要求：
使用ospf协议实现全网可达
第一步：
给各路由器接口配置ip地址，配置环回
第二步：
由于r4、r7为isp只能配置IP地址无法运行ospf协议，所以我需要先在与isp相连的路由器上创建tunnel接口，让它们之间传递ospf协议信息
r3-r5tunnel接口配置
[r3]int Tunnel 0/0/0
[r3-Tunnel0/0/0]ip ad 10.1.1.1 24
[r3-Tunnel0/0/0]tunnel-protocol gre
[r3-Tunnel0/0/0]source g0/0/1
[r3-Tunnel0/0/0]destination 45.1.1.2
[r3-Tunnel0/0/0]ospf network-type broadcast
[r3-Tunnel0/0/0]q
[r3]ip route-static 45.1.1.0 24 34.1.1.1[r5]int Tunnel 0/0/0
[r5-Tunnel0/0/0]ip ad 10.1.1.2 24
[r5-Tunnel0/0/0]tunnel-protocol gre
[r5-Tunnel0/0/0]source g0/0/0
[r5-Tunnel0/0/0]destination 34.1.1.2
[r5-Tunnel0/0/0]ospf network-type broadcast
[r5-Tunnel0/0/0]q
[r5]ip route-static 34.1.1.0 24 45.1.1.1
r3-r5之间隧道测试
[r5]ping 10.1.1.1
PING 10.1.1.1: 56 data bytes, press CTRL_C to break
Request time out
Reply from 10.1.1.1: bytes=56 Sequence=2 ttl=255 time=30 ms
Reply from 10.1.1.1: bytes=56 Sequence=3 ttl=255 time=40 ms
Reply from 10.1.1.1: bytes=56 Sequence=4 ttl=255 time=20 ms
Reply from 10.1.1.1: bytes=56 Sequence=5 ttl=255 time=20 ms
--- 10.1.1.1 ping statistics ---
5 packet(s) transmitted
4 packet(s) received
20.00% packet loss
round-trip min/avg/max = 20/27/40 ms
[r5]r6-r8-r10-r12之间tunnel口配置
[r6]int Tunnel 0/0/0
[r6-Tunnel0/0/0]ip ad 20.1.1.1 24
[r6-Tunnel0/0/0]tunnel-protocol gre p2mp
[r6-Tunnel0/0/0]source g0/0/1
Jan 1 2023 14:05:39-08:00 r6 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface Tunnel0/0/0 has entered the UP state.
[r6-Tunnel0/0/0]nhrp entry multicast dynamic
[r6-Tunnel0/0/0]nhrp network-id 100
[r6-Tunnel0/0/0]ospf network-type broadcast
[r6-Tunnel0/0/0]q
[r6]ip route-static 78.1.1.0 24 67.1.1.1
[r6]ip route-static 17.1.1.0 24 67.1.1.1
[r6]ip route-static 27.1.1.0 24 67.1.1.1
[r8]int Tunnel 0/0/0
[r8-Tunnel0/0/0]ip ad 20.1.1.2 24
[r8-Tunnel0/0/0]tunnel-protocol gre p2mp
[r8-Tunnel0/0/0]source g0/0/0
Jan 1 2023 14:17:44-08:00 r8 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface Tunnel0/0/0 has entered the UP state.
[r8-Tunnel0/0/0]nhrp entry 20.1.1.1 67.1.1.2 register
[r8-Tunnel0/0/0]nhrp network-id 100
[r8-Tunnel0/0/0]ospf network-type broadcast
[r8-Tunnel0/0/0]q
[r8]ip route-static 67.1.1.0 24 78.1.1.1
[r8]ip route-static 17.1.1.0 24 78.1.1.1
[r8]ip route-static 27.1.1.0 24 78.1.1.1
[r10]int Tunnel 0/0/0
[r10-Tunnel0/0/0]ip ad 20.1.1.3 24
[r10-Tunnel0/0/0]tunnel-protocol gre p2mp
[r10-Tunnel0/0/0]nhrp entry 20.1.1.1 67.1.1.2 register
[r10-Tunnel0/0/0]nhrp network-id 100
[r10-Tunnel0/0/0]ospf network-type broadcast
[r10-Tunnel0/0/0]source g0/0/0
Jan 1 2023 14:22:31-08:00 r10 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface Tunnel0/0/0 has entered the UP state.
[r10-Tunnel0/0/0]q
[r10]ip route-static 67.1.1.0 24 17.1.1.1
[r10]ip route-static 78.1.1.0 24 17.1.1.1
[r10]ip route-static 27.1.1.0 24 17.1.1.1
[r12]int Tunnel 0/0/0
[r12-Tunnel0/0/0]ip ad 20.1.1.3 24
[r12-Tunnel0/0/0]tunnel-protocol gre p2mp
[r12-Tunnel0/0/0]source g0/0/0
Jan 1 2023 14:24:40-08:00 r12 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface Tunnel0/0/0 has entered the UP state.
[r12-Tunnel0/0/0]nhrp entry 20.1.1.1 67.1.1.2 register
[r12-Tunnel0/0/0]nhrp network-id 100
[r12-Tunnel0/0/0]ospf network-type broadcast
[r12-Tunnel0/0/0]q
[r12]ip route-static 67.1.1.0 24 27.1.1.1
[r12]ip route-static 78.1.1.0 24 27.1.1.1
[r12]ip route-static 17.1.1.0 24 27.1.1.1
第三步：
在各路由器上启用ospf协议，按照图示宣告接口
第四步：
对于ospf1进程area0与ospf100进程之间的互通我们使用tunnle隧道实现，将r3上的tunnel隧道接口地址宣告到ospf1 area0，r5上的tunnel隧道接口地址宣告到ospf100 area0，即可实现互通相互学习。对于area2与area0非直连的情况我们在这选择在r13-r14上配置ospf虚链路vlink，配置如下
r13]ospf 100
[r13-ospf-100]are
[r13-ospf-100]area 1
[r13-ospf-100-area-0.0.0.1]v
[r13-ospf-100-area-0.0.0.1]vlink-peer 14.14.14.14
[r14]ospf 100
[r14-ospf-100]are
[r14-ospf-100]area 1
[r14-ospf-100-area-0.0.0.1]v
[r14-ospf-100-area-0.0.0.1]vlink-peer 13.13.13.13
最后：
全网可达已经实现了，结果展示
r1上已经学到所有网段路由
r15上也已经学到所有网段路由
ping测试
文章来源：https://www.toymoban.com/news/detail-517427.html
试验结束！！！文章来源地址https://www.toymoban.com/news/detail-517427.html
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