Cisco-配置EBGP实例

Posted 2023-03-09

Cisco-配置EBGP实例

一、网络拓扑图

二、IP地址规划表

设备	接口	IP地址
R1	G0/0	10.0.0.1/30
R1	G0/1	40.0.0.1/30
R1	G0/2	192.168.10.254/24
R2	G0/0	10.0.0.2/30
R2	G0/1	20.0.0.2/30
R2	G0/2	192.168.20.254/24
R3	G0/0	30.0.0.1/30
R3	G0/1	20.0.0.1/30
R3	G0/2	192.168.30.254/24
R4	G0/0	40.0.0.2/30
R4	G0/1	30.0.0.2/30
R4	G0/2	192.168.40.254/24
PC0	Fa0	192.168.10.1/24
PC1	Fa0	192.168.20.1/24
PC2	Fa0	192.168.30.1/24
PC3	Fa0	192.168.40.1/24

三、操作步骤（IP地址自己配置，这里不做演示）

1、路由器进入BGP配置模式，AS编号分别为1、2、3、4

R1

R1(config)#router bgp 1

R2

R2(config)#router bgp 2

R3

R3(config)#router bgp 3

R4

R4(config)#router bgp 4

2、BGP宣告直连网段

R1

R1(config-router)#network 192.168.10.0 mask 255.255.255.0

R1(config-router)#network 10.0.0.0 mask 255.255.255.252

R1(config-router)#network 40.0.0.0 mask 255.255.255.252

R2

R2(config-router)#network 192.168.20.0 mask 255.255.255.0

R2(config-router)#network 10.0.0.0 mask 255.255.255.252

R2(config-router)#network 20.0.0.0 mask 255.255.255.252

R3

R3(config-router)#network 192.168.30.0 mask 255.255.255.0

R3(config-router)#network 20.0.0.0 mask 255.255.255.252

R3(config-router)#network 30.0.0.0 mask 255.255.255.252

R4

R4(config-router)#network 192.168.40.0 mask 255.255.255.0

R4(config-router)#network 30.0.0.0 mask 255.255.255.252

R4(config-router)#network 40.0.0.0 mask 255.255.255.252

3、指定邻居的ip和AS编号

R1

R1(config-router)#neighbor 10.0.0.2 remote-as 2

R1(config-router)#neighbor 40.0.0.2 remote-as 4

R2

R2(config-router)#neighbor 10.0.0.1 remote-as 1

R2(config-router)#neighbor 20.0.0.1 remote-as 3

R3

R3(config-router)#neighbor 20.0.0.2 remote-as 2

R3(config-router)#neighbor 30.0.0.2 remote-as 4

R4

R4(config-router)#neighbor 30.0.0.1 remote-as 3

R4(config-router)#neighbor 40.0.0.1 remote-as 1

4、验证BGP

R1

R2

R3

R4

PC0访问PC1、PC2和PC3