（Open Shortest Path First，OSPF）实验4

1、IP地址命令配置：
r1:
[r1]inter g0/0/0
[r1-GigabitEthernet0/0/0]ip add 16.0.0.1 24
[r1-GigabitEthernet0/0/0]inter g0/0/1
[r1-GigabitEthernet0/0/1]ip add 116.0.0.1 24
[r1-GigabitEthernet0/0/1]inter lo 0
[r1-LoopBack0]ip add 192.168.1.1 24
[r1]display ip interface brief ----查看接口命令配置

r2:
[r2]inter g0/0/0
[r2-GigabitEthernet0/0/0]ip add 26.0.0.1 24
[r2-GigabitEthernet0/0/0]inter lo 0
[r2-LoopBack0]ip add 192.168.2.1 24

r3:
[r3]inter g0/0/0
[r3-GigabitEthernet0/0/0]ip add 36.0.0.1 24
[r3-GigabitEthernet0/0/0]inter lo 0
[r3-LoopBack0]ip add 192.168.3.1 24
[r3-LoopBack0]

r4:
[r4]inter g0/0/0
[r4-GigabitEthernet0/0/0]ip add 46.0.0.1 24
[r4-GigabitEthernet0/0/0]inter lo 0
[r4-LoopBack0]ip add 192.168.4.1 24

r5:
[r5]inter g0/0/0
[r5-GigabitEthernet0/0/0]ip add 56.0.0.1 24
[r5-GigabitEthernet0/0/0]inter lo 0
[r5-LoopBack0]ip add 192.168.5.1 24

r6:
[Huawei]sys isp
[isp]inter g0/0/0
[isp-GigabitEthernet0/0/0]ip add 16.0.0.2 24
[isp-GigabitEthernet0/0/0]inter g0/0/1
[isp-GigabitEthernet0/0/1]ip add 116.0.0.2 24
[isp-GigabitEthernet0/0/1]inter g0/0/2
[isp-GigabitEthernet0/0/2]ip add 56.0.0.2 24
[isp-GigabitEthernet0/0/2]inter g4/0/0
[isp-GigabitEthernet4/0/0]ip add 46.0.0.2 24
[isp-GigabitEthernet4/0/0]inter g3/0/0
[isp-GigabitEthernet3/0/0]ip add 36.0.0.2 24
[isp-GigabitEthernet3/0/0]inter g2/0/0
[isp-GigabitEthernet2/0/0]ip add 26.0.0.2 24
因为R6作为ISP，所有就不配置环回地址了。

2、给每一台路由器配置一条指向ISP的缺省路由
目的是为了使接口之间可以Ping通
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

3、R1/R4/R5为全连的MGRE结构
E1/R4/R5之间彼此即使中心站点又是分支

先配置彼此作为中心站点的命令：
r1:
建立隧道，给隧道接口配置IP地址：
[r1]int t0/0/0
[r1-Tunnel0/0/0]ip add 192.168.6.1 24
选择封装类型为MGRE：
r1-Tunnel0/0/0]tunnel-protocol ?
gre Generic Routing Encapsulation
ipsec IPSEC Encapsulation
ipv4-ipv6 IP over IPv6 encapsulation
ipv6-ipv4 IPv6 over IP encapsulation
mpls MPLS Encapsulation
none Null Encapsulation
[r1-Tunnel0/0/0]tunnel-protocol gre p2mp
定义源IP地址（为路由器的接口物理地址）：
[r1-Tunnel0/0/0]source 16.0.0.1
创建NHRP域（所有加入这个NHRP域的私网都会向中心站点汇报隧道地址和出接口物理地址的对应关系）
NHRP 的network id具有全局意义，在整个网络中都遵循。
[r1-Tunnel0/0/0]nhrp network-id 100
在中心站点开启伪广播—分别给所有节点发送单播以达到广播的效果：
[r1-Tunnel0/0/0]nhrp entry multicast dynamic

r4:
[r4]inter 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]source 46.0.0.1
[r4-Tunnel0/0/0]nhrp network-id 100
[r4-Tunnel0/0/0]nhrp entry multicast dynamic

r5:
[r5]inter t0/0/0
[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

配置彼此作为分支的命令：
r1:
[r1]inter t0/0/0
找中心站点进行注册（entry 加入 register 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
192.168.6.2/3:中心站点的隧道地址
46/56.0.0.1：中心站点的物理接口地址

R1:
[r1-Tunnel0/0/0]inter t0/0/1
[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 111
[r1-Tunnel0/0/1]nhrp entry multicast dynamic

R2:
[r2]inter t0/0/0
[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 111
[r2-Tunnel0/0/0]nhrp entry 192.168.7.1 116.0.0.1 register

R3:
[r3]inter t0/0/0
[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 111
[r3-Tunnel0/0/0]nhrp entry 192.168.7.1 116.0.0.1 register

5、所有私有网段可以互相通讯，私有网段使用OSPF完成
R1:
[r1]ospf 1 router-id 1.1.1.1
[r1-ospf-1]area 0
宣告私有网段
[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

但是此时R1只和R2,R4建立了邻居关系（在全连的MGRE和MGRE封装中，每个选了一个做邻居）
[r1]display ip routing-table protocol ospf
[r1]display ospf peer brief