实验要求

1.R6为ISP只能配置IP地址,R1-R5的环回为私有网段
2.R1,R4,R5为 全连的MGRE结构,R1,R2,R3为星型的拓扑结构,R1为中心站点
3.所有私有网段可以相互通讯,私有网段使用OSPF来完成
一、合理划分IP地址
拓扑图:

二、配置底层
R1:
[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip ad 16.0.0.1 24
[r1-GigabitEthernet0/0/0]int g0/0/1
[r1-GigabitEthernet0/0/1]ip ad 116.0.0.1 24
[r1-GigabitEthernet0/0/1]int lo0
[r1-LoopBack0]ip ad 192.168.1.1 24
[r1]display ip interface brief

R2:
[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ip ad 26.0.0.1 24
[r2-GigabitEthernet0/0/0]int lo 0
[r2-LoopBack0]ip ad 192.168.2.1 24
[r2]display ip interface brief

R3:
[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ip ad 36.0.0.1 24
[r3-GigabitEthernet0/0/0]int lo0
[r3-LoopBack0]ip ad 192.168.3.1 24
[r3]display ip interface brief

R4:
[r4]int g0/0/0
[r4-GigabitEthernet0/0/0]ip ad 46.0.0.1 24
[r4-GigabitEthernet0/0/0]int lo0
[r4-LoopBack0]ip ad 192.168.4.1 24
[r4]display ip interface brief

R5:
[r5]int g0/0/0
[r5-GigabitEthernet0/0/0]ip ad 56.0.0.1 24
[r5-GigabitEthernet0/0/0]int lo0
[r5-LoopBack0]ip ad 192.168.5.1 24
[r5]display ip interface brief

isp:
[isp]int g0/0/0
[isp-GigabitEthernet0/0/0]ip ad 16.0.0.2 24
[isp-GigabitEthernet0/0/0]int g0/0/1
[isp-GigabitEthernet0/0/1]ip ad 116.0.0.2 24
[isp-GigabitEthernet0/0/1]int g0/0/2
[isp-GigabitEthernet0/0/2]ip ad 56.0.0.2 24
[isp-GigabitEthernet0/0/2]int g4/0/0
[isp-GigabitEthernet4/0/0]ip ad 26.0.0.2 24
[isp-GigabitEthernet4/0/0]int g4/0/1
[isp-GigabitEthernet4/0/1]ip ad 36.0.0.2 24
[isp-GigabitEthernet4/0/1]int g4/0/2
[isp-GigabitEthernet4/0/2]ip ad 46.0.0.2 24
[isp]display ip interface brief

三、实现公网通
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
各路由写缺省:
R1:
[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:
[r2]ip route-static 0.0.0.0 0 26.0.0.2
R3:
[r3]ip route-static 0.0.0.0 0 36.0.0.2
R4:
[r4]ip route-static 0.0.0.0 0 46.0.0.2
R5:
[r5]ip route-static 0.0.0.0 0 56.0.0.2
检测:

四、搭建MGRE环境
1.搭建中心到站点的MGRE环境
R1-R2-R3(7.0网段)
R1作为中心站点:
[r1]int t 0/0/0
[r1-Tunnel0/0/0]ip add 192.168.7.1 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
R2为分支站点:
[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 g 0/0/0
[r2-Tunnel0/0/0]nhrp network-id 100
[r2-Tunnel0/0/0]nhrp entry 192.168.7.1 16.0.0.1 register
R3:
[r3]int t 0/0/0
[r3-Tunnel0/0/0]ip ad 192.168.7.3 24
[r3-Tunnel0/0/0]tunnel-protocol gre p2mp
[r3-Tunnel0/0/0]source g 0/0/0
[r3-Tunnel0/0/0]nhrp network-id 100
[r3-Tunnel0/0/0]nhrp entry 192.168.7.1 16.0.0.1 register
检测:
[r1]display nhrp peer all

2.搭建全连的MGRE环境
R1-R4-R5 全连(6.0网段)
R1:
[r1]int t 0/0/1
[r1-Tunnel0/0/1]ip add 192.168.6.1 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
[r1-Tunnel0/0/1]nhrp entry 192.168.6.2 46.0.0.1 register
[r1-Tunnel0/0/1]nhrp entry 192.168.6.3 56.0.0.1 register
R4:
[r4]int t 0/0/1
[r4-Tunnel0/0/1]ip ad 192.168.6.2 24
[r4-Tunnel0/0/1]tunnel-protocol gre p2mp
[r4-Tunnel0/0/1]source 46.0.0.1
[r4-Tunnel0/0/1]nhrp network-id 110
[r4-Tunnel0/0/1]nhrp entry multicast dynamic
[r4-Tunnel0/0/1]nhrp entry 192.168.6.1 116.0.0.1 register
[r4-Tunnel0/0/1]nhrp entry 192.168.6.3 56.0.0.1 register
R5:
[r5]int t 0/0/1
[r5-Tunnel0/0/1]ip add 192.168.6.3 24
[r5-Tunnel0/0/1]tunnel-protocol gre p2mp
[r5-Tunnel0/0/1]source 56.0.0.1
[r5-Tunnel0/0/1]nhrp network-id 110
[r5-Tunnel0/0/1]nhrp entry multicast dynamic
[r5-Tunnel0/0/1]nhrp entry 192.168.6.1 116.0.0.1 register
[r5-Tunnel0/0/1]nhrp entry 192.168.6.2 46.0.0.1 register
检测:
[r1]display nhrp peer all

3.启动OSPF协议
获取整个私网中未知网段的信息
R1:
[r1]ospf 1 router-id 1.1.1.1
[r1-ospf-1]area 0
[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:
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]area 0
[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:
[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]area 0
[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:
[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]area 0
[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:
[r5]ospf 1 router-id 5.5.5.5
[r5-ospf-1]area 0
[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
ospf在中心到站点的MGRE环境下,R1-R2-R3 接口工作类型改为P2MP
R1:
[r1]int t0/0/0
[r1-Tunnel0/0/0]ospf network-type p2mp
R2:
[r2]int t0/0/0
[r2-Tunnel0/0/0]ospf network-type p2mp
R3:
[r3]int t0/0/0
[r3-Tunnel0/0/0]ospf network-type p2mp
ospf在全连的MGRE环境下,R1-R4-R5接口工作类型改为broadcast
R1:
[r1]int t0/0/1
[r1-Tunnel0/0/1]ospf network-type broadcast
R4:
[r4]int t0/0/1
[r4-Tunnel0/0/0]ospf network-type broadcast
R5:
[r5]int t0/0/1
[r5-Tunnel0/0/1]ospf network-type broadcast
检测:
[r1]display ospf peer brief

[r1]display ip routing-table protocol ospf


本文档详细介绍了在MGRE环境下如何进行OSPF实验,包括IP地址的合理划分,底层网络配置,公网通信的实现,以及MGRE环境的搭建。实验涉及全连接和星型拓扑结构,通过OSPF协议确保所有私有网段可以相互通讯。
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