#####
OSPF kepanjangan dari Open Shothest Path First adalah salah satu Routing protokol pada kebanyakan Router yang berfungsi untuk mendistribusikan informasi jaringan dari satu Router ke Router lainnya. Dengan menggunakan OSPF pada jaringan kita dapat mengaktifkan dynamic routing sehingga dalam konfigurasi routing tidak seribet Static Routing.
OSPF merupakan protokol IGP (Interior Gateway routing Protocol) yang artinya OSPF hanya dapat mendistribusikan informasi Routing dalam satu AS yang sama saja, setiap informasi routing dalam OSPF disebut dengan LSA (Link State Advertisement), sekumpulan LSA tersebut disimpan dalam LSDB (Link State Database) setiap Router.
Tools yang saya gunakan:
1. Aplikasi GNS3 (Karena Lebih Real Ketimbang Packet Tracert)
2. Cisco Router 7200
Cisco IOS Software, 7200 Software (C7200-ADVENTERPRISEK9-M)
Version 12.4(24)T5
3. Cisco 3600 (L3 & L2)
Cisco IOS Software, 3600 Software (C3660-A3JK9S-M)
This is a normal Router with a SW module inside (NM-16ESW)
Version 12.4(25d)
Topology yang saya buat, ada 4 Buah Router Cisco 7200 dan Switch L2-L3 Cisco 3600 untuk Test failed over Link
Temukan Artikel lainnya terkait Routing dan Switching di List All Articles Routing & Switching CIENA/CISCO/RAISECOM/BROCADE in This Blog [Updated]
Konfigurasi di 4 Router Cisco 7200
Konfigurasi di Router 1 Cisco 7200
R1-Cisco7200#
interface GigabitEthernet0/0
description TO-R2
ip address 10.10.10.1 255.255.255.252
no ip redirects
no ip unreachables
ip ospf network point-to-point
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet1/0
description TO-L2-A
no ip address
negotiation auto
!
interface GigabitEthernet1/0.100
description VLAN-100
encapsulation dot1Q 100
ip address 192.168.100.1 255.255.255.0
!
interface GigabitEthernet2/0
description TO-R4
ip address 30.30.30.1 255.255.255.252
no ip redirects
no ip unreachables
ip ospf network point-to-point
negotiation auto
!
router ospf 1
log-adjacency-changes
passive-interface default
no passive-interface GigabitEthernet0/0
no passive-interface GigabitEthernet2/0
network 10.10.10.0 0.0.0.3 area 0
network 30.30.30.0 0.0.0.3 area 0
network 192.168.100.0 0.0.0.3 area 0
network 192.168.200.0 0.0.0.3 area 0
R1-Cisco7200#show interfaces description
Interface Status Protocol Description
Et0/0 admin down down
Gi0/0 up up TO-R2
Gi1/0 up up TO-L2-A
Gi1/0.100 up up VLAN-100
Gi2/0 up up TO-R4
R1-Cisco7200#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 unassigned YES NVRAM administratively down down
GigabitEthernet0/0 10.10.10.1 YES NVRAM up up
GigabitEthernet1/0 unassigned YES NVRAM up up
GigabitEthernet1/0.100 192.168.100.1 YES NVRAM up up
GigabitEthernet2/0 30.30.30.1 YES NVRAM up up
Cek Status OSFP-nya apakah Full atau tidak
R1-Cisco7200#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
50.50.50.2 0 FULL/ - 00:00:34 30.30.30.2 GigabitEthernet2/0
40.40.40.1 0 FULL/ - 00:00:39 10.10.10.2 GigabitEthernet0/0
Konfigurasi di Router 2 Cisco 7200
R2-Cisco7200#
interface GigabitEthernet0/0
description TO-R1
ip address 10.10.10.2 255.255.255.252
no ip redirects
no ip unreachables
ip ospf network point-to-point
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet1/0
description TO-R4
ip address 40.40.40.1 255.255.255.252
no ip redirects
no ip unreachables
ip ospf network point-to-point
negotiation auto
!
interface GigabitEthernet2/0
description TO-R3
ip address 20.20.20.1 255.255.255.252
no ip redirects
no ip unreachables
ip ospf network point-to-point
negotiation auto
!
router ospf 1
log-adjacency-changes
passive-interface default
no passive-interface GigabitEthernet0/0
no passive-interface GigabitEthernet1/0
no passive-interface GigabitEthernet2/0
network 10.10.10.0 0.0.0.3 area 0
network 20.20.20.0 0.0.0.3 area 0
network 40.40.40.0 0.0.0.3 area 0
!
