一，实验要求

 所有到达目标的路径最优,互有备份

二，搭建拓扑图

在这里插入图片描述

三，配置IP地址和环回地址

Interface                         IP Address/Mask      Physical   Protocol  
GigabitEthernet0/0/0              12.1.1.1/24          up         up        
GigabitEthernet0/0/1              13.1.1.1/24          up         up        
GigabitEthernet0/0/2              unassigned           down       down      
LoopBack0                         1.1.1.1/32           up         up(s)     
NULL0                             unassigned           up

四，宣告OSPF

Public routing table : OSPF
         Destinations : 8        Routes : 8        

OSPF routing table status : <Active>
         Destinations : 8        Routes : 8

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface

        1.1.1.1/32  OSPF    10   3           D   45.1.1.1        GigabitEthernet
0/0/0
        2.2.2.2/32  OSPF    10   2           D   45.1.1.1        GigabitEthernet
0/0/0
        3.3.3.3/32  OSPF    10   2           D   45.1.1.1        GigabitEthernet
0/0/0
        4.4.4.4/32  OSPF    10   1           D   45.1.1.1        GigabitEthernet
0/0/0
       12.1.1.0/24  OSPF    10   3           D   45.1.1.1        GigabitEthernet
0/0/0
       13.1.1.0/24  OSPF    10   3           D   45.1.1.1        GigabitEthernet
0/0/0
       24.1.1.0/24  OSPF    10   2           D   45.1.1.1        GigabitEthernet
0/0/0
       34.1.1.0/24  OSPF    10   2           D   45.1.1.1        GigabitEthernet
0/0/0

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

五，抓取流量

[r3]ip ip-prefix yy per	
[r3]ip ip-prefix yy permit 24.1.1.0 24
[r3]rou	
[r3]route-	
[r3]route-policy aa per	
[r3]route-policy aa permit nod	
[r3]route-policy aa permit node 20
Info: New Sequence of this List.
[r3-route-policy]if	
[r3-route-policy]if-match ip	
[r3-route-policy]if-match ip-	
[r3-route-policy]if-match ip-prefix yy
[r3-route-policy]apply c	
[r3-route-policy]apply cos	
[r3-route-policy]apply cost 1

六，测试

[r1]tracert 5.5.5.5

 traceroute to  5.5.5.5(5.5.5.5), max hops: 30 ,packet length: 40,press CTRL_C t
o break 

 1 13.1.1.2 20 ms  20 ms  10 ms 

 2 34.1.1.2 20 ms 24.1.1.2 20 ms  40 ms 

 3 45.1.1.2 20 ms  20 ms  30 ms

[r1]ping 5.5.5.5
  PING 5.5.5.5: 56  data bytes, press CTRL_C to break
    Reply from 5.5.5.5: bytes=56 Sequence=1 ttl=253 time=30 ms
    Reply from 5.5.5.5: bytes=56 Sequence=2 ttl=253 time=30 ms
    Reply from 5.5.5.5: bytes=56 Sequence=3 ttl=253 time=20 ms
    Reply from 5.5.5.5: bytes=56 Sequence=4 ttl=253 time=30 ms
    Reply from 5.5.5.5: bytes=56 Sequence=5 ttl=253 time=40 ms

  --- 5.5.5.5 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 20/30/40 ms