51-高级路由：BGP community属性：local-as

一、实验拓扑：

二、实验要求：
1、R4、R1、R3、R2分别在BGP进程下部署邻居发送团体属性命令；
2、R4上部署ACL抓取4.4.4.4流量、route-map命名as、调用ACL、set community local-as；并在BGP进程中调用route-map as out；
3、验证：R1、R3有4.4.4.4，但是R2没有4.4.4.0的路由条目?

三、命令部署：
R4(config)#route-map as permit 10
R4(config-route-map)#match ip address 10
R4(config-route-map)#set community local-as
R4(config-route-map)##route-map as permit 1000

R4(config)#router bgp 4
R4(config-router)#neighbor 14.1.1.1 route-map as out

四、验证：
R1#show ip bgp 4.4.4.4
BGP routing table entry for 4.4.4.0/24, version 4
Paths: (1 available, best #1, table Default-IP-Routing-Table, not advertised outside local AS)
Flag: 0x8A0
Advertised to update-groups:
2
4
14.1.1.4 from 14.1.1.4 (4.4.4.4)
Origin IGP, metric 0, localpref 100, valid, external, best
Community: local-AS

R3#show ip bgp 4.4.4.4
BGP routing table entry for 4.4.4.0/24, version 4
Paths: (1 available, best #1, table Default-IP-Routing-Table, not advertised outside local AS)
Flag: 0x8A0
Not advertised to any peer
4
1.1.1.1 (metric 156160) from 1.1.1.1 (1.1.1.1)
Origin IGP, metric 0, localpref 100, valid, confed-internal, best
Community: local-AS

R2#show ip bgp 4.4.4.4
% Network not in table

原文地址：http://blog.51cto.com/13856092/2138194