Cisco: OSPF Sederhana

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Router1:


enable
configure terminal
  interface ethernet1/1
    ip address 10.10.1.1 255.255.255.252
    no shutdown
    exit
  interface ethernet1/2
    ip address 10.10.1.5 255.255.255.252
    no shutdown
    exit
  !
  ! NAT GNS3 gw 192.168.122.1
  interface ethernet1/3
    ip address 192.168.122.100 255.255.255.0
    ip address 192.168.122.101 255.255.255.0 secondary
    ip address 192.168.122.102 255.255.255.0 secondary
    ip nat outside
    no shutdown
    ip route 0.0.0.0 0.0.0.0 192.168.122.1
    ip nat pool no-overload 192.168.122.100 192.168.122.102 prefix 24
    ip nat inside source list 7 pool no-overload 


  ip route 192.168.2.0 255.255.255.0 172.16.1.2
  !
  ! access NAT permit ke LAN 192.168.1.0/24 & 192.168.2.0/24
  ! 192.168.2.0/24 berada di R2
  access-list 7 permit 192.168.1.0 0.0.0.255
  access-list 7 permit 192.168.2.0 0.0.0.255
  exit


/ip address add address=10.10.1.1/30 interface=ether1
/ip address add address=10.10.1.5/30 interface=ether2
/ip address add address=210.13.1.0/28 interface=ether3  # kalau ether3 statik
/ip dhcp-client add interface=ether3 disabled=no        # kalau ether3 DHCP client
/ip firewall nat add chain=srcnat out-interface=ether3 action=masquareade
/ip firewall nat print


Router2:

/ip address add address=10.10.1.6/30 interface=ether1
/ip address add address=10.10.1.9/30 interface=ether2
/ip address add address=172.16.1.1/16 interface=ether3

Router3:

/ip address add address=10.10.1.2/30 interface=ether1
/ip address add address=10.10.1.10/30 interface=ether2
/ip address add address=192.168.1.1/24 interface=ether3


Ada tiga (3) elemen dasar konfigurasi OSPF:

  • Enable OSPF instance
  • OSPF area configuration
  • OSPF network configuration

instance name=default sudah ada, tidak perlu di tambahkan, tapi kalau perlu menambahkan caranya adalah sebagai berikut

R1:

/routing ospf instance add name=default
/routing ospf instance enable default

R2:

/routing ospf instance add name=default
/routing ospf instance enable default

R3:

/routing ospf instance add name=default
/routing ospf instance enable default

Cek

/routing ospf instance print 
Flags: X - disabled 
 0   name="default" router-id=0.0.0.0 distribute-default=never 
     redistribute-connected=as-type-1 redistribute-static=as-type-1 
     redistribute-rip=no redistribute-bgp=no redistribute-other-ospf=no 
     metric-default=1 metric-connected=20 metric-static=20 metric-rip=20 
     metric-bgp=auto metric-other-ospf=auto in-filter=ospf-in 
out-filter=ospf-out


Catatan: Ingat bahwa backbone area-id adalah 0.0.0.0.

R1

/routing ospf network add network=10.10.1.0/30 area=backbone
/routing ospf network add network=10.10.1.4/30 area=backbone 

R2

/routing ospf network add network=10.10.1.4/30 area=backbone 
/routing ospf network add network=10.10.1.8/30 area=backbone 
/routing ospf network add network=172.16.0.0/16 area=backbone 

R3

/routing ospf network add network=10.10.1.0/30 area=backbone 
/routing ospf network add network=10.10.1.8/30 area=backbone 
/routing ospf network add network=192.168.1.0/24 area=backbone

Atau kalau di aggregate

R1:

/routing ospf network add network=10.10.1.0/24 area=backbone


R2:

/routing ospf network add network=172.16.0.0/16 area=backbone
/routing ospf network add network=10.10.1.0/24 area=backbone

R3:

/routing ospf network add network=192.168.1.0/24 area=backbone
/routing ospf network add network=10.10.1.0/24 area=backbone

Verify

Cek

R1:

/routing ospf interface print
/routing ospf neighbor print
/ip route print

Lakukan yang sama untuk R2, R3





Referensi


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