2021-03-10

实验要求：
r1-r3为区域0 ，r3-r4为区域1，r3的环回也在区域0
r1-r3,r3为dr设备，没有bdr
r4环回地址已固定，其他所有网段使用192.168.1.0/24进行合理分配
r4环回不能宣告，全网可达，保障更新安全，避免环路，减少路由条目
步骤：
1）划分子网
2）配置ip以及换回地址
3）启动ospf，划分区域并宣告网段
4）将r1,r2的端口优先级改为0，使其放弃dr和bdr的选举
5）边界路由器配置缺省
6）在路由器接口配置密文认证
7）在中间路由器上进行汇总
配置命令：
[1]

sysname 1

interface GigabitEthernet0/0/0
ip address 192.168.1.1 255.255.255.192
ospf authentication-mode md5 1 cipher % % Cq;\C|^9kW=sSD&C|MH@~kC3% % 端口加密
ospf dr-priority 0

interface LoopBack0
ip address 192.168.1.65 255.255.255.240

ospf 1 router-id 1.1.1.1
area 0.0.0.0
network 192.168.1.0 0.0.0.255
R2

sysname 2

interface GigabitEthernet0/0/0
ip address 192.168.1.2 255.255.255.192
ospf authentication-mode md5 1 cipher % % vi\BGtv!p:fN6E/_=Pk(kze% %
ospf dr-priority 0

interface LoopBack0
ip address 192.168.1.81 255.255.255.240

ospf 1 router-id 2.2.2.2
area 0.0.0.0
network 192.168.1.0 0.0.0.255
R3

sysname 3

interface GigabitEthernet0/0/0
ip address 192.168.1.3 255.255.255.192
ospf authentication-mode md5 1 cipher Xg&0;n6czPjKUGU-KkpB{k>#

interface GigabitEthernet0/0/1
ip address 192.168.1.129 255.255.255.192

interface LoopBack0
ip address 192.168.1.97 255.255.255.240

ospf 1 router-id 3.3.3.3
area 0.0.0.0
abr-summary 192.168.1.0 255.255.255.128 网段汇总
network 192.168.1.3 0.0.0.0
network 192.168.1.97 0.0.0.0
area 0.0.0.1
abr-summary 192.168.1.128 255.255.255.128
network 192.168.1.129 0.0.0.0
R4

sysname 4

interface GigabitEthernet0/0/0
ip address 192.168.1.130 255.255.255.192

interface LoopBack0
ip address 4.4.4.1 255.255.255.0

ospf 1 router-id 4.4.4.4
default-route-advertise always 缺省
area 0.0.0.1
network 192.168.1.0 0.0.0.255