Belajar Mengkonfigurasi virtual link dalam OSPF pada perangkat Cisco Router By:Daywalker@Datakom-C223 http://www.ittelkom.ac.id/pinguin http://iwing.wordpress.com
Pada saat belajar Routing Protocol, khusus nya OSPF kita pasti akan dihadapkan dengan konsep Area, dimana setiap area harus terhubung secara fisik dengan area 0 (backbone area) terlihat seperti gambar topology 1 dibawah. Akan tetapi bagaimana jika suatu area tidak dapat terhubung langsung dengan area 0 seperti gambar topology 2 dibawah ini.
Gambar 1
Gambar 2
Pada kesempatan ini kita akan belajar bagaimana cara mengatasi masalah tersebut dengan menggunakan virtual link. Nb: virtual links are a design nightmare and are best avoided. Konfigurasi di tiap router : ################################################ cnc1# !
hostname cnc1 ! ip subnet-zero ip cef !
interface Loopback0 ip address 10.10.10.1 255.255.255.255 ! interface FastEthernet0/0 ip address 192.168.10.65 255.255.255.252 duplex auto speed auto ! interface FastEthernet0/1 ip address 192.168.10.6 255.255.255.252 duplex auto speed auto ! router ospf 1 log-adjacency-changes area 1 virtual-link 10.10.10.2 network 10.10.10.1 0.0.0.0 area 1 network 192.168.10.4 0.0.0.3 area 2 network 192.168.10.64 0.0.0.3 area 1 ! cnc1#
################################################ ################################################ cnc2# ! hostname cnc2 ! ip subnet-zero ! ip cef !
interface Loopback0 ip address 10.10.10.2 255.255.255.255 ! interface FastEthernet0/0 ip address 192.168.10.66 255.255.255.252 duplex auto speed auto ! interface FastEthernet0/1 ip address 192.168.10.69 255.255.255.252 duplex auto speed auto
! interface FastEthernet2/0 no ip address duplex auto speed auto ! interface FastEthernet2/0.1 encapsulation dot1Q 1 native ip address 192.168.10.97 255.255.255.224 ! interface FastEthernet2/0.10 encapsulation dot1Q 10 ip address 192.168.10.129 255.255.255.224 ! interface FastEthernet2/0.20 encapsulation dot1Q 20 ip address 192.168.10.161 255.255.255.224 ! interface FastEthernet2/0.30 encapsulation dot1Q 30 ip address 192.168.10.193 255.255.255.224 ! interface FastEthernet2/0.40 encapsulation dot1Q 40 ip address 192.168.10.225 255.255.255.224 !
router ospf 1 log-adjacency-changes area 1 virtual-link 10.10.10.1 network 10.10.10.2 0.0.0.0 area 1 network 192.168.10.64 0.0.0.3 area 1 network 192.168.10.68 0.0.0.3 area 0 network 192.168.10.96 0.0.0.31 area 0 network 192.168.10.128 0.0.0.31 area 0 network 192.168.10.160 0.0.0.31 area 0 network 192.168.10.192 0.0.0.31 area 0 network 192.168.10.224 0.0.0.31 area 0 cnc2#
################################################ ################################################ cnc3# ! hostname cnc3 ! ip cef !
interface Loopback0 ip address 10.10.10.3 255.255.255.255 ! interface FastEthernet0/0 ip address 192.168.10.70 255.255.255.252 duplex auto speed auto ! interface FastEthernet0/1 ip address 192.168.10.33 255.255.255.224 duplex auto speed auto ! router ospf 1 log-adjacency-changes
network 10.10.10.3 0.0.0.0 area 0 network 192.168.10.32 0.0.0.31 area 0 network 192.168.10.68 0.0.0.3 area 0 cnc3#
################################################ ################################################ cnc4# ! ip subnet-zero !
interface Loopback0 ip address 10.10.10.4 255.255.255.255 ! interface FastEthernet0 ip address 192.168.10.5 255.255.255.252 duplex auto speed auto ! router ospf 1 log-adjacency-changes network 10.10.10.4 0.0.0.0 area 2 network 192.168.10.4 0.0.0.3 area 2 ! cnc4#
################################################ Untuk mengkonfigurasi Virtual link konfigurasi umumnya adalah : Router(config-router)#router ospf process-id Router(config-router)#router Router(config-router)# Router(config-ro uter)# area area-id virtual-link router-id
(Dimana, area-id adalah transit area, router-id adalah RID dari Router ABR) Dalam kasus saya konfigurasinya menjadi : cnc1(config-router)#router ospf 1 cnc1(config-router)#router cnc1(config-router)#area 1 virtual-link 10.10.10.2 cnc2(config-router)#router ospf 1 cnc2(config-router)#router cnc2(config-router)#area 1 virtual-link 10.10.10.1
Untuk pengujian :
Gambar 3
Gambar 4
Gamabar 5
Gambar 6
Gambar 7
Gambar 8
Gambar 9
Gambar 10
Alhamdullilah percobaan kita berjalan dengan lancar b^_^d Ref: http://www.cisco.com ############Sekian dulu teman-teman semoga bermanfaat############