R2-Cisco7200#show interfaces description
Interface Status Protocol Description
Et0/0 admin down down
Gi0/0 up up TO-R1
Gi1/0 up up TO-R4
Gi2/0 up up TO-R3
R2-Cisco7200#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 unassigned YES NVRAM administratively down down
GigabitEthernet0/0 10.10.10.2 YES NVRAM up up
GigabitEthernet1/0 40.40.40.1 YES NVRAM up up
GigabitEthernet2/0 20.20.20.1 YES NVRAM up up
Cek Status OSFP-nya apakah Full atau tidak
R2-Cisco7200#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
50.50.50.2 0 FULL/ - 00:00:37 40.40.40.2 GigabitEthernet1/0
192.168.200.1 0 FULL/ - 00:00:38 20.20.20.2 GigabitEthernet2/0
192.168.100.1 0 FULL/ - 00:00:37 10.10.10.1 GigabitEthernet0/0
Konfigurasi di Router 3 Cisco 7200
R3-Cisco7200#
interface GigabitEthernet0/0
description TO-R2
ip address 20.20.20.2 255.255.255.252
ip ospf network point-to-point
duplex full
speed 1000
media-type gbic
negotiation auto
!
interface GigabitEthernet1/0
description TO-R4
ip address 50.50.50.1 255.255.255.252
no ip redirects
no ip unreachables
ip ospf network point-to-point
negotiation auto
!
interface GigabitEthernet2/0
description TO-L2-B
no ip address
no ip redirects
no ip unreachables
negotiation auto
!
interface GigabitEthernet2/0.200
description VLAN-200
encapsulation dot1Q 200
ip address 192.168.200.1 255.255.255.0
no ip unreachables
!
router ospf 1
log-adjacency-changes
passive-interface default
no passive-interface GigabitEthernet0/0
no passive-interface GigabitEthernet1/0
network 20.20.20.0 0.0.0.3 area 0
network 50.50.50.0 0.0.0.3 area 0
network 192.168.100.0 0.0.0.3 area 0
network 192.168.200.0 0.0.0.3 area 0
R3-Cisco7200#show interfaces description
Interface Status Protocol Description
Et0/0 admin down down
Gi0/0 up up TO-R2
Gi1/0 up up TO-R4
Gi2/0 up up TO-L2-B
Gi2/0.200 up up VLAN-200
R3-Cisco7200#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 unassigned YES NVRAM administratively down down
GigabitEthernet0/0 20.20.20.2 YES NVRAM up up
GigabitEthernet1/0 50.50.50.1 YES NVRAM up up
GigabitEthernet2/0 unassigned YES NVRAM up up
GigabitEthernet2/0.200 192.168.200.1 YES NVRAM up up
Cek Status OSFP-nya apakah Full atau tidak
R3-Cisco7200#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
50.50.50.2 0 FULL/ - 00:00:30 50.50.50.2 GigabitEthernet1/0
40.40.40.1 0 FULL/ - 00:00:31 20.20.20.1 GigabitEthernet0/0
Konfigurasi di Router 4 Cisco 7200
R4-Cisco7200#
interface GigabitEthernet0/0
description TO-R2
ip address 40.40.40.2 255.255.255.252
no ip redirects
no ip unreachables
ip ospf network point-to-point
duplex full
speed 1000
media-type gbic
negotiation auto
!
interface GigabitEthernet1/0
description TO-R3
ip address 50.50.50.2 255.255.255.252
no ip redirects
no ip unreachables
ip ospf network point-to-point
negotiation auto
!
interface GigabitEthernet2/0
description TO-R1
ip address 30.30.30.2 255.255.255.252
no ip redirects
no ip unreachables
ip ospf network point-to-point
negotiation auto
!
router ospf 1
log-adjacency-changes
passive-interface default
no passive-interface GigabitEthernet0/0
no passive-interface GigabitEthernet1/0
no passive-interface GigabitEthernet2/0
network 30.30.30.0 0.0.0.3 area 0
network 40.40.40.0 0.0.0.3 area 0
network 50.50.50.0 0.0.0.3 area 0
!
