实验拓扑

实验需求

1. 按照图示配置 IP 地址和loopback 接口
2. 按照图示分区域配置 OSPF ，实现全网互通
3. 为了路由结构稳定，要求路由器使用环回口作为 Router-id
4. 在AR3上配置静默接口
5. 在OSPF里发布默认路由
6. PC1 PING通公网地址

实验步骤

按照图示配置 IP 地址和loopback 接口

AR1

[Huawei-GigabitEthernet0/0/0]ip address 20.20.20.1 24
[Huawei-GigabitEthernet0/0/1]ip address 10.10.10.1 24

AR2

[Huawei-GigabitEthernet0/0/0]ip address 20.20.20.2 24
[Huawei-GigabitEthernet0/0/1]ip address 30.30.30.1 24
[Huawei-LoopBack0]ip address 4.4.4.4 32

AR3

[Huawei-GigabitEthernet0/0/0]ip address 10.10.10.2 24
[Huawei-GigabitEthernet0/0/1]ip address 10.20.1.1 24
[Huawei-LoopBack0]ip address 1.1.1.1 32

AR4

[AR4-GigabitEthernet0/0/0]ip address 30.30.30.2 24
[AR4-GigabitEthernet0/0/1]ip address 23.1.2.1 24    
[AR4-LoopBack0]ip address 5.5.5.5 32

AR5

[Huawei-GigabitEthernet0/0/0]ip address 23.1.2.2 24

按照图示分区域配置 OSPF ，实现全网互通

AR1

[Huawei]ospf 1 router-id 2.2.2.2
[Huawei-ospf-1]area 0
[Huawei-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[Huawei-ospf-1-area-0.0.0.0]network 20.20.20.0 0.0.0.255


[Huawei-ospf-1]area 1
[Huawei-ospf-1-area-0.0.0.1]network 10.10.10.0 0.0.0.255

AR2

[Huawei]ospf 1 router-id 2.2.2.2
[Huawei-ospf-1]area 0
[Huawei-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[Huawei-ospf-1-area-0.0.0.0]network 20.20.20.0 0.0.0.255

[Huawei-ospf-1-area-0.0.0.0]area 2
[Huawei-ospf-1-area-0.0.0.2]network 30.30.30.0 0.0.0.255

AR3

[Huawei]ospf 1 router-id 1.1.1.1
[Huawei-ospf-1]area 1
[Huawei-ospf-1-area-0.0.0.1]network 1.1.1.1 0.0.0.0
[Huawei-ospf-1-area-0.0.0.1]network 10.10.10.0 0.0.0.255
[Huawei-ospf-1-area-0.0.0.1]network 10.20.1.0 0.0.0.255 

AR4

[AR4]ospf 1 router-id 5.5.5.5
[AR4-ospf-1]area 2
[AR4-ospf-1-area-0.0.0.2]network 5.5.5.5 0.0.0.0
[AR4-ospf-1-area-0.0.0.2]network 30.30.30.0 0.0.0.255

在AR1上查看OSPF 路由表项,发现已经互相学习到了。

[Huawei]dis ip routing-table protocol ospf 
OSPF routing table status : <Active>
         Destinations : 4        Routes : 4

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        1.1.1.1/32  OSPF    10   1           D   10.10.10.2      GigabitEthernet0/0/1
        4.4.4.4/32  OSPF    10   1           D   20.20.20.2      GigabitEthernet0/0/0
        5.5.5.5/32  OSPF    10   2           D   20.20.20.2      GigabitEthernet0/0/0
     30.30.30.0/24  OSPF    10   2           D   20.20.20.2      GigabitEthernet0/0/0

在AR1上查看邻居表, Full State状态表示所有交互已经完成

[Huawei]dis ospf peer brief 

     OSPF Process 1 with Router ID 2.2.2.2
          Peer Statistic Information
 -------------------------------------------------------------------
 Area Id          Interface                        Neighbor id      State    
 0.0.0.0          GigabitEthernet0/0/0             4.4.4.4          Full        
 0.0.0.1          GigabitEthernet0/0/1             1.1.1.1          Full    

在AR3设备 上配置静默接口

[Huawei-ospf-1]silent-interface g0/0/1 ////静默接口 只接受 不发送报文

在AR4上配置一条去往公网的默认路由

[AR4-ospf-1]ip route-static 0.0.0.0  0 23.1.2.2

配置ospf 路由协议中发布默认路由

在AR4 OSPF系统视图里配置

[AR4-ospf-1]default-route-advertise 

在AR2上查看OSPF路由表可以看到去往公网的默认路由，其他运行ospf的路由器已经都学习到区域内产生的一条OSPF路由

[Huawei]dis ip routing-table protocol  ospf 
Route Flags: R - relay, D - download to fib
--------------------------------------------------------------------
Public routing table : OSPF
         Destinations : 6        Routes : 6        

OSPF routing table status : <Active>
         Destinations : 6        Routes : 6

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        0.0.0.0/0   O_ASE   150  1           D   30.30.30.2      GigabitEthernet0/0/1
        1.1.1.1/32  OSPF    10   2           D   20.20.20.1      GigabitEthernet0/0/0
        2.2.2.2/32  OSPF    10   1           D   20.20.20.1      GigabitEthernet0/0/0
        5.5.5.5/32  OSPF    10   1           D   30.30.30.2      GigabitEthernet0/0/1
     10.10.10.0/24  OSPF    10   2           D   20.20.20.1      GigabitEthernet0/0/0
      10.20.1.0/24  OSPF    10   3           D   20.20.20.1      GigabitEthernet0/0/0

在AR5 上配置一条回程路由

[Huawei]ip route-static 0.0.0.0 0 23.1.2.1

PC1 ping 公网地址

PC>ping 23.1.2.2

Ping 23.1.2.2: 32 data bytes, Press Ctrl_C to break
From 23.1.2.2: bytes=32 seq=1 ttl=251 time=47 ms
From 23.1.2.2: bytes=32 seq=2 ttl=251 time=31 ms
From 23.1.2.2: bytes=32 seq=3 ttl=251 time=47 ms
From 23.1.2.2: bytes=32 seq=4 ttl=251 time=47 ms
From 23.1.2.2: bytes=32 seq=5 ttl=251 time=47 ms

--- 23.1.2.2 ping statistics ---
  5 packet(s) transmitted
  5 packet(s) received
  0.00% packet loss
  round-trip min/avg/max = 31/43/47 ms