3.3 OSPF特性

1.路由汇总

1)在ABR上部署路由汇总

图片[1]-3.3 OSPF特性-大赛人网
图3-30 OSPF ABR路由汇总网络拓扑
OSPF需要手动进行路由汇总。
(1)路由汇总前
[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0
[R1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[R1-ospf-1-area-0.0.0.0]network 13.1.1.0 0.0.0.255
[R2]ospf 1 router-id 2.2.2.2
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[R2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[R2-ospf-1]area 1
[R2-ospf-1-area-0.0.0.1]network 192.168.1.0 0.0.0.255     
[R2-ospf-1-area-0.0.0.1]network 192.168.31.0 0.0.0.255

[R3]ospf 1 router-id 3.3.3.3
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[R3-ospf-1-area-0.0.0.0]network 13.1.1.0 0.0.0.255
[R3-ospf-1]area 2
[R3-ospf-1-area-0.0.0.2]network 192.168.32.0 0.0.0.255
[R3-ospf-1-area-0.0.0.2]network 192.168.63.0 0.0.0.255
<R1>display ip routing-table protocol ospf
Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface
192.168.1.0/24  OSPF    10   2           D   12.1.1.2        GigabitEthernet0/0/2
192.168.31.0/24  OSPF    10   2           D   12.1.1.2        GigabitEthernet0/0/2
192.168.32.0/24  OSPF    10   2           D   13.1.1.3        GigabitEthernet0/0/0
192.168.63.0/24  OSPF    10   2           D   13.1.1.3        GigabitEthernet0/0/0

(2)路由汇总后

[R2-ospf-1]area 1
[R2-ospf-1-area-0.0.0.1]abr-summary 192.168.0.0 255.255.224.0
[R3-ospf-1]area 2
[R3-ospf-1-area-0.0.0.2]abr-summary 192.168.32.0 255.255.224.0
<R1>display ip routing-table protocol ospf
Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface     
192.168.0.0/19  OSPF    10   2           D   12.1.1.2        GigabitEthernet0/0/2
192.168.32.0/19  OSPF    10   2           D   13.1.1.3        GigabitEthernet0/0/0

2)在ASBR上部署路由汇总

图片[2]-3.3 OSPF特性-大赛人网
图3-31 OSPF ASBR路由汇总网络拓扑

(1)路由汇总前

[R1]rip 1
[R1-rip-1]version 2 
[R1-rip-1]network 14.0.0.0
[R1-rip-1]import-route ospf
[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]import-route rip 

[R4]rip 1
[R4-rip-1]version 2
[R4-rip-1]network 14.0.0.0
[R4-rip-1]network 10.0.0.0
[R4-rip-1]network 4.0.0.0

[R1]display ip routing-table protocol rip 
Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface
10.1.1.0/24  RIP     100  1           D   14.1.1.4        GigabitEthernet0/0/1
10.1.255.0/24  RIP     100  1           D   14.1.1.4        GigabitEthernet0/0/1

(2)路由汇总后

[R1]ospf 1 router-id 1.1.1.1
[R1-ospf-1]asbr-summary 10.1.0.0 255.255.0.0 
<R2>display ip routing-table
Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface
10.1.0.0/16  O_ASE   150  2           D   12.1.1.1        GigabitEthernet0/0/2

1 2 3 4 5 6

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