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Hcip --- BGP comprehensive experiment

2022-07-23 08:05:00 【Cyg engaged in it】

requirement ：

1, AS1 There are two loops , One address is 192.168.1.0/24 This address cannot be declared in any agreement , AS3 There are two loops , One address is 192.168.2.0/24 This address cannot be declared in any agreement , Finally, it is required that the two loops can communicate with each other ,
AS1 The other loopback of is 10.0.0.0/24, AS3 The other loopback of is 11.0.0.0/24.
2, Whole AS2 Of IP The address is 172.16.0.0/16, Please divide reasonably
3,AS Backbone link between IP The address can be customized at will
4, Use BGP The protocol allows the loopback of all devices in the whole network to access each other
5, Reduce the number of routing entries , Avoid loop problems

One 、 According to the requirements , To the whole AS2 Of IP Address for subnet Division

take 172.16.0.0/16 The network segment is divided into 172.16.0.0/24 Multiple network segments , Because in the actual project ,24 The network segment is more in line with the user network segment , Therefore, the network segment is divided into 172.16.0.0 /24 The subnet mask of is 24 The network segment , then 172.16.0.0/24 Multiple network segments are divided , take 172.16.0.0/24 The network segment of is used for P2P In the Internet , take 172.16.1.0/24 The network segment of is used for MA In the Internet , The loopback interface of each router uses a subnet mask of 24 The network segment .

172.16.0.0/16
172.16.0.0/24 ---P2P The Internet
172.16.1.0/24 ---MA The Internet
172.16.1.0/29
172.16.1.8/29
172.16.1.16/29
172.16.1.24/29
172.16.1.32/29
172.16.1.40/29
172.16.2.0/24 ---R2 Loopback
172.16.3.0/24 ---R3 Loopback
172.16.4.0/24 ---R4 Loopback
172.16.5.0/24 ---R5 Loopback
172.16.6.0/24 ---R6 Loopback
172.16.7.0/24 ---R7 Loopback

Two 、 Configure all routers IP Address

R1

[r1]int g 0/0/0
[r1-GigabitEthernet0/0/0]ip a 12.0.0.1 24
[r1-GigabitEthernet0/0/0]int lo0
[r1-LoopBack0]ip a 192.168.1.1 24
[r1-LoopBack0]int lo1
[r1-LoopBack1]ip a 10.0.0.1 24

R2

[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ip a 12.0.0.2 24
[r2-GigabitEthernet0/0/0]int lo0
[r2-LoopBack0]ip a 172.16.2.1 24
[r2]int g 0/0/1
[r2-GigabitEthernet0/0/1]ip a 172.16.1.1 29
[r2-GigabitEthernet0/0/1]int g0/0/2
[r2-GigabitEthernet0/0/2]ip a 172.16.1.9 29

R3

[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ip a 172.16.1.2 29
[r3-GigabitEthernet0/0/0]int lo0
[r3-LoopBack0]ip a 172.16.3.1 24
[r3-LoopBack0]int g 0/0/1
[r3-GigabitEthernet0/0/1]ip a 172.16.1.17 29

R4

[r4]int g0/0/0
[r4-GigabitEthernet0/0/0]ip a 172.16.1.18 29
[r4-GigabitEthernet0/0/0]int g 0/0/1
[r4-GigabitEthernet0/0/1]ip a 172.16.1.25 29
[r4-GigabitEthernet0/0/1]int lo0
[r4-LoopBack0]ip a 172.16.4.1 24

R5

[r5]int g 0/0/0
[r5-GigabitEthernet0/0/0]ip a 172.16.1.10 29
[r5-GigabitEthernet0/0/0]int g 0/0/1
[r5-GigabitEthernet0/0/1]ip a 172.16.1.133 29
[r5-GigabitEthernet0/0/1]int lo0
[r5-LoopBack0]ip a 172.16.5.1 24

R6

[r6]int g 0/0/0
[r6-GigabitEthernet0/0/0]ip a 172.16.1.34 29
[r6-GigabitEthernet0/0/0]int lo0
[r6-LoopBack0]ip a 172.16.6.1 24
[r6-LoopBack0]int g0/0/1
[r6-GigabitEthernet0/0/1]ip a 172.16.1.41 29

R7

[r7]int g0/0/0
[r7-GigabitEthernet0/0/0]ip a 172.16.1.42 29
[r7-GigabitEthernet0/0/0]int lo0
[r7-LoopBack0]ip a 172.16.7.1 24
[r7-LoopBack0]int g 0/0/1
[r7-GigabitEthernet0/0/1]ip a 172.16.1.26 29
[r7-GigabitEthernet0/0/1]int g 0/0/2
[r7-GigabitEthernet0/0/2]ip a 78.0.0.1 24

R8

[r8]int g 0/0/0
[r8-GigabitEthernet0/0/0]ip a 78.0.0.2 24
[r8-GigabitEthernet0/0/0]int lo0
[r8-LoopBack0]ip a 192.168.2.1 24
[r8-LoopBack0]int lo1
[r8-LoopBack1]ip a 11.0.0.1 24

R1:

R2: R3:

R4;

R5:

R6;

R7:R8:

3、 ... and 、 stay AS 2 Enable ospf agreement

R2 

[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]a 0
[r2-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

R3

[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]a 0
[r3-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

R4

[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]a 0
[r4-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

R5

[r5]ospf 1 router-id 5.5.5.5
[r5-ospf-1]a 0
[r5-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

R6

[r6]ospf 1 router-id 6.6.6.6
[r6-ospf-1]a 0
[r6-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

R7

[r7]ospf 1 router-id 7.7.7.7
[r7-ospf-1]a 0
[r7-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

