BGP confederation(컨페더레이션) 이론 및 실습

BGP confederation

컨페더레이션이란 AS내부에 사설 AS인 하위 AS를 생성해 하위 AS간에 eBGP 형식으로 연결하는 Fake eBGP로 하나의 공인 AS를 구성하여 라우팅 루프를 방지한다.

 

 

Topology

 

 

Command

//

Router(config-router​)​#bgp confederation identifier as-number // 공인 as

Router(config-router​)​#bgp confederation peers as-number​ // 상대방 as

//

 

Command​ (기본설정 제외)​

R6(config)#router bgp 65100

R6(config-router)#bgp confederation identifier 400 // 공인 as

R6(config-router)#bgp confederation peers 65200 // 상대방 as

R6(config-router)#neighbor 8.8.8.8 remote-as 65100

R6(config-router)#neighbor 8.8.8.8 update-source loopback 0

R6(config-router)#neighbor 8.8.8.8 next-hop-self

 

R7(config)#router bgp 65200

R7(config-router)#bgp confederation identifier 400

R7(config-router)#bgp confederation peers 65100

R7(config-router)#neighbor 9.9.9.9 remote-as 65200

R7(config-router)#neighbor 9.9.9.9 update-source loopback 0

R7(config-router)#neighbor 8.8.8.8 remote-as 65100

R7(config-router)#neighbor 8.8.8.8 update-source loopback 0

R7(config-router)#neighbor 8.8.8.8 ebgp-multihop 3

 

R8(config)#router bgp 65100

R8(config-router)#bgp confederation identifier 400

R8(config-router)#bgp confederation peers 65200

R8(config-router)#neighbor 6.6.6.6 remote-as 65100

R8(config-router)#neighbor 6.6.6.6 update-source loopback 0

R8(config-router)#neighbor 7.7.7.7 remote-as 65200

R8(config-router)#neighbor 7.7.7.7 update-source loopback 0

R8(config-router)#neighbor 7.7.7.7 ebgp-multihop 3

 

R9(config)#router bgp 65200

R9(config-router)#bgp confederation identifier 400

R9(config-router)#bgp confederation peers 65100

R9(config-router)#neighbor 7.7.7.7 remote-as 65200

R9(config-router)#neighbor 7.7.7.7 update-source loopback 0

R9(config-router)#neighbor 7.7.7.7 next-hop-self

 

 

Check