(open shortest path first, OSPF) Experiment 4

1、IP Address command configuration ：
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 ---- View the interface command configuration

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
because R6 As ISP, So the loopback address is not configured .

2、 Configure each router with a line pointing ISP The default route for
The purpose is to make interfaces Ping through
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 For the whole company MGRE structure
E1/R4/R5 Even if the central site is a branch

First configure the commands of each other as central sites ：
r1:
Build a tunnel , Configure the tunnel interface IP Address ：
[r1]int t0/0/0
[r1-Tunnel0/0/0]ip add 192.168.6.1 24
Select the package type as 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
Definition source IP Address （ Is the physical address of the router interface ）：
[r1-Tunnel0/0/0]source 16.0.0.1
establish NHRP Domain （ All join this NHRP The private network of the domain will report the corresponding relationship between the tunnel address and the physical address of the outgoing interface to the central site ）
NHRP Of network id Of global significance , Follow throughout the network .
[r1-Tunnel0/0/0]nhrp network-id 100
Start pseudo broadcasting at the central site — Unicast is sent to all nodes respectively to achieve the effect of broadcasting ：
[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

Configure commands that branch from each other ：
r1:
[r1]inter t0/0/0
Find a central site to register （entry Join in register register ）:
[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: The tunnel address of the central station
46/56.0.0.1： Physical interface address of the central site

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、 All private network segments can communicate with each other , Private network segment use OSPF complete
R1:
[r1]ospf 1 router-id 1.1.1.1
[r1-ospf-1]area 0
Declare private network segment
[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

But at this time R1 And the only R2,R4 Established a neighborhood relationship （ In the company's MGRE and MGRE In package , Each chose a neighbor ）
[r1]display ip routing-table protocol ospf
[r1]display ospf peer brief