HCIA experiment (06)

1. Address planning

192.168.1.0/24  （ Divided into two subnets ）

192.168.1.0/25     A0（ Area 0）

192.168.1.0/27   （ The backbone ）

192.168.1.0/29  192.168.1.8/29  192.168.1.16/29  192.168.1.24/29

192.168.1.32/27  R1  192.168.1.64/27  R2  192.168.1.94/27   R3 （ user ）

192.168.1.128/25   A1（ Area 1）

2. Configure loopback

[r1]int LoopBack 0
[r1-LoopBack0]ip add 192.168.1.33 27
[r2]int LoopBack 0
[r2-LoopBack0]ip add 192.168.1.65 27
[r3]int LoopBack 0
[r3-LoopBack0]ip add 192.168.1.97 27
[r4]int LoopBack 0
[r4-LoopBack0]ip add 4.4.4.4 24

3. Configure router interface

[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 192.168.1.1 29
[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ip add 192.168.1.2 29
[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ip add 192.168.1.3 29
[r3]int g0/0/1
[r3-GigabitEthernet0/0/1]ip add 192.168.1.129 25
[r4]int g0/0/0
[r4-GigabitEthernet0/0/0]ip add 192.168.1.130 25

（ test ）

4. Declare

[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
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]network 192.168.1.3 0.0.0.0
[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]network 192.168.1.97 0.0.0.0
[r3]ospf 1 router-id 4.4.4.4 
[r3-ospf-1]area 1
[r3-ospf-1-area-0.0.0.1]network 192.168.1.129 0.0.0.0
[r4]ospf 1 router-id 4.4.4.4 
[r4-ospf-1]area 1
[r4-ospf-1-area-0.0.0.1]network 192.168.1.130 0.0.0.0

（ see r3）

（r3 And r1,r2 and r4 All normal establishment becomes adjacency ） 

（ see r4）

5. Modify election results and priorities

[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ospf dr-priority 0
[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ospf dr-priority 0（ Abandon the election , Only form DR）

（ see r1 and r2）

 

（ When DR by 0, All form a neighborhood , No topology interaction , Cannot form a path ） 

6. stay r4 Configure default settings on

[r4]ospf 1
[r4-ospf-1]default-route-advertise always 

（ see r1 Of ospf）

（ Default implementation ）

（ test ）

8.（ To ensure the security of updates ） Do the authentication  

[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ospf authentication-mode md5 1 cipher 123456
[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ospf authentication-mode md5 1 cipher 123456
[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ospf authentication-mode md5 1 cipher 123456

9. Put the area 0 Routing summary for , Send to area 1

[r3]ospf 1
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]abr-summary 192.168.1.0 255.255.255.128

10. stay r3 Make an empty interface on , Prevent loops

[r3]ip route-static 192.168.1.0 25 NULL 0