BGP federal experiment

One 、 The experimental requirements ：

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 in , 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 11.0.0.0/242,

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

Two 、 Experimental Topology ：

3、 ... and 、 Experimental configuration ：

（ One ）、 Segment division

（ Two ）、 Router basic ip To configure

（ 3、 ... and ）、 start-up OSPF process

（ Four ）、 start-up BGP

1.R1

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

2.R2:

And R1 Jianlin  
[r2]bgp 64512
[r2-bgp]router-id 2.2.2.2
[r2-bgp]confederation ip 2

[r2-bgp]confederation peer-as 64513          —— And R5 Establishing a federation EBGP Peer relationship

[r2-bgp]peer 12.0.0.1 as-number 1            ------- And R1 Build a neighborhood

And R3 Jianlin ：R2 And R3 yes  IBGP Loopback neighbor building between peer relationships  

[r2-bgp]peer 172.16.3.1 as-number 64512
[r2-bgp]peer 172.16.3.1 connect-interface LoopBack 0

And R5 Jianlin ：R2 And R5 Is a special Federation EBGP Jianlin

[r2-bgp]peer 172.16.5.1 as-number 64513
[r2-bgp]peer 172.16.5.1 connect-interface LoopBack 0
[r2-bgp]peer 172.16.5.1 ebgp-max-hop  ————EBGp Peers need to Non direct connection and neighbor building , Then To modify manually TTL value

3.R3

And R2 Jianlin

[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         

And R4 Build a neighbor

[r3-bgp]peer 172.16.4.1 as-number 64512
[r3-bgp]peer 172.16.4.1 connect-interface LoopBack 0

4.R4

[r4]bgp 64512  
[r4-bgp]router-id 4.4.4.4
[r4-bgp]confederation id 2  
[r4-bgp]confederation peer-as 64513          Establishing a federation EBGP Peer relationship

And R3 Jianlin

[r4-bgp]peer 172.16.3.1 as-number 64512

[r4-bgp]peer 172.16.3.1 connect-interface LoopBack 0

And R7 Build a neighbor

[r4-bgp]peer 172.16.7.1 as-number 64513   
[r4-bgp]peer 172.16.7.1 connect-interface LoopBack 0   
[r4-bgp]peer 172.16.7.1 ebgp-max-hop 

5.R5：

And R2 Jianlin
[r5]bgp 64513
[r5-bgp]router-id 5.5.5.5
[r5-bgp]confederation id 2
[r5-bgp]confederation peer-as 64512      Establishing a federation EBGP Peer relationship
[r5-bgp]peer 172.16.2.1 as-number 64512

[r5-bgp]peer 172.16.2.1 connect-interface LoopBack 0

[r5-bgp]peer 172.16.2.1 ebgp-max-hop

And R6 Build a neighbor
[r5-bgp]peer 172.16.6.1 as-number 64513
[r5-bgp]peer 172.16.6.1 connect-interface LoopBack 0

6.R6：

[r6]bgp 64513   
[r6-bgp]router-id 6.6.6.6
[r6-bgp]confederation id 2

And R5 Jianlin
[r6-bgp]peer 172.16.1.5 as-number 64513 
[r6-bgp]peer 172.16.1.5 connect-interface LoopBack 0

And R7 Jianlin

[r6-bgp]peer 172.16.7.1 as-number 64513
[r6-bgp]peer 172.16.7.1 connect-interface LoopBack 0

7.R7：

[r7]bgp 64513
[r7-bgp]router-id 7.7.7.7
[r7-bgp]confederation id 2
[r7-bgp]confederation peer-as 64512

And R4 Build a neighbor

[r7-bgp]peer 172.16.4.1 as    
[r7-bgp]peer 172.16.4.1 as-number 64512
[r7-bgp]peer 172.16.4.1 connect-interface LoopBack 0
[r7-bgp]peer 172.16.4.1 ebgp-max-hop

And R8 Build a neighbor

[r7-bgp]peer 78.0.0.2 as 3

8.R8：

[r7-bgp]peer 78.0.0.2 as 3

（ 5、 ... and ）、 Publish route

1. stay R1 Release 10.0.0.0 Network segment

[r1-bgp]network 10.0.0.0 24
[r2-bgp]display bgp routing-table 

here R2 Has been received R1 Published routing information , But at this time R3、R5 To receive R1 Routing information for , But it doesn't work

 2. resolvent ： modify R2 Change the attribute of the next hop to yourself

[r2]bgp 64512
[r2-bgp]peer 172.16.3.1 next-hop-local

[r2-bgp]peer 172.16.5.1 next-hop-local

At this point to see R3、R5 Become the best available

 3. Break the union R2 And R4,R3 And R7 Of IBGP Horizontal segmentation （IBGP Anti ring mechanism ： When a router from a IBGP Learn something from the peer BGP When routing , He will not be able to notify others in this route IBGP Peer relationship ）

 4. resolvent ： Set up a routing reflector between them

   （1） Set up R3：

[r3]bgp 64512
[r3-bgp]peer 172.16.2.1 reflect-client ———— Appoint R2 by R3 Reflective customers , here R3 by RR 了 .

      （2） Set up R6

[r6]bgp 64513
[r6-bgp]peer 172.16.5.1 reflect-client 

 5. here R2 And R6、R6 And R8 It's under the Federation EBGP Peer relationship , The router between them can forward routing information to R6 and R8.

 6. modify R7 Change the attribute of the next hop to yourself

[r7-bgp]peer 172.16.6.1 next-hop-local
[r7-bgp]peer 172.16.4.1 next-hop-local

At this time, the whole network can reach  

（ 5、 ... and ）、 stay R2 Make an empty interface to the summary