BGP团体属性应用

R1：

bgp 100
 peer 10.1.12.2 as-number 100 
 peer 10.1.13.3 as-number 200 
 #
 ipv4-family unicast
  undo synchronization
  network 1.1.1.1 255.255.255.255 route-policy comm 
  peer 10.1.12.2 enable
  peer 10.1.12.2 next-hop-local 
  peer 10.1.13.3 enable
  peer 10.1.13.3 advertise-community

route-policy comm permit node 1 
 apply community 100:1 
R2：

bgp 100
 peer 10.1.12.1 as-number 100 
 peer 10.1.24.2 as-number 300 
 #
 ipv4-family unicast
  undo synchronization
  peer 10.1.12.1 enable
  peer 10.1.12.1 next-hop-local 
  peer 10.1.24.2 enable
  peer 10.1.24.2 route-policy comm export
  peer 10.1.24.2 advertise-community

route-policy comm permit node 10 
 apply community 100:2

R3：

bgp 200
 peer 10.1.13.1 as-number 100 
 peer 10.1.34.2 as-number 300 
 #
 ipv4-family unicast
  undo synchronization
  peer 10.1.13.1 enable
  peer 10.1.34.2 enable
  peer 10.1.34.2 advertise-community

R4

bgp 300
 peer 10.1.24.1 as-number 100 
 peer 10.1.34.1 as-number 200 
 #
 ipv4-family unicast
  undo synchronization
  peer 10.1.24.1 enable
  peer 10.1.24.1 route-policy comm import
  peer 10.1.34.1 enable
  peer 10.1.34.1 route-policy comm import
#
route-policy comm permit node 10 
 if-match community-filter 1 
 apply local-preference 200 
#
route-policy comm permit node 20 
 if-match community-filter 2 
 apply local-preference 50 
#
ip community-filter 1 permit 100:1
ip community-filter 2 permit 100:2