OSPF協議專案實戰

阿新 • • 發佈：2020-08-04

1、要求按照下列標準配置一個OSPF網路
2、配置一個IP網路，實驗邏輯圖如圖，IP地址見拓撲圖
3、路由協議採用OSPF，程序ID為1 ，RID為loopback0地址
4、R1/R2/R3相連的三個站點鏈路OSPF網路型別配置成廣播型，其中R1路由器做為永久性DR
5、按照圖示配置OSPF區域，其中R2/R3/R4之間的區域要配置成完全末梢區域
6、R6為新併入的站點，由於來不及佈線施工而暫時併到R5這個站點上，所在區域為AREA 56，配置使得所有網路可達(採用ping測試)
7、OSPF內部的網路希望通過R1路由器訪問Internet，配置R1使其能夠滿足需求，只考慮內部路由器上路由的實現，不考慮NAT（下發預設路由）

8、AREA 0基於安全的原因配置上MD5認證，Key-ID為1，密碼：Huawei
9、於R3與R4之間的鏈路質量較好，適當配置使得R4優先選取R3訪問自身區域除外的外部網路
10、為了減少網路流量，R1只能學習到R6環回口的路由條目彙總條目（172.16.0.0/16）

1、要求按照下列標準配置一個OSPF網路

搭建拓撲圖如下

2、配置一個IP網路，實驗邏輯圖如圖，IP地址見拓撲圖

R1的IP地址配置

sysname R1
#
interface GigabitEthernet0/0/0
 ip address 192.168.123.1 255.255.255.0 
#
interface LoopBack0
 ip address  
1.1.1.1 255.255.255.255

R2的IP地址配置

sysname R2
#
interface GigabitEthernet0/0/0
 ip address 192.168.123.2 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 192.168.24.2 255.255.255.0 
#
interface LoopBack0
 ip address 2.2.2.2 255.255.255.255 
#

R3的IP地址配置

sysname R3
#
interface GigabitEthernet0/0/0
 ip address  
192.168.123.3 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 192.168.34.3 255.255.255.0 
#
interface GigabitEthernet0/0/2
 ip address 192.168.35.3 255.255.255.0 
#
interface LoopBack0
 ip address 3.3.3.3 255.255.255.255

R4的IP地址配置

 sysname R4
#
interface GigabitEthernet0/0/0
 ip address 192.168.24.4 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 192.168.34.4 255.255.255.0 
#
interface LoopBack0
 ip address 4.4.4.4 255.255.255.255 
#

R5的IP地址配置

sysname R5
#
interface GigabitEthernet0/0/0
 ip address 192.168.35.5 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 192.168.56.5 255.255.255.0 
#
interface LoopBack0
 ip address 5.5.5.5 255.255.255.255 
#

R6的IP地址配置

sysname R6
#
interface GigabitEthernet0/0/0
 ip address 192.168.56.6 255.255.255.0 
#
interface LoopBack0
 ip address 192.168.3.1 255.255.255.0 
#
interface LoopBack1
 ip address 172.16.1.1 255.255.255.0 
#
interface LoopBack2
 ip address 172.16.2.1 255.255.255.0 
#
interface LoopBack3
 ip address 172.16.3.1 255.255.255.0 
#
interface LoopBack4
 ip address 172.16.4.1 255.255.255.0

做完基本的IP地址配置後，大家可以自行ping通各自的直連網段

3、路由協議採用OSPF，程序ID為1 ，RID為loopback0地址

R1的OSPF配置

ospf 1 router-id 1.1.1.1 
 area 0.0.0.0 
  network 1.1.1.1 0.0.0.0 
  network 192.168.123.0 0.0.0.255

R2的OSPF配置

ospf 1 router-id 2.2.2.2
 area 0.0.0.0 
  network 2.2.2.2 0.0.0.0 
  network 192.168.123.0 0.0.0.255 
area 0.0.0.234 
  network 192.168.24.0 0.0.0.255

R3的OSPF配置

ospf 1 router-id 3.3.3.3
 area 0.0.0.0 
  network 3.3.3.3 0.0.0.0 
  network 192.168.123.0 0.0.0.255 
area 0.0.0.234 
  network 192.168.34.0 0.0.0.255 
area 0.0.0.35 
  network 192.168.35.0 0.0.0.255

