BGP综合实验

一、实验拓扑图

二、实验需求

1、AS1存在两个环回，一个地址为192.168.1.0/24，该地址不能在任何协议中宣告，AS3存在两个环回，一个地址为192.168.2.0/24，该地址不能在任何协议中宣告，最终要求这两个环回可以相互通讯
2、整个AS2的IP地址为172.16.0.0/22，请合理划分
3、AS间的骨干链路IP地址随意定制
4、使用BGP协议让整个网络所有设备的环回可以相互访问
5、减少路由条目数量，避免环路出现

三、实验配置

1、AS2区域IP地址划分

2、IP地址及环回地址配置

#R1
[R1]int l 0
[R1-LoopBack0]ip address 192.168.1.1 24
[R1-LoopBack0]int l 1
[R1-LoopBack1]ip address 1.1.1.1 24
[R1-LoopBack1]int g 0/0/0
[R1-GigabitEthernet0/0/0]ip address 12.0.0.1 24

#R2
[R2]int l 0	
[R2-LoopBack0]ip address 172.16.1.1 24
[R2-LoopBack0]int g 0/0/0
[R2-GigabitEthernet0/0/0]ip address 12.0.0.2 24
[R2-GigabitEthernet0/0/0]int g 0/0/1
[R2-GigabitEthernet0/0/1]ip address 172.16.0.1 29
[R2-GigabitEthernet0/0/1]int g 0/0/2
[R2-GigabitEthernet0/0/2]ip address 172.16.0.17 29

#R3
[R3]int l 0	
[R3-LoopBack0]ip address 172.16.2.1 24
[R3-LoopBack0]int g 0/0/0
[R3-GigabitEthernet0/0/0]ip address 172.16.0.2 29
[R3-GigabitEthernet0/0/0]int g 0/0/1
[R3-GigabitEthernet0/0/1]ip address 172.16.0.9 29

#R4
[R4]int l 0	
[R4-LoopBack0]ip address 172.16.3.1 24
[R4-LoopBack0]int g 0/0/0
[R4-GigabitEthernet0/0/0]ip address 172.16.0.10 29
[R4-GigabitEthernet0/0/0]int g 0/0/1	
[R4-GigabitEthernet0/0/1]ip address 172.16.0.41 29

#R5
[R5]int l 0
[R5-LoopBack0]ip address 172.16.4.1 24
[R5-LoopBack0]int g 0/0/0
[R5-GigabitEthernet0/0/0]ip address 172.16.0.18 29
[R5-GigabitEthernet0/0/0]int g 0/0/1
[R5-GigabitEthernet0/0/1]ip address 172.16.0.25 29

#R6
[R6]int l 0
[R6-LoopBack0]ip address 172.16.5.1 24
[R6-LoopBack0]int g 0/0/0
[R6-GigabitEthernet0/0/0]ip address 172.16.0.26 29
[R6-GigabitEthernet0/0/0]int g 0/0/1
[R6-GigabitEthernet0/0/1]ip address 172.16.0.33 29

#R7
[R7]int l 0
[R7-LoopBack0]ip address 172.16.6.1 24
[R7-LoopBack0]int g 0/0/0
[R7-GigabitEthernet0/0/0]ip address 172.16.0.42 29
[R7-GigabitEthernet0/0/0]int g 0/0/1
[R7-GigabitEthernet0/0/1]ip address 172.16.0.34 29
[R7-GigabitEthernet0/0/1]int g 0/0/2
[R7-GigabitEthernet0/0/2]ip address 78.0.0.1 24

#R8
[R8]int l 0	
[R8-LoopBack0]ip address 192.168.2.1 24
[R8-LoopBack0]int l 1	
[R8-LoopBack1]ip address 8.8.8.8 24
[R8-LoopBack1]int g 0/0/0
[R8-GigabitEthernet0/0/0]ip address 78.0.0.2 24

3、AS2启动OSPF协议，使AS2全网可达

[R2]ospf 1
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 172.16.0.1 0.0.0.0
[R2-ospf-1-area-0.0.0.0]network 172.16.1.1 0.0.0.0
[R2-ospf-1-area-0.0.0.0]network 172.16.0.17 0.0.0.0

[R3]ospf 1
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]network 172.16.2.1 0.0.0.0
[R3-ospf-1-area-0.0.0.0]network 172.16.0.2 0.0.0.0
[R3-ospf-1-area-0.0.0.0]network 172.16.0.9 0.0.0.0

[R4]ospf 1
[R4-ospf-1]area 0
[R4-ospf-1-area-0.0.0.0]net	
[R4-ospf-1-area-0.0.0.0]network 172.16.3.1 0.0.0.0
[R4-ospf-1-area-0.0.0.0]network 171.16.0.41 0.0.0.0
[R4-ospf-1-area-0.0.0.0]network 172.16.0.10 0.0.0.0

