路由引入是一种复制路由表的操作，它将被引入的路由在路由表中的所有标记路由以及属于该被引入路由协议的直连路由复制到相应的路由协议，并初始化开销。这个操作是一种距离矢量的操作。
一.拓扑图
.
1.路由器AR1配置：
AR1]int LoopBack 0
[AR1-LoopBack0]ip add 6.6.6.6 32
[AR1-LoopBack0]quit
[AR1]int g0/0/0
[AR1-GigabitEthernet0/0/0]ip add 192.168.1.1 24
[AR1-GigabitEthernet0/0/0]quit//OSPF宣告网段
[AR1-ospf-1] area 0
[AR1-ospf-1-area-0.0.0.0]network 6.6.6.6 0.0.0.0
[AR1-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
[AR1-ospf-1-area-0.0.0.0]network 192.168.3.0 0.0.0.255
[AR1-ospf-1-area-0.0.0.0]quit
[AR1-GigabitEthernet0/0/0]ospf enable 1 area 0
[AR1-GigabitEthernet0/0/0]quit
[AR1]int g0/0/1
[AR1-GigabitEthernet0/0/1]ospf enable 1 area 0
[AR1-GigabitEthernet0/0/1]quit
2.路由器AR2配置：
[AR2]int g0/0/0
[AR2-GigabitEthernet0/0/0]ip add 192.168.1.2 24
[AR2-GigabitEthernet0/0/0]quit
[AR2]int g0/0/1
[AR2-GigabitEthernet0/0/1]ip add 192.168.2.1 24
[AR2-GigabitEthernet0/0/1]quit[AR2]ospf 1 router-id 2.2.2.2
[AR2-ospf-1]area 0
[AR2-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
[AR2-ospf-1-area-0.0.0.0]quit
[AR2-isis-1]network-entity 49.0001.0000.0000.0002.00
[AR2-isis-1]is-level level-2//进入端口启用OSPF和ISIS
[AR2]int g0/0/0
[AR2-GigabitEthernet0/0/0]ospf enable 1 area 0
[AR2-GigabitEthernet0/0/0]quit
[AR2]int g0/0/1
[AR2-GigabitEthernet0/0/1]isis enable 1
[AR2-GigabitEthernet0/0/1]quit
3.路由器AR3配置：
[AR3]int g0/0/1
[AR3-GigabitEthernet0/0/1]ip add 192.168.3.2 24
[AR3-GigabitEthernet0/0/1]quit
[AR3]int g0/0/0
[AR3-GigabitEthernet0/0/0]ip add 192.168.4.1 24
[AR3-GigabitEthernet0/0/0]quit[AR3]ospf router-id 3.3.3.3
[AR3-ospf-1]area 0
[AR3-ospf-1-area-0.0.0.0]network 192.168.3.0 0.0.0.255
[AR3-ospf-1-area-0.0.0.0]quit[AR3]isis
[AR3-isis-1]network-entity 49.0001.0000.0000.0003.00
[AR3-isis-1]is-level level-2
[AR3-isis-1]quit
[AR3]int g0/0/1
[AR3-GigabitEthernet0/0/1]ospf enable 1 area 0
[AR3-GigabitEthernet0/0/1]quit
[AR3]int g0/0/0
[AR3-GigabitEthernet0/0/0]isis enable 1
[AR3-GigabitEthernet0/0/0]quit
4.路由器AR4的配置：
[AR4]int g0/0/1
[AR4-GigabitEthernet0/0/1]ip add 192.168.2.2 24
[AR4-GigabitEthernet0/0/1]quit
[AR4]int g0/0/0
[AR4-GigabitEthernet0/0/0]ip add 192.168.4.2 24
[AR4-GigabitEthernet0/0/0]quit
[AR4]int LoopBack 0
[AR4-LoopBack0]ip add 7.7.7.7 32
[AR4-LoopBack0]quit//配置ISIS
[AR4]isis
[AR4-isis-1]network-entity 49.0001.0000.0000.0004.00
[AR4-isis-1]is-level level-2
[AR4-isis-1]quit
[AR4]int g0/0/1
[AR4-GigabitEthernet0/0/1]isis enable 1
[AR4-GigabitEthernet0/0/1]quit
[AR4]int g0/0/0
[AR4-GigabitEthernet0/0/0]isis enable 1
[AR4-GigabitEthernet0/0/0]
[AR4-GigabitEthernet0/0/0]quit
5.在AR2上查看路由表
发现从OSPF学到了6.6.6.6，在ISIS学到了7.7.7.7
二.路由引入
在路由器AR2上，引入ISIS路由
在AR1路由器查看路由表
发现了引入了三条路由（O_ASE），引入成功
