一、实验拓扑
二、实验需求
1、每个设备存在两个环回接口
a.一个接口使用设备编号创建环回，掩码为32
示例：R1的环回为1.1.1.1/32
该环回用来建立BGP对等体关系或者作为BGP Router-ID使用
b.另一个环回接口使用设备编号创建，地址为192.168.x.0/24
示例：R1的环回为192.168.1.0/24
该环回用来模拟用户网段，节省拓扑图中的PC数量
c.其条网段自行规划
2、所有设备启动BGP协议
原因：避免BGP路由黑洞问题
3、在一个AS内部，建立全连接的IBGP对等体关系
原因：避免IBGP水平分割问题带来的路由传递故障
4、按照图示建立EBGP对等体和IBGP对等体关系
5、BGP仅传递用于模拟用户网段的接口路由信息
6、AS内部如有需要，自行选择IGP协议进行运行
7、实现所有模拟PC的环回接口之间相互通讯
三、实验思路
1、配置IP地址
2、配置IGP协议（OSPF），使AS内部通
3、配置BGP协议，使AS之间相互连通
a.手动配置BGP邻居
b.宣告本机业务网段
四、实验步骤
1、配置IP地址
R1
[R1]int g 0/0/0
[R1-GigabitEthernet0/0/0]ip address 100.1.12.1 24
[R1-GigabitEthernet0/0/0]int g 0/0/1
[R1-GigabitEthernet0/0/1]ip address 100.1.13.1 24
[R1-GigabitEthernet0/0/1]int l 0
[R1-LoopBack0]ip address 1.1.1.1 32
[R1-LoopBack0]int l 1
[R1-LoopBack1]ip address 192.168.1.1 24
[R1-LoopBack1]q
R2
[R2]int g 0/0/0
[R2-GigabitEthernet0/0/0]ip address 100.1.12.2 24
[R2-GigabitEthernet0/0/0]int g 0/0/1
[R2-GigabitEthernet0/0/1]ip address 100.1.24.2 24
[R2-GigabitEthernet0/0/1]int l 0
[R2-LoopBack0]ip address 2.2.2.2 32
[R2-LoopBack0]int l 1
[R2-LoopBack1]ip address 192.168.2.1 24
[R2-LoopBack1]q
R3
[R3]int g 0/0/0
[R3-GigabitEthernet0/0/0]ip address 100.1.13.3 24
[R3-GigabitEthernet0/0/0]int g 0/0/1
[R3-GigabitEthernet0/0/1]ip address 100.1.34.3 24
[R3-GigabitEthernet0/0/1]int g 0/0/2
[R3-GigabitEthernet0/0/2]ip address 100.1.36.3 24
[R3-GigabitEthernet0/0/2]int l 0
[R3-LoopBack0]ip address 3.3.3.3 32
[R3-LoopBack0]int l 1
[R3-LoopBack1]ip address 192.168.3.1 24
[R3-LoopBack1]q
R4
[R4]int g 0/0/0
[R4-GigabitEthernet0/0/0]ip address 100.1.24.4 24
[R4-GigabitEthernet0/0/0]int g 0/0/1
[R4-GigabitEthernet0/0/1]ip address 100.1.34.4 24
[R4-GigabitEthernet0/0/1]int g 0/0/2
[R4-GigabitEthernet0/0/2]ip address 100.1.45.4 24
[R4-GigabitEthernet0/0/2]int g 1/0/0
[R4-GigabitEthernet1/0/0]ip address 100.1.47.4 24
[R4-GigabitEthernet1/0/0]int l 0
[R4-LoopBack0]ip address 4.4.4.4 32
[R4-LoopBack0]int l 1
[R4-LoopBack1]ip address 192.168.4.1 24
[R4-LoopBack1]q
R5
[R5]int g 0/0/0
[R5-GigabitEthernet0/0/0]ip address 100.1.45.5 24
[R5-GigabitEthernet0/0/0]int l 0
[R5-LoopBack0]ip address 5.5.5.5 32
[R5-LoopBack0]int l 1
[R5-LoopBack1]ip address 192.168.5.1 24
[R5-LoopBack1]q
R6
[R6]int g 0/0/0
[R6-GigabitEthernet0/0/0]ip address 100.1.36.6 24
[R6-GigabitEthernet0/0/0]int g 0/0/1
[R6-GigabitEthernet0/0/1]ip address 100.1.67.6 24
[R6-GigabitEthernet0/0/1]int g 0/0/2
[R6-GigabitEthernet0/0/2]ip address 100.1.69.6 24
[R6-GigabitEthernet0/0/2]int l 0
[R6-LoopBack0]ip address 6.6.6.6 32
[R6-LoopBack0]int l 1
[R6-LoopBack1]ip address 192.168.6.1 24
[R6-LoopBack1]q
R7
[R7]int g 0/0/0
[R7-GigabitEthernet0/0/0]ip address 100.1.47.7 24
[R7-GigabitEthernet0/0/0]int g 0/0/1