R4-Cisco7200#show interfaces description
Interface Status Protocol Description
Et0/0 admin down down
Gi0/0 up up TO-R2
Gi1/0 up up TO-R3
Gi2/0 up up TO-R1
R4-Cisco7200#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 unassigned YES NVRAM administratively down down
GigabitEthernet0/0 40.40.40.2 YES NVRAM up up
GigabitEthernet1/0 50.50.50.2 YES NVRAM up up
GigabitEthernet2/0 30.30.30.2 YES NVRAM up up
Cek Status OSFP-nya apakah Full atau tidak
R4-Cisco7200#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
192.168.200.1 0 FULL/ - 00:00:35 50.50.50.1 GigabitEthernet1/0
40.40.40.1 0 FULL/ - 00:00:31 40.40.40.1 GigabitEthernet0/0
192.168.100.1 0 FULL/ - 00:00:39 30.30.30.1 GigabitEthernet2/0
Konfigurasi disisi Switch L2-L3 Cisco 3600 Untuk Test Link dengan IP Address:
Cisco3600-L2-A#show run interface vlan 100
Building configuration...
Current configuration : 65 bytes
!
interface Vlan100
ip address 192.168.100.3 255.255.255.0
end
Cisco3600-L2-B#show run interface vlan 200
Building configuration...
Current configuration : 65 bytes
!
interface Vlan200
ip address 192.168.200.3 255.255.255.0
end
Pengetesan di Switch dengan Traceroute yang telah dipasang Interface VLAN-100 dan Interface VLAN-200 dengan Semua Link UP
Pengetesan di Switch dengan Traceroute yang telah dipasang Interface VLAN-100 dan Interface VLAN-200 dengan Test Failed Over Link (Link ada yang down) dimana Hop yang dilewati hanya 2
Cisco3600-L2-A#traceroute 192.168.200.3 (Traceroute dari Router-1 ke arah Router-3 yang beda IP Network dan Vlan)
Type escape sequence to abort.
Tracing the route to 192.168.200.3
1 192.168.100.1 16 msec 20 msec 12 msec
2 10.10.10.2 44 msec 28 msec 32 msec
3 20.20.20.2 52 msec 40 msec 40 msec
4 192.168.200.3 56 msec 56 msec 52 msec
Cisco3600-L2-B#traceroute 192.168.100.3
Type escape sequence to abort.
Tracing the route to 192.168.100.3
1 192.168.200.1 4 msec 8 msec 12 msec
2 20.20.20.1 20 msec 24 msec 28 msec
3 10.10.10.1 40 msec 40 msec 48 msec
4 192.168.100.3 52 msec 52 msec 48 msec
Pengetesan di Switch dengan Traceroute yang telah dipasang Interface VLAN-100 dan Interface VLAN-200 dengan Test Failed Over Link (Link ada yang down) dimana Hop yang dilewati menjadi 3
Dari Log yang ada ketika Link putus di Router 1 log-nya seperti ini:
R1-Cisco7200#
*Nov 9 06:59:05.495: %OSPF-5-ADJCHG: Process 1, Nbr 40.40.40.1 on GigabitEthernet0/0 from FULL to DOWN, Neighbor Down: Dead timer expired
Status OSPF Yang Up hanya 1 sekarang (sebelumnya 2)
R1-Cisco7200#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
50.50.50.2 0 FULL/ - 00:00:32 30.30.30.2 GigabitEthernet2/0
Cisco3600-L2-A#traceroute 192.168.200.3
Type escape sequence to abort.
Tracing the route to 192.168.200.3
1 192.168.100.1 12 msec 8 msec 12 msec
2 30.30.30.2 28 msec 32 msec 28 msec
3 40.40.40.1 52 msec 40 msec 40 msec
4 20.20.20.2 48 msec 52 msec 48 msec
5 192.168.200.3 100 msec 72 msec 60 msec
Dari Log yang ada ketika Link putus di Router 3 log-nya seperti ini:
R3-Cisco7200#
*Nov 9 06:59:01.611: %OSPF-5-ADJCHG: Process 1, Nbr 50.50.50.2 on GigabitEthernet1/0 from FULL to DOWN, Neighbor Down: Dead timer expired
Status OSPF Yang Up hanya 1 sekarang (sebelumnya 2)
R3-Cisco7200#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
40.40.40.1 0 FULL/ - 00:00:35 20.20.20.1 GigabitEthernet0/0
Traceroute menjadi 3 Hop
Cisco3600-L2-B#traceroute 192.168.100.3
Type escape sequence to abort.
Tracing the route to 192.168.100.3
1 192.168.200.1 12 msec 8 msec 12 msec
2 20.20.20.1 20 msec 20 msec 24 msec
3 40.40.40.2 48 msec 32 msec 28 msec
4 30.30.30.1 56 msec 40 msec 40 msec
5 192.168.100.3 60 msec 60 msec 64 msec