1.254     0   FULL/  -        00:00:39    10.255.255.5    Serial0/0/0
------------------------------------------------------------------------------
R3>sh ip ospf database 
        OSPF Router with ID (192.168.3.254) (Process ID 1)
 
            Router Link States (Area 0)
 
Link ID         ADV Router      Age         Seq#       Checksum Link count
192.168.3.254   192.168.3.254   892         0x80000004 0x00e00a 3
192.168.1.254   192.168.1.254   892         0x80000006 0x004b87 5
192.168.2.254   192.168.2.254   892         0x80000004 0x00f8fc 3
============================================================================