[R5]ospf 1
[R5-ospf-1]area 0
[R5-ospf-1-area-0.0.0.0]network 172.16.4.1 0.0.0.0
[R5-ospf-1-area-0.0.0.0]network 172.16.0.25 0.0.0.0
[R5-ospf-1-area-0.0.0.0]network 172.16.0.18 0.0.0.0

[R6]ospf 1
[R6-ospf-1]area 0
[R6-ospf-1-area-0.0.0.0]network 172.16.5.1 0.0.0.0
[R6-ospf-1-area-0.0.0.0]network 172.16.0.33 0.0.0.0
[R6-ospf-1-area-0.0.0.0]network 172.16.0.26 0.0.0.0

[R7]ospf 1
[R7-ospf-1]area 0
[R7-ospf-1-area-0.0.0.0]network 172.16.6.1 0.0.0.0
[R7-ospf-1-area-0.0.0.0]network 172.16.0.34 0.0.0.0
[R7-ospf-1-area-0.0.0.0]network 172.16.0.42 0.0.0.0

3、建立EBGP、联邦EBGP对等体

[R1]bgp 1	
[R1-bgp]peer 12.0.0.2 as-number 2
[R1-bgp]network 1.1.1.1 24

[R2]bgp 64512
[R2-bgp]confederation id 2
[R2-bgp]peer 12.0.0.1 as-number 1
[R2-bgp]confederation peer-as 64513
[R2-bgp]peer 172.16.0.18 as-number 64513

[R4]bgp 64512
[R4-bgp]confederation id 2
[R4-bgp]confederation peer-as 64513
[R4-bgp]peer 172.16.0.42 as-number 64513

[R5]bgp 64513
[R5-bgp]confederation id 2
[R5-bgp]confederation peer-as 64512
[R5-bgp]peer 172.16.0.17 as-number 64512

[R7]bgp 64513
[R7-bgp]confederation id 2
[R7-bgp]confederation peer-as 64512
[R7-bgp]peer 172.16.0.41 as-number 64512
[R7-bgp]peer 78.0.0.2 as-number 3

[R8]bgp 3
[R8-bgp]peer 78.0.0.1 as-number 2
[R8-bgp]network 8.8.8.8 24

4、建立IBGP对等体关系

[R2-bgp]peer 172.16.2.1 as-number 64512
[R2-bgp]peer 172.16.2.1 connect-interface LoopBack 0
	
[R3-bgp]peer 172.16.1.1 as-number 64512
[R3-bgp]peer 172.16.1.1 connect-interface LoopBack 0
[R3-bgp]peer 172.16.3.1 as-number 64512
[R3-bgp]peer 172.16.3.1 connect-interface LoopBack 0

[R4-bgp]peer 172.16.2.1 as-number 64512
[R4-bgp]peer 172.16.2.1 connect-interface LoopBack 0

[R5-bgp]peer 172.16.5.1 as-number 64513
[R5-bgp]peer 172.16.5.1 connect-interface LoopBack 0

[R6-bgp]peer 172.16.4.1 as-number 64513
[R6-bgp]peer 172.16.4.1 connect-interface LoopBack 0
[R6-bgp]peer 172.16.6.1 as-number 64513
[R6-bgp]peer 172.16.6.1 connect-interface LoopBack 0

[R7-bgp]peer 172.16.5.1 as-number 64513
[R7-bgp]peer 172.16.5.1 connect-interface LoopBack 0

5、将下一跳属性改为本身

[R2-bgp]peer 172.16.2.1 next-hop-local
[R2-bgp]peer 172.16.0.18 next-hop-local

[R7-bgp]peer 172.16.0.41 next-hop-local
[R7-bgp]peer 172.16.5.1 next-hop-local

6、做反射器

[R3-bgp]peer 172.16.1.1 reflect-client

7、在AS2边界设备重发布OSPF

[R2-bgp]import-route ospf 1

8、边界设备做空接口，防止环路，并宣告边界设备的环回

[R2]ip route-static 172.16.0.0 16 NULL 0
[R2-bgp]network 172.16.0.0 16

[R7]ip route-static 172.16.0.0 16 NULL 0
[R7-bgp]network 172.16.0.0 16

9、检查环回间相互访问情况

经测试，所有环回均可相互访问

10、给两个固定环回搭建隧道

[R1]int t 0/0/0
[R1-Tunnel0/0/0]ip address 192.168.10.1 24
[R1-Tunnel0/0/0]tunnel-protocol gre
[R1-Tunnel0/0/0]source 1.1.1.1 
[R1-Tunnel0/0/0]destination 8.8.8.8
[R1]ip route-static 192.168.2.0 24 192.168.10.2

[R8]int t 0/0/0
[R8-Tunnel0/0/0]ip address 192.168.10.2 24
[R8-Tunnel0/0/0]tunnel-protocol gre
[R8-Tunnel0/0/0]source 8.8.8.8
[R8-Tunnel0/0/0]destination 1.1.1.1
[R2]ip route-static 192.168.1.0 24 192.168.10.1

测试其连通性