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<>实例最后保证两个在bgp里network发布的网段：ping -a 192.168.1.1 192.168.2.1 能通
<>配置思路：
1、首先配置基础的端口IP地址、回环接口地址、router-id 2、IBGP内部各相连接的物理接口先ospf打通。
3、EBGP间用直连接物理接口peer连接建立。 4、IBGP间用回环接口建立peer邻居，所有的回环地址必须在ospf里宣告，但不要宣告到bgp里去。 注意
：在IBGP建立邻居时peer ip地址 as 200 和peer ip地址 con loop 0 中的两个ip地址必须全为回环接口相同的地址，这个点容易错。
5、R2为边界路由要做：peer R3回环地址 next-hop-local ，不然R3收到的外部路由下一跳会指向R1的接口地址，造成R3不可达。
6、R3指定R4为RR-C 7、R4再指定R5为RR-C（如果不做这个R5的BGP宣告网段出不去） 8、R1的BGP里netwrol
宣告192.168.1.1，R5的BGP里network宣告192.168.2.1
R1:
interface GigabitEthernet0/0/0 ip address 12.1.1.1 255.255.255.0 # interface
LoopBack0 ip address 192.168.1.1 255.255.255.0 # bgp 100 router-id 1.1.1.1 peer
12.1.1.2 as-number 200 network 192.168.1.0 24
<>R2
interface GigabitEthernet0/0/0 ip address 12.1.1.2 255.255.255.0 # interface
GigabitEthernet0/0/1 ip address 23.1.1.1 255.255.255.0 ospf enable 1 area
0.0.0.0 interface LoopBack0 ip address 2.1.1.1 255.255.255.0 ospf enable 1 area
0.0.0.0 # bgp 200 router-id 2.2.2.2 peer 3.1.1.1 as-number 200 peer 3.1.1.1
connect-interface LoopBack0 peer 12.1.1.1 as-number 100 peer 3.1.1.1
next-hop-local ospf 1 area 0.0.0.0
<>R3
interface GigabitEthernet0/0/1 ip address 23.1.1.2 255.255.255.0 ospf enable 1
area 0.0.0.0 # interface GigabitEthernet0/0/2 ip address 34.1.1.1 255.255.255.0
ospf enable 1 area 0.0.0.0 # interface LoopBack0 ip address 3.1.1.1
255.255.255.0 ospf enable 1 area 0.0.0.0 # bgp 200 router-id 3.3.3.3 peer
2.1.1.1 as-number 200 peer 2.1.1.1 connect-interface LoopBack0 peer 4.1.1.1
as-number 200 peer 4.1.1.1 connect-interface LoopBack0 # peer 4.1.1.1
reflect-client # ospf 1 area 0.0.0.0
<>R4
interface GigabitEthernet0/0/0 ip address 45.1.1.1 255.255.255.0 ospf enable 1
area 0.0.0.0 # interface GigabitEthernet0/0/2 ip address 34.1.1.2 255.255.255.0
ospf enable 1 area 0.0.0.0 # interface LoopBack0 ip address 4.1.1.1
255.255.255.0 ospf enable 1 area 0.0.0.0 # bgp 200 router-id 4.4.4.4 peer
3.1.1.1 as-number 200 peer 3.1.1.1 connect-interface LoopBack0 peer 5.1.1.1
as-number 200 peer 5.1.1.1 connect-interface LoopBack0 peer 5.1.1.1
reflect-client # ospf 1 area 0.0.0.0
<>R5
interface GigabitEthernet0/0/0 ip address 45.1.1.2 255.255.255.0 ospf enable 1
area 0.0.0.0 # interface LoopBack0 ip address 5.1.1.1 255.255.255.0 ospf enable
1 area 0.0.0.0 # interface LoopBack1 ip address 192.168.2.1 255.255.255.0 # bgp
200 router-id 5.5.5.5 peer 4.1.1.1 as-number 200 peer 4.1.1.1 connect-interface
LoopBack0 network 192.168.2.0 24 # ospf 1 area 0.0.0.0