配置ip地址和换回口地址
1.在R1与R6上另外各加2个环回口
R1:
interface LoopBack1
ip address 192.168.200.1 255.255.255.255
R6：
interface LoopBack1
ip address 192.168.100.1 255.255.255.255
2.R2/R3/R4/R5/R6做ospf
以R2为例：
ospf 1
area 0.0.0.0
network 10.2.11.1 0.0.0.0
network 10.2.23.2 0.0.0.0
3.需要R1与R2建立ebgp邻居（用直连口建立）
R1:
bgp 100
router-id 10.2.11.1
peer 10.2.12.2 as-number 200
network 10.2.11.1 255.255.255.255 (宣告自己的loop back接口)
network 192.168.200.1 255.255.255.255(宣告自己的loop back接口)
R2:
bgp 65001
router-id 10.2.22.2
confederation id 200（配置联盟）
confederation peer-as 65002
peer 10.2.12.1 as-number 100
network 10.2.22.2 255.255.255.255
import-route ospf
4.R2<=>R3建立EBPGP邻居
R2:
bgp 65001
peer 10.2.23.3 as-number 65002
R3:
bgp 65002
router-id 10.2.33.3
confederation id 200
confederation peer-as 65001 65003
peer 10.2.23.2 as-number 65001
peer 10.2.35.5 as-number 65003
network 10.2.33.3 255.255.255.255
R3<=>R4建立Ibgp邻居
R3:
bgp 65002
peer 10.2.34.4 as-number 65002
R4:
bgp 65002
router-id 10.2.44.4
confederation id 200
peer 10.2.34.3 as-number 65002
R3<=>R5建立EBPGP邻居
R5:
bgp 65003
router-id 10.2.55.5
confederation id 200
confederation peer-as 65002
peer 10.2.35.3 as-number 65002
peer 10.2.56.6 as-number 65003
network 10.2.55.5 255.255.255.255
R5<=>R6建立Ibgp邻居
R6:
bgp 65003
router-id 10.2.66.6
confederation id 200
peer 10.2.56.5 as-number 65003
5.修改吓一跳
R2/R3/R5上都需要修改
R2:
bgp 65001
peer 10.2.12.1 next-hop-local
peer 10.2.23.3 next-hop-local
R3为例：
bgp 65002
peer 10.2.34.4 next-hop-local
peer 10.2.35.5 next-hop-local
R5:
bgp 65003
peer 10.2.56.6 next-hop-local
6.全网通
