MGRE and OSPF comprehensive experiment

One 、 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,R4,R5 by The whole company MGRE structure ,R1,R2,R3 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

Two 、 Experimental Topology

3、 ... and 、 The experimental steps

1. Divide network segments reasonably

R1 - R6 GE 0/0/0 The network segments divided between interfaces are ----- 16.0.0.0/24

R1 - R6 GE 0/0/1 The network segments divided between interfaces are ----- 61.0.0.0/24

R2 - R6 The network segment divided between is ----- 26.0.0.0/24

R3 - R6 The network segment divided between is ----- 36.0.0.0/24

R4 - R6 The network segment divided between is ----- 46.0.0.0/24

R5 - R6 The network segment divided between is ----- 56.0.0.1/24

R1 - R5 The private network segment of is divided into ：192.168.1.0/24;192.168.2.0/24;192.168.3.0/24;192.168.4.0/24;192.168.5.0/24

2. Configure network segment
   Configuration command ：
   int g（ Interface number ）+ip address +IP Address
   
   And so on

R1：

R2：

Follow up routers can be obtained in the same way
Complete the basic IP After the address , Remember to test its connectivity .

3. Manually write arrival isp The default route for
   command ：
   
   The same applies to other routers , Remember to test its connectivity after configuration .

4. To configure R1,R4,R5 Of MGRE structure
   Central site R1：
   

Central site R4：

Central site R5：

5. To configure R1,R2,R3 Of MGRE structure
   Central site R1：
   
   Branch R2：
   

Branch R3：

1. Turn on OSPF agreement
   R1 command ：
   
   And so on for other routers .

7. matters needing attention
1. because MGRE The tunnel interface formed by the structure is p2p Interface of type , therefore R1 Only with R4 or R5 One of the routers connects and establishes ospf Relationship , So we need to connect the three tunnel interfaces by p2p The interface of type is modified to Broadcast（ Ethernet type ） Let the central site R1 And R4 And R5 Can connect and establish ospf Relationship .

Other routers need to be operated .

2. The corresponding tunnel interface type of the three is modified to Broadcast after , There will be one BR And BDR The election of , The election rule is to compare the three router-id The size of is due to R1 Of router-id Than R2 R3 Small , And because of R2 And R3 The information is through the central site R1 For transmission R1 Only with R2 And R3 One of the routers DR And BDR The election of , Which leads to R1 Only with R2 or R3 One of the routers is set up ospf Relationship , Inform that the three cannot be established ospf Relationship .

resolvent ：R2,R3 Abandon the election

experimental result

use R1 To test other equipment

thus , This experiment is completed ！！！