华为路由器BGP基础配置实验
【实验题目】
通过配置BGP环境实现1.1.1.1/24环回与5.5.5.5/24环回的连通（AS 2 内部使用OSPF协议）
【实验思路】
配置BGP的前提是要保证各个自治区域的路由均可达，所以要首先在AS 2 配置OSPF使AS 2 通畅，然后再配置BGP。由于BGP的路由黑洞问题，需要在BGP路由经过的所有路由器上配置BGP。又由于IBGP的水平分割机制，R2、R4之间需要建立对等体关系。习惯上，在IBGP中最好使用环回接口来建立对等体关系。
【实验记录】
一、为各个路由器创建环回接口，配置IP地址
sys
[Huawei]sys r1
[r1]interface LoopBack 0
[r1-LoopBack0]ip address 1.1.1.1 24
[r1-LoopBack0]q
[r1]int GigabitEthernet 0/0/0
[r1-GigabitEthernet0/0/0]ip address 12.0.0.1 24 sys
[Huawei]sys r2
[r2]int GigabitEthernet 0/0/1
[r2-GigabitEthernet0/0/1]ip address 12.0.0.2 24
[r2-GigabitEthernet0/0/1]int g0/0/0
[r2-GigabitEthernet0/0/0]ip address 23.0.0.1 24
[r2-GigabitEthernet0/0/0]q
[r2]int LoopBack 0
[r2-LoopBack0]ip address 2.2.2.2 24 sys
[Huawei]sys r3
[r3]int g0/0/1
[r3-GigabitEthernet0/0/1]ip address 23.0.0.2 24
[r3-GigabitEthernet0/0/1]int g0/0/0
[r3-GigabitEthernet0/0/0]ip address 34.0.0.1 24
[r3-GigabitEthernet0/0/0]q
[r3]int LoopBack 0
[r3-LoopBack0]ip address 3.3.3.3 24 sys
[Huawei]sys r4
[r4]int g0/0/1
[r4-GigabitEthernet0/0/1]ip address 34.0.0.2 24
[r4-GigabitEthernet0/0/1]int g0/0/0
[r4-GigabitEthernet0/0/0]ip address 45.0.0.1 24
[r4-GigabitEthernet0/0/0]q
[r4]int LoopBack 0
[r4-LoopBack0]ip address 4.4.4.4 24 sys
[Huawei]sys r5
[r5]int g0/0/1
[r5-GigabitEthernet0/0/1]ip address 45.0.0.2 24
[r5-GigabitEthernet0/0/1]q
[r5]int LoopBack 0
[r5-LoopBack0]ip address 5.5.5.5 24 二、在AS2内配置OSPF
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]a 0
[r2-ospf-1-area-0.0.0.0]network 23.0.0.0 0.0.0.255
[r2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]a 0
[r3-ospf-1-area-0.0.0.0]network 23.0.0.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 34.0.0.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]a 0
[r4-ospf-1-area-0.0.0.0]network 34.0.0.0 0.0.0.255
[r4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
检查路由表，并ping通测试，确保无误
三、建立BGP对等体关系
[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.0.0.2 as-number 2
[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.0.0.1 as-number 1
[r2-bgp]peer 3.3.3.3 as-number 2
[r2-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r2-bgp]peer 4.4.4.4 as-number 2
[r2-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r3]bgp 2
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 2.2.2.2 as-number 2
[r3-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r3-bgp]peer 4.4.4.4 as-number 2
[r3-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r4]bgp 2
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 2.2.2.2 as-number 2
[r4-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r4-bgp]peer 3.3.3.3 as-number 2
[r4-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r4-bgp]peer 45.0.0.2 as-number 3
[r5]bgp 3
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 45.0.0.1 as-number 2
查看对等体关系建立情况：
四、发布路由
发布1.1.1.1/24
[r1-bgp]network 1.1.1.0 24[r2-bgp]network 1.1.1.0 24
[r2-bgp]peer 3.3.3.3 next-hop-local
[r2-bgp]peer 4.4.4.4 next-hop-local发布5.5.5.5/24
[r5-bgp]network 5.5.5.0 24[r4-bgp]network 5.5.5.0 24
[r4-bgp]peer 2.2.2.2 next-hop-local
[r4-bgp]peer 3.3.3.3 next-hop-local
五、ping通测试
试验成功