1、实验拓扑图
2、实验步骤
1、配置设备的ip地址
1、R1 sys sysname R1 [R1] int g0/0/0 [R1] ip add 10.0.12.1 24 [R1] undo shut [R1] int g0/0/1 [R1] ip add 10.0.13.1 24 [R1] int loop0 [R1] ip add 1.1.1.1 32 2、R2 sys sysname R2 [R2] int g0/0/0 [R2] ip add 10.0.12.2 24 [R2] int g0/0/1 [R2] ip add 10.0.24.2 24 [R2] int loop0 [R2] ip add 2.2.2.2 32 3、R3 sys sysname R3 [R3] int g0/0/0 [R3] ip add 10.0.13.3 24 [R3] int g0/0/1 [R3] ip add 10.0.34.3 24 [R3] int loop0 [R3] ip add 3.3.3.3 32 4、R4 sys sysname R4 [R4] int g0/0/0 [R4] ip add 10.0.24.4 24 [R4] int g0/0/1 [R4] ip add 10.0.34.4 24 [R4] int loop0 [R4] ip add 4.4.4.4 32
2、配置OSPF协议，使内网可互访
R2 [R2] ospf 1 [R2] area 0 [R2] network 10.0.24.0 0.0.0.255 [R2] network 2.2.2.2 0.0.0.0 R3 [R3] ospf 1 [R3] area 0 [R3] network 10.0.34.0 0.0.0.255 [R3] network 3.3.3.3 0.0.0.0 R4 [R4] ospf 1 [R4] area 0 [R4] network 10.0.24.0 0.0.0.255 [R4] network 10.0.34.0 0.0.0.255 [R4] network 4.4.4.4 0.0.0.0
3、配置BGP
[R1] bgp 100 [R1] router-id 1.1.1.1 [R1] peer 10.0.12.2 as-number 200 [R1] peer 10.0.13.3 as-number 200 [R1] network 1.1.1.1 32 [R2] bgp 200 [R2] router-id 2.2.2.2 [R2] peer 10.0.12.1 as-number 100 [R2] peer 10.0.24.4 as-number 200 [R2] peer 10.0.24.4 next-hop-local [R3] import-route ospf 1 [R3] bgp 200 [R3] router-id 3.3.3.3 [R3] peer 10.0.13.1 as-number 100 [R3] peer 10.0.34.4 as-number 200 [R3] peer 10.0.34.4 next-hop-local [R3] import-route ospf 1 [R4] bgp 200 [R4] router-id 4.4.4.4 [R4] peer 10.0.24.2 as-number 200 [R4] peer 10.0.34.3 as-number 200 [R4] network 4.4.4.4 32
4、查看BGP路由
[R1] dis bgp routing-table [R1] dis ip routing-table [R1] dis ospf routing
5、使用BGP属性控制选路
从R4到R1的通信，通过R3来传递
方法1：修改本地优先级（local-preference属性），默认值100，越大越优先
1、修改 [R3] route-policy lop permit node 10 [R3] apply local-preference 222 [R3] bgp 200 [R3] peer 10.0.34.4 route-policy lop export
2、查看 [R4] dis bgp routing-table
方法2：修改AS-PATH属性，越小越优先
1、删除前面的路由策略 [R3] bgp 200 [R3] undo peer 10.0.34.4 route-policy lop export
2、修改 [R2] route-policy as permit node 10 [R2] apply as-path 123 123 123 additive [R2] bgp 200 [R2] peer 10.0.24.4 route-policy as export
3、刷新bgp路由表 <R2> reset bgp all
4、查看 [R4] dis bgp routing-table 5、注意：方法1和方法2，修改的是从R4到R1的通信
方法3：修改MED属性，越小越优先
1、删除前面的路由策略 [R2] bgp 200 [R2] undo peer 10.0.24.4 route-policy as export
2、修改 [R2] route-policy med permit node 10 [R2] apply cost + 500 [R2] bgp 200 [R2] peer 10.0.12.1 route-policy med export
3、刷新bgp路由表 <R2> reset bgp all
4、查看 [R1] dis bgp routing-table
5、注意：方法3，修改的是从R1到R4的通信
标签：R4,10.0,R1,R2,R3,bgp,案例,华为 From： https://www.cnblogs.com/wuhg/p/17086481.html