[hcip] experiment of republishing and routing strategy

The experimental requirements

1. Use two-point two-way republishing
2. All routers choose the best route
3. There is a backup path , No loop and route feedback
4. R1 Except for self loopback , Plus several loops
   172.16.1.0/24 deny
   172.16.2.0/24 type 1
   172.16.3.0/24 cost 6
   172.16.4.0/24 type 1 cost 9
   Change the above parameters
   

Experimental process

To configure IP

//R1 -  example 
# 
interface GigabitEthernet0/0/0            
 ip address 12.1.1.1 255.255.255.0        
# 
interface GigabitEthernet0/0/1            
 ip address 14.1.1.1 255.255.255.0                           
# 
interface LoopBack0                       
 ip address 1.1.1.1 255.255.255.0         
# 
interface LoopBack1                       
 ip address 172.16.1.1 255.255.255.0      
# 
interface LoopBack2                       
 ip address 172.16.2.1 255.255.255.0      
# 
interface LoopBack3                       
 ip address 172.16.3.1 255.255.255.0      
# 
interface LoopBack4                       
 ip address 172.16.4.1 255.255.255.0

START agreement

//RIP
//R1
rip 1                                     
 undo summary                             
 version 2                                
 network 1.0.0.0                          
 network 172.16.0.0                       
 network 12.0.0.0                         
 network 14.0.0.0                         
//R2
rip 1                                     
 undo summary                             
 version 2                                
 network 2.0.0.0                          
 network 12.0.0.0
//R4
rip 1                                     
 undo summary                             
 version 2                                
 network 14.0.0.0

//OSPF
//R2
ospf 1 router-id 2.2.2.2                  
 area 0.0.0.0                             
  network 23.1.1.2 0.0.0.0
//R3
ospf 1 router-id 3.3.3.3                  
 area 0.0.0.0                             
  network 3.3.3.3 0.0.0.0                 
  network 23.1.1.3 0.0.0.0                
  network 34.1.1.3 0.0.0.0                
//R4
ospf 1 router-id 4.4.4.4                  
 area 0.0.0.0                             
  network 4.4.4.4 0.0.0.0                 
  network 34.1.1.4 0.0.0.0

Route table display

Two way republication

//R2
ospf 1 router-id 2.2.2.2                  
 import-route rip 1                       
 area 0.0.0.0                             
  network 23.1.1.2 0.0.0.0                
# 
rip 1                                     
 undo summary                             
 version 2                                
 network 2.0.0.0                          
 network 12.0.0.0                         
 import-route ospf 1
//R4
ospf 1 router-id 4.4.4.4                  
 import-route rip 1                       
 area 0.0.0.0                             
  network 4.4.4.4 0.0.0.0                 
  network 34.1.1.4 0.0.0.0                
# 
rip 1                                     
 undo summary                             
 version 2                                
 network 14.0.0.0                         
 import-route ospf 1 

Route table display


You can find R4 The routing table of is consistent with that before republishing , Therefore, there is no routing feedback
however R2 The routing table of is inconsistent with that before republishing ,R4 Loopback 4.4.4.4 stay OSPF And RIP Different sending methods lead to routing feedback , stay R2 Two routes are generated in the route table

// Solution ： modify R4 Looped OSPF Operation mode 
[R4]interface LoopBack 0
[R4-LoopBack0]ospf network-type broadcast

Check again at this time R2 Routing table , nothing 4.4.4.4/32

You can also change the address to 4.4.4.4/32, There will be no 4.4.4.4/24 Address

Connectivity testing ：R1 Loopback ping R3 Loopback

Interference in routing

R1 Yes OSPF and R3 Yes RIP Any network segment in is equal overhead load balancing

But in fact, there are differences between the upper and lower roads , We are in R2 And R4 The upper interference chooses the way — Use Offset list

//R2
[R2]ip ip-prefix a permit 4.4.4.0 24
[R2]ip ip-prefix a permit 34.1.1.0 24
[R2]interface g0/0/0
[R2-GigabitEthernet0/0/0]rip metricout ip-prefix a 2
//R4
[R4]ip ip-prefix a permit 23.1.1.0 24
[R4]int g0/0/1
[R4-GigabitEthernet0/0/1]rip metricout ip-prefix a 2

here R1 To R3 The route selection of has been completed , The next in OSPF Medium interference routing , Use Huawei routing strategy

// The type of poor routing 2 Change to type 1
//R2
[R2]ip ip-prefix b permit 2.2.2.0 24
[R2]ip ip-prefix b permit 12.1.1.0 24
[R2]route-policy b permit node 10
Info: New Sequence of this List.
[R2-route-policy]if-match ip-prefix b
[R2-route-policy]apply cost-type type-1
[R2-route-policy]q
[R2]route-policy b permit node 20	// Empty table , Allow all 
Info: New Sequence of this List.
[R2-route-policy]q
[R2]ospf 1
[R2-ospf-1]import-route rip route-policy b	// Reissue 
//R4
[R4]ip ip-prefix b permit 14.1.1.0 24
[R4]route-policy b permit node 10
Info: New Sequence of this List.
[R4-route-policy]if-match ip-prefix b
[R4-route-policy]apply cost-type type-1
[R4-route-policy]q
[R4]route-policy b permit node 20
Info: New Sequence of this List.
[R4-route-policy]q
[R4]ospf 1
[R4-ospf-1]import-route rip route-policy b

At this time only R1 Loop back and other overhead load balancing

change R1 Loopback parameters – Huawei routing strategy

//R2
ip ip-prefix R1-1 index 10 permit 172.16.1.0 24
ip ip-prefix R1-2 index 10 permit 172.16.2.0 24
ip ip-prefix R1-3 index 10 permit 172.16.3.0 24
ip ip-prefix R1-4 index 10 permit 172.16.4.0 24
#
route-policy b permit node 10             
 if-match ip-prefix b                     
 apply cost-type type-1                   
# 
route-policy b deny node 20               
 if-match ip-prefix R1-1                  
# 
route-policy b permit node 30             
 if-match ip-prefix R1-2                  
 apply cost-type type-1                   
# 
route-policy b permit node 40             
 if-match ip-prefix R1-3                  
 apply cost 6                             
# 
route-policy b permit node 50             
 if-match ip-prefix R1-4                  
 apply cost 6                             
 apply cost-type type-1                   
# 
route-policy b permit node 60
# 
ospf 1 router-id 2.2.2.2                  
 import-route rip 1 route-policy b
//R4 -  ditto 

Route table display


Connectivity test ：