OSPF experiment in mGRE environment

Catalog

The experimental requirements

Experimental process

1, Allocate network segments according to traditional methods

2, build MGRE Environmental Science

Complete the construction of star structure

  Complete the topology of the whole company

3, start-up OSPF Get the topology information of the entire unknown network segment  

The experimental requirements

1,r6 by isp You can only configure ip Address ,r1-r5 The loopback of is a private network segment

2,r1/4/5 For the whole company MGRE structure ,r1/2/3 It is a star topology ,r1 For the central site

3, All private network segments can communicate with each other , Private network segment use OSPF To complete

Experimental process

1, Allocate network segments according to traditional methods

R1

[r1]int g0/0/1
[r1-GigabitEthernet0/0/1]ip add 116.0.0.1 24
[r1-GigabitEthernet0/0/1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 16.0.0.1 24
[r1-GigabitEthernet0/0/0]int l0
[r1-LoopBack0]ip add 192.168.1.1 24

[r1]ip route-static 0.0.0.0 0 116.0.0.2
[r1]ip route-static 0.0.0.0 0 16.0.0.2
 

R2/3/4/5/6 ditto

The public network will be connected  

2, build MGRE Environmental Science

Complete the construction of star structure

R1 Central site
[r1]int Tunnel 0/0/0
[r1-Tunnel0/0/0]ip address 192.168.7.1 24 
[r1-Tunnel0/0/0]tunnel-protocol gre p2mp 
[r1-Tunnel0/0/0]source 16.0.0.1
Jul 12 2022 21:21:27-08:00 r1 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/0 has entered the UP state. 
[r1-Tunnel0/0/0]
[r1-Tunnel0/0/0]nhrp network-id 100  --- establish nhrp Domain to automatically exchange for the target ip
[r1-Tunnel0/0/0]nhrp entry multicast dynamic   --- Enable pseudo broadcast

Branch R2
[r2]int Tunnel 0/0/0
[r2-Tunnel0/0/0]ip add 192.168.7.2 24  
[r2-Tunnel0/0/0]tunnel-protocol gre p2mp  --- Define the encapsulation type
[r2-Tunnel0/0/0]source g0/0/0
Jul 12 2022 21:28:03-08:00 r2 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/0 has entered the UP state. 
[r2-Tunnel0/0/0]nhrp network-id 100  --- Join in nhrp Domain
[r2-Tunnel0/0/0]nhrp entry 192.168.7.1 16.0.0.1 register  --- Find a registration center

R3 ditto

  Complete the topology of the whole company

R1

[r1]int Tunnel 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 
Jul 12 2022 21:40:11-08:00 r1 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/1 has entered the UP state. 
[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,R5 ditto （ Undertake the central site respectively , And register with each other ）

The private network is connected

3, start-up OSPF Get the topology information of the entire unknown network segment  

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

R2/3/4/5 ditto

  Point to point working mode can only establish a neighbor relationship , It will lead to incomplete information acquisition of unknown network segments . in consideration of DR and BDR The election may not be unified , You can choose P2MP type

R1

[r1]int t0/0/0
[r1-Tunnel0/0/0]ospf ne    
[r1-Tunnel0/0/0]ospf network-type p2mp

R2/3 ditto

In the company's MGRE In the environment ,3 People can communicate with each other , Don't have to consider DR and BDR Vote disagree , You can choose broadcast

R1

[r1-Tunnel0/0/0]int t0/0/1
[r1-Tunnel0/0/1]ospf network-type broadcast

R4/5 ditto