R4的OSPF配置

ospf 1 router-id 4.4.4.4 
 area 0.0.0.234 
  network 4.4.4.4 0.0.0.0 
  network 192.168.24.0 0.0.0.255 
  network 192.168.34.0 0.0.0.255

R5的OSPF配置

ospf 1 router-id 5.5.5.5 
area 0.0.0.35 
  network 5.5.5.5 0.0.0.0 
  network 192.168.35.0 0.0.0.255 
area 0.0.0.56 
  network 192.168.56.0 0.0.0.255

R6的OSPF配置

ospf 1 router-id 6.6.6.6 
 area 0.0.0.56 
  network 6.6.6.6 0.0.0.0 
  network 172.16.1.0 0.0.0.255 
  network 172.16.2.0 0.0.0.255 
  network 172.16.3.0 0.0.0.255 
  network 172.16.4.0 0.0.0.255 
  network 192.168.56.0 0.0.0.255

檢查

在各路由器上面檢查如下

<R1>display ospf peer brief 

     OSPF Process 1 with Router ID 1.1.1.1
          Peer Statistic Information
 ----------------------------------------------------------------------------
 Area Id          Interface                        Neighbor id      State    
 0.0.0.0          GigabitEthernet0/0/0             2.2.2.2          Full        
 0.0.0.0          GigabitEthernet0/0/0             3.3.3.3          Full        
 ----------------------------------------------------------------------------
<R1>

<R2>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             1.1.1.1          Full        
 0.0.0.0          GigabitEthernet0/0/0             3.3.3.3          Full        
 0.0.0.234        GigabitEthernet0/0/1             4.4.4.4          Full        
 ----------------------------------------------------------------------------
<R2>

[R3]display ospf peer brief 

     OSPF Process 1 with Router ID 3.3.3.3
          Peer Statistic Information
 ----------------------------------------------------------------------------
 Area Id          Interface                        Neighbor id      State    
 0.0.0.0          GigabitEthernet0/0/0             1.1.1.1          Full        
 0.0.0.0          GigabitEthernet0/0/0             2.2.2.2          Full        
 0.0.0.35         GigabitEthernet0/0/2             5.5.5.5          Full        
 0.0.0.234        GigabitEthernet0/0/1             4.4.4.4          Full        
 ----------------------------------------------------------------------------
[R3]

[R4]display ospf peer brief

     OSPF Process 1 with Router ID 4.4.4.4
          Peer Statistic Information
 ----------------------------------------------------------------------------
 Area Id          Interface                        Neighbor id      State    
 0.0.0.234        GigabitEthernet0/0/0             2.2.2.2          Full        
 0.0.0.234        GigabitEthernet0/0/1             3.3.3.3          Full        
 ----------------------------------------------------------------------------
[R4]

[R5]display ospf peer brief

     OSPF Process 1 with Router ID 5.5.5.5
          Peer Statistic Information
 ----------------------------------------------------------------------------
 Area Id          Interface                        Neighbor id      State    
 0.0.0.35         GigabitEthernet0/0/0             3.3.3.3          Full        
 0.0.0.56         GigabitEthernet0/0/1             6.6.6.6          Full        
 ----------------------------------------------------------------------------
[R5]

[R6]display ospf peer brief

     OSPF Process 1 with Router ID 6.6.6.6
          Peer Statistic Information
 ----------------------------------------------------------------------------
 Area Id          Interface                        Neighbor id      State    
 0.0.0.56         GigabitEthernet0/0/0             5.5.5.5          Full        
 ----------------------------------------------------------------------------
[R6]

此時發現R1 R2 R3 R4 R5之間都能夠學習到各自的OSPF路由條目，R6由於沒有按照正確的OSPF拓撲區域結構進行劃分，導致R6不能夠學習到任何其他裝置的路由條目

