一、实验拓扑

二、实验需求

1、R2-7每台路由器均存在一个环回接口用于建立邻居，同时还存在一个环回来代表连接用户的接口;最终这些连接用户的接口网络需要可以和R1/8的环回通讯
2、AS2网段地址172.16.0.0/16 减路由条目数量

三、实验步骤

首先配置IP

R1配置

[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip address 12.1.1.1 24
[r1-GigabitEthernet0/0/0]int l 0
[r1-LoopBack0]ip ad 1.1.1.1 24
[r1-LoopBack0]int l 1
[r1-LoopBack1]ip address 132.1.1.1 32

R2配置

[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ip address 12.1.1.2 24
[r2-GigabitEthernet0/0/0]int l 0
[r2-LoopBack0]ip address 172.16.1.1 24
[r2-LoopBack0]int l1
[r2-LoopBack1]ip address 132.1.1.2 32

[r2]int g0/0/1
[r2-GigabitEthernet0/0/1]ip address 172.16.0.1 30
[r2-GigabitEthernet0/0/1]int g0/0/02
[r2-GigabitEthernet0/0/2]ip address 172.16.0.21 30

注意一会要在AS2中配置ospf，所以要修改环回0的的接口类型

[r2-LoopBack0]ospf network-type broadcast

R3配置

[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ip address 172.16.0.2 30
[r3-GigabitEthernet0/0/0]int g0/0/01
[r3-GigabitEthernet0/0/1]ip address 172.16.0.5 30

[r3]int l 0
[r3-LoopBack0]ip address 172.16.2.1 24
[r3-LoopBack0]ospf network-type broadcast

[r3-LoopBack1]ip address 132.1.1.3 32

R4配置

[Huawei]int g0/0/0
[Huawei-GigabitEthernet0/0/0]ip address 172.16.0.6 30
[Huawei-GigabitEthernet0/0/0]int g0/0/1
[Huawei-GigabitEthernet0/0/1]ip address 172.16.0.9 30
[Huawei-GigabitEthernet0/0/1]int l 0
[Huawei-LoopBack0]ip address 172.16.3.1 24
[Huawei-LoopBack0]ospf network-type broadcast
[Huawei-LoopBack0]int l1
[Huawei-LoopBack1]ip address 132.1.1.4 32

R7配置

[r7] int g0/0/0
[r7-GigabitEthernet0/0/0]ip address 172.16.0.10 30
[r7-GigabitEthernet0/0/0]int g0/0/1
[r7-GigabitEthernet0/0/1]ip address 172.16.0.14 30
[r7-GigabitEthernet0/0/1]int l0
[r7-LoopBack0]ip address 172.16.6.1 24

[r7-LoopBack0]ospf network-type broadcast
[r7-LoopBack0]int l 1
[r7-LoopBack1]ip address 132.1.1.7 32

[r7-GigabitEthernet0/0/2]ip ad 78.1.1.1 24

R6配置

[r6]int g0/0/2
[r6-GigabitEthernet0/0/2]ip address 172.16.0.13 30
[r6-GigabitEthernet0/0/2]int g0/0/1
[r6-GigabitEthernet0/0/1]ip address 172.16.0.18 30
[r6-GigabitEthernet0/0/1]int l 0
[r6-LoopBack0]ip address 172.16.5.1 24
[r6-LoopBack0]int l1
[r6-LoopBack1]ip address 132.1.1.6 32
[r6-LoopBack1]int l 0
[r6-LoopBack0]ospf network-type broadcast

R5配置

[r5]int g0/0/01
[r5-GigabitEthernet0/0/1]ip address 172.16.0.17 30
[r5-GigabitEthernet0/0/1]int g0/0/0
[r5-GigabitEthernet0/0/0]ip address 172.16.0.22 30
[r5-GigabitEthernet0/0/0]int l0
[r5-LoopBack0]ip address 172.16.4.1 24
[r5-LoopBack0]int l1
[r5-LoopBack1]ip address 132.1.1.5 32

[r5-LoopBack0]ospf network-type broadcast

R8配置

[r8]int g0/0/0
[r8-GigabitEthernet0/0/0]ip address 78.1.1.2 24
[r8-GigabitEthernet0/0/0]int l0
[r8-LoopBack0]ip address 8.8.8.8 24
[r8-LoopBack0]int l1
[r8-LoopBack1]ip address 132.1.1.8 32

现在配置AS2中ospf仅以R3作为例子

[r3]ospf 1
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

然后开配置BGP

先在R1和R2环回1之间配置两条路由保证可达，R7和R8同理，下面仅以R1和R2做例子

[r1]ip route-static 132.1.1.2 32 12.1.1.2

[r2]ip route-static 132.1.1.1 32 12.1.1.1

测试可以ping通

配置BGP 、BGP间建邻仅以R1、R2、R3作为例子

[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.1.1.2 as-number 2

[r2]bgp 64512
[r2-bgp]router-id 2.2.2.2
[r2-bgp]confederation id 2
[r2-bgp]confederation peer-as 64513
[r2-bgp]peer 12.1.1.1 as-number 1
[r2-bgp]peer 132.1.1.3 as-number 64512
[r2-bgp]peer 132.1.1.3 connect-interface LoopBack 1
[r2-bgp]peer 132.1.1.5 as-number 64513
[r2-bgp]peer 132.1.1.5 connect-interface LoopBack 1
[r2-bgp]peer 132.1.1.5 ebgp-max-hop 2

[r3]bgp 64512
[r3-bgp]router-id 3.3.3.3
[r3-bgp]confederation id 2
[r3-bgp]peer 132.1.1.2as-number 64512
[r3-bgp]peer 132.1.1.2 connect-interface LoopBack 1
[r3-bgp]peer 132.1.1.4 as-number 64512
[r3-bgp]peer 132.1.1.4 connect-interface LoopBack 1