49、BGP配置实验之联邦

1、联邦解析








联邦工作原理：在AS内部手动划分多个私有AS（联邦中的私有AS好不增加AS-PATH的路径长度）
配置步骤：
第一步：router bgp 小AS号（私有AS号）
第二步：声明所在大AS号
第三步：小AS号之间互指peer

2、实验拓扑




3、基础配置
R1配置
interface Loopback0 ip address 1.1.1.1 255.255.255.0interface Serial0/0 ip address 12.1.1.1 255.255.255.0router 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配置interface Loopback0 ip address 2.2.2.2 255.255.255.0interface Serial0/0 ip address 12.1.1.2 255.255.255.0interface Serial0/1 ip address 23.1.1.2 255.255.255.0router 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配置interface Loopback0 ip address 3.3.3.3 255.255.255.0interface Serial0/0 ip address 34.1.1.3 255.255.255.0interface Serial0/1 ip address 23.1.1.3 255.255.255.0router 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配置interface Loopback0 ip address 4.4.4.4 255.255.255.0interface Serial0/0 ip address 34.1.1.4 255.255.255.0router 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、配置邻邦解决水平分割R2配置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配置
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配置
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





本文出自 “开源殿堂” 博客，请务必保留此出处http://kaiyuandiantang.blog.51cto.com/10699754/1722529