ospf_lab1 不同区域间的路由

ospf 不同区域间通信

拓扑图如下：





配置如下：

R1：interface Loopback0

ip address 1.1.1.1 255.255.255.0

!

interface Serial1/0

ip address 12.1.1.1 255.255.255.0

serial restart-delay 0

!

router ospf 1

log-adjacency-changes

network 1.1.1.0 0.0.0.255 area 0

network 12.1.1.0 0.0.0.255 area 0

R2：

interface Serial1/0

ip address 12.1.1.2 255.255.255.0

serial restart-delay 0

!

interface Serial1/1

ip address 23.1.1.1 255.255.255.0

serial restart-delay 0

!

router ospf 1

log-adjacency-changes

area 1 virtual-link 2.2.2.2

network 12.1.1.0 0.0.0.255 area 0

network 23.1.1.0 0.0.0.255 area 1

R3：interface Loopback0

ip address 2.2.2.2 255.255.255.0

ip ospf network point-to-point

!

interface Serial1/0

ip address 23.1.1.2 255.255.255.0

serial restart-delay 0

!

interface Serial1/1

ip address 34.1.1.1 255.255.255.0

serial restart-delay 0

!

router ospf 1

log-adjacency-changes

area 1 virtual-link 23.1.1.1

network 2.2.2.0 0.0.0.255 area 1

network 23.1.1.0 0.0.0.255 area 1

network 34.1.1.0 0.0.0.255 area 2

!

R4:interface Loopback0

ip address 4.4.4.4 255.255.255.0

ip ospf network point-to-point

!

interface Serial1/0

ip address 34.1.1.2 255.255.255.0

serial restart-delay 0

!

router ospf 1

log-adjacency-changes

network 4.4.4.0 0.0.0.255 area 2

network 34.1.1.0 0.0.0.255 area 2

!

不同区域间通信:

骨干区域与非骨干区域（图中的区域0和区域1）之间的通信，这个的不同区域间通信就不需要配置虚链路。

如果区域不直接连接到骨干区域就要配置虚链路。 虚链路的配置：area 本地区域ID virtual-link 对方路由器的router ID

虚链路只配置在区域边界路由器上面。相连的两个路由器都需要配置虚链路

环回口默认的网络类型。 R1#show interfaces loo0

Loopback0 is up, line protocol is up

Hardware is Loopback

Internet address is 1.1.1.1/24

MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation LOOPBACK, loopback not set

Last input never, output never, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/0 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out