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1、操作BGP路由过滤（基于路由条目）案例路由能够基于网络号过滤到或来自于某个特定邻居的路由更新。由访问列表组成的过滤器被应用到所有发送到或来自于某个特定邻居的BGP更新上。本案例中，我们在R1上配置一个distribute-list，防止1.0.0.0/8被通告入AS200中。/ r1 /int f2/0 ip ad 192.1.1.1 255.255.255.0int f3/0 ip ad 193.1.1.1 255.255.255.0int lo0 ip ad 1.1.1.1 255.255.255.0int lo1 ip ad 2.2.2.2 255.255.255.0router bgp
2、 100 no syn neighbor 192.1.1.2 remote-as 200 neighbor 193.1.1.3 remote-as 200 network 1.0.0.0 network 1.0.0.0 neighbor 193.1.1.3 distribute-list 1 outaccess-list 1 deny 1.0.0.0 0.255.255.255access-list 1 permit any/ r2 /int f2/0 ip ad 192.1.1.2 255.255.255.0int f4/0 ip ad 194.1.1.2 255.255.255.0rout
3、er os 1 netw 0.0.0.0 255.255.255.255 a 0 passive-interface f2/0router bgp 200 no syn neighbor 192.1.1.1 remote-as 100 neighbor 194.1.1.4 remote-as 200 neighbor 195.1.1.3 remote-as 200 neighbor 194.1.1.4 next-hop-self/ r3 /int f3/0 ip ad 193.1.1.3 255.255.255.0int f5/0 ip ad 195.1.1.3 255.255.255.0ro
4、uter os 1 netw 0.0.0.0 255.255.255.255 a 0 passive-interface f3/0router bgp 200 no syn neighbor 193.1.1.1 remote-as 100 neighbor 195.1.1.4 remote-as 200 neighbor 195.1.1.4 next-hop-self neighbor 194.1.1.2 remote-as 200/ r4 /int f4/0 ip ad 194.1.1.4 255.255.255.0int f5/0 ip ad 195.1.1.4 255.255.255.0
5、int lo0 ip ad 4.4.4.4 255.255.255.0router os 1 netw 0.0.0.0 255.255.255.255 a 0router bgp 200 no syn neighbor 194.1.1.2 remote-as 200 neighbor 195.1.1.3 remote-as 200 netw 4.0.0.0验证：r2#sh ip bgp Network Next Hop Metric LocPrf Weight Path* 1.0.0.0 192.1.1.1 0 0 100 i* i2.0.0.0 193.1.1.1 0 100 0 100 i* 192.1.1.1 0 0 100 i*i4.0.0.0 194.1.1.4 0 100 0 i由193.1.1.1学来的1.0.0.0/8路由条目已被过滤！
