配置单区域的OSPF，使两台client可以互访：
[RTA]int e0/1
[RTA-Ethernet0/1]ip add 10.0.0.1 24
[RTA-Ethernet0/1]undo shutdown
[RTA-Ethernet0/1]int e0/0
[RTA-Ethernet0/0]ip add 20.0.0.1 24
[RTA-Ethernet0/0]undo shutdown
[RTA-Ethernet0/0]int loop1
[RTA-LoopBack1]ip add 1.1.1.1 32
[RTB]int e0/0
[RTB-Ethernet0/0]ip add 20.0.0.2 24
[RTB-Ethernet0/0]undo shutdown
[RTB-Ethernet0/0]int e0/1
[RTB-Ethernet0/1]ip add 10.1.0.1 24
[RTB-Ethernet0/1]undo shutdown
[RTB]int loop1
[RTB-LoopBack1]ip add 2.2.2.2 32
PCA:10.0.0.2 255.255.255.0 GT:10.0.0.1
PCB:10.1.0.2 255.255.255.0 GT:10.1.0.1
[RTA]router id 1.1.1.1 指定RID
[RTA]ospf 1 启用OSPF
[RTA-ospf-1]area 0 指定区域
[RTA-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0 使接口能OSPF
[RTA-ospf-1-area-0.0.0.0]network 10.0.0.0 0.0.0.255
[RTA-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255
[RTB]router id 2.2.2.2
[RTB]ospf 1
[RTB-ospf-1]area 0
[RTB-ospf-1-area-0.0.0.0]network 20.0.0.0 0.0.0.255
[RTB-ospf-1-area-0.0.0.0]network 10.1.0.0 0.0.0.255
[RTB-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
此时RTA,RTB已经成功学习到对端的路由信息。PCA和PCB可相互通讯：
[RTA]disp ip routing-table
Routing Tables: Public
Destinations : 9 Routes : 9
Destination/Mask Proto Pre Cost NextHop Interface
1.1.1.1/32 Direct 0 0 127.0.0.1 InLoop0
2.2.2.2/32 OSPF 10 10 20.0.0.2 Eth0/0
10.0.0.0/24 Direct 0 0 10.0.0.1 Eth0/1
10.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0
10.1.0.0/24 OSPF 10 20 20.0.0.2 Eth0/0
20.0.0.0/24 Direct 0 0 20.0.0.1 Eth0/0
20.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0
127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0
127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0
[RTB]disp ip routing-table
Routing Tables: Public
Destinations : 9 Routes : 9
Destination/Mask Proto Pre Cost NextHop Interface
1.1.1.1/32 OSPF 10 10 20.0.0.1 Eth0/0
2.2.2.2/32 Direct 0 0 127.0.0.1 InLoop0
10.0.0.0/24 OSPF 10 20 20.0.0.1 Eth0/0
10.1.0.0/24 Direct 0 0 10.1.0.1 Eth0/1
10.1.0.1/32 Direct 0 0 127.0.0.1 InLoop0
20.0.0.0/24 Direct 0 0 20.0.0.2 Eth0/0
20.0.0.2/32 Direct 0 0 127.0.0.1 InLoop0
127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0
127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0
PCA:C:\Documents and Settings\xiaofei>ping 10.1.0.2
Pinging 10.1.0.2 with 32 bytes of data:
Reply from 10.1.0.2: bytes=32 time=5ms TTL=253
Reply from 10.1.0.2: bytes=32 time=2ms TTL=253
Reply from 10.1.0.2: bytes=32 time=1ms TTL=253
Reply from 10.1.0.2: bytes=32 time=1ms TTL=253
Ping statistics for 10.1.0.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 5ms, Average = 2ms
PCB:C:\Documents and Settings\xiaofei>ping 10.0.0.2
Pinging 10.1.0.2 with 32 bytes of data:
Reply from 10.0.0.2: bytes=32 time=5ms TTL=253
Reply from 10.0.0.2: bytes=32 time=2ms TTL=253
Reply from 10.0.0.2: bytes=32 time=1ms TTL=253
Reply from 10.0.0.2: bytes=32 time=1ms TTL=253
Ping statistics for 10.0.0.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 1ms, Maximum = 5ms, Average = 2ms
