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1、 操纵操纵 BGPBGP AS-PATHAS-PATH 属性案例属性案例BGP 总是优先选择具有最短 AS 路径的路由。本案例中，我们将配置 R1，将 1.0.0.0 通告给 R2、R3 之前预先添加两个额外的 AS 路径到 1.0.0.0 上 （AS300、AS400）具体配置如下： / r1 / int f2/0ip ad 192.1.1.1 255.255.255.0int f3/0ip ad 193.1.1.1 255.255.255.0int lo0ip ad 1.1.1.1 255.255.255.0int lo1ip ad 2.2.2.2 255.255.255.0router
2、bgp 100no synneighbor 192.1.1.2 remote-as 200neighbor 193.1.1.3 remote-as 200network 1.0.0.0network 1.0.0.0neighbor 193.1.1.3 route-map aspath outaccess-list 1 permit 1.0.0.0 0.255.255.255route-map aspath 10match ip ad 1set as-path prepend 300 400 route-map aspath 20/ r2 / int f2/0ip ad 192.1.1.2 25
3、5.255.255.0int f4/0ip ad 194.1.1.2 255.255.255.0router os 1netw 0.0.0.0 255.255.255.255 a 0passive-interface f2/0router bgp 200no synneighbor 192.1.1.1 remote-as 100neighbor 194.1.1.4 remote-as 200neighbor 195.1.1.3 remote-as 200neighbor 194.1.1.4 next-hop-self/ r3 / int f3/0ip ad 193.1.1.3 255.255.
4、255.0int f5/0ip ad 195.1.1.3 255.255.255.0router os 1netw 0.0.0.0 255.255.255.255 a 0passive-interface f3/0router bgp 200no synneighbor 193.1.1.1 remote-as 100neighbor 195.1.1.4 remote-as 200neighbor 195.1.1.4 next-hop-selfneighbor 194.1.1.2 remote-as 200/ r4 / int f4/0ip ad 194.1.1.4 255.255.255.0i
5、nt f5/0ip ad 195.1.1.4 255.255.255.0int lo0ip ad 4.4.4.4 255.255.255.0router os 1netw 0.0.0.0 255.255.255.255 a 0router bgp 200no synneighbor 194.1.1.2 remote-as 200neighbor 195.1.1.3 remote-as 200netw 4.0.0.0验证：r3#sh ip bNetwork Next Hop Metric LocPrf Weight Path *i1.0.0.0 192.1.1.1 0 100 0 100 i *
6、 193.1.1.1 0 0 100 300 400 i * i2.0.0.0 192.1.1.1 0 100 0 100 i * 193.1.1.1 0 0 100 i *i4.0.0.0 195.1.1.4 0 100 0 ir3#sh ip ro B 1.0.0.0/8 200/0 via 192.1.1.1, 00:05:23 B 2.0.0.0/8 20/0 via 193.1.1.1, 00:05:234.0.0.0/8 is variably subnetted, 2 subnets, 2 masks O 4.4.4.4/32 110/65 via 195.1.1.4, 00:10:38, Serial5/0 B 4.0.0.0/8 200/0 via 195.1.1.4, 00:10:13C 193.1.1.0/24 is directly connected, Serial3/0 O 192.1.1.0/24 110/192 via 195.1.1.4, 00:10:38, Serial5/0 C 195.1.1.0/24 is directly connected, Serial5/0 O 194.1.1.0/24 110/128 via 195.1.1.4, 00:10:38, Serial5/0