4、R1/R2/R3相連的三個站點鏈路OSPF網路型別配置成廣播型，其中R1路由器做為永久性DR

思路就是把R2和R3的介面優先順序設定為0 OSPF的介面優先順序的取值範圍是0~255 當優先順序為0的時候代表本介面OSPF路由器不參與DR的選舉，優先順序為255就只代表優先順序為255 這個和VRRP那個優先順序要區分開來

interface GigabitEthernet0/0/0
 ospf dr-priority 0

在R1上面檢視DR

<R1>display ospf interface GigabitEthernet 0/0/0

     OSPF Process 1 with Router ID 1.1.1.1
         Interfaces 


 Interface: 192.168.123.1 (GigabitEthernet0/0/0)
 Cost: 1       State: DR        Type: Broadcast    MTU: 1500  
 Priority: 1
 Designated Router: 192.168.123.1
 Backup Designated Router: 0.0.0.0
 Timers: Hello 10 , Dead 40 , Poll  120 , Retransmit 5 , Transmit Delay 1 
<R1>

5、按照圖示配置OSPF區域，其中R2/R3/R4之間的區域要配置成完全末梢區域

R2的配置

ospf 1 router-id 2.2.2.2 
area 0.0.0.234 
  stub no-summary

R3的配置

ospf 1 router-id 3.3.3.3
area 0.0.0.234 
  stub no-summary

R4的配置

ospf 1 router-id 4.4.4.4
area 0.0.0.234 
  stub no-summary

檢查：

[R4]display ospf lsdb 

     OSPF Process 1 with Router ID 4.4.4.4
         Link State Database 

                 Area: 0.0.0.234
 Type      LinkState ID    AdvRouter          Age  Len   Sequence   Metric
 Router    4.4.4.4         4.4.4.4             51  60    80000006       1
 Router    2.2.2.2         2.2.2.2             53  36    80000005       1
 Router    3.3.3.3         3.3.3.3             58  36    80000005       1
 Network   192.168.24.4    4.4.4.4             51  32    80000002       0
 Network   192.168.34.4    4.4.4.4             55  32    80000002       0
 Sum-Net   0.0.0.0         3.3.3.3            111  28    80000001       1
 Sum-Net   0.0.0.0         2.2.2.2            122  28    80000001       1
 
[R4]display ip routing-table 
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 12       Routes : 13       

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        0.0.0.0/0   OSPF    10   2           D   192.168.34.3    GigabitEthernet
0/0/1
                    OSPF    10   2           D   192.168.24.2    GigabitEthernet
0/0/0
        4.4.4.4/32  Direct  0    0           D   127.0.0.1       LoopBack0
      127.0.0.0/8   Direct  0    0           D   127.0.0.1       InLoopBack0
      127.0.0.1/32  Direct  0    0           D   127.0.0.1       InLoopBack0
127.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0
   192.168.24.0/24  Direct  0    0           D   192.168.24.4    GigabitEthernet
0/0/0
   192.168.24.4/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
0/0/0
 192.168.24.255/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
0/0/0
   192.168.34.0/24  Direct  0    0           D   192.168.34.4    GigabitEthernet
0/0/1
   192.168.34.4/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
0/0/1
 192.168.34.255/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
0/0/1
255.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0

[R4]

6、R6為新併入的站點，由於來不及佈線施工而暫時併到R5這個站點上，所在區域為AREA 56，配置使得所有網路可達(採用ping測試)

R3的配置如下

ospf 1 router-id 3.3.3.3 
area 0.0.0.35 
  network 192.168.35.0 0.0.0.255 
  vlink-peer 5.5.5.5

R5的配置如下

ospf 1 router-id 5.5.5.5
area 0.0.0.35 
  network 192.168.35.0 0.0.0.255 
  vlink-peer 3.3.3.3

檢查

[R3]display ospf vlink 

     OSPF Process 1 with Router ID 3.3.3.3
         Virtual Links 

 Virtual-link Neighbor-id  -> 5.5.5.5, Neighbor-State: Full

 Interface: 192.168.35.3 (GigabitEthernet0/0/2)
 Cost: 1  State: P-2-P  Type: Virtual 
 Transit Area: 0.0.0.35 
 Timers: Hello 10 , Dead 40 , Retransmit 5 , Transmit Delay 1 
 GR State: Normal 
 
[R3]

[R5]display ospf vlink 

     OSPF Process 1 with Router ID 5.5.5.5
         Virtual Links 

 Virtual-link Neighbor-id  -> 3.3.3.3, Neighbor-State: Full

 Interface: 192.168.35.5 (GigabitEthernet0/0/0)
 Cost: 1  State: P-2-P  Type: Virtual 
 Transit Area: 0.0.0.35 
 Timers: Hello 10 , Dead 40 , Retransmit 5 , Transmit Delay 1 
 GR State: Normal 
 