[R7-GigabitEthernet0/0/1]ip address 100.1.67.7 24
[R7-GigabitEthernet0/0/1]int g 0/0/2
[R7-GigabitEthernet0/0/2]ip address 100.1.78.7 24
[R7-GigabitEthernet0/0/2]int g 1/0/0
[R7-GigabitEthernet1/0/0]ip address 100.1.107.7 24
[R7-GigabitEthernet1/0/0]int l 0
[R7-LoopBack0]ip address 7.7.7.7 32
[R7-LoopBack0]int l 1
[R7-LoopBack1]ip address 192.168.7.1 24
[R7-LoopBack1]q
R8
[R8]int g 0/0/0
[R8-GigabitEthernet0/0/0]ip address 100.1.78.8 24
[R8-GigabitEthernet0/0/0]int l 0
[R8-LoopBack0]ip address 8.8.8.8 32
[R8-LoopBack0]int l 1
[R8-LoopBack1]ip address 192.168.8.1 24
[R8-LoopBack1]q
R9
[R9]int g 0/0/0
[R9-GigabitEthernet0/0/0]ip address 100.1.69.9 24
[R9-GigabitEthernet0/0/0]int g 0/0/1
[R9-GigabitEthernet0/0/1]ip address 100.1.109.9 24
[R9-GigabitEthernet0/0/1]int l 0
[R9-LoopBack0]ip address 9.9.9.9 32
[R9-LoopBack0]int l 1
[R9-LoopBack1]ip address 192.168.9.1 24
[R9-LoopBack1]q
R10
[R10]int g 0/0/0
[R10-GigabitEthernet0/0/0]ip address 100.1.107.10 24
[R10-GigabitEthernet0/0/0]int g 0/0/1
[R10-GigabitEthernet0/0/1]ip address 100.1.109.10 24
[R10-GigabitEthernet0/0/1]int l 0
[R10-LoopBack0]ip address 10.10.10.10 32
[R10-LoopBack0]int l 1
[R10-LoopBack1]ip address 192.168.10.1 24
[R10-LoopBack1]q
2、配置IGP协议
R2
[R2]ospf 1 router-id 2.2.2.2
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 100.1.24.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[R2-ospf-1-area-0.0.0.0]network 192.168.2.0 0.0.0.255
[R2-ospf-1-area-0.0.0.0]q
[R2-ospf-1]q
R3
[R3]ospf 1 router-id 3.3.3.3
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 100.1.34.0 0.0.0.255
[R3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[R3-ospf-1-area-0.0.0.0]network 192.168.3.0 0.0.0.255
[R3-ospf-1-area-0.0.0.0]q
[R3-ospf-1]q
R4
[R4]ospf 1 router-id 4.4.4.4
[R4-ospf-1]area 0
[R4-ospf-1-area-0.0.0.0]network 100.1.24.0 0.0.0.255
[R4-ospf-1-area-0.0.0.0]network 100.1.34.0 0.0.0.255
[R4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[R4-ospf-1-area-0.0.0.0]network 192.168.4.0 0.0.0.255
[R4-ospf-1-area-0.0.0.0]q
[R4-ospf-1]q
R9
[R9]ospf 1 router-id 9.9.9.9
[R9-ospf-1]area 0
[R9-ospf-1-area-0.0.0.0]network 100.1.109.0 0.0.0.255
[R9-ospf-1-area-0.0.0.0]network 9.9.9.9 0.0.0.0
[R9-ospf-1-area-0.0.0.0]network 192.168.9.0 0.0.0.255
[R9-ospf-1-area-0.0.0.0]q
[R9-ospf-1]q
R10
[R10]ospf 1 router-id 10.10.10.10
[R10-ospf-1]area 0
[R10-ospf-1-area-0.0.0.0]network 100.1.109.0 0.0.0.255
[R10-ospf-1-area-0.0.0.0]network 10.10.10.10 0.0.0.0
[R10-ospf-1-area-0.0.0.0]network 192.168.10.0 0.0.0.255
[R10-ospf-1-area-0.0.0.0]q
[R10-ospf-1]q
3、配置BGP协议
a.手动配置BGP邻居
R1
[R1]bgp 100
[R1-bgp]router-id 1.1.1.1
[R1-bgp]peer 100.1.12.2 as-number 200
