如何配置NSSA区域？

3.1 问题

如图配置设备IP地址和OSPF区域
R4去往ISP，使用的是静态的默认路由
R1去往合作公司，使用的也是静态路由，仅需要访问 PC-1 即可
区域 123 不允许出现 5类 LSA
确保 PC-1 和 Server-1 互通

3.2 方案

搭建实验环境，如图-3所示。

图-3
3.3 步骤

实现此案例需要按照如下步骤进行。

1）配置终端设备

PC1：
   192.168.10.1 
   255.255.255.0
   192.168.10.254
Server1:
   192.168.20.1
   255.255.255.0
   192.168.20.254

2）配置IP地址和基本OSPF

<Huawei>undo terminal monitor     
<Huawei>system-view 
[Huawei]sysname R1
[R1]interface GigabitEthernet 0/0/0
[R1-GigabitEthernet0/0/0]ip address  192.168.12.1 24
[R1-GigabitEthernet0/0/0]quit
[R1]interface GigabitEthernet 0/0/1
[R1-GigabitEthernet0/0/1]ip address  192.168.16.1 24
[R1-GigabitEthernet0/0/1]quit
[R1]ospf 1 router-id  1.1.1.1   //启用OSPF，配置 router-id 为 1.1.1.1
[R1-ospf-1]area  123    
[R1-ospf-1-area-0.0.0.123]network  192.168.12.0 0.0.0.255
[R1-ospf-1-area-0.0.0.123]quit
[R1-ospf-1]quit
<Huawei>undo terminal monitor     
<Huawei>system-view 
[Huawei]sysname R2
[R2]interface GigabitEthernet 0/0/1
[R2-GigabitEthernet0/0/1]ip address  192.168.12.2 24
[R2-GigabitEthernet0/0/1]quit
[R2]interface GigabitEthernet 0/0/0
[R2-GigabitEthernet0/0/0]ip address  192.168.23.2 24
[R2-GigabitEthernet0/0/0]quit
[R2]ospf 1 router-id  2.2.2.2   //启用OSPF，配置 router-id 为 2.2.2.2
[R2-ospf-1]area  123    
[R2-ospf-1-area-0.0.0.123]network  192.168.12.0 0.0.0.255
[R2-ospf-1-area-0.0.0.123]network  192.168.23.0 0.0.0.255
[R2-ospf-1-area-0.0.0.123]quit
[R2-ospf-1]quit
<Huawei>undo terminal monitor     
<Huawei>system-view 
[Huawei]sysname R3
[R3]interface GigabitEthernet 0/0/1
[R3-GigabitEthernet0/0/1]ip address  192.168.23.3 24
[R3-GigabitEthernet0/0/1]quit
[R3]interface GigabitEthernet 0/0/0
[R3-GigabitEthernet0/0/0]ip address  192.168.34.3 24
[R3-GigabitEthernet0/0/0]quit
[R3]ospf 1 router-id  3.3.3.3   //启用OSPF，配置 router-id 为 3.3.3.3
[R3-ospf-1]area  123    
[R3-ospf-1-area-0.0.0.123]network  192.168.23.0 0.0.0.255
[R3-ospf-1-area-0.0.0.123]quit
[R3-ospf-1]area 0    
[R3-ospf-1-area-0.0.0.0]network  192.168.34.0 0.0.0.255
[R3-ospf-1]quit
<Huawei>undo terminal monitor     
<Huawei>system-view 
[Huawei]sysname R4
[R4]interface GigabitEthernet 0/0/1
[R4-GigabitEthernet0/0/1]ip address  192.168.34.4 24
[R4-GigabitEthernet0/0/1]quit
[R4]interface GigabitEthernet 0/0/0
[R4-GigabitEthernet0/0/0]ip address  192.168.45.4 24
[R4-GigabitEthernet0/0/0]quit
[R4]ospf 1 router-id   4.4.4.4   //启用OSPF，配置 router-id 为 4.4.4.4
[R4-ospf-1]area 0    
[R4-ospf-1-area-0.0.0.0]network  192.168.34.0 0.0.0.255
[R4-ospf-1]quit
<Huawei>undo terminal monitor     
<Huawei>system-view 
[Huawei]sysname R5
[R5]interface GigabitEthernet 0/0/1
[R5-GigabitEthernet0/0/1]ip address  192.168.45.5 24
[R5-GigabitEthernet0/0/1]quit
[R5]interface GigabitEthernet 0/0/2
[R5-GigabitEthernet0/0/2]ip address  192.168.20.254 24
[R5-GigabitEthernet0/0/2]quit
[R5] ip route-static 192.168.0.0 16  192.168.45.4 //配置去往其他网段的路由条目
<Huawei>undo terminal monitor     
<Huawei>system-view 
[Huawei]sysname R6
[R6]interface GigabitEthernet 0/0/0
[R6-GigabitEthernet0/0/1]ip address  192.168.16.6 24
[R6-GigabitEthernet0/0/1]quit
[R6]interface GigabitEthernet 0/0/2
[R6-GigabitEthernet0/0/2]ip address  192.168.10.254 24
[R6-GigabitEthernet0/0/2]quit
[R6] ip route-static  192.168.0.0  255.255.0.0  192.168.16.1 //配置去往其他网段的路由条目

3）配置区域123为 NSSA 区域

[R1]ospf 1
[R1-ospf-1]area  123    
[R1-ospf-1-area-0.0.0.123]nssa   //配置该区域为 NSSA 区域
[R1-ospf-1-area-0.0.0.123]quit
[R2]ospf 1
[R2-ospf-1]area  123    
[R2-ospf-1-area-0.0.0.123]nssa   //配置该区域为 NSSA 区域
[R2-ospf-1-area-0.0.0.123]quit
[R3]ospf 1
[R3-ospf-1]area  123    
[R3-ospf-1-area-0.0.0.123]nssa   //配置该区域为 NSSA 区域
[R3-ospf-1-area-0.0.0.123]quit

4）配置 R1 引入 合作公司的外部路由

[R1]ip route-static 192.168.10.0 24 192.168.16.6  //去往合作公司的路由条目
[R1]ospf 1 
[R1-ospf-1]import-route static  //将静态路由引入到 OSPF 协议

5）配置 R4 引入 去往外部网络的路由

[R4]ip route-static 0.0.0.0 0 192.168.45.5  //配置去往服务器的路由条目
[R4]ospf 1 
[R4-ospf-1]default-route-advertise   //配置OSPF产生默认路由

6）测试 PC1 和 Server-1的连通性

PC1>ping 192.168.20.1   //在 PC1 ping Server1，可以互通
Ping 192.168.20.1: 32 data bytes, Press Ctrl_C to break
From 192.168.20.1: bytes=32 seq=1 ttl=125 time=31 ms
From 192.168.20.1: bytes=32 seq=2 ttl=125 time=31 ms
From 192.168.20.1: bytes=32 seq=3 ttl=125 time=16 ms
From 192.168.20.1: bytes=32 seq=4 ttl=125 time=16 ms
From 192.168.20.1: bytes=32 seq=5 ttl=125 time=31 ms
--- 192.168.20.1 ping statistics ---
  5 packet(s) transmitted