說明：主要練習OSPF，Area X沒有與Area 0連在一起時該如何處理，
可用兩種方式：一、Vitrual Link，二、Tunnel
此Lab是用實機完成，PacketTracer可設定但當掉的機會還滿高的。
為了減少行數，刪掉不必要之設定。
Vitrual Link作法：
一、在Core_Ro與wg_ro_1中建立一條依附在Area1上的Vitrual Link，讓Area2能與Area0相連。
二、在wg_ro_1與wg_ro_2中建立一條依附在Area2上的Vitrual Link，讓Area12能與Area0相連。
Tunnel作法：
可分為兩種作法
一、和Virtual Link一樣，在各Router相連都建一條Tunnel。Tunnel10+Tunnel100(範例是用這個方法)
二、Core_Ro對每台Rotuer都建立一條Tunnel。Tunnel10+Tunnelxx
三、這兩種都需將Tunnel網段丟進OSPF Area 0
實作條件：
一、Core_Ro左邊為Area0，右邊(10.140.1.0)與wg_ro_1相連為Area1
二、wg_ro_1右邊(10.12.12.0)和wg_ro_2左邊(10.12.12.0)相連為Area2
三、wg_ro_2右邊(192.168.102.0)為Area12
四、利用Vitrual Link或Tunnel讓整個每台Router皆有完整OPSF
wg_ro_1設定如下：
Wg_RO_1#sh run
Building configuration...
Current configuration : 1289 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Wg_RO_1
!
no aaa new-model
no network-clock-participate slot 1
no network-clock-participate wic 0
ip cef
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
interface Tunnel10 建立Core_Ro到wg_ro_1的Tunnel
ip address 100.10.10.2 255.255.255.0
tunnel source 10.140.1.2 wg_ro_1 ip
tunnel destination 10.140.1.1 Core_Ro ip
!
interface Tunnel100 建立wg_ro_1到wg_ro_2的Tunnel
ip address 10.21.21.1 255.255.255.0
tunnel source 10.12.12.1 wg_ro_1 ip
tunnel destination 10.12.12.2 wg_ro_2 ip
!
interface Serial0/0
ip address 10.140.1.2 255.255.255.0
!
interface Serial0/1
ip address 10.12.12.1 255.255.255.0
clock rate 128000
!
router ospf 123
router-id 1.1.1.1
log-adjacency-changes
network 10.12.12.1 0.0.0.0 area 2
network 10.21.21.1 0.0.0.0 area 0 Tunnel網段丟進Area0
network 10.140.1.2 0.0.0.0 area 1
network 100.10.10.2 0.0.0.0 area 0 Tunnel網段丟進Area0
area 1 virtual-link 100.100.100.100 依附在Area1的VL，對方的Router-ID
area 2 virtual-link 2.2.2.2 依附在Area2的VL，對方的Router-ID
!
end
wg_ro_2設定如下：
Wg_RO_2#sh run
Building configuration...
Current configuration : 1129 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Wg_Ro_2
!
no aaa new-model
no network-clock-participate slot 1
no network-clock-participate wic 0
ip cef
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
interface Tunnel100 建立wg_ro_1到wg_ro_2的Tunnel
ip address 10.21.21.2 255.255.255.0
tunnel source 10.12.12.2 wg_ro_2 ip
tunnel destination 10.12.12.1 wg_ro_1 ip
!
interface FastEthernet0/1
ip address 192.168.102.254 255.255.255.0
duplex auto
speed auto
!
interface Serial0/1
ip address 10.12.12.2 255.255.255.0
!
router ospf 123
router-id 2.2.2.2
log-adjacency-changes
network 10.12.12.2 0.0.0.0 area 2
network 10.21.21.2 0.0.0.0 area 0 Tunnel網段丟進Area0
network 192.168.102.254 0.0.0.0 area 12
area 2 virtual-link 1.1.1.1 依附在Area2的VL，對方的Router-ID
!
end
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