[R1-bgp]peer 100.1.13.3 as-number 200
[R1-bgp]q
R2
[R2]bgp 200
[R2-bgp]router-id 2.2.2.2
[R2-bgp]peer 100.1.12.1 as-number 100
[R2-bgp]peer 4.4.4.4 as-number 200
[R2-bgp]peer 4.4.4.4 connect-interface l0
[R2-bgp]peer 4.4.4.4 next-hop-local
[R2-bgp]peer 3.3.3.3 as-number 200
[R2-bgp]peer 3.3.3.3 connect-interface l0
[R2-bgp]peer 3.3.3.3 next-hop-local
[R2-bgp]q
R3
[R3]bgp 200
[R3-bgp]router-id 3.3.3.3
[R3-bgp]peer 100.1.13.1 as-number 100
[R3-bgp]peer 4.4.4.4 as-number 200
[R3-bgp]peer 4.4.4.4 connect-interface l0
[R3-bgp]peer 4.4.4.4 next-hop-local
[R3-bgp]peer 2.2.2.2 as-number 200
[R3-bgp]peer 2.2.2.2 connect-interface l0
[R3-bgp]peer 2.2.2.2 next-hop-local
[R3-bgp]p
R4
[R4]bgp 200
[R4-bgp]router-id 4.4.4.4
[R4-bgp]peer 2.2.2.2 as-number 200
[R4-bgp]peer 2.2.2.2 connect-interface l0
[R4-bgp]peer 2.2.2.2 next-hop-local
[R4-bgp]peer 3.3.3.3 as-number 200
[R4-bgp]peer 3.3.3.3 connect-interface l0
[R4-bgp]peer 3.3.3.3 next-hop-local
[R4-bgp]peer 100.1.45.5 as-number 300
[R4-bgp]peer 100.1.47.7 as-number 400
[R4-bgp]p
R5
[R5]bgp 300
[R5-bgp]router-id 5.5.5.5
[R5-bgp]peer 100.1.45.4 as-number 200
[R5-bgp]q
R6
[R6]bgp 300
[R6-bgp]router-id 6.6.6.6
[R6-bgp]peer 100.1.36.3 as-number 200
[R6-bgp]peer 100.1.67.7 as-number 400
[R6-bgp]peer 100.1.69.9 as-number 500
[R6-bgp]q
R7
[R7]bgp 400
[R7-bgp]router-id 7.7.7.7
[R7-bgp]peer 100.1.47.4 as-number 200
[R7-bgp]peer 100.1.67.6 as-number 300
[R7-bgp]peer 100.1.78.8 as-number 500
[R7-bgp]peer 100.1.107.10 as-number 500
[R7-bgp]q
R8
[R8]bgp 500
[R8-bgp]router-id 8.8.8.8
[R8-bgp]peer 100.1.78.7 as-number 400
[R8-bgp]q
R9
[R9]bgp 500
[R9-bgp]router-id 9.9.9.9
[R9-bgp]peer 100.1.69.6 as-number 300
[R9-bgp]peer 10.10.10.10 as-number 500
[R9-bgp]peer 10.10.10.10 connect-interface l0
[R9-bgp]peer 10.10.10.10 next-hop-local
[R9-bgp]q
R10
[R10]bgp 500
[R10-bgp]peer 100.1.107.7 as-number 400
[R10-bgp]peer 9.9.9.9 as-number 500
[R10-bgp]peer 9.9.9.9 connect-interface l0
[R10-bgp]peer 9.9.9.9 next-hop-local
[R10-bgp]q
b.宣告本机业务网段
R1
[R1]bgp 100
[R1-bgp]network 192.168.1.0 24
[R1-bgp]q
R2
[R2]bgp 200
[R2-bgp]network 192.168.2.0 24
[R2-bgp]q
R3
[R3]bgp 200
[R3-bgp]network 192.168.3.0 24
[R3-bgp]q
R4
[R4]bgp 200
[R4-bgp]network 192.168.4.0 24
[R4-bgp]q
R5
[R5]bgp 300
[R5-bgp]network 192.168.5.0 24
[R5-bgp]peer 100.1.45.4 allow-as-loop
[R5-bgp]q
R6
[R6]bgp 300
[R6-bgp]network 192.168.6.0 24
[R6-bgp]peer 100.1.36.3 allow-as-loop
[R6-bgp]q
R7
[R7]bgp 400
[R7-bgp]network 192.168.7.0 24
[R7-bgp]q
R8
[R8]bgp 500
[R8-bgp]network 192.168.8.0 24
[R8-bgp]peer 100.1.78.7 allow-as-loop
[R8-bgp]q
R9
[R9]bgp 500
[R9-bgp]network 192.168.9.0 24
[R9-bgp]q
R10
[R10]bgp 500
[R10-bgp]network 192.168.10.0 24
[R10-bgp]qerer
