Comprehensive experiment of ENSP on OSPF

The experimental requirements

1,R4 by ISP, Can only be configured on it IP Address ;R4 Shared with all other directly connected equipment IP.

2,R3 - R5/6/7 by MGRE Environmental Science ,R3 For the central site .

3, The whole network configuration OSPF Environmental Science ,IP be based on 172.16.0.0/16 Segment division .

4, All devices have a loopback interface ,R3 Loop back in area1 Announced in ,R6 R7 Loop back in area1 Announced in , All equipment Accessible R4 Loopback .

5, Reduce LSA Update quantity of , Speed up convergence , To ensure the security of updates .

6, Network wide accessibility .

Experimental environment

The experimental steps

1. Reasonably divide network segments
R3 - R4 The common network segment divided between is — 34.0.0.0/24

R4 - R5 The common network segment divided between is — 45.0.0.0/24

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

R4 - R7 The common network segment divided between is — 47.0.0.0/24

R4 The loopback network segment of is — 4.4.4.0/24

2. Division of private network segments
In this experiment , share 5 Areas and one RIP Area , Therefore, at least the network segment should be divided into Six main network segments

172.16.0.0/16
	172.16.0.0/19
	172.16.32.0/19
	172.16.64.0/19
	172.16.96.0/19
	172.16.128.0/19
	172.16.160.0/19
	172.16.192.0/19
	172.16.224.0/19

In these eight network segments , Just choose six as private network segments , Other network segments can be reserved for backup .
（1）Area 0 Zoning

172.16.0.0/24 ---  As P2P Network segment 

	172.16.0.0/30 

	172.16.0.4/30 

	172.16.0.8/30

	172.16.0.12/30 
	....

172.16.1.0/24 ---MA The backbone 
	172.16.1.0/29 ---MGRE Environmental Science 
	172.16.1.8/29
	172.16.1.16/29
	.....
	
172.16.2.0/24 --- R5 The loopback of 
172.16.3.0/24 --- R6 The loopback of 
172.16.4.0/24 --- R7 The loopback of 

Configure... On each router IP Address , In area 0 The router on the needs to manually configure one to ISP The default route for .

（2）Area 1 Zoning

172.16.32.0/19
	172.16.32.0/30 --- P2P The backbone of 

	172.16.32.4/30 

	172.16.32.8/30
	....

172.16.33.0/24 --- MA The backbone of 
	172.16.33.0/29
	172.16.33.8/29
	172.16.33.16/29
	....

172.16.34.0/24 --- R1 The loopback of 
172.16.35.0/24 --- R2 The loopback of 
172.16.36.0/24 --- R3 The loopback of 

（3）Area 2 Zoning

172.16.64.0/19
	172.16.64.0/30 --- P2P The backbone of 
	
172.16.65.0/24 --- MA The backbone of 
	172.16.65.0/29 
	...
	
172.16.66.0/24 --- R11 The loopback of 

172.16.160.0/19 ---RIP
	172.16.160.0/20
	172.16.176.0/20

（4）Area 3 Zoning

172.16.96.0/19
	172.16.96.0/30 --- P2P The backbone of 

172.16.97.0/24 --- MA The backbone of 
	172.16.97.0/29
	....

172.16.98.0/24 --- R8 The loopback of 
172.16.130.0/24 --- R9 The loopback of 
172.16.131.0/24 --- R10 The loopback of 

（5）Area 4 Zoning

172.16.128.0/19
	172.16.128.0/30 --- P2P The backbone of 
	....

172.16.129.0/24 --- MA The backbone of 
	172.16.129.0/29
	...

172.16.130.0/24 --- R9 The loopback of 
172.16.131.0/24 --- R10 The loopback of 

Specifically IP Address configuration

R1：

R2：

R3：

R4：

R5:

R6:

R7:

R8:

R9:

R10:

R11:

R12:

establish OSPF process

According to the area divided by the topic , Make the right announcement .
R1：

[r1]ospf 1 	
[r1]ospf 1 router-id 1.1.1.1
[r1-ospf-1]a 1
[r1-ospf-1-area-0.0.0.1]network 172.16.0.0 0.0.255.255

The rest of the routers , And so on .

The specific parameters are as follows ：
R1:

R2:

R3:

R5:

R6:

R7:

R8:

R9:

R10:

R11:

R12:

Turn on RIP

stay R12 Upper opening RIP process , And republish .

stay OSPF in ：

stay R9 Start dual processes on , convenient R10 Be able to obtain routing information .
In area 1 Delete inside ：

[r9-ospf-1-area-0.0.0.4]undo network 172.16.128.0 0.0.3.255

Create a process 2, And re announce ：

[r9]ospf 2 router-id 9.9.9.9
[r9-ospf-2]a 4
[r9-ospf-2-area-0.0.0.4]network 172.16.128.0 0.0.3.255

After starting the dual process , Need to be in OSPF 1 Make an announcement in .

[r9]ospf 1 
[r9-ospf-1]import-route ospf 2

Reduce LSA Routing information

1. Summary
First, summarize the inter domain routes ：（R3\R6\R7）
stay R3 Route summary on ：

[r3]ospf 
[r3-ospf-1]a 1
[r3-ospf-1-area-0.0.0.1]abr-summary 172.16.32.0 255.255.224.0

stay R6 Route summary on ：

[r6]ospf 
[r6-ospf-1]a 2
[r6-ospf-1-area-0.0.0.2]abr-summary 172.16.64.0 255.255.224.0

stay R7 Route summary on ：

[r7]ospf
[r7-ospf-1]a 3
[r7-ospf-1-area-0.0.0.3]abr-summary 172.16.96.0 255.255.224.0

Extraterritorial routing summary ：
R12 On ：

[r12]ospf
[r12-ospf-1]asbr-summary 172.16.160.0 255.255.224.0

R9 On ：

[r9]ospf	
[r9-ospf-1]asbr-summary 172.16.128.0 255.255.224.0

2. Special area
Common terminal area ：
stay R1 On ：

[r1]ospf 1
[r1-ospf-1]a 1
[r1-ospf-1-area-0.0.0.1]stub 

Router R2,R3 Same as above . but R3 Other operations need to be configured on ：

[r3-ospf-1-area-0.0.0.1]stub no-summary 

therefore , Area 1 It can become a complete terminal area .

stay R6 On ：

[r6]ospf
[r6-ospf-1]a 2
[r6-ospf-1-area-0.0.0.2]nssa no-summary

stay R11 On ：

[r11]ospf 
[r11-ospf-1]a 2
[r11-ospf-1-area-0.0.0.2]nssa

R12 Also operate as above .

stay R7 On ：

[r7]ospf 
[r7-ospf-1]a 3
[r7-ospf-1-area-0.0.0.3]nssa no-summary

R8 On ：

[r8]ospf
[r8-ospf-1]a 3
[r8-ospf-1-area-0.0.0.3]nssa 

R9 Same as above .

stay R9 The process of 2 Middle configuration ：

[r9]ospf 2
[r9-ospf-2]default-route-advertise

Configure empty interface

stay R3 On ：

[r3]ip route-static 172.16.32.0 255.255.224.0 NULL 0

As long as there is a summary router , All need to be configured .

visit R4 Loopback

[r3]acl 2000
[r3-acl-basic-2000]rule permit source 172.16.0.0 0.0.255.255
[r3]int s4/0/0
[r3-Serial4/0/0]nat outbound 2000

rest R5\R6\R7 The above configuration is required .

test

thus , This experiment is completed ！！！