BGP实验

一、题目 ：

二、拓扑搭建

实验内容：首先有三个A3，要求AS上的每个环回都可以PING通
因为没有要求IP地址的配置所有我们自己来配置IP地址
首先到R1上来配置IP
R1:
interface GigabitEthernet0/0/0
ip address 12.1.1.1 255.255.255.0
interface LoopBack0
ip address 1.1.1.1 255.255.255.0
R2:
interface GigabitEthernet0/0/0
ip address 23.1.1.1 255.255.255.0
interface GigabitEthernet0/0/1
ip address 12.1.1.2 255.255.255.0
interface LoopBack0
ip address 2.2.2.2 255.255.255.0
R3:
interface GigabitEthernet0/0/0
ip address 34.1.1.1 255.255.255.0
interface GigabitEthernet0/0/1
ip address 23.1.1.2 255.255.255.0
interface LoopBack0
ip address 3.3.3.3 255.255.255.0
R4:
interface GigabitEthernet0/0/0
ip address 45.1.1.1 255.255.255.0
interface GigabitEthernet0/0/1
ip address 34.1.1.2 255.255.255.0
interface GigabitEthernet0/0/2
ip address 54.1.1.1 255.255.255.0
interface LoopBack0
ip address 4.4.4.4 255.255.255.0
R5:
interface GigabitEthernet0/0/0
ip address 45.1.1.2 255.255.255.0
interface GigabitEthernet0/0/2
ip address 54.1.1.2 255.255.255.0
interface LoopBack0
ip address 5.5.5.5 255.255.255.0
这时候我们把所有的IP地址配置完成接着开始写IGP把自身AS2写通我们使用OSPF 来写
R2:
ospf 1 router-id 2.2.2.2
area 0.0.0.0
network 2.2.2.2 0.0.0.0
network 23.1.1.1 0.0.0.0
R3:
ospf 1 router-id 3.3.3.3
area 0.0.0.0
network 3.3.3.3 0.0.0.0
network 23.1.1.2 0.0.0.0
network 34.1.1.1 0.0.0.0
R4:
ospf 1 router-id 4.4.4.4
area 0.0.0.0
network 4.4.4.4 0.0.0.0
network 34.1.1.2 0.0.0.0
这时候我们开始检查一下用R2的环回来PINGR3和R4的环回再用R3的环回来PINGR4的可看出都通

我们的IGP写完开始写EGP 先开始写EBGP
R1:
bgp 1
peer 12.1.1.2 as-number 2
然后再宣告1.1.1.1 24
R2:
bgp 2
peer 3.3.3.3 as-number 2
peer 3.3.3.3 connect-interface LoopBack0
peer 4.4.4.4 as-number 2
peer 4.4.4.4 connect-interface LoopBack0
peer 12.1.1.1 as-number 1
然后再宣告
peer 3.3.3.3 next-hop-local
peer 4.4.4.4 next-hop-local
R3:
peer 2.2.2.2 as-number 2
peer 2.2.2.2 connect-interface LoopBack0
peer 4.4.4.4 as-number 2
peer 4.4.4.4 connect-interface LoopBack0
network 3.3.3.0 255.255.255.0
然后再2和4建邻居
R4:
ip route-static 5.5.5.5 255.255.255.255 54.1.1.2
ip route-static 5.5.5.5 255.255.255.255 45.1.1.2
peer 2.2.2.2 as-number 2
peer 2.2.2.2 connect-interface LoopBack0
peer 3.3.3.3 as-number 2
peer 3.3.3.3 connect-interface LoopBack0
peer 5.5.5.5 as-number 3
peer 5.5.5.5 ebgp-max-hop 255
peer 5.5.5.5 connect-interface LoopBack0
network 4.4.4.0 255.255.255.0
peer 2.2.2.2 next-hop-local
peer 3.3.3.3 next-hop-local
R5:
ip route-static 4.4.4.4 32 45.1.1.1
ip route-static 4.4.4.4 32 54.1.1.1
bgp 3
peer 4.4.4.4 as-number 2
peer 4.4.4.4 ebgp-max-hop 255
peer 4.4.4.4 connect-interface LoopBack0
network 5.5.5.0 255.255.255.0
这时候我们观察我们的BGP表
R1:

R2:

R3:

R4

R5