使用Route-Map过滤BGP的路由

实验目的

1、掌握使用Route-Map过滤BGP的路由。

实验拓扑

接口ip配置与bgp基础配置详见：

CSDNicon-default.png?t=N7T8https://mp.csdn.net/mp_blog/creation/editor/125210020查看R3的路由表：

R3#show ip route   

Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 4 subnets
B       1.1.0.0 [20/0] via 23.23.23.2, 00:00:01
B       1.1.1.0 [20/0] via 23.23.23.2, 00:00:01
B       1.1.2.0 [20/0] via 23.23.23.2, 00:04:53
B       1.1.3.0 [20/0] via 23.23.23.2, 00:04:53
     23.0.0.0/24 is subnetted, 1 subnets
C       23.23.23.0 is directly connected, FastEthernet0/1
     12.0.0.0/24 is subnetted, 1 subnets
B       12.12.12.0 [20/0] via 23.23.23.2, 00:04:53

在R2上配置Route-map路由过滤：

R2(config)#access-list 1 deny 1.1.0.0 0.0.0.255
R2(config)#access-list 1 deny 1.1.1.0 0.0.0.255
R2(config)#access-list 1 permit any 

R2(config)#route-map bgpfilter permit 10
R2(config-route-map)#match ip address 1
R2(config)#router bgp 12
R2(config-router)#neighbor 23.23.23.3 route-map bgpfilter out

查看R3的路由表，确认路由过滤的配置：

R3#show ip route   

Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 2 subnets
B       1.1.2.0 [20/0] via 23.23.23.2, 00:07:33
B       1.1.3.0 [20/0] via 23.23.23.2, 00:07:33
     23.0.0.0/24 is subnetted, 1 subnets
C       23.23.23.0 is directly connected, FastEthernet0/1
     12.0.0.0/24 is subnetted, 1 subnets
B       12.12.12.0 [20/0] via 23.23.23.2, 00:07:33