bxm's IT Story
가상 링크 (Virtual Link) 본문
## Virtual link ##
공통]
conf t
no ip domain lookup
line c 0
logg sy
exec-timeout 0
exit
line vty 0 4
pass cisco
end
R1]
conf t
int lo0
ip add 1.1.1.1 255.255.255.0
exit
int f0/1
no shut
ip add 1.1.12.1 255.255.255.0
exit
int f0/0
no shut
ip add 1.1.13.1 255.255.255.0
end
R2]
conf t
int lo0
ip add 1.1.2.2 255.255.255.0
exit
int f0/1
no shut
ip add 1.1.12.2 255.255.255.0
exit
int f0/0
no shut
ip add 1.1.23.2 255.255.255.0
end
R3]
conf t
int lo0
ip add 1.1.3.3 255.255.255.0
exit
int f0/0
no shut
ip add 1.1.13.3 255.255.255.0
exit
int f0/1
no shut
ip add 1.1.23.3 255.255.255.0
exit
int f1/0
no shut
ip add 1.1.34.3 255.255.255.0
end
R4]
conf t
int lo0
ip add 1.1.4.4 255.255.255.0
exit
int f0/0
no shut
ip add 1.1.34.4 255.255.255.0
exit
## Ping 날리기 ##
R1]
ping 1.1.12.2
ping 1.1.13.3
R2]
ping 1.1.23.3
R3]
ping 1.1.34.4
## OSPF 돌리기 ##
R1]
conf t
router ospf 1
router-id 1.1.1.1
network 1.1.1.1 0.0.0.0 area 0
network 1.1.12.1 0.0.0.0 area 0
network 1.1.13.1 0.0.0.0 area 2
exit
int lo0
ip os net point-to-p
end
R2]
conf t
router ospf 1
router-id 1.1.2.2
network 1.1.2.2 0.0.0.0 area 0
network 1.1.12.2 0.0.0.0 area 0
network 1.1.23.2 0.0.0.0 area 2
exit
int lo0
ip os net point-to-p
end
R3]
conf t
router ospf 1
router-id 1.1.3.3
network 1.1.3.3 0.0.0.0 area 3
network 1.1.34.3 0.0.0.0 area 3
network 1.1.13.3 0.0.0.0 area 2
network 1.1.23.3 0.0.0.0 area 2
exit
int lo0
ip os net point-to-p
end
R4]
conf t
router ospf 1
router-id 1.1.4.4
network 1.1.4.4 0.0.0.0 area 3
network 1.1.34.4 0.0.0.0 area 3
exit
int lo0
ip os net point-to-p
end
공통]
show ip ospf nei
## 문제는 Area 3번이 R1]으로 넘어올까? --> 넘어오지 않음.
## 왜? Backbone Area 0은 중앙에 있어야 하는데 Area 0 과 Area 3은 서로 떨어져 있음!!
그래서 가상 링크를 맺어줘야한다!!
R1]
conf t
router ospf 1
area 2 virtual-link 1.1.3.3
end
## Area 2가 트랜짓 area(지나치는 area)가 되고, Area 0 과, Area 3이 강제로 맺어줌.
R2]
conf t
router ospf 1
area 2 virtual-link 1.1.3.3
end
R3]
conf t
router ospf 1
area 2 virtual-link 1.1.1.1
area 2 virtual-link 1.1.2.2
end
## 만약에 R3의 lo0가 Area 2에 있으면 Link를 Area3에 있는 R3의 f1/0을 잡아줘야 한다!! !!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!
## 그러면 이제 Virtual Link 까지 Neighbor가 늘어나게 된다 ##
R1, R2, R3]
show ip ospf nei
R1]
show ip route
끝!
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