实验拓扑
实验需求
1，R6为ISP只能配置IP地址，R1-R5的环回为私有网段
2，R1/4/5为全连的MGRE结构，R1/2/3为星型的拓扑结构，R1为中心站点
3，所有私有网段可以互相通讯，私有网段夜用OSPF完成。
实验步骤如下
ip地址分配
r1
r2
r3
r4
r5
r6
配置缺省
[r1]ip route-static 0.0.0.0 0 16.0.0.2
[r1]ip route-static 0.0.0.0 0 116.0.0.2
[r2]ip route-static 0.0.0.0 0 26.0.0.2
[r3]ip route-static 0.0.0.0 0 36.0.0.2
[r4]ip route-static 0.0.0.0 0 46.0.0.2
[r5]ip route-static 0.0.0.0 0 56.0.0.2
搭建MGRE环境
R1/4/5全连的mgre环境,每个路由器都是中心站点
[r1]int t 0/0/0
[r1-Tunnel0/0/0]ip add 192.168.6.1 24
[r1-Tunnel0/0/0]tunnel-protocol gre p2mp
[r1-Tunnel0/0/0]source 16.0.0.1
[r1-Tunnel0/0/0]nhrp network-id 100
[r1-Tunnel0/0/0]nhrp entry multicast dynamic
[r4]int t 0/0/0
[r4-Tunnel0/0/0]ip add 192.168.6.2 24
[r4-Tunnel0/0/0]tunnel-protocol gre p2mp
[r4-Tunnel0/0/0]nhrp network-id 100
[r4-Tunnel0/0/0]nhrp entry multicast dynamic
[r4-Tunnel0/0/0]source 46.0.0.1
[r5]int t 0/0/0
[r5-Tunnel0/0/0]ip add 192.168.6.3 24
[r5-Tunnel0/0/0]tunnel-protocol gre p2mp
[r5-Tunnel0/0/0]source 56.0.0.1
[r5-Tunnel0/0/0]nhrp network-id 100
[r5-Tunnel0/0/0]nhrp entry multicast dynamic
R1/4/5互相注册
[r1-Tunnel0/0/0]nhrp entry 192.168.6.2 46.0.0.1 register
[r1-Tunnel0/0/0]nhrp entry 192.168.6.3 56.0.0.1 register
[r4-Tunnel0/0/0]nhrp entry 192.168.6.1 16.0.0.1 register
[r4-Tunnel0/0/0]nhrp entry 192.168.6.3 56.0.0.1 register
[r5-Tunnel0/0/0]nhrp entry 192.168.6.1 16.0.0.1 register
[r5-Tunnel0/0/0]nhrp entry 192.168.6.2 46.0.0.2 register
R1/2/3星型拓扑结构
[r1]int t 0/0/1
[r1-Tunnel0/0/1]ip add 192.168.7.1 24
[r1-Tunnel0/0/1]tunnel-protocol gre p2mp
[r1-Tunnel0/0/1]source 116.0.0.1
[r1-Tunnel0/0/1]nhrp network-id 110
[r1-Tunnel0/0/1]nhrp entry multicast dynamic
[r2]int t 0/0/0
[r2-Tunnel0/0/0]ip add 192.168.7.2 24
[r2-Tunnel0/0/0]tunnel-protocol gre p2mp
[r2-Tunnel0/0/0]source GigabitEthernet 0/0/0
[r2-Tunnel0/0/0]nhrp network-id 110
[r2-Tunnel0/0/0]nhrp entry 192.168.7.1 116.0.0.1 register
[r3]int t 0/0/0
[r3-Tunnel0/0/0]ip add 192.168.7.3 24
[r3-Tunnel0/0/0]tunnel-protocol gre p2mp
[r3-Tunnel0/0/0]source GigabitEthernet 0/0/0
[r3-Tunnel0/0/0]nhrp network-id 110
[r3-Tunnel0/0/0]nhrp entry 192.168.7.1 116.0.0.1 register
OSPF配置
[r1]ospf 1 router-id 1.1.1.1
[r1-ospf-1]a
[r1-ospf-1]area 0
[r1-ospf-1-area-0.0.0.0]n
[r1-ospf-1-area-0.0.0.0]ne
[r1-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
[r1-ospf-1-area-0.0.0.0]network 192.168.6.0 0.0.0.255
[r1-ospf-1-area-0.0.0.0]network 192.168.7.0 0.0.0.255
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]a
[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]ne
[r2-ospf-1-area-0.0.0.0]network 192.168.2.0 0.0.0.255
[r2-ospf-1-area-0.0.0.0]network 192.168.7.0 0.0.0.255
[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]a
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]net
[r3-ospf-1-area-0.0.0.0]network 192.168.3.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 192.168.7.0 0.0.0.255
[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0]net
[r4-ospf-1-area-0.0.0.0]network 192.168.4.0 0.0.0.255
[r4-ospf-1-area-0.0.0.0]network 192.168.6.0 0.0.0.255
[r5]ospf 1 r
[r5]ospf 1 router-id 5.5.5.5
[r5-ospf-1]a
[r5-ospf-1]area 0
[r5-ospf-1-area-0.0.0.0]net
[r5-ospf-1-area-0.0.0.0]network 192.168.5.0 0.0.0.255
[r5-ospf-1-area-0.0.0.0]network 192.168.6.0 0.0.0.255
测试发现并没有配置成功
修改r1/4/5接口为broadcast口
[r1]int t 0/0/0
[r1-Tunnel0/0/0]os
[r1-Tunnel0/0/0]ospf n
[r1-Tunnel0/0/0]ospf network-type b
[r1-Tunnel0/0/0]ospf network-type broadcast
[r4]int t0/0/0
[r4-Tunnel0/0/0]o
[r4-Tunnel0/0/0]ospf n
[r4-Tunnel0/0/0]ospf network-type b
[r4-Tunnel0/0/0]ospf network-type broadcast
[r5]int t0/0/0
[r5-Tunnel0/0/0]ospf network-type b
[r5-Tunnel0/0/0]ospf network-type broadcast
修改r1/2、3接口为broadcast口
[r1]int t0/0/1
[r1-Tunnel0/0/1]ospf network-type broadcast
[r2]int t0/0/0
[r2-Tunnel0/0/0]ospf network-type broadcast
[r3]int t0/0/0
[r3-Tunnel0/0/0]ospf network-type broadcast
[r1-Tunnel0/0/1]ospf dr-priority 10 //修改优先级
继续重启ospf进程
reset ospf 1 process
Warning: The OSPF process will be reset. Continue? [Y/N]:y
reset ospf 1 process
Warning: The OSPF process will be reset. Continue? [Y/N]:y
DR认知一致，选举成功
ping命令测试
ospf配置成功，实验完成
