首先，這次的目的是通過配置聯盟，AR3，AR4，AR5，AR6 都可以學習到192.168.1.1/24這個網段，但按照我的配置還沒有實現全網互通，只是練習配置聯盟，要實現全網互通可以配置通告網段實現全網互通，纔可以看到完整的bgp路由表
AR1
#
interface GigabitEthernet0/0/0
ip address 192.168.1.1 255.255.255.0
#
interface GigabitEthernet0/0/1
ip address 192.168.2.1 255.255.255.0
#
bgp 100
router-id 1.1.1.1
peer 192.168.2.2 as-number 500
#
ipv4-family unicast
undo synchronization
network 192.168.1.0
peer 192.168.2.2 enable
#
AR2
interface Ethernet0/0/0
ip address 192.168.3.1 255.255.255.0
#
interface Ethernet0/0/1
ip address 192.168.5.1 255.255.255.0
#
interface GigabitEthernet0/0/0
ip address 192.168.6.1 255.255.255.0
#
interface GigabitEthernet0/0/1
ip address 192.168.2.2 255.255.255.0
#
interface GigabitEthernet0/0/2
ip address 192.168.4.1 255.255.255.0
#
#
bgp 400
router-id 2.2.2.2
confederation id 500
confederation peer-as 200 300
peer 192.168.2.1 as-number 100
peer 192.168.3.2 as-number 200
peer 192.168.4.2 as-number 300
peer 192.168.5.2 as-number 400
peer 192.168.6.2 as-number 400
#
ipv4-family unicast
undo synchronization
peer 192.168.2.1 enable
peer 192.168.2.1 next-hop-local
peer 192.168.3.2 enable
peer 192.168.3.2 next-hop-local
peer 192.168.4.2 enable
peer 192.168.4.2 next-hop-local
peer 192.168.5.2 enable
peer 192.168.5.2 next-hop-local
peer 192.168.6.2 enable
peer 192.168.6.2 next-hop-local
#
ospf 1
area 0.0.0.0
network 192.168.5.0 0.0.0.255
network 192.168.6.0 0.0.0.255
#
AR3
#
interface GigabitEthernet0/0/0
ip address 192.168.6.2 255.255.255.0
#
interface Ethernet0/0/1
ip address 192.168.7.2 255.255.255.0
#
#
bgp 400
router-id 3.3.3.3
confederation id 500
peer 192.168.6.1 as-number 400
peer 192.168.7.1 as-number 400
#
ipv4-family unicast
undo synchronization
peer 192.168.6.1 enable
peer 192.168.7.1 enable
#
ospf 1
area 0.0.0.0
network 192.168.6.0 0.0.0.255
network 192.168.7.0 0.0.0.255
#
AR4
#
interface Ethernet0/0/0
ip address 192.168.7.1 255.255.255.0
#
interface Ethernet0/0/1
ip address 192.168.5.2 255.255.255.0
#
#
bgp 400
router-id 4.4.4.4
confederation id 500
peer 192.168.5.1 as-number 400
peer 192.168.7.2 as-number 400
#
ipv4-family unicast
undo synchronization
peer 192.168.5.1 enable
peer 192.168.7.2 enable
#
ospf 1
area 0.0.0.0
network 192.168.5.0 0.0.0.255
network 192.168.7.0 0.0.0.255
#
AR5
interface Ethernet0/0/0
ip address 192.168.3.2 255.255.255.0
#
bgp 200
confederation id 500
confederation peer-as 300 400
peer 192.168.3.1 as-number 400
#
ipv4-family unicast
undo synchronization
network 192.168.3.0
peer 192.168.3.1 enable
#
AR6
#
interface GigabitEthernet0/0/2
ip address 192.168.4.2 255.255.255.0
#
bgp 300
confederation id 500
confederation peer-as 200 400
peer 192.168.4.1 as-number 400
#
ipv4-family unicast
undo synchronization
network 192.168.4.0
peer 192.168.4.1 enable
#
查看路由表發現都學到了192.168.1.1/24這個網段，例如我在AR4查看bgp路由表
同樣
在AR5查看BGP路由表
都存在192.168.1.0 這個網段。