OSPF includes special area experiments, mGRE construction and re release

The experimental requirements

1.IP Division of address

172.168.0.0/16 Divide 6 Net segment   borrow 3 position

Area 1

172.16.32.0/19 Divide 4 Subnet

172.16.32.0/21  172.16.40.0/21  172.16.48.0/21  172.16.56.0/21

Area 0

172.16.0.0/19 Used as a MGRE Network segment

Area 2

172.16.64.0/19 Divide 4 Subnet

172.16.64.0/21  172.16.72.0/21  172.16.80.0/21  

spare   172.16.88.0/21

Area 3

172.16.96.0/19 Divide 4 Subnet

172.16.96.0/21  172.16.104.0/21  172.16.112.0/21

spare  172.168.120.0/21

Area 4

172.16.128.0/19 Divide 4 Subnet

172.16.128.0/21  172.16.136.0/21  172.16.144.0/21   

spare   172.16.152.0/21

RIP

172.16.160.0/19 Divide 2 Subnet

172.16.160.0/20   172.168.176.0/20

2. Topology construction

3.IP Address configuration

With R1、R2、R3、R4 give an example

R1：

interface GigabitEthernet0/0/0            
ip address 172.16.32.1 255.255.248.0                                  
interface LoopBack0                       
ip address 172.16.40.1 255.255.248.0 

R2：

interface GigabitEthernet0/0/0            
ip address 172.16.32.2 255.255.248.0                                      
interface LoopBack0                       
ip address 172.16.48.1 255.255.248.0

R3：

interface Serial3/0/0                                     
ip address 11.1.1.1 255.255.255.0                             
interface GigabitEthernet0/0/0            
ip address 172.16.32.3 255.255.248.0                                  
interface LoopBack0                       
ip address 172.16.56.1 255.255.248.0

R4：

interface Serial3/0/0                                        
ip address 11.1.1.2 255.255.255.0                                                
interface Serial3/0/1                                           
ip address 12.1.1.2 255.255.255.0                                                
interface Serial4/0/0                                            
ip address 13.1.1.2 255.255.255.0        
interface Serial4/0/1                                            
ip address 14.1.1.2 255.255.255.0                                      
interface LoopBack0                       
ip address 1.1.1.1 255.255.255.0 

4. Default route +NAT Configuration of

R3,R5,R6,R7 Add default routes and NAT

With R3 For example    ip route-static 0.0.0.0 0.0.0.0 11.1.1.2

  add to nat

acl 2000  
rule 1 permit any

interface Serial3/0/0
nat outbound 2000

5.R3—R5/6/7 by MGRE Environmental Science ,R3 For the central site

R3：

interface Tunnel0/0/0                     
ip address 172.16.0.1 255.255.255.128    
tunnel-protocol gre p2mp                 
source 11.1.1.1                          
ospf network-type broadcast              
nhrp entry multicast dynamic             
nhrp network-id 100

R5：

 interface Tunnel0/0/0                     
 ip address 172.16.0.2 255.255.255.128    
 tunnel-protocol gre p2mp                 
 source Serial4/0/0                       
 ospf network-type broadcast              
 ospf dr-priority 0                       
 nhrp network-id 100                      
 nhrp entry 172.16.0.1 11.1.1.1 register

 R6：

 interface Tunnel0/0/0                     
 ip address 172.16.0.3 255.255.255.128    
 tunnel-protocol gre p2mp                 
 source Serial4/0/0                       
 ospf network-type broadcast              
 ospf dr-priority 0                       
 nhrp network-id 100                      
 nhrp entry 172.16.0.1 11.1.1.1 register

 R7：

 interface Tunnel0/0/0                     
 ip address 172.16.0.4 255.255.255.128    
 tunnel-protocol gre p2mp                 
 source Serial4/0/0                       
 ospf network-type broadcast              
 ospf dr-priority 0                       
 nhrp network-id 100                      
 nhrp entry 172.16.0.1 11.1.1.1 register

6.OSPF agreement

By Region 1 For example

AR1：

ospf 1 router-id 1.1.1.1 
area 0.0.0.1 
network 172.16.0.0 0.0.255.255

AR2：

ospf 1 router-id 2.2.2.2 
area 0.0.0.1 
network 172.16.0.0 0.0.255.255 

AR3：

ospf 1 router-id 3.3.3.3 
 area 0.0.0.0 
  network 172.16.0.1 0.0.0.0 
 area 0.0.0.1 
  abr-summary 172.16.32.0 255.255.224.0
  network 172.16.32.3 0.0.0.0 
  network 172.16.56.1 0.0.0.0

7. Reissue

stay R9 and R12 on

R9：

 establish ospf 2
ospf 2 
 area 0.0.0.4 
  network 172.16.128.1 0.0.0.0 
  network 172.16.136.1 0.0.0.0
 stay ospf 1 Repeat step in 
import-route ospf 2

R12：

 Start first rip
rip 1
 version 2
 network 172.16.0.0
 stay ospf 1 Medium retransmission step 
import-route rip 1

8. Inter domain routing summary 、 Extraterritorial routing summary

R3：abr-summary 172.16.32.0 255.255.224.0

R6：abr-summary 172.16.64.0 255.255.224.0

R7：abr-summary 172.16.96.0 255.255.224.0

R9：asbr-summary 172.16.128.0 255.255.224.0

R12：asbr-summary 172.16.160.0 255.255.224.0

9. Special area

Area 1 Is the terminal area

The terminal area — The area rejects 4/5 Of LSA Get into ; The backbone area is connected by this area ABR equipment , Send a message to the area 3 Class ;

Completely peripheral area , Further reject on the basis of the peripheral region 3 Class LSA; Keep only one 3 Class ;

First, configure this area as a terminal area , And then only in ABR Just define the complete end on the ;

Area 2,3,4 by nssa Area

At the same time ASBR

Completely NSSA – Complete and incomplete peripheral regions ; In general NSSA On the basis of , Step closer and refuse 3 Class LSA, from ABR Generate a 3 Class configures this area as normal by default NSSA, And then only in ABR Completely defined NSSA that will do

 10. Air interface anti loop routing

  stay R3,R6,R7,R9,R12 Set up

With R3 For example

test - The whole network can reach

 R1ping The private network   R1pingR12 The loopback of