AR1：
Int lo 0
Ip add 1.1.1.1 24
Int g0/0/0
Ip add 12.1.1.1 24
Ospf 1 router-id 1.1.1.1
Area 0
Network 1.1.1.0 0.0.0.255
Network 12.1.1.0 0.0.0.255
AR2:
Int lo 0
Ip add 2.2.2.2 24
Int g0/0/1
Ip add 12.1.1.2 24
Int g0/0/0
Ip add 23.1.1.2 24
Ospf 1 router-id 2.2.2.2
Area 0
Network 2.2.2.0 0.0.0.255
Network 12.1.1.0 0.0.0.255
Area 1
Network 23.1.1.0 0.0.0.255
AR3:
Int lo 0
Ip add 3.3.3.3 24
Int g0/0/1
Ip add 23.1.1.3 24
Ospf 1 router-id 3.3.3.3
Area 1
Network 3.3.3.0 0.0.0.255
Network 23.1.1.0 0.0.0.255
路由汇总
AR3:
Int lo 1
Ip add 172.16.16.1 24
Int lo 2
Ip add 172.16.17.1 24
Int lo 3
Ip add 172.16.18.1 24
Int lo 4
Ip add 172.16.19.1 24
Ospf 1
Area 1
Network 172.16.16.0 0.0.0.255
Network 172.16.17.1 0.0.0.255
Network 172.16.18.0 0.0.0.255
Network 172.16.19.0 0.0.0.255
在AR2上做汇总
Ospf 1
Area 1
Abr-summary 172.16.16.0 255.255.252.0
外部路由引入与汇总
AR3:
Int lo 5
Ip add 192.168.0.1 24
Int lo 6
Ip add 192.168.1.1 24
Int lo 7
Ip add 192.168.2.1 24
Int lo 8
Ip add 192.168.3.1 24
Rip 1
Version 2
Undo sum
Network 192.168.0.0
Network 192.168.1.0
Network 192.168.2.0
Network 192.168.3.0
Ospf 1
Import-route rip 1
Asbr-summary 192.168.0.0 255.255.252.0
引入默认路由
default-route-advertise always