[R5]

檢查一下路由情況

在R1這邊檢視172網段的路由情況

<R1>display ospf lsdb 

     OSPF Process 1 with Router ID 1.1.1.1
         Link State Database 

                 Area: 0.0.0.0
 Type      LinkState ID    AdvRouter          Age  Len   Sequence   Metric
 Router    2.2.2.2         2.2.2.2            468  48    8000000E       1
 Router    1.1.1.1         1.1.1.1            472  48    8000000E       1
 Router    5.5.5.5         5.5.5.5            104  36    80000001       1
 Router    3.3.3.3         3.3.3.3            103  60    80000010       1
 Network   192.168.123.1   1.1.1.1            474  36    80000009       0
 Sum-Net   192.168.56.0    5.5.5.5            115  28    80000001       1
 Sum-Net   5.5.5.5         3.3.3.3            850  28    80000001       1
 Sum-Net   5.5.5.5         5.5.5.5            115  28    80000001       0
 Sum-Net   192.168.35.0    3.3.3.3            921  28    80000001       1
 Sum-Net   192.168.35.0    5.5.5.5            115  28    80000001       1
 Sum-Net   172.16.3.1      5.5.5.5            115  28    80000001       1
 Sum-Net   192.168.34.0    3.3.3.3            352  28    80000002       1
 Sum-Net   192.168.34.0    2.2.2.2            292  28    80000001       2
 Sum-Net   172.16.2.1      5.5.5.5            115  28    80000001       1
 Sum-Net   192.168.24.0    2.2.2.2            363  28    80000002       1
 Sum-Net   192.168.24.0    3.3.3.3            287  28    80000002       2
 Sum-Net   172.16.1.1      5.5.5.5            115  28    80000001       1
 Sum-Net   4.4.4.4         3.3.3.3            299  28    80000001       1
 Sum-Net   4.4.4.4         2.2.2.2            292  28    80000001       1
 Sum-Net   172.16.4.1      5.5.5.5            115  28    80000001       1

[R3]display ospf lsdb 

     OSPF Process 1 with Router ID 3.3.3.3
         Link State Database 

                 Area: 0.0.0.0
 Type      LinkState ID    AdvRouter          Age  Len   Sequence   Metric
 Router    2.2.2.2         2.2.2.2            538  48    8000000E       1
 Router    1.1.1.1         1.1.1.1            543  48    8000000E       1
 Router    5.5.5.5         5.5.5.5            173  36    80000001       1
 Router    3.3.3.3         3.3.3.3            172  60    80000010       1
 Network   192.168.123.1   1.1.1.1            545  36    80000009       0
 Sum-Net   192.168.56.0    5.5.5.5            184  28    80000001       1
 Sum-Net   5.5.5.5         3.3.3.3            919  28    80000001       1
 Sum-Net   5.5.5.5         5.5.5.5            184  28    80000001       0
 Sum-Net   192.168.35.0    3.3.3.3            990  28    80000001       1
 Sum-Net   192.168.35.0    5.5.5.5            184  28    80000001       1
 Sum-Net   172.16.3.1      5.5.5.5            184  28    80000001       1
 Sum-Net   192.168.34.0    3.3.3.3            421  28    80000002       1
 Sum-Net   192.168.34.0    2.2.2.2            363  28    80000001       2
 Sum-Net   172.16.2.1      5.5.5.5            184  28    80000001       1
 Sum-Net   192.168.24.0    2.2.2.2            434  28    80000002       1
 Sum-Net   192.168.24.0    3.3.3.3            356  28    80000002       2
 Sum-Net   172.16.1.1      5.5.5.5            184  28    80000001       1
 Sum-Net   4.4.4.4         3.3.3.3            368  28    80000001       1
 Sum-Net   4.4.4.4         2.2.2.2            363  28    80000001       1
 Sum-Net   172.16.4.1      5.5.5.5            184  28    80000001       1
 
