问题描述：
一.分别配地址
具体请参考（网络基础五，里面有详细的IP地址划分），划分后的效果图
第二.配置IP地址和环回接口
AR1
[Huawei-GigabitEthernet0/0/0]ip add 192.168.1.1 29
Sep 13 2021 23:17:35-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[0]:The line protocol
IP on the interface GigabitEthernet0/0/0 has entered the UP state.
[Huawei-GigabitEthernet0/0/0]int l0
[Huawei-LoopBack0]ip add 192.168.1.33 28
AR2
[Huawei]int g 0/0/0
[Huawei-GigabitEthernet0/0/0]ip add 192.168.1.2 29
Sep 13 2021 23:18:32-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[0]:The line protocol
IP on the interface GigabitEthernet0/0/0 has entered the UP state.
[Huawei-GigabitEthernet0/0/0]int l0
[Huawei-LoopBack0]ip add 192.168.1.65 28
AR3
[Huawei]int g 0/0/0
[Huawei-GigabitEthernet0/0/0]ip add 192.168.1.3 29
Sep 13 2021 23:19:35-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[0]:The line protocol
IP on the interface GigabitEthernet0/0/0 has entered the UP state.
[Huawei]int g 0/0/1
[Huawei-GigabitEthernet0/0/1]ip add 192.168.1.10 29
Sep 13 2021 23:24:34-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[13]:The line protoco
l IP on the interface GigabitEthernet0/0/1 has entered the UP state.
[Huawei-GigabitEthernet0/0/0]int l0
[Huawei-LoopBack0]ip add 192.168.1.97 28
AR4
[Huawei]int g 0/0/0
[Huawei-GigabitEthernet0/0/0]ip add 192.168.1.9 29
[Huawei-GigabitEthernet0/0/0]
Sep 13 2021 23:20:30-08:00 Huawei %%01IFNET/4/LINK_STATE(l)[0]:The line protocol
IP on the interface GigabitEthernet0/0/0 has entered the UP state.
[Huawei-GigabitEthernet0/0/0]int l0
[Huawei-LoopBack0]ip add 4.4.4.1 24
第三步.配置OSPF
AR1
[Huawei]ospf 1 ro
[Huawei]ospf 1 router-id 1.1.1.1
[Huawei-ospf-1]area 1
[Huawei-ospf-1-area-0.0.0.1]net
[Huawei-ospf-1-area-0.0.0.1]network 192.168.1.1 0.0.0.0
[Huawei-ospf-1-area-0.0.0.1]net
[Huawei-ospf-1-area-0.0.0.1]network 192.168.1.33 0.0.0.0
[Huawei-ospf-1-area-0.0.0.1]
AR2
[Huawei]ospf 1 ro
[Huawei]ospf 1 router-id 2.2.2.2
[Huawei-ospf-1]area 1
[Huawei-ospf-1-area-0.0.0.1]net
[Huawei-ospf-1-area-0.0.0.1]network 192.168.1.2 0.0.0.0
[Huawei-ospf-1-area-0.0.0.1]net
[Huawei-ospf-1-area-0.0.0.1]network 192.168.1.65 0.0.0.0
AR3
[Huawei]ospf 1 ro
[Huawei]ospf 1 router-id 3.3.3.3
[Huawei-ospf-1]area 1
[Huawei-ospf-1-area-0.0.0.1]net
[Huawei-ospf-1-area-0.0.0.1]network 192.168.1.3 0.0.0.0
[Huawei-ospf-1-area-0.0.0.1]
[Huawei-ospf-1-area-0.0.0.1]net
[Huawei-ospf-1-area-0.0.0.1]network 192.168.1.97 0.0.0.0
[Huawei-ospf-1-area-0.0.0.1]
/下面是区域2
[Huawei-ospf-1]area 2
[Huawei-ospf-1-area-0.0.0.2]net
[Huawei-ospf-1-area-0.0.0.2]network 192.168.1.10 0.0.0.0
AR4
[Huawei]ospf 1 ro
[Huawei]ospf 1 router-id 4.4.4.4
[Huawei-ospf-1]area 2
[Huawei-ospf-1-area-0.0.0.2]net
[Huawei-ospf-1-area-0.0.0.2]network 192.168.1.9 0.0.0.0
配置完成几台路由器后都有OSPF的通信流程，效果如下
Sep 13 2021 23:22:35-08:00 Huawei %%01OSPF/4/NBR_CHANGE_E(l)[1]:Neighbor changes
event: neighbor status changed. (ProcessId=256, NeighborAddress=2.1.168.192, Ne
ighborEvent=HelloReceived, NeighborPreviousState=Down, NeighborCurrentState=Init
)
[Huawei-ospf-1-area-0.0.0.1]
Sep 13 2021 23:22:39-08:00 Huawei %%01OSPF/4/NBR_CHANGE_E(l)[2]:Neighbor changes
event: neighbor status changed. (ProcessId=256, NeighborAddress=2.1.168.192, Ne
ighborEvent=2WayReceived, NeighborPreviousState=Init, NeighborCurrentState=ExSta
rt)
[Huawei-ospf-1-area-0.0.0.1]
Sep 13 2021 23:22:39-08:00 Huawei %%01OSPF/4/NBR_CHANGE_E(l)[3]:Neighbor changes
event: neighbor status changed. (ProcessId=256, NeighborAddress=2.1.168.192, Ne
ighborEvent=NegotiationDone, NeighborPreviousState=ExStart, NeighborCurrentState
=Exchange)
[Huawei-ospf-1-area-0.0.0.1]
Sep 13 2021 23:22:39-08:00 Huawei %%01OSPF/4/NBR_CHANGE_E(l)[4]:Neighbor changes
event: neighbor status changed. (ProcessId=256, NeighborAddress=2.1.168.192, Ne
ighborEvent=ExchangeDone, NeighborPreviousState=Exchange, NeighborCurrentState=L
oading)
因为让AR3作为DR,而没有DBR，所以将除AR3之外的路由器都修改优先级，加一行代码如下：
[Huawei-GigabitEthernet0/0/0]ospf dr-priority 0三.配置缺省路由
因为AR4的环回没有宣告，但要求实现全网可达，所以给边界路由器AR4配置缺省路由
[Huawei-ospf-1]default-route-advertise四.手工认证（安全性）
手工认证是相对应的，缺一不可，若只在一个接口配置，则另一方接受不到信息，出错
AR1
[Huawei-GigabitEthernet0/0/0]ospf authentication-mode md5 1 cipher 123456
AR3
[Huawei-GigabitEthernet0/0/0]ospf authentication-mode md5 1 cipher 123456上面配置的是与AR3的0/0/0接口对应的，AR3 0/0/1接口同样方法配置即可