BGP选路原则之AS_Path属性（bgp路由中as-path作用）

BGP选路原则之AS_Path属性（bgp路由中as-path作用）

AS_Path选路属性实验 ● AS_Path属性描述这条路由所途径的BGP自制系统（即路过了哪些AS），越短越优！

拓扑：

要求：使用AS_Path方式，在AR4上修改AR5传递过来的192.168.1.0/24路由条目，让AR4去往192.168.1.0/24的网络走AR6路由上、而非直连路由器AR5上。

AR1配置：

interface GigabitEthernet0/0/0 ip address 12.0.0.1 255.255.255.0 interface GigabitEthernet0/0/1 ip address 16.0.0.1 255.255.255.0

bgp 1 peer 12.0.0.2 as-number 234 peer 16.0.0.6 as-number 6

ipv4-family unicast undo synchronization peer 12.0.0.2 enable peer 16.0.0.6 enable

AR2配置：

interface GigabitEthernet0/0/0 ip address 23.0.0.2 255.255.255.0 interface GigabitEthernet0/0/1 ip address 12.0.0.2 255.255.255.0 interface LoopBack0 ip address 2.2.2.2 255.255.255.255

bgp 234 peer 4.4.4.4 as-number 234 peer 4.4.4.4 connect-interface LoopBack0 peer 12.0.0.1 as-number 1 # ipv4-family unicast undo synchronization peer 4.4.4.4 enable peer 4.4.4.4 next-hop-local peer 12.0.0.1 enable

ospf 1 router-id 2.2.2.2 area 0.0.0.0 network 2.2.2.2 0.0.0.0 network 23.0.0.2 0.0.0.0

AR3配置：

interface GigabitEthernet0/0/0 ip address 23.0.0.3 255.255.255.0 interface GigabitEthernet0/0/1 ip address 34.0.0.3 255.255.255.0 interface LoopBack0 ip address 3.3.3.3 255.255.255.255

ospf 1 router-id 3.3.3.3 area 0.0.0.0 network 3.3.3.3 0.0.0.0 network 23.0.0.3 0.0.0.0 network 34.0.0.3 0.0.0.0

ip route-static 0.0.0.0 0.0.0.0 23.0.0.2

AR4配置：

interface GigabitEthernet0/0/0 ip address 34.0.0.4 255.255.255.0 interface GigabitEthernet0/0/1 ip address 45.0.0.4 255.255.255.0 interface LoopBack0 ip address 4.4.4.4 255.255.255.255

bgp 234 peer 2.2.2.2 as-number 234 peer 2.2.2.2 connect-interface LoopBack0 peer 45.0.0.5 as-number 5

ipv4-family unicast undo synchronization import-route ospf 1 peer 2.2.2.2 enable peer 2.2.2.2 next-hop-local peer 45.0.0.5 enable peer 45.0.0.5 route-policy as5_import import

ospf 1 router-id 4.4.4.4 area 0.0.0.0 network 4.4.4.4 0.0.0.0 network 34.0.0.4 0.0.0.0

route-policy as5_import permit node 10 if-match ip-prefix 192.168.1.0 apply as-path 100 200 300 additive //在原有AS路径上，增加新AS，将新AS添加到原有AS左侧

route-policy as5_import permit node 20

ip ip-prefix 192.168.1.0 index 10 permit 192.168.1.0 24

AR5配置：

interface GigabitEthernet0/0/0 ip address 45.0.0.5 255.255.255.0 interface GigabitEthernet0/0/1 ip address 192.168.1.1 255.255.255.0

bgp 5 peer 45.0.0.4 as-number 234 # ipv4-family unicast undo synchronization network 192.168.1.0 peer 45.0.0.4 enable

ip route-static 192.168.1.0 255.255.255.0 NULL0

AR6配置：

interface GigabitEthernet0/0/0 ip address 16.0.0.6 255.255.255.0 interface LoopBack1 ip address 192.168.1.1 255.255.255.0

bgp 6 peer 16.0.0.1 as-number 1 # ipv4-family unicast undo synchronization network 192.168.1.0 peer 16.0.0.1 enable

ip route-static 192.168.1.0 255.255.255.0 NULL0

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