                 Area: 0.0.0.35
 Type      LinkState ID    AdvRouter          Age  Len   Sequence   Metric
 Router    5.5.5.5         5.5.5.5            173  48    80000006       1
 Router    3.3.3.3         3.3.3.3            172  36    80000006       1
 Network   192.168.35.3    3.3.3.3            919  32    80000002       0
 Sum-Net   192.168.56.0    5.5.5.5            183  28    80000001       1
 Sum-Net   192.168.123.0   3.3.3.3            990  28    80000001       1
 Sum-Net   3.3.3.3         3.3.3.3            990  28    80000001       0
 Sum-Net   172.16.3.1      5.5.5.5            184  28    80000001       1
 Sum-Net   192.168.34.0    3.3.3.3            424  28    80000002       1
 Sum-Net   172.16.2.1      5.5.5.5            186  28    80000001       1
 Sum-Net   192.168.24.0    3.3.3.3            424  28    80000002       2
 Sum-Net   172.16.1.1      5.5.5.5            186  28    80000001       1
 Sum-Net   4.4.4.4         3.3.3.3            371  28    80000001       1
 Sum-Net   2.2.2.2         3.3.3.3            543  28    80000002       1
 Sum-Net   172.16.4.1      5.5.5.5            186  28    80000001       1
 Sum-Net   1.1.1.1         3.3.3.3            543  28    80000002       1
 
                 Area: 0.0.0.234
 Type      LinkState ID    AdvRouter          Age  Len   Sequence   Metric
 Router    4.4.4.4         4.4.4.4            366  60    80000006       1
 Router    2.2.2.2         2.2.2.2            368  36    80000005       1
 Router    3.3.3.3         3.3.3.3            371  36    80000005       1
 Network   192.168.24.4    4.4.4.4            366  32    80000002       0
 Network   192.168.34.4    4.4.4.4            371  32    80000002       0
 Sum-Net   0.0.0.0         3.3.3.3            424  28    80000001       1
 Sum-Net   0.0.0.0         2.2.2.2            437  28    80000001       1

7、OSPF內部的網路希望通過R1路由器訪問Internet，配置R1使其能夠滿足需求，只考慮內部路由器上路由的實現，不考慮NAT（下發預設路由）

在R1上面配置靜態路由然後下發其靜態路由

ip route-static 0.0.0.0 0.0.0.0 192.168.60.1

ospf 1 router-id 1.1.1.1 
 default-route-advertise
 area 0.0.0.0

在R2 R3 R5 R6上面檢視路由表

<R2>display ip routing-table protocol ospf 
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Public routing table : OSPF
         Destinations : 12       Routes : 12       

OSPF routing table status : <Active>
         Destinations : 12       Routes : 12

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        0.0.0.0/0   O_ASE   150  1           D   192.168.123.1   GigabitEthernet
0/0/0
        1.1.1.1/32  OSPF    10   1           D   192.168.123.1   GigabitEthernet
0/0/0
        3.3.3.3/32  OSPF    10   1           D   192.168.123.3   GigabitEthernet
0/0/0
        4.4.4.4/32  OSPF    10   1           D   192.168.24.4    GigabitEthernet
0/0/1
        5.5.5.5/32  OSPF    10   2           D   192.168.123.3   GigabitEthernet
0/0/0
     172.16.1.1/32  OSPF    10   3           D   192.168.123.3   GigabitEthernet
0/0/0
     172.16.2.1/32  OSPF    10   3           D   192.168.123.3   GigabitEthernet
0/0/0
     172.16.3.1/32  OSPF    10   3           D   192.168.123.3   GigabitEthernet
0/0/0
     172.16.4.1/32  OSPF    10   3           D   192.168.123.3   GigabitEthernet
0/0/0
   192.168.34.0/24  OSPF    10   2           D   192.168.24.4    GigabitEthernet
0/0/1
   192.168.35.0/24  OSPF    10   2           D   192.168.123.3   GigabitEthernet
0/0/0
   192.168.56.0/24  OSPF    10   3           D   192.168.123.3   GigabitEthernet
0/0/0

OSPF routing table status : <Inactive>
         Destinations : 0        Routes : 0

