BGP-Community:间接影响路由选路！
如下图：100的网络离开AS100时，携带属性离开！
AR1的配置：
bgp 100
peer 2.2.2.2 as-number 200
peer 2.2.2.2 ebgp-max-hop 255
peer 2.2.2.2 connect-interface LoopBack0
peer 3.3.3.3 as-number 200
peer 3.3.3.3 ebgp-max-hop 255
peer 3.3.3.3 connect-interface LoopBack0
group as200 internal
ipv4-family unicast undo synchronization network 100.1.1.0 255.255.255.0 network 100.1.2.0 255.255.255.0 peer 2.2.2.2 enable peer 2.2.2.2 route-policy 10 export peer 2.2.2.2 advertise-community peer 3.3.3.3 enable peer as200 enable
route-policy 10 permit node 10 if-match acl 2000 apply community 100:100
AR2的团体属性
由上实验从AS100携带100:100的属性进入AS 200，我艹，既然带了MM过来了，总地玩下这属性吧！
如上图100.0的网络，传递给AS300时给打上几个AS200！
AR2的配置
bgp 200
peer 4.4.4.4 advertise-community
peer 5.5.5.5 advertise-community
AR5的配置
bgp 200
peer 2.2.2.2 as-number 200 peer 2.2.2.2 connect-interface LoopBack0 peer 3.3.3.3 as-number 200 peer 3.3.3.3 connect-interface LoopBack0 peer 4.4.4.4 as-number 200 peer 4.4.4.4 connect-interface LoopBack0 peer 6.6.6.6 as-number 300 peer 6.6.6.6 ebgp-max-hop 255 peer 6.6.6.6 connect-interface LoopBack0
ipv4-family unicast undo synchronization peer 2.2.2.2 enable peer 2.2.2.2 next-hop-local peer 3.3.3.3 enable peer 3.3.3.3 next-hop-local peer 4.4.4.4 enable peer 4.4.4.4 next-hop-local peer 6.6.6.6 enable peer 6.6.6.6 route-policy 10 export
ospf 1 area 0.0.0.0 network 5.5.5.5 0.0.0.0 network 45.45.45.5 0.0.0.0
route-policy 10 permit node 10 if-match community-filter 10 apply as-path 200 200 200 200 200 additive
ip community-filter 10 permit 100:100
AR6应该携带6个AS200
AR6路由信息
