網絡拓撲圖
解決OSPF不連續區域的問題 我們有三種解決辦法：
1.多進程雙向重新分佈
2.創建tunnel通道 宣告到區域0
3.創建虛鏈路
以下是3種方法配置的詳細命令：
方法1：多進程雙向重新分佈
(1).重新啓動另外一個OSPF進程
(2).在2個OSPF進程中宣告不連續的網段
(3).雙向發佈OSPF進程: redistribute ospf 進程號subnets
R1
int s0/0
ip add 1.1.1.1 255.255.255.0
no shut
router ospf 110
router-id 1.1.1.1
network 1.1.1.0 0.0.0.255 area 0
R2
int s0/0
ip add 1.1.1.2 255.255.255.0
no shut
int s0/1
ip add 2.2.2.1 255.255.255.0
no shut
router ospf 110
router-id 2.2.2.2
network 2.2.2.0 0.0.0.255 area 1
network 1.1.1.0 0.0.0.255 area 0
router ospf 120
router-id 2.2.2.5
network
R3
int s0/0
ip add 2.2.2.2 255.255.255.0
no shut
int s0/1
ip add 3.3.3.1 255.255.255.0
no shut
router ospf 110
router-id 3.3.3.3
network 2.2.2.0 0.0.0.255 area 1
redistribute ospf 120 subnets
router ospf 120
router-id 3.3.3.5
network 3.3.3.0 0.0.0.255 area 2
redistribute ospf 110 subnets
R4
int s0/0
ip add 3.3.3.2 255.255.255.0
no shut
router ospf 110
router-id 4.4.4.4
network 3.3.3.0 0.0.0.255 area 2
方法2：創建tunnel通道 宣告到區域0
r1
int s0/0
ip add 1.1.1.1 255.255.255.0
no shut
router ospf 110
router-id 1.1.1.1
network 1.1.1.0 0.0.0.255 area 0
r2
int s0/0
ip add 1.1.1.2 255.255.255.0
no shut
int s0/1
ip add 2.2.2.1 255.255.255.0
no shut
int tunnel 1
tunnel source 2.2.2.1
tunnel destination 2.2.2.2
ip add 172.16.1.1 255.255.255.0
no shut
router ospf 110
router-id 2.2.2.2
network 2.2.2.0 0.0.0.255 area 1
network 1.1.1.0 0.0.0.255 area 0
network 172.16.1.0 0.0.0.255 area 0
r3
int s0/0
ip add 2.2.2.2 255.255.255.0
no shut
int s0/1
ip add 3.3.3.1 255.255.255.0
no shut
int tunnel 1
tunnel source 2.2.2.2
tunnel destination 2.2.2.1
ip add 172.16.1.2 255.255.255.0
no shut
router ospf 110
router-id 3.3.3.3
network 2.2.2.0 0.0.0.255 area 1
network 3.3.3.0 0.0.0.255 area 2
network 172.16.1.0 0.0.0.255 area 0
r4
int s0/0
ip add 3.3.3.2 255.255.255.0
no shut
router ospf 110
router-id 4.4.4.4
network 3.3.3.0 0.0.0.255 area 2
方法3：創建虛鏈路
R1路由器
int s0/0
ip add 1.1.1.1 255.255.255.0
no shut
router ospf 110
router-id 1.1.1.1
network 1.1.1.0 0.0.0.255 area 0
R2路由器
int s0/0
ip add 1.1.1.2 255.255.255.0
no shut
int s0/1
ip add 2.2.2.1 255.255.255.0
no shut
router ospf 110
router-id 2.2.2.2
network 2.2.2.0 0.0.0.255 area 1
network 1.1.1.0 0.0.0.255 area 0
area 1 virtual-link 3.3.3.3
R3路由器
int s0/0
ip add 2.2.2.2 255.255.255.0
no shut
int s0/1
ip add 3.3.3.1 255.255.255.0
no shut
router ospf 110
router-id 3.3.3.3
network 2.2.2.0 0.0.0.255 area 1
network 3.3.3.0 0.0.0.255 area 2
area 1 virtual-link 2.2.2.2
R4路由器
int s0/0
ip add 3.3.3.2 255.255.255.0
no shut
router ospf 110
router-id 4.4.4.4
network 3.3.3.0 0.0.0.255 area 2
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