8、AREA 0基於安全的原因配置上MD5認證，Key-ID為1，密碼：Huawei

在R1的區域0中配置區域0的認證

#
ospf 1 router-id 1.1.1.1 
area 0.0.0.0 
  authentication-mode md5 1 plain Huawei
#

在R2的區域0中配置區域0的認證

#
ospf 1 router-id 2.2.2.2
area 0.0.0.0 
  authentication-mode md5 1 plain Huawei
#

在R3的區域0中配置區域0的認證

#
ospf 1 router-id 3.3.3.3
area 0.0.0.0 
  authentication-mode md5 1 plain Huawei
#

在R5的區域0中配置區域0的認證

#
ospf 1 router-id 5.5.5.5
area 0.0.0.0 
  authentication-mode md5 1 plain Huawei

或者第二種方法：

#
ospf 1 router-id 5.5.5.5 
 area 0.0.0.0 
 area 0.0.0.35 
  network 5.5.5.5 0.0.0.0 
  network 192.168.35.0 0.0.0.255 
  vlink-peer 3.3.3.3 md5 1 plain Huawei    直接在後面接上認證的引數也是可以的
 area 0.0.0.56 
  network 192.168.56.0 0.0.0.255 
#

檢查看下 R5和R3之間的FULL關係是否正常

9、於R3與R4之間的鏈路質量較好，適當配置使得R4優先選取R3訪問自身區域除外的外部網路

在R4的G0/0/0介面修改OSPF的開銷值

[R4-GigabitEthernet0/0/0]dis this
[V200R003C00]
#
interface GigabitEthernet0/0/0
 ip address 192.168.24.4 255.255.255.0 
 ospf cost 2
#

檢查

[R4]display ip routing-table 
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
         Destinations : 12       Routes : 12       

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        0.0.0.0/0   OSPF    10   2           D   192.168.34.3    GigabitEthernet
0/0/1
        4.4.4.4/32  Direct  0    0           D   127.0.0.1       LoopBack0
      127.0.0.0/8   Direct  0    0           D   127.0.0.1       InLoopBack0
      127.0.0.1/32  Direct  0    0           D   127.0.0.1       InLoopBack0
127.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0
   192.168.24.0/24  Direct  0    0           D   192.168.24.4    GigabitEthernet
0/0/0
   192.168.24.4/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
0/0/0
 192.168.24.255/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
0/0/0
   192.168.34.0/24  Direct  0    0           D   192.168.34.4    GigabitEthernet
0/0/1
   192.168.34.4/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
0/0/1
 192.168.34.255/32  Direct  0    0           D   127.0.0.1       GigabitEthernet
0/0/1
255.255.255.255/32  Direct  0    0           D   127.0.0.1       InLoopBack0

10、為了減少網路流量，R1只能學習到R6環回口的路由條目彙總條目（172.16.0.0/16）

在R5的區域56當中進行路由彙總

#
ospf 1 router-id 5.5.5.5 
area 0.0.0.56 
  abr-summary 172.16.0.0 255.255.0.0
#
return

檢查如下

[R1]dis ip routing-table protocol ospf 
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Public routing table : OSPF
         Destinations : 9        Routes : 10       

OSPF routing table status : <Active>
         Destinations : 9        Routes : 10

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        2.2.2.2/32  OSPF    10   1           D   192.168.123.2   GigabitEthernet
0/0/0
        3.3.3.3/32  OSPF    10   1           D   192.168.123.3   GigabitEthernet
0/0/0
        4.4.4.4/32  OSPF    10   2           D   192.168.123.3   GigabitEthernet
0/0/0
                    OSPF    10   2           D   192.168.123.2   GigabitEthernet
0/0/0
        5.5.5.5/32  OSPF    10   2           D   192.168.123.3   GigabitEthernet
0/0/0
     172.16.0.0/16  OSPF    10   3           D   192.168.123.3   GigabitEthernet
0/0/0
   192.168.24.0/24  OSPF    10   2           D   192.168.123.2   GigabitEthernet
0/0/0
   192.168.34.0/24  OSPF    10   2           D   192.168.123.3   GigabitEthernet
0/0/0
   192.168.35.0/24  OSPF    10   2           D   192.168.123.3   GigabitEthernet
0/0/0
   192.168.56.0/24  OSPF    10   3           D   192.168.123.3   GigabitEthernet
0/0/0

OSPF routing table status : <Inactive>
         Destinations : 0        Routes : 0