49. Federation of BGP configuration experiments
1. Federal resolution
How federation works: divide multiple private AS manually within AS (private AS in federation does not increase the path length of AS-PATH)
Configuration steps:
Step 1: router bgp small AS number (private AS number)
Step 2: declare the big AS account
Step 3: refer to each other's peer between small AS numbers
2. Experimental topology
3. Basic configuration
R1 configuration
Interface Loopback0
Ip address 1.1.1.1 255.255.255.0
Interface Serial0/0
Ip address 12.1.1.1 255.255.255.0
Router bgp 1
No synchronization
Bgp router-id 1.1.1.1
Network 1.1.1.0 mask 255.255.255.0
Neighbor 12.1.1.2 remote-as 2
No auto-summary
R2 configuration
Interface Loopback0
Ip address 2.2.2.2 255.255.255.0
Interface Serial0/0
Ip address 12.1.1.2 255.255.255.0
Interface Serial0/1
Ip address 23.1.1.2 255.255.255.0
Router ospf 110
Router-id 2.2.2.2
Network 2.2.2.0 0.0.0.255 area 0
Network 23.1.1.0 0.0.0.255 area 0
R3 configuration
Interface Loopback0
Ip address 3.3.3.3 255.255.255.0
Interface Serial0/0
Ip address 34.1.1.3 255.255.255.0
Interface Serial0/1
Ip address 23.1.1.3 255.255.255.0
Router ospf 110
Router-id 3.3.3.3
Network 3.3.3.0 0.0.0.255 area 0
Network 23.1.1.0 0.0.0.255 area 0
Network 34.1.1.0 0.0.0.255 area 0
R4 configuration
Interface Loopback0
Ip address 4.4.4.4 255.255.255.0
Interface Serial0/0
Ip address 34.1.1.4 255.255.255.0
Router ospf 110
Router-id 4.4.4.4
Network 4.4.4.0 0.0.0.255 area 0
Network 34.1.1.0 0.0.0.255 area 0
4. Configure neighbors to solve horizontal division.
R2 configuration
Router bgp 64512
No synchronization
Bgp router-id 2.2.2.2
Bgp confederation identifier 2
Neighbor 3.3.3.3 remote-as 64512
Neighbor 3.3.3.3 update-source Loopback0
Neighbor 3.3.3.3 next-hop-self
Neighbor 12.1.1.1 remote-as 1
No auto-summary
R3 configuration
Router bgp 64512
No synchronization
Bgp router-id 3.3.3.3
Bgp confederation identifier 2
Bgp confederation peers 64513
Neighbor 2.2.2.2 remote-as 64512
Neighbor 2.2.2.2 update-source Loopback0
Neighbor 4.4.4.4 remote-as 64513
Neighbor 4.4.4.4 ebgp-multihop 255
Neighbor 4.4.4.4 update-source Loopback0
No auto-summary
R4 configuration
Router bgp 64513
No synchronization
Bgp router-id 4.4.4.4
Bgp confederation identifier 2
Bgp confederation peers 64512
Neighbor 3.3.3.3 remote-as 64512
Neighbor 3.3.3.3 ebgp-multihop 255
Neighbor 3.3.3.3 update-source Loopback0
No auto-summary