Four 、 Enable... For all devices BGP agreement , And establish peers

R1

[r1]bgp 1 
[r1-bgp]route-select
[r1-bgp]router-id 1.1.1.1  
[r1-bgp]peer 12.0.0.2 as 2

R2

[r2]bgp 64512  
[r2-bgp]route-select
[r2-bgp]router-id 2.2.2.2  
[r2-bgp]confederation id 2   
[r2-bgp]confederation peer-as 64513
[r2-bgp]peer 12.0.0.1 as 1  
[r2-bgp]peer 172.16.3.1 as 64512   
[r2-bgp]peer 172.16.3.1 connect-interface LoopBack 0   
[r2-bgp]peer 172.16.5.1 as 64513  
[r2-bgp]peer 172.16.5.1 connect-interface LoopBack 0
[r2-bgp]peer 172.16.5.1 ebgp-max-hop 2  
[r2-bgp]peer 172.16.3.1 next-hop-local
[r2-bgp]peer 172.16.5.1 next-hop-local

R3

[r3]bgp 64512
[r3-bgp]router-id 3.3.3.3 
[r3-bgp]confederation id 2
[r3-bgp]peer 172.16.2.1 as 64512  
[r3-bgp]peer 172.16.2.1 connect-interface LoopBack 0 
[r3-bgp]peer 172.16.4.1 as 64512 
[r3-bgp]peer 172.16.4.1 connect-interface LoopBack 0

R4

[r4]bgp 64512
[r4-bgp]router-id 4.4.4.4 
[r4-bgp]confederation id 2
[r4-bgp]confederation peer-as 64513
[r4-bgp]peer 172.16.3.1 as 64512
[r4-bgp]peer 172.16.3.1 connect-interface LoopBack 0
[r4-bgp]peer 172.16.7.1 as 64513
[r4-bgp]peer 172.16.7.1 connect-interface LoopBack 0
[r4-bgp]peer 172.16.7.1 ebgp-max-hop 2

R5

[r5]bgp 64513
[r5-bgp]router-id 5.5.5.5  
[r5-bgp]confederation id 2
[r5-bgp]confederation peer-as 64512
[r5-bgp]peer 172.16.2.1 as 64512
[r5-bgp]peer 172.16.2.1 connect-interface LoopBack 0
[r5-bgp]peer 172.16.2.1 ebgp-max-hop 2
[r5-bgp]peer 172.16.6.1 as 64513
[r5-bgp]peer 172.16.6.1 connect-interface LoopBack 0

R6

[r6]bgp 64513
[r6-bgp]router-id 6.6.6.6   
[r6-bgp]confederation id 2
[r6-bgp]peer 172.16.5.1 as 64513  
[r6-bgp]peer 172.16.5.1 connect-interface LoopBack 0
[r6-bgp]peer 172.16.7.1 as 64513
[r6-bgp]peer 172.16.7.1 connect-interface LoopBack 0

R7

[r7]bgp 64513
[r7-bgp]router-id 7.7.7.7   
[r7-bgp]confederation id 2
[r7-bgp]confederation peer-as 64512 
[r7-bgp]peer 172.16.6.1 as 64513
[r7-bgp]peer 172.16.6.1 connect-interface LoopBack 0  
[r7-bgp]peer 172.16.4.1 as 64512 
[r7-bgp]peer 172.16.4.1 connect-interface LoopBack 0
[r7-bgp]peer 172.16.4.1 ebgp-max-hop 2
[r7-bgp]peer 78.0.0.2 as 3
[r7-bgp]peer 172.16.4.1 next-hop-local
[r7-bgp]peer 172.16.6.1 next-hop-local

R8

[r8]bgp 3   
[r8-bgp]router-id 8.8.8.8    
[r8-bgp]peer 78.0.0.1 as 2

5、 ... and 、 Publish routing information

Declare ：

[r1]bgp 1
[r1-bgp]ne	
[r1-bgp]network 10.0.0.0 24
[r1-bgp]
 
[r8]bgp 3
[r8-bgp]ne	
[r8-bgp]network 11.0.0.0 24

Modify the next jump ：

[r2-bgp]peer 172.16.3.1 next-hop-local
[r2-bgp]peer 172.16.5.1 next-hop-local
[r7-bgp]peer 172.16.4.1 next-hop-local
[r7-bgp]peer 172.16.6.1 next-hop-local

6、 ... and 、 Get rid of IBGP Horizontal segmentation between , Configure the routing reflector

R3

[r3]bgp 64512    
[r3-bgp]peer 172.16.2.1 reflect-client 

R6

[r6]bgp 64513
[r6-bgp]peer 172.16.7.1 reflect-client

7、 ... and 、 Short interface 、 Summarize and announce

R2

[r2]ip route-static 172.16.0.0 21 NULL 0   
[r2]bgp 64512 
[r2-bgp]network 172.16.0.0 21

R7

[r7]ip route-static 172.16.0.0 22 NULL 0 
[r7]bgp 64513
[r7-bgp]network 172.16.0.0 21

8、 ... and 、 establish GRE Tunnel , To realize the communication of two loops

R1

[r1]int t0/0/0
[r1-Tunnel0/0/0]ip a 192.168.10.1 24  
[r1-Tunnel0/0/0]tunnel-protocol gre  
[r1-Tunnel0/0/0]source 10.0.0.1
[r1-Tunnel0/0/0]destination 11.0.0.1  
[r1]ip route-static 192.168.1.0 24 99.0.0.2

R8

[r8]int t0/0/0
[r8-Tunnel0/0/0]ip a 192.168.10.2 24 
[r8-Tunnel0/0/0]tunnel-protocol gre  
[r8-Tunnel0/0/0]source 11.0.0.1
[r8-Tunnel0/0/0]destination 10.0.0.1
[r8]ip route-static 192.168.2.0 24 99.0.0.1