操纵bgp as-path 属性案例

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1、操纵BGP AS-PATH 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////intf2/0 ipad192.1.1.1255.255.255.0 intf3/0 ipad193.1.1.1255.255.255.0 intlo0 ipad1.1.1.1255.255.255.0 intlo1 ipad2.2.2.2255.255.255.0 routerbgp100 nosyn neighbor192

2、.1.1.2remote-as200 neighbor193.1.1.3remote-as200 network1.0.0.0 network1.0.0.0 neighbor193.1.1.3route-mapaspathout access-list1permit1.0.0.00.255.255.255 route-mapaspath10 matchipad1 setas-pathprepend300400route-mapaspath20   ////r2////intf2/0 ipad192.1.1.2255.255.255.0 intf4/0 ipad194.

3、1.1.2255.255.255.0 routeros1 netw0.0.0.0255.255.255.255a0 passive-interfacef2/0 routerbgp200 nosyn neighbor192.1.1.1remote-as100 neighbor194.1.1.4remote-as200 neighbor195.1.1.3remote-as200 neighbor194.1.1.4next-hop-self  ////r3////intf3/0 ipad193.1.1.3255.255.255.0 intf5/0 ipad195.1.1.3

4、255.255.255.0 routeros1 netw0.0.0.0255.255.255.255a0 passive-interfacef3/0 routerbgp200 nosyn neighbor193.1.1.1remote-as100 neighbor195.1.1.4remote-as200 neighbor195.1.1.4next-hop-self neighbor194.1.1.2remote-as200  ////r4////intf4/0 ipad194.1.1.4255.255.255.0 intf5/0 ipad195.1.1.4255.2

5、55.255.0 intlo0 ipad4.4.4.4255.255.255.0 routeros1 netw0.0.0.0255.255.255.255a0 routerbgp200 nosyn neighbor194.1.1.2remote-as200 neighbor195.1.1.3remote-as200 netw4.0.0.0   验证： r3#shipb  Network         NextHop           MetricLocPrfWeightPath*>i1.0.0.0         192.1.1.1               0

6、   100     0100i*                  193.1.1.1               0            0100300400i*i2.0.0.0         192.1.1.1               0   100     0100i*>                 193.1.1.1               0            0100i*>i4.0.0.0         195.1.1.4               0   100     0i  r3#shiproB   1.0.0.0/8[20

7、0/0]via192.1.1.1,00:05:23B   2.0.0.0/8[20/0]via193.1.1.1,00:05:23    4.0.0.0/8isvariablysubnetted,2subnets,2masksO      4.4.4.4/32[110/65]via195.1.1.4,00:10:38,Serial5/0B      4.0.0.0/8[200/0]via195.1.1.4,00:10:13C   193.1.1.0/24isdirectlyconnected,Serial3/0O   192.1.1.0/24[110