Shulou(Shulou.com)06/01 Report--

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

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