在BGP最简单的实验基础上增加了一定的难度
实验拓扑图
实验步骤
根据需求可以看到这个实验只需要在R5、R6上有对方的路由条目即可，不需要数据流量真的能够到达。
这样的一个需求说明：在中间的65000的AS中只需要建立R1和R4之间的IBGP邻居关系，R2和R3上并不需要开启BGP协议。
理清思路之后就可以开始配置：
AR1:
interface LoopBack0
ip address 1.1.1.1 255.255.255.255
isis enable 1
#
interface GigabitEthernet0/0
ip address 12.0.0.1 255.255.255.0
isis enable 1
#
interface GigabitEthernet0/1
ip address 14.0.0.1 255.255.255.0
isis enable 1
#
interface GigabitEthernet0/2
ip address 11.0.0.1 255.255.255.0
isis enable 1
#
isis 1
network-entity 49.0001.0000.0000.0001.00
#
bgp 65000
peer 4.4.4.4 as-number 65000
peer 4.4.4.4 connect-interface LoopBack0
peer 11.0.0.5 as-number 65001
#
address-family ipv4 unicast
network 1.1.1.1 255.255.255.255
peer 4.4.4.4 enable
peer 4.4.4.4 next-hop-local
peer 11.0.0.5 enable
#
AR2:
#
interface LoopBack0
ip address 2.2.2.2 255.255.255.255
isis enable 1
#
interface GigabitEthernet0/0
ip address 12.0.0.2 255.255.255.0
isis enable 1
#
interface GigabitEthernet0/1
ip address 13.0.0.2 255.255.255.0
isis enable 1
#
isis 1
network-entity 49.0001.0000.0000.0002.00
#
AR3:
#
interface LoopBack0
ip address 3.3.3.3 255.255.255.255
isis enable 1
#
interface GigabitEthernet0/0
ip address 15.0.0.3 255.255.255.0
isis enable 1
#
interface GigabitEthernet0/1
ip address 14.0.0.3 255.255.255.0
isis enable 1
#
isis 1
network-entity 49.0001.0000.0000.0003.00
#
AR4:
interface LoopBack0
ip address 4.4.4.4 255.255.255.255
isis enable 1
#
interface GigabitEthernet0/0
ip address 15.0.0.4 255.255.255.0
isis enable 1
#
interface GigabitEthernet0/1
ip address 13.0.0.4 255.255.255.0
isis enable 1
#
interface GigabitEthernet0/2
ip address 16.0.0.4 255.255.255.0
isis enable 1
#
bgp 65000
peer 1.1.1.1 as-number 65000
peer 1.1.1.1 connect-interface LoopBack0
peer 16.0.0.6 as-number 65002
#
address-family ipv4 unicast
network 4.4.4.4 255.255.255.255
peer 1.1.1.1 enable
peer 1.1.1.1 next-hop-local
peer 16.0.0.6 enable
#
isis 1
network-entity 49.0001.0000.0000.0004.00
#
AR5:
#
interface LoopBack0
ip address 5.5.5.5 255.255.255.255
#
interface GigabitEthernet0/0
ip address 11.0.0.5 255.255.255.0
#
bgp 65001
peer 11.0.0.1 as-number 65000
#
address-family ipv4 unicast
import-route direct
network 5.0.0.0 255.0.0.0
peer 11.0.0.1 enable
#
AR6:
#
interface LoopBack0
ip address 6.6.6.6 255.255.255.255
#
interface GigabitEthernet0/0
ip address 16.0.0.6 255.255.255.0
#
bgp 65002
peer 16.0.0.4 as-number 65000
#
address-family ipv4 unicast
import-route direct
network 6.0.0.0 255.0.0.0
peer 16.0.0.4 enable
#